diff options
Diffstat (limited to 'lib/stdlib')
| -rw-r--r-- | lib/stdlib/doc/src/Makefile | 3 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/gen_fsm.xml | 14 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/gen_server.xml | 1 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/gen_statem.xml | 1715 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/proc_lib.xml | 6 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/ref_man.xml | 3 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/specs.xml | 1 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/supervisor.xml | 8 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/sys.xml | 29 | ||||
| -rw-r--r-- | lib/stdlib/src/Makefile | 3 | ||||
| -rw-r--r-- | lib/stdlib/src/gen.erl | 119 | ||||
| -rw-r--r-- | lib/stdlib/src/gen_event.erl | 9 | ||||
| -rw-r--r-- | lib/stdlib/src/gen_fsm.erl | 83 | ||||
| -rw-r--r-- | lib/stdlib/src/gen_server.erl | 110 | ||||
| -rw-r--r-- | lib/stdlib/src/gen_statem.erl | 1257 | ||||
| -rw-r--r-- | lib/stdlib/src/proc_lib.erl | 14 | ||||
| -rw-r--r-- | lib/stdlib/src/stdlib.app.src | 1 | ||||
| -rw-r--r-- | lib/stdlib/test/Makefile | 1 | ||||
| -rw-r--r-- | lib/stdlib/test/error_logger_forwarder.erl | 6 | ||||
| -rw-r--r-- | lib/stdlib/test/gen_statem_SUITE.erl | 1578 |
20 files changed, 4729 insertions, 232 deletions
diff --git a/lib/stdlib/doc/src/Makefile b/lib/stdlib/doc/src/Makefile index 196c86748f..26602764a6 100644 --- a/lib/stdlib/doc/src/Makefile +++ b/lib/stdlib/doc/src/Makefile @@ -1,7 +1,7 @@ # # %CopyrightBegin% # -# Copyright Ericsson AB 1997-2015. All Rights Reserved. +# Copyright Ericsson AB 1997-2016. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -68,6 +68,7 @@ XML_REF3_FILES = \ gen_event.xml \ gen_fsm.xml \ gen_server.xml \ + gen_statem.xml \ io.xml \ io_lib.xml \ lib.xml \ diff --git a/lib/stdlib/doc/src/gen_fsm.xml b/lib/stdlib/doc/src/gen_fsm.xml index 37e7c6ed17..835e252704 100644 --- a/lib/stdlib/doc/src/gen_fsm.xml +++ b/lib/stdlib/doc/src/gen_fsm.xml @@ -31,12 +31,23 @@ <module>gen_fsm</module> <modulesummary>Generic Finite State Machine Behaviour</modulesummary> <description> + <note> + <p> + There is a new behaviour + <seealso marker="gen_statem"><c>gen_statem</c></seealso> + that is intended to replace <c>gen_fsm</c> for new code. + It has the same features and add some really useful. + This module will not be removed for the foreseeable future + to keep old state machine implementations running. + </p> + </note> <p>A behaviour module for implementing a finite state machine. A generic finite state machine process (gen_fsm) implemented using this module will have a standard set of interface functions and include functionality for tracing and error reporting. It will also fit into an OTP supervision tree. Refer to - <seealso marker="doc/design_principles:fsm">OTP Design Principles</seealso> for more information.</p> + <seealso marker="doc/design_principles:fsm">OTP Design Principles</seealso> for more information. + </p> <p>A gen_fsm assumes all specific parts to be located in a callback module exporting a pre-defined set of functions. The relationship between the behaviour functions and the callback functions can be @@ -848,6 +859,7 @@ gen_fsm:sync_send_all_state_event -----> Module:handle_sync_event/4 <title>SEE ALSO</title> <p><seealso marker="gen_event">gen_event(3)</seealso>, <seealso marker="gen_server">gen_server(3)</seealso>, + <seealso marker="gen_statem">gen_statem(3)</seealso>, <seealso marker="supervisor">supervisor(3)</seealso>, <seealso marker="proc_lib">proc_lib(3)</seealso>, <seealso marker="sys">sys(3)</seealso></p> diff --git a/lib/stdlib/doc/src/gen_server.xml b/lib/stdlib/doc/src/gen_server.xml index 02da11250a..10dc978afc 100644 --- a/lib/stdlib/doc/src/gen_server.xml +++ b/lib/stdlib/doc/src/gen_server.xml @@ -715,6 +715,7 @@ gen_server:abcast -----> Module:handle_cast/2 <title>SEE ALSO</title> <p><seealso marker="gen_event">gen_event(3)</seealso>, <seealso marker="gen_fsm">gen_fsm(3)</seealso>, + <seealso marker="gen_statem">gen_statem(3)</seealso>, <seealso marker="supervisor">supervisor(3)</seealso>, <seealso marker="proc_lib">proc_lib(3)</seealso>, <seealso marker="sys">sys(3)</seealso></p> diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml new file mode 100644 index 0000000000..91332fbdde --- /dev/null +++ b/lib/stdlib/doc/src/gen_statem.xml @@ -0,0 +1,1715 @@ +<?xml version="1.0" encoding="utf-8" ?> +<!DOCTYPE erlref SYSTEM "erlref.dtd"> + +<erlref> + <header> + <copyright> + <year>2016</year> + <holder>Ericsson AB. All Rights Reserved.</holder> + </copyright> + <legalnotice> + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + + </legalnotice> + + <title>gen_statem</title> + <prepared></prepared> + <docno></docno> + <date></date> + <rev></rev> + </header> + <module>gen_statem</module> + <modulesummary>Generic State Machine Behaviour</modulesummary> + <description> + <p> + A behaviour module for implementing a state machine. Two + <seealso marker="#type-callback_mode"><em>callback modes</em></seealso> + are supported. One for finite state machines + (<seealso marker="gen_fsm"><c>gen_fsm</c></seealso> like) + that requires the state to be an atom and uses that state as + the name of the current callback function, + and one without restriction on the state data type + that uses one callback function for all states. + </p> + <p> + This is a new behaviour in OTP-19.0. + It has been thoroughly reviewed, is stable enough + to be used by at least two heavy OTP applications, and is here to stay. + But depending on user feedback, we do not expect + but might find it necessary to make minor + not backwards compatible changes into OTP-20.0, + so its state can be designated as "not quite experimental"... + </p> + <p> + The <c>gen_statem</c> behaviour is intended to replace + <seealso marker="gen_fsm"><c>gen_fsm</c></seealso> for new code. + It has the same features and add some really useful: + </p> + <list type="bulleted"> + <item>State code is gathered</item> + <item>The state can be any term</item> + <item>Events can be postponed</item> + <item>Events can be self generated</item> + <item>A reply can be sent from a later state</item> + <item>There can be multiple sys traceable replies</item> + </list> + <p> + The callback model(s) for <c>gen_statem</c> differs from + the one for <seealso marker="gen_fsm"><c>gen_fsm</c></seealso>, + but it is still fairly easy to rewrite + from <c>gen_fsm</c> to <c>gen_statem</c>. + </p> + <p> + A generic state machine process (<c>gen_statem</c>) implemented + using this module will have a standard set of interface functions + and include functionality for tracing and error reporting. + It will also fit into an OTP supervision tree. Refer to + <seealso marker="doc/design_principles:statem"> + OTP Design Principles + </seealso> + for more information. + </p> + <p> + A <c>gen_statem</c> assumes all specific parts to be located in a + callback module exporting a pre-defined set of functions. + The relationship between the behaviour functions and the callback + functions can be illustrated as follows:</p> + <pre> +gen_statem module Callback module +----------------- --------------- +gen_statem:start +gen_statem:start_link -----> Module:init/1 + +gen_statem:stop -----> Module:terminate/3 + +gen_statem:call +gen_statem:cast +erlang:send +erlang:'!' -----> Module:StateName/3 + Module:handle_event/4 + +- -----> Module:terminate/3 + +- -----> Module:code_change/4</pre> + <p> + Events are of different + <seealso marker="#type-event_type">types</seealso> + so the callback functions can know the origin of an event + and how to respond. + </p> + <p> + If a callback function fails or returns a bad value, + the <c>gen_statem</c> will terminate. An exception of class + <seealso marker="erts:erlang#throw/1"><c>throw</c></seealso>, + however, is not regarded as an error but as a valid return. + </p> + <marker id="state_function" /> + <p> + The "<em>state function</em>" for a specific + <seealso marker="#type-state">state</seealso> + in a <c>gen_statem</c> is the callback function that is called + for all events in this state, and is selected depending on which + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + that the implementation specifies when the the server starts. + </p> + <p> + When the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>state_functions</c>, the state has to be an atom and + is used as the state function name. See + <seealso marker="#Module:StateName/3"> + <c>Module:StateName/3</c> + </seealso>. + This gathers all code for a specific state + in one function and hence dispatches on state first. + Note that in this mode the fact that there is + a mandatory callback function + <seealso marker="#Module:terminate/3"> + <c>Module:terminate/3</c> + </seealso> makes the state name <c>terminate</c> unusable. + </p> + <p> + When the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>handle_event_function</c> the state can be any term + and the state function name is + <seealso marker="#Module:handle_event/4"> + <c>Module:handle_event/4</c> + </seealso>. + This makes it easy to dispatch on state or on event as you desire. + Be careful about which events you handle in which + states so you do not accidentally postpone one event + forever creating an infinite busy loop. + </p> + <p> + The <c>gen_statem</c> enqueues incoming events in order of arrival + and presents these to the + <seealso marker="#state_function">state function</seealso> + in that order. The state function can postpone an event + so it is not retried in the current state. + After a state change the queue restarts with the postponed events. + </p> + <p> + The <c>gen_statem</c> event queue model is sufficient + to emulate the normal process message queue with selective receive. + Postponing an event corresponds to not matching it + in a receive statement and changing states corresponds + to entering a new receive statement. + </p> + <p> + The <seealso marker="#state_function">state function</seealso> + can insert events using the + <seealso marker="#type-action"> + <c>action()</c> <c>next_event</c> + </seealso> + and such an event is inserted as the next to present + to the state function. That is: as if it is + the oldest incoming event. There is a dedicated + <seealso marker="#type-event_type"> + <c>event_type()</c> + </seealso> + <c>internal</c> that can be used for such events making them impossible + to mistake for external events. + </p> + <p> + Inserting an event replaces the trick of calling your own + state handling functions that you often would have to + resort to in for example <seealso marker="gen_fsm"><c>gen_fsm</c></seealso> + to force processing an inserted event before others. + A warning, though: if you in <c>gen_statem</c> for example + postpone an event in one state and then call some other state function of yours, + you have not changed states and hence the postponed event will not be retried, + which is logical but might be confusing. + </p> + <p> + See the type + <seealso marker="#type-transition_option"> + <c>transition_option()</c> + </seealso> + for the details of a state transition. + </p> + <p> + A <c>gen_statem</c> handles system messages as documented in + <seealso marker="sys"><c>sys</c></seealso>. + The <c>sys</c>module can be used for debugging a <c>gen_statem</c>. + </p> + <p> + Note that a <c>gen_statem</c> does not trap exit signals + automatically, this must be explicitly initiated in + the callback module (by calling + <seealso marker="erts:erlang#process_flag/2"> + <c>process_flag(trap_exit, true)</c></seealso>. + </p> + <p> + Unless otherwise stated, all functions in this module fail if + the specified <c>gen_statem</c> does not exist or + if bad arguments are given. + </p> + <p> + The <c>gen_statem</c> process can go into hibernation (see + <seealso marker="erts:erlang#hibernate/3"> + <c>erlang:hibernate/3</c> + </seealso>) if a + <seealso marker="#state_function">state function</seealso> or + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + specifies <c>hibernate</c> in the returned + <seealso marker="#type-action"><c>Actions</c></seealso> + list. This might be useful if the server is expected to be idle + for a long time. However use this feature with care + since hibernation implies at least two garbage collections + (when hibernating and shortly after waking up) and that is not + something you would want to do between each event on a busy server. + </p> + </description> + + <section> + <title>EXAMPLE</title> + <p> + This example shows a simple pushbutton model + for a toggling pushbutton implemented with + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + <c>state_functions</c>. + You can push the button and it replies if it went on or off, + and you can ask for a count of how many times it has been + pushed to on. + </p> + <p>This is the complete callback module file <c>pushbutton.erl</c>:</p> + <code type="erl"> +-module(pushbutton). +-behaviour(gen_statem). + +-export([start/0,push/0,get_count/0,stop/0]). +-export([terminate/3,code_change/4,init/1]). +-export([on/3,off/3]). + +name() -> pushbutton_statem. % The registered server name +callback_mode() -> state_functions. + +%% API. This example uses a registered name name() +%% and does not link to the caller. +start() -> + gen_statem:start({local,name()}, ?MODULE, [], []). +push() -> + gen_statem:call(name(), push). +get_count() -> + gen_statem:call(name(), get_count). +stop() -> + gen_statem:stop(name()). + +%% Mandatory callback functions +terminate(_Reason, _State, _Data) -> + void. +code_change(_Vsn, State, Data, _Extra) -> + {callback_mode(),State,Data}. +init([]) -> + %% Set the callback mode and initial state + data. + %% Data is used only as a counter. + State = off, Data = 0, + {callback_mode(),State,Data}. + + +%%% State functions + +off({call,From}, push, Data) -> + %% Go to 'on', increment count and reply + %% that the resulting status is 'on' + {next_state,on,Data+1,[{reply,From,on}]}; +off(EventType, EventContent, Data) -> + handle_event(EventType, EventContent, Data). + +on({call,From}, push, Data) -> + %% Go to 'off' and reply that the resulting status is 'off' + {next_state,off,Data,[{reply,From,off}]}; +on(EventType, EventContent, Data) -> + handle_event(EventType, EventContent, Data). + +%% Handle events common to all states +handle_event({call,From}, get_count, Data) -> + %% Reply with the current count + {keep_state,Data,[{reply,From,Data}]}; +handle_event(_, _, Data) -> + %% Ignore all other events + {keep_state,Data}. + </code> + <p>And this is a shell session when running it:</p> + <pre> +1> pushbutton:start(). +{ok,<0.36.0>} +2> pushbutton:get_count(). +0 +3> pushbutton:push(). +on +4> pushbutton:get_count(). +1 +5> pushbutton:push(). +off +6> pushbutton:get_count(). +1 +7> pushbutton:stop(). +ok +8> pushbutton:push(). +** exception exit: {noproc,{gen_statem,call,[pushbutton_statem,push,infinity]}} + in function gen:do_for_proc/2 (gen.erl, line 261) + in call from gen_statem:call/3 (gen_statem.erl, line 386) + </pre> + + <p> + And just to compare styles here is the same example using + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + <c>state_functions</c>, or rather here is code to replace + from the <c>init/1</c> function of the <c>pushbutton.erl</c> + example file above: + </p> + <code type="erl"> +init([]) -> + %% Set the callback mode and initial state + data. + %% Data is used only as a counter. + State = off, Data = 0, + {handle_event_function,State,Data}. + + +%%% Event handling + +handle_event({call,From}, push, off, Data) -> + %% Go to 'on', increment count and reply + %% that the resulting status is 'on' + {next_state,on,Data+1,[{reply,From,on}]}; +handle_event({call,From}, push, on, Data) -> + %% Go to 'off' and reply that the resulting status is 'off' + {next_state,off,Data,[{reply,From,off}]}; +%% +%% Event handling common to all states +handle_event({call,From}, get_count, State, Data) -> + %% Reply with the current count + {next_state,State,Data,[{reply,From,Data}]}; +handle_event(_, _, State, Data) -> + %% Ignore all other events + {next_state,State,Data}. + </code> + </section> + + <datatypes> + <datatype> + <name name="server_name" /> + <desc> + <p> + Name specification to use when starting + a <c>gen_statem</c> server. See + <seealso marker="#start_link/3"> + <c>start_link/3</c> + </seealso> + and + <seealso marker="#type-server_ref"> + <c>server_ref()</c> + </seealso> below. + </p> + </desc> + </datatype> + <datatype> + <name name="server_ref" /> + <desc> + <p> + Server specification to use when addressing + a <c>gen_statem</c> server. + See <seealso marker="#call/2"><c>call/2</c></seealso> and + <seealso marker="#type-server_name"> + <c>server_name()</c> + </seealso> + above. + </p> + <p>It can be:</p> + <taglist> + <tag><c>pid()</c><br /> + <c>LocalName</c></tag> + <item>The <c>gen_statem</c> is locally registered.</item> + <tag><c>Name, Node</c></tag> + <item> + The <c>gen_statem</c> is locally registered + on another node. + </item> + <tag><c>GlobalName</c></tag> + <item> + The <c>gen_statem</c> is globally registered + in <seealso marker="kernel:global"><c>global</c></seealso>. + </item> + <tag><c>RegMod, ViaName</c></tag> + <item> + The <c>gen_statem</c> is registered through + an alternative process registry. + The registry callback module <c>RegMod</c> + should export the functions + <c>register_name/2</c>, <c>unregister_name/1</c>, + <c>whereis_name/1</c> and <c>send/2</c>, + which should behave like the corresponding functions + in <seealso marker="kernel:global"><c>global</c></seealso>. + Thus, <c>{via,global,GlobalName}</c> is the same as + <c>{global,GlobalName}</c>. + </item> + </taglist> + </desc> + </datatype> + <datatype> + <name name="debug_opt" /> + <desc> + <p> + Debug option that can be used when starting + a <c>gen_statem</c> server through for example + <seealso marker="#enter_loop/5"><c>enter_loop/5</c></seealso>. + </p> + <p> + For every entry in <c><anno>Dbgs</anno></c> + the corresponding function in + <seealso marker="sys"><c>sys</c></seealso> will be called. + </p> + </desc> + </datatype> + <datatype> + <name name="start_opt" /> + <desc> + <p> + Options that can be used when starting + a <c>gen_statem</c> server through for example + <seealso marker="#start_link/3"><c>start_link/3</c></seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="start_ret" /> + <desc> + <p> + Return value from the start functions for_example + <seealso marker="#start_link/3"><c>start_link/3</c></seealso>. + </p> + </desc> + </datatype> + + <datatype> + <name name="from" /> + <desc> + <p> + Destination to use when replying through for example the + <seealso marker="#type-action"> + <c>action()</c> + </seealso> + <c>{reply,From,Reply}</c> + to a process that has called the <c>gen_statem</c> server using + <seealso marker="#call/2"><c>call/2</c></seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="state" /> + <desc> + <p> + After a state change (<c>NextState =/= State</c>) + all postponed events are retried. + </p> + </desc> + </datatype> + <datatype> + <name name="state_name" /> + <desc> + <p> + If the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>state_functions</c>, + the state has to be of this type. + </p> + </desc> + </datatype> + <datatype> + <name name="data" /> + <desc> + <p> + A term in which the state machine implementation + should store any server data it needs. The difference between + this and the <seealso marker="#type-state"><c>state()</c></seealso> + itself is that a change in this data does not cause + postponed events to be retried. Hence if a change + in this data would change the set of events that + are handled than that data item should be made + a part of the state. + </p> + </desc> + </datatype> + <datatype> + <name name="event_type" /> + <desc> + <p> + External events are of 3 different type: + <c>{call,<anno>From</anno>}</c>, <c>cast</c> or <c>info</c>. + <seealso marker="#call/2">Calls</seealso> + (synchronous) and + <seealso marker="#cast/2">casts</seealso> + originate from the corresponding API functions. + For calls the event contain whom to reply to. + Type <c>info</c> originates from regular process messages sent + to the <c>gen_statem</c>. It is also possible for the state machine + implementation to generate events of types + <c>timeout</c> and <c>internal</c> to itself. + </p> + </desc> + </datatype> + <datatype> + <name name="callback_mode" /> + <desc> + <p> + The <em>callback mode</em> is selected when starting the + <c>gen_statem</c> using the return value from + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + or when calling + <seealso marker="#enter_loop/5"><c>enter_loop/5-7</c></seealso>, + and with the return value from + <seealso marker="#Module:code_change/4"> + <c>Module:code_change/4</c>. + </seealso> + </p> + <taglist> + <tag><c>state_functions</c></tag> + <item> + The state has to be of type + <seealso marker="#type-state_name"><c>state_name()</c></seealso> + and one callback function per state that is + <seealso marker="#Module:StateName/3"> + <c>Module:StateName/3</c> + </seealso> + is used. + </item> + <tag><c>handle_event_function</c></tag> + <item> + The state can be any term and the callback function + <seealso marker="#Module:handle_event/4"> + <c>Module:handle_event/4</c> + </seealso> + is used for all states. + </item> + </taglist> + </desc> + </datatype> + <datatype> + <name name="transition_option" /> + <desc> + <p> + Transition options may be set by + <seealso marker="#type-action">actions</seealso> + and they modify some details below in how + the state transition is done: + </p> + <list type="ordered"> + <item> + All + <seealso marker="#type-action">actions</seealso> + are processed in order of appearance. + </item> + <item> + If + <seealso marker="#type-postpone"> + <c>postpone()</c> + </seealso> + is <c>true</c> + the current event is postponed. + </item> + <item> + If the state changes the queue of incoming events + is reset to start with the oldest postponed. + </item> + <item> + All events stored with + <seealso marker="#type-action"> + <c>action()</c> + </seealso> + <c>next_event</c> + are inserted in the queue to be processed before + all other events. + </item> + <item> + If an + <seealso marker="#type-event_timeout"> + <c>event_timeout()</c> + </seealso> + is set through + <seealso marker="#type-action"> + <c>action()</c> + </seealso> + <c>timeout</c> + an event timer may be started or a timeout zero event + may be enqueued. + </item> + <item> + The (possibly new) + <seealso marker="#state_function">state function</seealso> + is called with the oldest enqueued event if there is any, + otherwise the <c>gen_statem</c> goes into <c>receive</c> + or hibernation + (if + <seealso marker="#type-hibernate"> + <c>hibernate()</c> + </seealso> + is <c>true</c>) + to wait for the next message. In hibernation the next + non-system event awakens the <c>gen_statem</c>, or rather + the next incoming message awakens the <c>gen_statem</c> + but if it is a system event it goes back into hibernation. + </item> + </list> + </desc> + </datatype> + <datatype> + <name name="postpone" /> + <desc> + <p> + If <c>true</c> postpone the current event and retry + it when the state changes + (<c>NextState =/= State</c>). + </p> + </desc> + </datatype> + <datatype> + <name name="hibernate" /> + <desc> + <p> + If <c>true</c> hibernate the <c>gen_statem</c> + by calling + <seealso marker="proc_lib#hibernate/3"> + <c>proc_lib:hibernate/3</c> + </seealso> + before going into <c>receive</c> + to wait for a new external event. + If there are enqueued events the <c>hibernate</c> + is ignored as if an event just arrived and awakened + the <c>gen_statem</c>. + </p> + </desc> + </datatype> + <datatype> + <name name="event_timeout" /> + <desc> + <p> + Generate an event of + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>timeout</c> + after this time (in milliseconds) unless some other + event arrives in which case this timeout is cancelled. + Note that a retried or inserted event + counts just like a new in this respect. + </p> + <p> + If the value is <c>infinity</c> no timer is started since + it will never trigger anyway. + </p> + <p> + If the value is <c>0</c> the timeout event is immediately enqueued + unless there already are enqueued events since then the + timeout is immediately cancelled. + This is a feature ensuring that a timeout <c>0</c> event + will be processed before any not yet received external event. + </p> + <p> + Note that it is not possible nor needed to cancel this timeout + since it is cancelled automatically by any other event. + </p> + </desc> + </datatype> + <datatype> + <name name="action" /> + <desc> + <p> + These state transition actions may be invoked by + returning them from the + <seealso marker="#state_function">state function</seealso>, + from <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + or by giving them to + <seealso marker="#enter_loop/6"><c>enter_loop/6,7</c></seealso>. + </p> + <p> + Actions are executed in the containing list order. + </p> + <p> + Actions that set + <seealso marker="#type-transition_option"> + transition options + </seealso> + overrides any previous of the same type, + so the last in the containing list wins. + For example the last + <seealso marker="#type-event_timeout"> + <c>event_timeout()</c> + </seealso> + overrides any other <c>event_timeout()</c> in the list. + </p> + <taglist> + <tag><c>postpone</c></tag> + <item> + Set the + <seealso marker="#type-transition_option"> + <c>transition_option()</c> + </seealso> + <seealso marker="#type-postpone"> + <c>postpone()</c> + </seealso> + for this state transition. + This action is ignored when returned from + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + or given to + <seealso marker="#enter_loop/5"><c>enter_loop/5,6</c></seealso> + since there is no event to postpone in those cases. + </item> + <tag><c>hibernate</c></tag> + <item> + Set the + <seealso marker="#type-transition_option"> + <c>transition_option()</c> + </seealso> + <seealso marker="#type-hibernate"> + <c>hibernate()</c> + </seealso> + for this state transition. + </item> + <tag><c>Timeout</c></tag> + <item> + Short for <c>{timeout,Timeout,Timeout}</c> that is + the timeout message is the timeout time. + This form exists to make the + <seealso marker="#state_function">state function</seealso> + return value <c>{next_state,NextState,NewData,Timeout}</c> + allowed like for + <seealso marker="gen_fsm#Module:StateName/2"> + <c>gen_fsm Module:StateName/2</c>. + </seealso> + </item> + <tag><c>timeout</c></tag> + <item> + Set the + <seealso marker="#type-transition_option"> + <c>transition_option()</c> + </seealso> + <seealso marker="#type-event_timeout"> + <c>event_timeout()</c> + </seealso> + to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>. + </item> + <tag><c>reply_action()</c></tag> + <item>Reply to a caller.</item> + <tag><c>next_event</c></tag> + <item> + Store the given <c><anno>EventType</anno></c> + and <c><anno>EventContent</anno></c> for insertion after all + actions have been executed. + </item> + <item> + <p> + The stored events are inserted in the queue as the next to process + before any already queued events. The order of these stored events + is preserved so the first <c>next_event</c> in the containing list + will become the first to process. + </p> + </item> + <item> + <p> + An event of type + <seealso marker="#type-event_type"> + <c>internal</c> + </seealso> + should be used when you want to reliably distinguish + an event inserted this way from any external event. + </p> + </item> + </taglist> + </desc> + </datatype> + <datatype> + <name name="reply_action" /> + <desc> + <p> + Reply to a caller waiting for a reply in + <seealso marker="#call/2"><c>call/2</c></seealso>. + <c><anno>From</anno></c> must be the term from the + <seealso marker="#type-event_type"> + <c>{call,<anno>From</anno>}</c> + </seealso> + argument to the + <seealso marker="#state_function">state function</seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="state_function_result" /> + <desc> + <taglist> + <tag><c>next_state</c></tag> + <item> + The <c>gen_statem</c> will do a state transition to + <c><anno>NextStateName</anno></c> + (which may be the same as the current state), + set <c><anno>NewData</anno></c> + and execute all <c><anno>Actions</anno></c> + </item> + </taglist> + <p> + All these terms are tuples or atoms and this property + will hold in any future version of <c>gen_statem</c>, + just in case you need such a promise. + </p> + </desc> + </datatype> + <datatype> + <name name="handle_event_result" /> + <desc> + <taglist> + <tag><c>next_state</c></tag> + <item> + The <c>gen_statem</c> will do a state transition to + <c><anno>NextState</anno></c> + (which may be the same as the current state), + set <c><anno>NewData</anno></c> + and execute all <c><anno>Actions</anno></c> + </item> + </taglist> + <p> + All these terms are tuples or atoms and this property + will hold in any future version of <c>gen_statem</c>, + just in case you need such a promise. + </p> + </desc> + </datatype> + <datatype> + <name name="common_state_callback_result" /> + <desc> + <taglist> + <tag><c>stop</c></tag> + <item> + Terminate the <c>gen_statem</c> by calling + <seealso marker="#Module:terminate/3"> + <c>Module:terminate/3</c> + </seealso> + with <c>Reason</c> and + <c><anno>NewData</anno></c>, if given. + </item> + <tag><c>stop_and_reply</c></tag> + <item> + Send all <c><anno>Replies</anno></c> + then terminate the <c>gen_statem</c> by calling + <seealso marker="#Module:terminate/3"> + <c>Module:terminate/3</c> + </seealso> + with <c>Reason</c> and + <c><anno>NewData</anno></c>, if given. + </item> + <tag><c>keep_state</c></tag> + <item> + The <c>gen_statem</c> will keep the current state, or + do a state transition to the current state if you like, + set <c><anno>NewData</anno></c> + and execute all <c><anno>Actions</anno></c>. + This is the same as + <c>{next_state,CurrentState,<anno>NewData</anno>,<anno>Actions</anno>}</c>. + </item> + <tag><c>keep_state_and_data</c></tag> + <item> + The <c>gen_statem</c> will keep the current state or + do a state transition to the current state if you like, + keep the current server data, + and execute all <c><anno>Actions</anno></c>. + This is the same as + <c>{next_state,CurrentState,CurrentData,<anno>Actions</anno>}</c>. + </item> + </taglist> + <p> + All these terms are tuples or atoms and this property + will hold in any future version of <c>gen_statem</c>, + just in case you need such a promise. + </p> + </desc> + </datatype> + </datatypes> + + <funcs> + + <func> + <name name="start_link" arity="3" /> + <name name="start_link" arity="4" /> + <fsummary>Create a linked <c>gen_statem</c> process</fsummary> + <desc> + <p> + Creates a <c>gen_statem</c> process according + to OTP design principles + (using + <seealso marker="proc_lib"><c>proc_lib</c></seealso> + primitives) + that is linked to the calling process. + This is essential when the <c>gen_statem</c> shall be part of + a supervision tree so it gets linked to its supervisor. + </p> + <p> + The <c>gen_statem</c> process calls + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + to initialize the server. To ensure a synchronized start-up + procedure, <c>start_link/3,4</c> does not return until + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + has returned. + </p> + <p> + <c><anno>ServerName</anno></c> specifies the + <seealso marker="#type-server_name"> + <c>server_name()</c> + </seealso> + to register for the <c>gen_statem</c>. + If the <c>gen_statem</c> is started with <c>start_link/3</c> + no <c><anno>ServerName</anno></c> is provided and + the <c>gen_statem</c> is not registered. + </p> + <p><c><anno>Module</anno></c> is the name of the callback module.</p> + <p> + <c><anno>Args</anno></c> is an arbitrary term which is passed as + the argument to + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso>. + </p> + <p> + If the option <c>{timeout,Time}</c> is present in + <c><anno>Opts</anno></c>, the <c>gen_statem</c> + is allowed to spend <c>Time</c> milliseconds initializing + or it will be terminated and the start function will return + <seealso marker="#type-start_ret"><c>{error,timeout}</c></seealso>. + </p> + <p> + If the option + <seealso marker="#type-debug_opt"><c>{debug,Dbgs}</c></seealso> + is present in <c><anno>Opts</anno></c>, debugging through + <seealso marker="sys"><c>sys</c></seealso> is activated. + </p> + <p> + If the option <c>{spawn_opt,SpawnOpts}</c> is present in + <c><anno>Opts</anno></c>, <c>SpawnOpts</c> will be passed + as option list to + <seealso marker="erts:erlang#spawn_opt/2"><c>spawn_opt/2</c></seealso> + which is used to spawn the <c>gen_statem</c> process. + </p> + <note> + <p> + Using the spawn option <c>monitor</c> is currently not + allowed, but will cause this function to fail with reason + <c>badarg</c>. + </p> + </note> + <p> + If the <c>gen_statem</c> is successfully created + and initialized this function returns + <seealso marker="#type-start_ret"> + <c>{ok,Pid}</c>, + </seealso> + where <c>Pid</c> is the <c>pid()</c> + of the <c>gen_statem</c>. + If there already exists a process with the specified + <c><anno>ServerName</anno></c> this function returns + <seealso marker="#type-start_ret"><c>{error,{already_started,Pid}}</c></seealso>, + where <c>Pid</c> is the <c>pid()</c> of that process. + </p> + <p> + If <c>Module:init/1</c> fails with <c>Reason</c>, + this function returns + <seealso marker="#type-start_ret"><c>{error,Reason}</c></seealso>. + If <c>Module:init/1</c> returns + <seealso marker="#type-start_ret"> + <c>{stop,Reason}</c> + </seealso> + or + <seealso marker="#type-start_ret"><c>ignore</c></seealso>, + the process is terminated and this function + returns + <seealso marker="#type-start_ret"> + <c>{error,Reason}</c> + </seealso> + or + <seealso marker="#type-start_ret"><c>ignore</c></seealso>, + respectively. + </p> + </desc> + </func> + + + <func> + <name name="start" arity="3" /> + <name name="start" arity="4" /> + <fsummary>Create a stand-alone <c>gen_statem</c> process</fsummary> + <desc> + <p> + Creates a stand-alone <c>gen_statem</c> process according to + OTP design principles (using + <seealso marker="proc_lib"><c>proc_lib</c></seealso> + primitives). + Since it does not get linked to the calling process + this start function can not be used by a supervisor + to start a child. + </p> + <p> + See <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso> + for a description of arguments and return values. + </p> + </desc> + </func> + + <func> + <name name="stop" arity="1" /> + <fsummary>Synchronously stop a generic server</fsummary> + <desc> + <p> + The same as + <seealso marker="#stop/3"> + <c>stop(<anno>ServerRef</anno>, normal, infinity)</c>. + </seealso> + </p> + </desc> + </func> + <func> + <name name="stop" arity="3" /> + <fsummary>Synchronously stop a generic server</fsummary> + <desc> + <p> + Orders the <c>gen_statem</c> + <seealso marker="#type-server_ref"> + <c><anno>ServerRef</anno></c> + </seealso> + to exit with the given <c><anno>Reason</anno></c> + and waits for it to terminate. + The <c>gen_statem</c> will call + <seealso marker="#Module:terminate/3"> + <c>Module:terminate/3</c> + </seealso> + before exiting. + </p> + <p> + This function returns <c>ok</c> if the server terminates + with the expected reason. Any other reason than <c>normal</c>, + <c>shutdown</c>, or <c>{shutdown,Term}</c> will cause an + error report to be issued through + <seealso marker="kernel:error_logger#format/2"> + <c>error_logger:format/2</c>. + </seealso> + The default <c><anno>Reason</anno></c> is <c>normal</c>. + </p> + <p> + <c><anno>Timeout</anno></c> is an integer greater than zero + which specifies how many milliseconds to wait for the server to + terminate, or the atom <c>infinity</c> to wait indefinitely. + The default value is <c>infinity</c>. + If the server has not terminated within the specified time, + a <c>timeout</c> exception is raised. + </p> + <p> + If the process does not exist, a <c>noproc</c> exception + is raised. + </p> + </desc> + </func> + + <func> + <name name="call" arity="2" /> + <name name="call" arity="3" /> + <fsummary>Make a synchronous call to a <c>gen_statem</c></fsummary> + <desc> + <p> + Makes a synchronous call to the <c>gen_statem</c> + <seealso marker="#type-server_ref"> + <c><anno>ServerRef</anno></c> + </seealso> + by sending a request + and waiting until its reply arrives. + The <c>gen_statem</c> will call the + <seealso marker="#state_function">state function</seealso> with + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>{call,From}</c> and event content + <c><anno>Request</anno></c>. + </p> + <p> + A <c><anno>Reply</anno></c> is generated when a + <seealso marker="#state_function">state function</seealso> + returns with + <c>{reply,From,<anno>Reply</anno>}</c> as one + <seealso marker="#type-action"><c>action()</c></seealso>, + and that <c><anno>Reply</anno></c> becomes the return value + of this function. + </p> + <p> + <c><anno>Timeout</anno></c> is an integer greater than zero + which specifies how many milliseconds to wait for a reply, + or the atom <c>infinity</c> to wait indefinitely, + which is the default. If no reply is received within + the specified time, the function call fails. + </p> + <note> + <p> + To avoid getting a late reply in the caller's + inbox this function spawns a proxy process that + does the call. A late reply gets delivered to the + dead proxy process hence gets discarded. This is + less efficient than using + <c><anno>Timeout</anno> =:= infinity</c>. + </p> + </note> + <p> + The call may fail for example if the <c>gen_statem</c> dies + before or during this function call. + </p> + </desc> + </func> + + <func> + <name name="cast" arity="2" /> + <fsummary>Send an asynchronous event to a <c>gen_statem</c></fsummary> + <desc> + <p> + Sends an asynchronous event to the <c>gen_statem</c> + <seealso marker="#type-server_ref"> + <c><anno>ServerRef</anno></c> + </seealso> + and returns <c>ok</c> immediately, + ignoring if the destination node or <c>gen_statem</c> + does not exist. + The <c>gen_statem</c> will call the + <seealso marker="#state_function">state function</seealso> with + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>cast</c> and event content + <c><anno>Msg</anno></c>. + </p> + </desc> + </func> + + <func> + <name name="reply" arity="1" /> + <name name="reply" arity="2" /> + <fsummary>Reply to a caller</fsummary> + <desc> + <p> + This function can be used by a <c>gen_statem</c> + to explicitly send a reply to a process that waits in + <seealso marker="#call/2"><c>call/2</c></seealso> + when the reply cannot be defined in + the return value of a + <seealso marker="#state_function">state function</seealso>. + </p> + <p> + <c><anno>From</anno></c> must be the term from the + <seealso marker="#type-event_type"> + <c>{call,<anno>From</anno>}</c> + </seealso> + argument to the + <seealso marker="#state_function">state function</seealso>. + <c><anno>From</anno></c> and <c><anno>Reply</anno></c> + can also be specified using a + <seealso marker="#type-reply_action"> + <c>reply_action()</c> + </seealso> + and multiple replies with a list of them. + </p> + <note> + <p> + A reply sent with this function will not be visible + in <seealso marker="sys"><c>sys</c></seealso> debug output. + </p> + </note> + </desc> + </func> + + <func> + <name name="enter_loop" arity="5" /> + <fsummary>Enter the <c>gen_statem</c> receive loop</fsummary> + <desc> + <p> + The same as + <seealso marker="#enter_loop/7"><c>enter_loop/7</c></seealso> + except that no + <seealso marker="#type-server_name"> + <c>server_name()</c> + </seealso> + must have been registered. + </p> + </desc> + </func> + <func> + <name name="enter_loop" arity="6" /> + <fsummary>Enter the <c>gen_statem</c> receive loop</fsummary> + <desc> + <p> + If <c><anno>Server_or_Actions</anno></c> is a <c>list()</c> + the same as + <seealso marker="#enter_loop/7"><c>enter_loop/7</c></seealso> + except that no + <seealso marker="#type-server_name"> + <c>server_name()</c> + </seealso> + must have been registered and + <c>Actions = <anno>Server_or_Actions</anno></c>. + </p> + <p> + Otherwise the same as + <seealso marker="#enter_loop/7"><c>enter_loop/7</c></seealso> + with + <c>Server = <anno>Server_or_Actions</anno></c> and + <c>Actions = []</c>. + </p> + </desc> + </func> + <func> + <name name="enter_loop" arity="7" /> + <fsummary>Enter the <c>gen_statem</c> receive loop</fsummary> + <desc> + <p> + Makes an the calling process become a <c>gen_statem</c>. + Does not return, instead the calling process will enter + the <c>gen_statem</c> receive loop and become + a <c>gen_statem</c> server. + The process <em>must</em> have been started + using one of the start functions in + <seealso marker="proc_lib"><c>proc_lib</c></seealso>. + The user is responsible for any initialization of the process, + including registering a name for it. + </p> + <p> + This function is useful when a more complex initialization + procedure is needed than + the <c>gen_statem</c> behaviour provides. + </p> + <p> + <c><anno>Module</anno></c>, <c><anno>Opts</anno></c> and + <c><anno>Server</anno></c> have the same meanings + as when calling + <seealso marker="#start_link/3"> + <c>gen_statem:start[_link]/3,4</c>. + </seealso> + However, the + <seealso marker="#type-server_name"> + <c>server_name()</c> + </seealso> + name must have been registered accordingly + <em>before</em> this function is called.</p> + <p> + <c><anno>CallbackMode</anno></c>, <c><anno>State</anno></c>, + <c><anno>Data</anno></c> and <c><anno>Actions</anno></c> + have the same meanings as in the return value of + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso>. + Also, the callback module <c><anno>Module</anno></c> + does not need to export an <c>init/1</c> function. + </p> + <p> + Failure: If the calling process was not started by a + <seealso marker="proc_lib"><c>proc_lib</c></seealso> + start function, or if it is not registered + according to + <seealso marker="#type-server_name"><c>server_name()</c></seealso>. + </p> + </desc> + </func> + + </funcs> + + + + <section> + <title>CALLBACK FUNCTIONS</title> + <p> + The following functions should be exported from a + <c>gen_statem</c> callback module. + </p> + </section> + <funcs> + + <func> + <name>Module:init(Args) -> Result</name> + <fsummary>Initialize process and internal state</fsummary> + <type> + <v>Args = term()</v> + <v>Result = {CallbackMode,State,Data}</v> + <v> | {CallbackMode,State,Data,Actions}</v> + <v> | {stop,Reason} | ignore</v> + <v> + CallbackMode = + <seealso marker="#type-callback_mode">callback_mode()</seealso> + </v> + <v>State = <seealso marker="#type-state">state()</seealso></v> + <v> + Data = <seealso marker="#type-data">data()</seealso> + </v> + <v> + Actions = + [<seealso marker="#type-action">action()</seealso>] | + <seealso marker="#type-action">action()</seealso> + </v> + <v>Reason = term()</v> + </type> + <desc> + <marker id="Module:init-1" /> + <p> + Whenever a <c>gen_statem</c> is started using + <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso> + or + <seealso marker="#start/3"><c>start/3,4</c></seealso>, + this function is called by the new process to initialize + the implementation state and server data. + </p> + <p> + <c>Args</c> is the <c>Args</c> argument provided to the start + function. + </p> + <p> + If the initialization is successful, the function should + return <c>{CallbackMode,State,Data}</c> or + <c>{CallbackMode,State,Data,Actions}</c>. + <c>CallbackMode</c> selects the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso>. + of the <c>gen_statem</c>. + <c>State</c> is the initial + <seealso marker="#type-state"><c>state()</c></seealso> + and <c>Data</c> the initial server + <seealso marker="#type-data"><c>data()</c></seealso>. + </p> + <p> + The <seealso marker="#type-action"><c>Actions</c></seealso> + are executed when entering the first + <seealso marker="#type-state">state</seealso> just as for a + <seealso marker="#state_function">state function</seealso>. + </p> + <p> + If something goes wrong during the initialization + the function should return <c>{stop,Reason}</c> + or <c>ignore</c>. See + <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso>. + </p> + <p> + This function may use + <seealso marker="erts:erlang#throw/1"><c>throw/1</c></seealso> + to return <c>Result</c>. + </p> + </desc> + </func> + + <func> + <name>Module:StateName(EventType, EventContent, Data) -> + StateFunctionResult + </name> + <name>Module:handle_event(EventType, EventContent, + State, Data) -> HandleEventResult + </name> + <fsummary>Handle an event</fsummary> + <type> + <v> + EventType = + <seealso marker="#type-event_type">event_type()</seealso> + </v> + <v>EventContent = term()</v> + <v> + State = + <seealso marker="#type-state">state()</seealso> + </v> + <v> + Data = NewData = + <seealso marker="#type-data">data()</seealso> + </v> + <v> + StateFunctionResult = + <seealso marker="#type-state_function_result"> + state_function_result() + </seealso> + </v> + <v> + HandleEventResult = + <seealso marker="#type-handle_event_result"> + handle_event_result() + </seealso> + </v> + </type> + <desc> + <p> + Whenever a <c>gen_statem</c> receives an event from + <seealso marker="#call/2"><c>call/2</c></seealso>, + <seealso marker="#cast/2"><c>cast/2</c></seealso> or + as a normal process message one of these functions is called. If + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>state_functions</c> then <c>Module:StateName/3</c> is called, + and if it is <c>handle_event_function</c> + then <c>Module:handle_event/4</c> is called. + </p> + <p> + If <c>EventType</c> is + <seealso marker="#type-event_type"><c>{call,From}</c></seealso> + the caller is waiting for a reply. The reply can be sent + from this or from any other + <seealso marker="#state_function">state function</seealso> + by returning with <c>{reply,From,Reply}</c> in + <seealso marker="#type-action"><c>Actions</c></seealso>, in + <seealso marker="#type-reply_action"><c>Replies</c></seealso> + or by calling + <seealso marker="#reply/2"><c>reply(From, Reply)</c></seealso>. + </p> + <p> + If this function returns with a next state that + does not match equal (<c>=/=</c>) to the current state + all postponed events will be retried in the next state. + </p> + <p> + The only difference between <c>StateFunctionResult</c> and + <c>HandleEventResult</c> is that for <c>StateFunctionResult</c> + the next state has to be an atom but for <c>HandleEventResult</c> + there is no restriction on the next state. + </p> + <p> + See <seealso marker="#type-action"><c>action()</c></seealso> + for options that can be set and actions that can be done + by <c>gen_statem</c> after returning from this function. + </p> + <p> + These functions may use + <seealso marker="erts:erlang#throw/1"><c>throw/1</c></seealso>, + to return the result. + </p> + </desc> + </func> + + <func> + <name>Module:terminate(Reason, State, Data) -> Ignored</name> + <fsummary>Clean up before termination</fsummary> + <type> + <v>Reason = normal | shutdown | {shutdown,term()} | term()</v> + <v>State = <seealso marker="#type-state">state()</seealso></v> + <v>Data = <seealso marker="#type-data">data()</seealso></v> + <v>Ignored = term()</v> + </type> + <desc> + <p> + This function is called by a <c>gen_statem</c> + when it is about to terminate. It should be the opposite of + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + and do any necessary cleaning up. When it returns, + the <c>gen_statem</c> terminates with <c>Reason</c>. The return + value is ignored.</p> + <p> + <c>Reason</c> is a term denoting the stop reason and + <seealso marker="#type-state"><c>State</c></seealso> + is the internal state of the <c>gen_statem</c>. + </p> + <p> + <c>Reason</c> depends on why the <c>gen_statem</c> + is terminating. + If it is because another callback function has returned a + stop tuple <c>{stop,Reason}</c> in + <seealso marker="#type-action"><c>Actions</c></seealso>, + <c>Reason</c> will have the value specified in that tuple. + If it is due to a failure, <c>Reason</c> is the error reason. + </p> + <p> + If the <c>gen_statem</c> is part of a supervision tree and is + ordered by its supervisor to terminate, this function will be + called with <c>Reason = shutdown</c> if the following + conditions apply:</p> + <list type="bulleted"> + <item> + the <c>gen_statem</c> has been set + to trap exit signals, and + </item> + <item> + the shutdown strategy as defined in the supervisor's + child specification is an integer timeout value, not + <c>brutal_kill</c>. + </item> + </list> + <p> + Even if the <c>gen_statem</c> is <em>not</em> + part of a supervision tree, this function will be called + if it receives an <c>'EXIT'</c> message from its parent. + <c>Reason</c> will be the same as + in the <c>'EXIT'</c> message. + </p> + <p> + Otherwise, the <c>gen_statem</c> will be immediately terminated. + </p> + <p> + Note that for any other reason than <c>normal</c>, + <c>shutdown</c>, or <c>{shutdown,Term}</c> + the <c>gen_statem</c> is assumed to terminate due to an error + and an error report is issued using + <seealso marker="kernel:error_logger#format/2"> + <c>error_logger:format/2</c>. + </seealso> + </p> + <p> + This function may use + <seealso marker="erts:erlang#throw/1"><c>throw/1</c></seealso> + to return <c>Ignored</c>, which is ignored anyway. + </p> + </desc> + </func> + + <func> + <name>Module:code_change(OldVsn, OldState, OldData, Extra) -> + Result + </name> + <fsummary>Update the internal state during upgrade/downgrade</fsummary> + <type> + <v>OldVsn = Vsn | {down,Vsn}</v> + <v> Vsn = term()</v> + <v>OldState = NewState = term()</v> + <v>Extra = term()</v> + <v>Result = {NewCallbackMode,NewState,NewData} | Reason</v> + <v> + NewCallbackMode = + <seealso marker="#type-callback_mode">callback_mode()</seealso> + </v> + <v> + OldState = NewState = + <seealso marker="#type-state">state()</seealso> + </v> + <v> + OldData = NewData = + <seealso marker="#type-data">data()</seealso> + </v> + <v>Reason = term()</v> + </type> + <desc> + <p> + This function is called by a <c>gen_statem</c> when it should + update its internal state during a release upgrade/downgrade, + that is when the instruction <c>{update,Module,Change,...}</c> + where <c>Change={advanced,Extra}</c> is given in the + <seealso marker="sasl:appup"><c>appup</c></seealso> + file. See + <seealso marker="doc/design_principles:release_handling#instr"> + OTP Design Principles + </seealso> + for more information. + </p> + <p> + In the case of an upgrade, <c>OldVsn</c> is <c>Vsn</c>, and + in the case of a downgrade, <c>OldVsn</c> is + <c>{down,Vsn}</c>. <c>Vsn</c> is defined by the <c>vsn</c> + attribute(s) of the old version of the callback module + <c>Module</c>. If no such attribute is defined, the version + is the checksum of the BEAM file. + </p> + <note> + <p> + If you would dare to change + <seealso marker="#type-callback_mode"> + <em>callback mode</em> + </seealso> + during release upgrade/downgrade, the upgrade is no problem + since the new code surely knows what <em>callback mode</em> + it needs, but for a downgrade this function will have to + know from the <c>Extra</c> argument that comes from the + <seealso marker="sasl:appup"><c>appup</c></seealso> + file what <em>callback mode</em> the old code did use. + It may also be possible to figure this out + from the <c>{down,Vsn}</c> argument since <c>Vsn</c> + in effect defines the old callback module version. + </p> + </note> + <p> + <c>OldState</c> and <c>OldData</c> is the internal state + of the <c>gen_statem</c>. + </p> + <p> + <c>Extra</c> is passed as-is from the <c>{advanced,Extra}</c> + part of the update instruction. + </p> + <p> + If successful, the function shall return the updated + internal state in an + <c>{NewCallbackMode,NewState,NewData}</c> tuple. + </p> + <p> + If the function returns <c>Reason</c>, the ongoing + upgrade will fail and roll back to the old release.</p> + <p> + This function may use + <seealso marker="erts:erlang#throw/1"><c>throw/1</c></seealso> + to return <c>Result</c> or <c>Reason</c>. + </p> + </desc> + </func> + + <func> + <name>Module:format_status(Opt, [PDict,State,Data]) -> + Status + </name> + <fsummary>Optional function for providing a term describing the + current <c>gen_statem</c> status</fsummary> + <type> + <v>Opt = normal | terminate</v> + <v>PDict = [{Key, Value}]</v> + <v> + State = + <seealso marker="#type-state">state()</seealso> + </v> + <v> + Data = + <seealso marker="#type-data">data()</seealso> + </v> + <v>Key = term()</v> + <v>Value = term()</v> + <v>Status = term()</v> + </type> + <desc> + <note> + <p> + This callback is optional, so a callback module need not + export it. The <c>gen_statem</c> module provides a default + implementation of this function that returns + <c>{State,Data}</c>. If this callback fails the default + function will return <c>{State,Info}</c> + where <c>Info</c> informs of the crash but no details, + to hide possibly sensitive data. + </p> + </note> + <p>This function is called by a <c>gen_statem</c> process when:</p> + <list type="bulleted"> + <item> + One of + <seealso marker="sys#get_status/1"> + <c>sys:get_status/1,2</c> + </seealso> + is invoked to get the <c>gen_statem</c> status. <c>Opt</c> is set + to the atom <c>normal</c> for this case. + </item> + <item> + The <c>gen_statem</c> terminates abnormally and logs an error. + <c>Opt</c> is set to the atom <c>terminate</c> for this case. + </item> + </list> + <p> + This function is useful for customising the form and + appearance of the <c>gen_statem</c> status for these cases. A + callback module wishing to customise the + <seealso marker="sys#get_status/1"> + <c>sys:get_status/1,2</c> + </seealso> + return value as well as how + its status appears in termination error logs exports an + instance of <c>format_status/2</c> that returns a term + describing the current status of the <c>gen_statem</c>. + </p> + <p> + <c>PDict</c> is the current value of the <c>gen_statem</c>'s + process dictionary. + </p> + <p> + <seealso marker="#type-state"><c>State</c></seealso> + is the internal state of the <c>gen_statem</c>. + </p> + <p> + <seealso marker="#type-data"><c>Data</c></seealso> + is the internal server data of the <c>gen_statem</c>. + </p> + <p> + The function should return <c>Status</c>, a term that + customises the details of the current state and status of + the <c>gen_statem</c>. There are no restrictions on the + form <c>Status</c> can take, but for the + <seealso marker="sys#get_status/1"> + <c>sys:get_status/1,2</c> + </seealso> + case (when <c>Opt</c> + is <c>normal</c>), the recommended form for + the <c>Status</c> value is <c>[{data, [{"State", + Term}]}]</c> where <c>Term</c> provides relevant details of + the <c>gen_statem</c> state. Following this recommendation isn't + required, but doing so will make the callback module status + consistent with the rest of the + <seealso marker="sys#get_status/1"> + <c>sys:get_status/1,2</c> + </seealso> + return value. + </p> + <p> + One use for this function is to return compact alternative + state representations to avoid having large state terms + printed in logfiles. Another is to hide sensitive data from + being written to the error log. + </p> + <p> + This function may use + <seealso marker="erts:erlang#throw/1"><c>throw/1</c></seealso> + to return <c>Status</c>. + </p> + </desc> + </func> + + </funcs> + + <section> + <title>SEE ALSO</title> + <p><seealso marker="gen_event"><c>gen_event(3)</c></seealso>, + <seealso marker="gen_fsm"><c>gen_fsm(3)</c></seealso>, + <seealso marker="gen_server"><c>gen_server(3)</c></seealso>, + <seealso marker="supervisor"><c>supervisor(3)</c></seealso>, + <seealso marker="proc_lib"><c>proc_lib(3)</c></seealso>, + <seealso marker="sys"><c>sys(3)</c></seealso></p> + </section> +</erlref> diff --git a/lib/stdlib/doc/src/proc_lib.xml b/lib/stdlib/doc/src/proc_lib.xml index bef037076b..245580b1ba 100644 --- a/lib/stdlib/doc/src/proc_lib.xml +++ b/lib/stdlib/doc/src/proc_lib.xml @@ -34,9 +34,9 @@ <p>This module is used to start processes adhering to the <seealso marker="doc/design_principles:des_princ">OTP Design Principles</seealso>. Specifically, the functions in this module are used by the OTP standard behaviors (<c>gen_server</c>, - <c>gen_fsm</c>, ...) when starting new processes. The functions - can also be used to start <em>special processes</em>, user - defined processes which comply to the OTP design principles. See + <c>gen_fsm</c>, <c>gen_statem</c>, ...) when starting new processes. + The functions can also be used to start <em>special processes</em>, + user defined processes which comply to the OTP design principles. See <seealso marker="doc/design_principles:spec_proc">Sys and Proc_Lib</seealso> in OTP Design Principles for an example.</p> <p>Some useful information is initialized when a process starts. The registered names, or the process identifiers, of the parent diff --git a/lib/stdlib/doc/src/ref_man.xml b/lib/stdlib/doc/src/ref_man.xml index 82ad78e675..404873ea32 100644 --- a/lib/stdlib/doc/src/ref_man.xml +++ b/lib/stdlib/doc/src/ref_man.xml @@ -4,7 +4,7 @@ <application xmlns:xi="http://www.w3.org/2001/XInclude"> <header> <copyright> - <year>1996</year><year>2015</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -66,6 +66,7 @@ <xi:include href="gen_event.xml"/> <xi:include href="gen_fsm.xml"/> <xi:include href="gen_server.xml"/> + <xi:include href="gen_statem.xml"/> <xi:include href="io.xml"/> <xi:include href="io_lib.xml"/> <xi:include href="lib.xml"/> diff --git a/lib/stdlib/doc/src/specs.xml b/lib/stdlib/doc/src/specs.xml index 0418bf7b22..45b207b13d 100644 --- a/lib/stdlib/doc/src/specs.xml +++ b/lib/stdlib/doc/src/specs.xml @@ -30,6 +30,7 @@ <xi:include href="../specs/specs_gen_event.xml"/> <xi:include href="../specs/specs_gen_fsm.xml"/> <xi:include href="../specs/specs_gen_server.xml"/> + <xi:include href="../specs/specs_gen_statem.xml"/> <xi:include href="../specs/specs_io.xml"/> <xi:include href="../specs/specs_io_lib.xml"/> <xi:include href="../specs/specs_lib.xml"/> diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml index 421306283c..29e5a732d5 100644 --- a/lib/stdlib/doc/src/supervisor.xml +++ b/lib/stdlib/doc/src/supervisor.xml @@ -34,8 +34,8 @@ <p>A behaviour module for implementing a supervisor, a process which supervises other processes called child processes. A child process can either be another supervisor or a worker process. - Worker processes are normally implemented using one of - the <c>gen_event</c>, <c>gen_fsm</c>, or <c>gen_server</c> + Worker processes are normally implemented using one of the + <c>gen_event</c>, <c>gen_fsm</c>, <c>gen_statem</c> or <c>gen_server</c> behaviours. A supervisor implemented using this module will have a standard set of interface functions and include functionality for tracing and error reporting. Supervisors are used to build a @@ -221,7 +221,8 @@ <p><c>modules</c> is used by the release handler during code replacement to determine which processes are using a certain module. As a rule of thumb, if the child process is a - <c>supervisor</c>, <c>gen_server</c>, or <c>gen_fsm</c>, + <c>supervisor</c>, <c>gen_server</c>, + <c>gen_fsm</c> or <c>gen_statem</c> this should be a list with one element <c>[Module]</c>, where <c>Module</c> is the callback module. If the child process is an event manager (<c>gen_event</c>) with a @@ -636,6 +637,7 @@ <title>SEE ALSO</title> <p><seealso marker="gen_event">gen_event(3)</seealso>, <seealso marker="gen_fsm">gen_fsm(3)</seealso>, + <seealso marker="gen_statem">gen_statem(3)</seealso>, <seealso marker="gen_server">gen_server(3)</seealso>, <seealso marker="sys">sys(3)</seealso></p> </section> diff --git a/lib/stdlib/doc/src/sys.xml b/lib/stdlib/doc/src/sys.xml index d80ec4dfa6..2255395f46 100644 --- a/lib/stdlib/doc/src/sys.xml +++ b/lib/stdlib/doc/src/sys.xml @@ -217,14 +217,18 @@ processes. For example, a <c>gen_server</c> process returns the callback module's state, a <c>gen_fsm</c> process returns information such as its current state name and state data, - and a <c>gen_event</c> process returns information about each of its + a <c>gen_statem</c> process returns information about + its current state and data, and a <c>gen_event</c> process + returns information about each of its registered handlers. Callback modules for <c>gen_server</c>, - <c>gen_fsm</c>, and <c>gen_event</c> can also customise the value + <c>gen_fsm</c>, <c>gen_statem</c> and <c>gen_event</c> + can also customise the value of <c><anno>Misc</anno></c> by exporting a <c>format_status/2</c> function that contributes module-specific information; - see <seealso marker="gen_server#Module:format_status/2">gen_server:format_status/2</seealso>, - <seealso marker="gen_fsm#Module:format_status/2">gen_fsm:format_status/2</seealso>, and - <seealso marker="gen_event#Module:format_status/2">gen_event:format_status/2</seealso> + see <seealso marker="gen_server#Module:format_status/2">gen_server format_status/2</seealso>, + <seealso marker="gen_fsm#Module:format_status/2">gen_fsm format_status/2</seealso>, + <seealso marker="gen_statem#Module:format_status/2">gen_statem format_status/2</seealso>, and + <seealso marker="gen_event#Module:format_status/2">gen_event format_status/2</seealso> for more details.</p> </desc> </func> @@ -245,6 +249,8 @@ processes. For a <c>gen_server</c> process, the returned <c><anno>State</anno></c> is simply the callback module's state. For a <c>gen_fsm</c> process, <c><anno>State</anno></c> is the tuple <c>{CurrentStateName, CurrentStateData}</c>. + For a <c>gen_statem</c> process <c><anno>State</anno></c> is + the tuple <c>{CurrentState,CurrentData}.</c> For a <c>gen_event</c> process, <c><anno>State</anno></c> a list of tuples, where each tuple corresponds to an event handler registered in the process and contains <c>{Module, Id, HandlerState}</c>, where <c>Module</c> is the event handler's module name, @@ -263,8 +269,9 @@ details of the exception.</p> <p>The <c>system_get_state/1</c> function is primarily useful for user-defined behaviours and modules that implement OTP <seealso marker="#special_process">special - processes</seealso>. The <c>gen_server</c>, <c>gen_fsm</c>, and <c>gen_event</c> OTP - behaviour modules export this function, and so callback modules for those behaviours + processes</seealso>. The <c>gen_server</c>, <c>gen_fsm</c>, + <c>gen_statem</c> and <c>gen_event</c> OTP + behaviour modules export this function, so callback modules for those behaviours need not supply their own.</p> <p>To obtain more information about a process, including its state, see <seealso marker="#get_status-1">get_status/1</seealso> and @@ -290,6 +297,8 @@ <c>gen_fsm</c> process, <c><anno>State</anno></c> is the tuple <c>{CurrentStateName, CurrentStateData}</c>, and <c><anno>NewState</anno></c> is a similar tuple that may contain a new state name, new state data, or both. + The same applies for a <c>gen_statem</c> process but + it names the tuple fields <c>{CurrentState,CurrentData}</c>. For a <c>gen_event</c> process, <c><anno>State</anno></c> is the tuple <c>{Module, Id, HandlerState}</c> where <c>Module</c> is the event handler's module name, <c>Id</c> is the handler's ID (which is the value <c>false</c> if it was registered without @@ -304,7 +313,8 @@ state, then regardless of process type, it may simply return its <c><anno>State</anno></c> argument.</p> <p>If a <c><anno>StateFun</anno></c> function crashes or throws an exception, then - for <c>gen_server</c> and <c>gen_fsm</c> processes, the original state of the process is + for <c>gen_server</c>, <c>gen_fsm</c> or <c>gen_statem</c> processes, + the original state of the process is unchanged. For <c>gen_event</c> processes, a crashing or failing <c><anno>StateFun</anno></c> function means that only the state of the particular event handler it was working on when it failed or crashed is unchanged; it can still succeed in changing the states of other event @@ -329,7 +339,8 @@ <c>{callback_failed, StateFun, {Class, Reason}}</c>.</p> <p>The <c>system_replace_state/2</c> function is primarily useful for user-defined behaviours and modules that implement OTP <seealso marker="#special_process">special processes</seealso>. The - <c>gen_server</c>, <c>gen_fsm</c>, and <c>gen_event</c> OTP behaviour modules export this function, + <c>gen_server</c>, <c>gen_fsm</c>, <c>gen_statem</c> and + <c>gen_event</c> OTP behaviour modules export this function, and so callback modules for those behaviours need not supply their own.</p> </desc> </func> diff --git a/lib/stdlib/src/Makefile b/lib/stdlib/src/Makefile index 9f4a446ea0..302834f9d0 100644 --- a/lib/stdlib/src/Makefile +++ b/lib/stdlib/src/Makefile @@ -1,7 +1,7 @@ # # %CopyrightBegin% # -# Copyright Ericsson AB 1996-2015. All Rights Reserved. +# Copyright Ericsson AB 1996-2016. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -85,6 +85,7 @@ MODULES= \ gen_event \ gen_fsm \ gen_server \ + gen_statem \ io \ io_lib \ io_lib_format \ diff --git a/lib/stdlib/src/gen.erl b/lib/stdlib/src/gen.erl index 9811a211ae..597830cf9a 100644 --- a/lib/stdlib/src/gen.erl +++ b/lib/stdlib/src/gen.erl @@ -26,7 +26,8 @@ %%% %%% The standard behaviour should export init_it/6. %%%----------------------------------------------------------------- --export([start/5, start/6, debug_options/1, +-export([start/5, start/6, debug_options/2, + name/1, unregister_name/1, get_proc_name/1, get_parent/0, call/3, call/4, reply/2, stop/1, stop/3]). -export([init_it/6, init_it/7]). @@ -124,7 +125,7 @@ init_it(GenMod, Starter, Parent, Mod, Args, Options) -> init_it2(GenMod, Starter, Parent, self(), Mod, Args, Options). init_it(GenMod, Starter, Parent, Name, Mod, Args, Options) -> - case name_register(Name) of + case register_name(Name) of true -> init_it2(GenMod, Starter, Parent, Name, Mod, Args, Options); {false, Pid} -> @@ -297,19 +298,19 @@ where({global, Name}) -> global:whereis_name(Name); where({via, Module, Name}) -> Module:whereis_name(Name); where({local, Name}) -> whereis(Name). -name_register({local, Name} = LN) -> +register_name({local, Name} = LN) -> try register(Name, self()) of true -> true catch error:_ -> {false, where(LN)} end; -name_register({global, Name} = GN) -> +register_name({global, Name} = GN) -> case global:register_name(Name, self()) of yes -> true; no -> {false, where(GN)} end; -name_register({via, Module, Name} = GN) -> +register_name({via, Module, Name} = GN) -> case Module:register_name(Name, self()) of yes -> true; @@ -317,34 +318,108 @@ name_register({via, Module, Name} = GN) -> {false, where(GN)} end. +name({local,Name}) -> Name; +name({global,Name}) -> Name; +name({via,_, Name}) -> Name; +name(Pid) when is_pid(Pid) -> Pid. + +unregister_name({local,Name}) -> + try unregister(Name) of + _ -> ok + catch + _:_ -> ok + end; +unregister_name({global,Name}) -> + _ = global:unregister_name(Name), + ok; +unregister_name({via, Mod, Name}) -> + _ = Mod:unregister_name(Name), + ok; +unregister_name(Pid) when is_pid(Pid) -> + ok. + +get_proc_name(Pid) when is_pid(Pid) -> + Pid; +get_proc_name({local, Name}) -> + case process_info(self(), registered_name) of + {registered_name, Name} -> + Name; + {registered_name, _Name} -> + exit(process_not_registered); + [] -> + exit(process_not_registered) + end; +get_proc_name({global, Name}) -> + case global:whereis_name(Name) of + undefined -> + exit(process_not_registered_globally); + Pid when Pid =:= self() -> + Name; + _Pid -> + exit(process_not_registered_globally) + end; +get_proc_name({via, Mod, Name}) -> + case Mod:whereis_name(Name) of + undefined -> + exit({process_not_registered_via, Mod}); + Pid when Pid =:= self() -> + Name; + _Pid -> + exit({process_not_registered_via, Mod}) + end. + +get_parent() -> + case get('$ancestors') of + [Parent | _] when is_pid(Parent) -> + Parent; + [Parent | _] when is_atom(Parent) -> + name_to_pid(Parent); + _ -> + exit(process_was_not_started_by_proc_lib) + end. + +name_to_pid(Name) -> + case whereis(Name) of + undefined -> + case global:whereis_name(Name) of + undefined -> + exit(could_not_find_registered_name); + Pid -> + Pid + end; + Pid -> + Pid + end. + timeout(Options) -> - case opt(timeout, Options) of - {ok, Time} -> + case lists:keyfind(timeout, 1, Options) of + {_,Time} -> Time; - _ -> + false -> infinity end. spawn_opts(Options) -> - case opt(spawn_opt, Options) of - {ok, Opts} -> + case lists:keyfind(spawn_opt, 1, Options) of + {_,Opts} -> Opts; - _ -> + false -> [] end. -opt(Op, [{Op, Value}|_]) -> - {ok, Value}; -opt(Op, [_|Options]) -> - opt(Op, Options); -opt(_, []) -> - false. - -debug_options(Opts) -> - case opt(debug, Opts) of - {ok, Options} -> sys:debug_options(Options); - _ -> [] +debug_options(Name, Opts) -> + case lists:keyfind(debug, 1, Opts) of + {_,Options} -> + try sys:debug_options(Options) + catch _:_ -> + error_logger:format( + "~p: ignoring erroneous debug options - ~p~n", + [Name,Options]), + [] + end; + false -> + [] end. format_status_header(TagLine, Pid) when is_pid(Pid) -> diff --git a/lib/stdlib/src/gen_event.erl b/lib/stdlib/src/gen_event.erl index 1303036168..ccacf658e9 100644 --- a/lib/stdlib/src/gen_event.erl +++ b/lib/stdlib/src/gen_event.erl @@ -147,16 +147,11 @@ init_it(Starter, self, Name, Mod, Args, Options) -> init_it(Starter, self(), Name, Mod, Args, Options); init_it(Starter, Parent, Name0, _, _, Options) -> process_flag(trap_exit, true), - Debug = gen:debug_options(Options), + Name = gen:name(Name0), + Debug = gen:debug_options(Name, Options), proc_lib:init_ack(Starter, {ok, self()}), - Name = name(Name0), loop(Parent, Name, [], Debug, false). -name({local,Name}) -> Name; -name({global,Name}) -> Name; -name({via,_, Name}) -> Name; -name(Pid) when is_pid(Pid) -> Pid. - -spec add_handler(emgr_ref(), handler(), term()) -> term(). add_handler(M, Handler, Args) -> rpc(M, {add_handler, Handler, Args}). diff --git a/lib/stdlib/src/gen_fsm.erl b/lib/stdlib/src/gen_fsm.erl index 2b4b76105e..6e7528fd98 100644 --- a/lib/stdlib/src/gen_fsm.erl +++ b/lib/stdlib/src/gen_fsm.erl @@ -305,64 +305,11 @@ enter_loop(Mod, Options, StateName, StateData, Timeout) -> enter_loop(Mod, Options, StateName, StateData, self(), Timeout). enter_loop(Mod, Options, StateName, StateData, ServerName, Timeout) -> - Name = get_proc_name(ServerName), - Parent = get_parent(), - Debug = gen:debug_options(Options), + Name = gen:get_proc_name(ServerName), + Parent = gen:get_parent(), + Debug = gen:debug_options(Name, Options), loop(Parent, Name, StateName, StateData, Mod, Timeout, Debug). -get_proc_name(Pid) when is_pid(Pid) -> - Pid; -get_proc_name({local, Name}) -> - case process_info(self(), registered_name) of - {registered_name, Name} -> - Name; - {registered_name, _Name} -> - exit(process_not_registered); - [] -> - exit(process_not_registered) - end; -get_proc_name({global, Name}) -> - case global:whereis_name(Name) of - undefined -> - exit(process_not_registered_globally); - Pid when Pid =:= self() -> - Name; - _Pid -> - exit(process_not_registered_globally) - end; -get_proc_name({via, Mod, Name}) -> - case Mod:whereis_name(Name) of - undefined -> - exit({process_not_registered_via, Mod}); - Pid when Pid =:= self() -> - Name; - _Pid -> - exit({process_not_registered_via, Mod}) - end. - -get_parent() -> - case get('$ancestors') of - [Parent | _] when is_pid(Parent) -> - Parent; - [Parent | _] when is_atom(Parent) -> - name_to_pid(Parent); - _ -> - exit(process_was_not_started_by_proc_lib) - end. - -name_to_pid(Name) -> - case whereis(Name) of - undefined -> - case global:whereis_name(Name) of - undefined -> - exit(could_not_find_registered_name); - Pid -> - Pid - end; - Pid -> - Pid - end. - %%% --------------------------------------------------- %%% Initiate the new process. %%% Register the name using the Rfunc function @@ -373,8 +320,8 @@ name_to_pid(Name) -> init_it(Starter, self, Name, Mod, Args, Options) -> init_it(Starter, self(), Name, Mod, Args, Options); init_it(Starter, Parent, Name0, Mod, Args, Options) -> - Name = name(Name0), - Debug = gen:debug_options(Options), + Name = gen:name(Name0), + Debug = gen:debug_options(Name, Options), case catch Mod:init(Args) of {ok, StateName, StateData} -> proc_lib:init_ack(Starter, {ok, self()}), @@ -383,15 +330,15 @@ init_it(Starter, Parent, Name0, Mod, Args, Options) -> proc_lib:init_ack(Starter, {ok, self()}), loop(Parent, Name, StateName, StateData, Mod, Timeout, Debug); {stop, Reason} -> - unregister_name(Name0), + gen:unregister_name(Name0), proc_lib:init_ack(Starter, {error, Reason}), exit(Reason); ignore -> - unregister_name(Name0), + gen:unregister_name(Name0), proc_lib:init_ack(Starter, ignore), exit(normal); {'EXIT', Reason} -> - unregister_name(Name0), + gen:unregister_name(Name0), proc_lib:init_ack(Starter, {error, Reason}), exit(Reason); Else -> @@ -400,20 +347,6 @@ init_it(Starter, Parent, Name0, Mod, Args, Options) -> exit(Error) end. -name({local,Name}) -> Name; -name({global,Name}) -> Name; -name({via,_, Name}) -> Name; -name(Pid) when is_pid(Pid) -> Pid. - -unregister_name({local,Name}) -> - _ = (catch unregister(Name)); -unregister_name({global,Name}) -> - _ = global:unregister_name(Name); -unregister_name({via, Mod, Name}) -> - _ = Mod:unregister_name(Name); -unregister_name(Pid) when is_pid(Pid) -> - Pid. - %%----------------------------------------------------------------- %% The MAIN loop %%----------------------------------------------------------------- diff --git a/lib/stdlib/src/gen_server.erl b/lib/stdlib/src/gen_server.erl index fa6fff6dca..5800aca66f 100644 --- a/lib/stdlib/src/gen_server.erl +++ b/lib/stdlib/src/gen_server.erl @@ -304,9 +304,9 @@ enter_loop(Mod, Options, State, Timeout) -> enter_loop(Mod, Options, State, self(), Timeout). enter_loop(Mod, Options, State, ServerName, Timeout) -> - Name = get_proc_name(ServerName), - Parent = get_parent(), - Debug = debug_options(Name, Options), + Name = gen:get_proc_name(ServerName), + Parent = gen:get_parent(), + Debug = gen:debug_options(Name, Options), loop(Parent, Name, State, Mod, Timeout, Debug). %%%======================================================================== @@ -323,8 +323,8 @@ enter_loop(Mod, Options, State, ServerName, Timeout) -> init_it(Starter, self, Name, Mod, Args, Options) -> init_it(Starter, self(), Name, Mod, Args, Options); init_it(Starter, Parent, Name0, Mod, Args, Options) -> - Name = name(Name0), - Debug = debug_options(Name, Options), + Name = gen:name(Name0), + Debug = gen:debug_options(Name, Options), case catch Mod:init(Args) of {ok, State} -> proc_lib:init_ack(Starter, {ok, self()}), @@ -339,15 +339,15 @@ init_it(Starter, Parent, Name0, Mod, Args, Options) -> %% (Otherwise, the parent process could get %% an 'already_started' error if it immediately %% tried starting the process again.) - unregister_name(Name0), + gen:unregister_name(Name0), proc_lib:init_ack(Starter, {error, Reason}), exit(Reason); ignore -> - unregister_name(Name0), + gen:unregister_name(Name0), proc_lib:init_ack(Starter, ignore), exit(normal); {'EXIT', Reason} -> - unregister_name(Name0), + gen:unregister_name(Name0), proc_lib:init_ack(Starter, {error, Reason}), exit(Reason); Else -> @@ -356,20 +356,6 @@ init_it(Starter, Parent, Name0, Mod, Args, Options) -> exit(Error) end. -name({local,Name}) -> Name; -name({global,Name}) -> Name; -name({via,_, Name}) -> Name; -name(Pid) when is_pid(Pid) -> Pid. - -unregister_name({local,Name}) -> - _ = (catch unregister(Name)); -unregister_name({global,Name}) -> - _ = global:unregister_name(Name); -unregister_name({via, Mod, Name}) -> - _ = Mod:unregister_name(Name); -unregister_name(Pid) when is_pid(Pid) -> - Pid. - %%%======================================================================== %%% Internal functions %%%======================================================================== @@ -858,86 +844,6 @@ error_info(Reason, Name, Msg, State, Debug) -> sys:print_log(Debug), ok. -%%% --------------------------------------------------- -%%% Misc. functions. -%%% --------------------------------------------------- - -opt(Op, [{Op, Value}|_]) -> - {ok, Value}; -opt(Op, [_|Options]) -> - opt(Op, Options); -opt(_, []) -> - false. - -debug_options(Name, Opts) -> - case opt(debug, Opts) of - {ok, Options} -> dbg_opts(Name, Options); - _ -> [] - end. - -dbg_opts(Name, Opts) -> - case catch sys:debug_options(Opts) of - {'EXIT',_} -> - format("~p: ignoring erroneous debug options - ~p~n", - [Name, Opts]), - []; - Dbg -> - Dbg - end. - -get_proc_name(Pid) when is_pid(Pid) -> - Pid; -get_proc_name({local, Name}) -> - case process_info(self(), registered_name) of - {registered_name, Name} -> - Name; - {registered_name, _Name} -> - exit(process_not_registered); - [] -> - exit(process_not_registered) - end; -get_proc_name({global, Name}) -> - case global:whereis_name(Name) of - undefined -> - exit(process_not_registered_globally); - Pid when Pid =:= self() -> - Name; - _Pid -> - exit(process_not_registered_globally) - end; -get_proc_name({via, Mod, Name}) -> - case Mod:whereis_name(Name) of - undefined -> - exit({process_not_registered_via, Mod}); - Pid when Pid =:= self() -> - Name; - _Pid -> - exit({process_not_registered_via, Mod}) - end. - -get_parent() -> - case get('$ancestors') of - [Parent | _] when is_pid(Parent)-> - Parent; - [Parent | _] when is_atom(Parent)-> - name_to_pid(Parent); - _ -> - exit(process_was_not_started_by_proc_lib) - end. - -name_to_pid(Name) -> - case whereis(Name) of - undefined -> - case global:whereis_name(Name) of - undefined -> - exit(could_not_find_registered_name); - Pid -> - Pid - end; - Pid -> - Pid - end. - %%----------------------------------------------------------------- %% Status information %%----------------------------------------------------------------- diff --git a/lib/stdlib/src/gen_statem.erl b/lib/stdlib/src/gen_statem.erl new file mode 100644 index 0000000000..c85c521d8e --- /dev/null +++ b/lib/stdlib/src/gen_statem.erl @@ -0,0 +1,1257 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2016. All Rights Reserved. +%% +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at +%% +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. +%% +%% %CopyrightEnd% +%% +-module(gen_statem). + +%% API +-export( + [start/3,start/4,start_link/3,start_link/4, + stop/1,stop/3, + cast/2,call/2,call/3, + enter_loop/5,enter_loop/6,enter_loop/7, + reply/1,reply/2]). + +%% gen callbacks +-export( + [init_it/6]). + +%% sys callbacks +-export( + [system_continue/3, + system_terminate/4, + system_code_change/4, + system_get_state/1, + system_replace_state/2, + format_status/2]). + +%% Internal callbacks +-export( + [wakeup_from_hibernate/3]). + +%% Type exports for templates +-export_type( + [event_type/0, + callback_mode/0, + state_function_result/0, + handle_event_result/0, + action/0]). + +%% Fix problem for doc build +-export_type([transition_option/0]). + +%%%========================================================================== +%%% Interface functions. +%%%========================================================================== + +-type from() :: + {To :: pid(), Tag :: term()}. % Reply-to specifier for call + +-type state() :: + state_name() | % For state callback function StateName/5 + term(). % For state callback function handle_event/5 + +-type state_name() :: atom(). + +-type data() :: term(). + +-type event_type() :: + {'call',From :: from()} | 'cast' | + 'info' | 'timeout' | 'internal'. + +-type callback_mode() :: 'state_functions' | 'handle_event_function'. + +-type transition_option() :: + postpone() | hibernate() | event_timeout(). +-type postpone() :: + %% If 'true' postpone the current event + %% and retry it when the state changes (=/=) + boolean(). +-type hibernate() :: + %% If 'true' hibernate the server instead of going into receive + boolean(). +-type event_timeout() :: + %% Generate a ('timeout', EventContent, ...) event after Time + %% unless some other event is delivered + Time :: timeout(). + +-type action() :: + %% During a state change: + %% * NextState and NewData are set. + %% * All action()s are executed in order of apperance. + %% * Postponing the current event is performed + %% iff 'postpone' is 'true'. + %% * A state timer is started iff 'timeout' is set. + %% * Pending events are processed or if there are + %% no pending events the server goes into receive + %% or hibernate (iff 'hibernate' is 'true') + %% + %% These action()s are executed in order of appearence + %% in the containing list. The ones that set options + %% will override any previous so the last of each kind wins. + %% + 'postpone' | % Set the postpone option + {'postpone', Postpone :: postpone()} | + %% + 'hibernate' | % Set the hibernate option + {'hibernate', Hibernate :: hibernate()} | + %% + (Timeout :: event_timeout()) | % {timeout,Timeout} + {'timeout', % Set the event timeout option + Time :: event_timeout(), EventContent :: term()} | + %% + reply_action() | + %% + %% All 'next_event' events are kept in a list and then + %% inserted at state changes so the first in the + %% action() list is the first to be delivered. + {'next_event', % Insert event as the next to handle + EventType :: event_type(), + EventContent :: term()}. +-type reply_action() :: + {'reply', % Reply to a caller + From :: from(), Reply :: term()}. + +-type state_function_result() :: + {'next_state', % {next_state,NextStateName,NewData,[]} + NextStateName :: state_name(), + NewData :: data()} | + {'next_state', % State transition, maybe to the same state + NextStateName :: state_name(), + NewData :: data(), + Actions :: [action()] | action()} | + common_state_callback_result(). +-type handle_event_result() :: + {'next_state', % {next_state,NextState,NewData,[]} + NextState :: state(), + NewData :: data()} | + {'next_state', % State transition, maybe to the same state + NextState :: state(), + NewData :: data(), + Actions :: [action()] | action()} | + common_state_callback_result(). +-type common_state_callback_result() :: + 'stop' | % {stop,normal} + {'stop', % Stop the server + Reason :: term()} | + {'stop', % Stop the server + Reason :: term(), + NewData :: data()} | + {'stop_and_reply', % Reply then stop the server + Reason :: term(), + Replies :: [reply_action()] | reply_action()} | + {'stop_and_reply', % Reply then stop the server + Reason :: term(), + Replies :: [reply_action()] | reply_action(), + NewData :: data()} | + {'keep_state', % {keep_state,NewData,[]} + NewData :: data()} | + {'keep_state', % Keep state, change data + NewData :: data(), + Actions :: [action()] | action()} | + 'keep_state_and_data' | % {keep_state_and_data,[]} + {'keep_state_and_data', % Keep state and data -> only actions + Actions :: [action()] | action()}. + + +%% The state machine init function. It is called only once and +%% the server is not running until this function has returned +%% an {ok, ...} tuple. Thereafter the state callbacks are called +%% for all events to this server. +-callback init(Args :: term()) -> + {callback_mode(), state(), data()} | + {callback_mode(), state(), data(), [action()] | action()} | + 'ignore' | + {'stop', Reason :: term()}. + +%% Example state callback for callback_mode() =:= state_functions +%% state name 'state_name'. +%% +%% In this mode all states has to be type state_name() i.e atom(). +%% +%% Note that state callbacks and only state callbacks have arity 5 +%% and that is intended. +-callback state_name( + event_type(), + EventContent :: term(), + Data :: data()) -> + state_function_result(). +%% +%% State callback for callback_mode() =:= handle_event_function. +%% +%% Note that state callbacks and only state callbacks have arity 5 +%% and that is intended. +-callback handle_event( + event_type(), + EventContent :: term(), + State :: state(), % Current state + Data :: data()) -> + handle_event_result(). + +%% Clean up before the server terminates. +-callback terminate( + Reason :: 'normal' | 'shutdown' | {'shutdown', term()} + | term(), + State :: state(), + Data :: data()) -> + any(). + +%% Note that the new code can expect to get an OldState from +%% the old code version not only in code_change/4 but in the first +%% state callback function called thereafter +-callback code_change( + OldVsn :: term() | {'down', term()}, + OldState :: state(), + OldData :: data(), + Extra :: term()) -> + {NewCallbackMode :: callback_mode(), + NewState :: state(), + NewData :: data()}. + +%% Format the callback module state in some sensible that is +%% often condensed way. For StatusOption =:= 'normal' the perferred +%% return term is [{data,[{"State",FormattedState}]}], and for +%% StatusOption =:= 'terminate' it is just FormattedState. +-callback format_status( + StatusOption, + [ [{Key :: term(), Value :: term()}] | + state() | + data()]) -> + Status :: term() when + StatusOption :: 'normal' | 'terminate'. + +-optional_callbacks( + [init/1, % One may use enter_loop/5,6,7 instead + format_status/2, % Has got a default implementation + %% + state_name/3, % Example for callback_mode =:= state_functions: + %% there has to be a StateName/5 callback function for every StateName. + %% + handle_event/4]). % For callback_mode =:= handle_event_function + +%% Type validation functions +callback_mode(CallbackMode) -> + case CallbackMode of + state_functions -> + true; + handle_event_function -> + true; + _ -> + false + end. +%% +from({Pid,_}) when is_pid(Pid) -> + true; +from(_) -> + false. +%% +event_type({call,From}) -> + from(From); +event_type(Type) -> + case Type of + cast -> + true; + info -> + true; + timeout -> + true; + internal -> + true; + _ -> + false + end. + + + +-define( + STACKTRACE(), + try throw(ok) catch _ -> erlang:get_stacktrace() end). + +-define( + TERMINATE(Class, Reason, Debug, S, Q), + terminate( + begin Class end, + begin Reason end, + ?STACKTRACE(), + begin Debug end, + begin S end, + begin Q end)). + +%%%========================================================================== +%%% API + +-type server_name() :: + {'global', GlobalName :: term()} + | {'via', RegMod :: module(), Name :: term()} + | {'local', atom()}. +-type server_ref() :: + {'global', GlobalName :: term()} + | {'via', RegMod :: module(), ViaName :: term()} + | (LocalName :: atom()) + | {Name :: atom(), Node :: atom()} + | pid(). +-type debug_opt() :: + {'debug', + Dbgs :: + ['trace' | 'log' | 'statistics' | 'debug' + | {'logfile', string()}]}. +-type start_opt() :: + debug_opt() + | {'timeout', Time :: timeout()} + | {'spawn_opt', [proc_lib:spawn_option()]}. +-type start_ret() :: {'ok', pid()} | 'ignore' | {'error', term()}. + + + +%% Start a state machine +-spec start( + Module :: module(), Args :: term(), Opts :: [start_opt()]) -> + start_ret(). +start(Module, Args, Opts) -> + gen:start(?MODULE, nolink, Module, Args, Opts). +%% +-spec start( + ServerName :: server_name(), + Module :: module(), Args :: term(), Opts :: [start_opt()]) -> + start_ret(). +start(ServerName, Module, Args, Opts) -> + gen:start(?MODULE, nolink, ServerName, Module, Args, Opts). + +%% Start and link to a state machine +-spec start_link( + Module :: module(), Args :: term(), Opts :: [start_opt()]) -> + start_ret(). +start_link(Module, Args, Opts) -> + gen:start(?MODULE, link, Module, Args, Opts). +%% +-spec start_link( + ServerName :: server_name(), + Module :: module(), Args :: term(), Opts :: [start_opt()]) -> + start_ret(). +start_link(ServerName, Module, Args, Opts) -> + gen:start(?MODULE, link, ServerName, Module, Args, Opts). + +%% Stop a state machine +-spec stop(ServerRef :: server_ref()) -> ok. +stop(ServerRef) -> + gen:stop(ServerRef). +%% +-spec stop( + ServerRef :: server_ref(), + Reason :: term(), + Timeout :: timeout()) -> ok. +stop(ServerRef, Reason, Timeout) -> + gen:stop(ServerRef, Reason, Timeout). + +%% Send an event to a state machine that arrives with type 'event' +-spec cast(ServerRef :: server_ref(), Msg :: term()) -> ok. +cast({global,Name}, Msg) -> + try global:send(Name, wrap_cast(Msg)) of + _ -> ok + catch + _:_ -> ok + end; +cast({via,RegMod,Name}, Msg) -> + try RegMod:send(Name, wrap_cast(Msg)) of + _ -> ok + catch + _:_ -> ok + end; +cast({Name,Node} = ServerRef, Msg) when is_atom(Name), is_atom(Node) -> + send(ServerRef, wrap_cast(Msg)); +cast(ServerRef, Msg) when is_atom(ServerRef) -> + send(ServerRef, wrap_cast(Msg)); +cast(ServerRef, Msg) when is_pid(ServerRef) -> + send(ServerRef, wrap_cast(Msg)). + +%% Call a state machine (synchronous; a reply is expected) that +%% arrives with type {call,From} +-spec call(ServerRef :: server_ref(), Request :: term()) -> Reply :: term(). +call(ServerRef, Request) -> + call(ServerRef, Request, infinity). +%% +-spec call( + ServerRef :: server_ref(), + Request :: term(), + Timeout :: timeout()) -> + Reply :: term(). +call(ServerRef, Request, infinity) -> + try gen:call(ServerRef, '$gen_call', Request, infinity) of + {ok,Reply} -> + Reply + catch + Class:Reason -> + erlang:raise( + Class, + {Reason,{?MODULE,call,[ServerRef,Request,infinity]}}, + erlang:get_stacktrace()) + end; +call(ServerRef, Request, Timeout) -> + %% Call server through proxy process to dodge any late reply + Ref = make_ref(), + Self = self(), + Pid = spawn( + fun () -> + Self ! + try gen:call( + ServerRef, '$gen_call', Request, Timeout) of + Result -> + {Ref,Result} + catch Class:Reason -> + {Ref,Class,Reason,erlang:get_stacktrace()} + end + end), + Mref = monitor(process, Pid), + receive + {Ref,Result} -> + demonitor(Mref, [flush]), + case Result of + {ok,Reply} -> + Reply + end; + {Ref,Class,Reason,Stacktrace} -> + demonitor(Mref, [flush]), + erlang:raise( + Class, + {Reason,{?MODULE,call,[ServerRef,Request,Timeout]}}, + Stacktrace); + {'DOWN',Mref,_,_,Reason} -> + %% There is a theoretical possibility that the + %% proxy process gets killed between try--of and ! + %% so this clause is in case of that + exit(Reason) + end. + +%% Reply from a state machine callback to whom awaits in call/2 +-spec reply([reply_action()] | reply_action()) -> ok. +reply({reply,From,Reply}) -> + reply(From, Reply); +reply(Replies) when is_list(Replies) -> + replies(Replies). +%% +-spec reply(From :: from(), Reply :: term()) -> ok. +reply({To,Tag}, Reply) when is_pid(To) -> + Msg = {Tag,Reply}, + try To ! Msg of + _ -> + ok + catch + _:_ -> ok + end. + +%% Instead of starting the state machine through start/3,4 +%% or start_link/3,4 turn the current process presumably +%% started by proc_lib into a state machine using +%% the same arguments as you would have returned from init/1 +-spec enter_loop( + Module :: module(), Opts :: [debug_opt()], + CallbackMode :: callback_mode(), + State :: state(), Data :: data()) -> + no_return(). +enter_loop(Module, Opts, CallbackMode, State, Data) -> + enter_loop(Module, Opts, CallbackMode, State, Data, self()). +%% +-spec enter_loop( + Module :: module(), Opts :: [debug_opt()], + CallbackMode :: callback_mode(), + State :: state(), Data :: data(), + Server_or_Actions :: + server_name() | pid() | [action()]) -> + no_return(). +enter_loop(Module, Opts, CallbackMode, State, Data, Server_or_Actions) -> + if + is_list(Server_or_Actions) -> + enter_loop( + Module, Opts, CallbackMode, State, Data, + self(), Server_or_Actions); + true -> + enter_loop( + Module, Opts, CallbackMode, State, Data, + Server_or_Actions, []) + end. +%% +-spec enter_loop( + Module :: module(), Opts :: [debug_opt()], + CallbackMode :: callback_mode(), + State :: state(), Data :: data(), + Server :: server_name() | pid(), + Actions :: [action()] | action()) -> + no_return(). +enter_loop(Module, Opts, CallbackMode, State, Data, Server, Actions) -> + is_atom(Module) orelse error({atom,Module}), + callback_mode(CallbackMode) orelse error({callback_mode,CallbackMode}), + Parent = gen:get_parent(), + enter(Module, Opts, CallbackMode, State, Data, Server, Actions, Parent). + +%%--------------------------------------------------------------------------- +%% API helpers + +wrap_cast(Event) -> + {'$gen_cast',Event}. + +replies([{reply,From,Reply}|Replies]) -> + reply(From, Reply), + replies(Replies); +replies([]) -> + ok. + +%% Might actually not send the message in case of caught exception +send(Proc, Msg) -> + try erlang:send(Proc, Msg, [noconnect]) of + noconnect -> + _ = spawn(erlang, send, [Proc,Msg]), + ok; + ok -> + ok + catch + _:_ -> + ok + end. + +%% Here init_it/6 and enter_loop/5,6,7 functions converge +enter(Module, Opts, CallbackMode, State, Data, Server, Actions, Parent) -> + %% The values should already have been type checked + Name = gen:get_proc_name(Server), + Debug = gen:debug_options(Name, Opts), + PrevState = make_ref(), % Will be discarded by loop_event_actions/9 + NewActions = + if + is_list(Actions) -> + Actions ++ [{postpone,false}]; + true -> + [Actions,{postpone,false}] + end, + S = #{ + callback_mode => CallbackMode, + module => Module, + name => Name, + state => PrevState, + data => Data, + timer => undefined, + postponed => [], + hibernate => false}, + loop_event_actions( + Parent, Debug, S, [], + {event,undefined}, % Will be discarded thanks to {postpone,false} + PrevState, State, Data, NewActions). + +%%%========================================================================== +%%% gen callbacks + +init_it(Starter, self, ServerRef, Module, Args, Opts) -> + init_it(Starter, self(), ServerRef, Module, Args, Opts); +init_it(Starter, Parent, ServerRef, Module, Args, Opts) -> + try Module:init(Args) of + Result -> + init_result(Starter, Parent, ServerRef, Module, Result, Opts) + catch + Result -> + init_result(Starter, Parent, ServerRef, Module, Result, Opts); + Class:Reason -> + gen:unregister_name(ServerRef), + proc_lib:init_ack(Starter, {error,Reason}), + erlang:raise(Class, Reason, erlang:get_stacktrace()) + end. + +%%--------------------------------------------------------------------------- +%% gen callbacks helpers + +init_result(Starter, Parent, ServerRef, Module, Result, Opts) -> + case Result of + {CallbackMode,State,Data} -> + case callback_mode(CallbackMode) of + true -> + proc_lib:init_ack(Starter, {ok,self()}), + enter( + Module, Opts, CallbackMode, State, Data, + ServerRef, [], Parent); + false -> + Error = {callback_mode,CallbackMode}, + proc_lib:init_ack(Starter, {error,Error}), + exit(Error) + end; + {CallbackMode,State,Data,Actions} -> + case callback_mode(CallbackMode) of + true -> + proc_lib:init_ack(Starter, {ok,self()}), + enter( + Module, Opts, CallbackMode, State, Data, + ServerRef, Actions, Parent); + false -> + Error = {callback_mode,CallbackMode}, + proc_lib:init_ack(Starter, {error,Error}), + exit(Error) + end; + {stop,Reason} -> + gen:unregister_name(ServerRef), + proc_lib:init_ack(Starter, {error,Reason}), + exit(Reason); + ignore -> + gen:unregister_name(ServerRef), + proc_lib:init_ack(Starter, ignore), + exit(normal); + _ -> + Error = {bad_return_value,Result}, + proc_lib:init_ack(Starter, {error,Error}), + exit(Error) + end. + +%%%========================================================================== +%%% sys callbacks + +system_continue(Parent, Debug, S) -> + loop(Parent, Debug, S). + +system_terminate(Reason, _Parent, Debug, S) -> + ?TERMINATE(exit, Reason, Debug, S, []). + +system_code_change( + #{module := Module, + state := State, + data := Data} = S, + _Mod, OldVsn, Extra) -> + case + try Module:code_change(OldVsn, State, Data, Extra) + catch + Result -> Result + end + of + {NewCallbackMode,NewState,NewData} -> + callback_mode(NewCallbackMode) orelse + error({callback_mode,NewCallbackMode}), + {ok,S#{state := NewState, data := NewData}}; + {ok,_} = Error -> + error({case_clause,Error}); + Error -> + Error + end. + +system_get_state(#{state := State, data := Data}) -> + {ok,{State,Data}}. + +system_replace_state( + StateFun, + #{state := State, + data := Data} = S) -> + {NewState,NewData} = Result = StateFun({State,Data}), + {ok,Result,S#{state := NewState, data := NewData}}. + +format_status( + Opt, + [PDict,SysState,Parent,Debug, + #{name := Name, postponed := P} = S]) -> + Header = gen:format_status_header("Status for state machine", Name), + Log = sys:get_debug(log, Debug, []), + [{header,Header}, + {data, + [{"Status",SysState}, + {"Parent",Parent}, + {"Logged Events",Log}, + {"Postponed",P}]} | + case format_status(Opt, PDict, S) of + L when is_list(L) -> L; + T -> [T] + end]. + +%%--------------------------------------------------------------------------- +%% Format debug messages. Print them as the call-back module sees +%% them, not as the real erlang messages. Use trace for that. +%%--------------------------------------------------------------------------- + +print_event(Dev, {in,Event}, #{name := Name}) -> + io:format( + Dev, "*DBG* ~p received ~s~n", + [Name,event_string(Event)]); +print_event(Dev, {out,Reply,{To,_Tag}}, #{name := Name}) -> + io:format( + Dev, "*DBG* ~p sent ~p to ~p~n", + [Name,Reply,To]); +print_event(Dev, {Tag,Event,NewState}, #{name := Name, state := State}) -> + StateString = + case NewState of + State -> + io_lib:format("~p", [State]); + _ -> + io_lib:format("~p => ~p", [State,NewState]) + end, + io:format( + Dev, "*DBG* ~p ~w ~s in state ~s~n", + [Name,Tag,event_string(Event),StateString]). + +event_string(Event) -> + case Event of + {{call,{Pid,_Tag}},Request} -> + io_lib:format("call ~p from ~w", [Request,Pid]); + {Tag,Content} -> + io_lib:format("~w ~p", [Tag,Content]) + end. + +sys_debug(Debug, S, Entry) -> + case Debug of + [] -> + Debug; + _ -> + sys:handle_debug(Debug, fun print_event/3, S, Entry) + end. + +%%%========================================================================== +%%% Internal callbacks + +wakeup_from_hibernate(Parent, Debug, S) -> + %% It is a new message that woke us up so we have to receive it now + loop_receive(Parent, Debug, S). + +%%%========================================================================== +%%% State Machine engine implementation of proc_lib/gen server + +%% Server loop, consists of all loop* functions +%% and some detours through sys and proc_lib + +%% Entry point for system_continue/3 +loop(Parent, Debug, #{hibernate := Hib} = S) -> + case Hib of + true -> + %% Does not return but restarts process at + %% wakeup_from_hibernate/3 that jumps to loop_receive/3 + proc_lib:hibernate( + ?MODULE, wakeup_from_hibernate, [Parent,Debug,S]), + error( + {should_not_have_arrived_here_but_instead_in, + {wakeup_from_hibernate,3}}); + false -> + loop_receive(Parent, Debug, S) + end. + +%% Entry point for wakeup_from_hibernate/3 +loop_receive(Parent, Debug, #{timer := Timer} = S) -> + receive + Msg -> + case Msg of + {system,Pid,Req} -> + #{hibernate := Hibernate} = S, + %% Does not return but tail recursively calls + %% system_continue/3 that jumps to loop/3 + sys:handle_system_msg( + Req, Pid, Parent, ?MODULE, Debug, S, Hibernate); + {'EXIT',Parent,Reason} = EXIT -> + %% EXIT is not a 2-tuple and therefore + %% not an event and has no event_type(), + %% but this will stand out in the crash report... + ?TERMINATE(exit, Reason, Debug, S, [EXIT]); + {timeout,Timer,Content} when Timer =/= undefined -> + loop_event( + Parent, Debug, S, {timeout,Content}); + _ -> + %% Cancel Timer if running + case Timer of + undefined -> + ok; + _ -> + case erlang:cancel_timer(Timer) of + TimeLeft when is_integer(TimeLeft) -> + ok; + false -> + receive + {timeout,Timer,_} -> + ok + after 0 -> + ok + end + end + end, + Event = + case Msg of + {'$gen_call',From,Request} -> + {{call,From},Request}; + {'$gen_cast',E} -> + {cast,E}; + _ -> + {info,Msg} + end, + loop_event(Parent, Debug, S, Event) + end + end. + +loop_event(Parent, Debug, S, Event) -> + %% The timer field in S is now invalid and ignored + %% until we get back to loop/3 + NewDebug = sys_debug(Debug, S, {in,Event}), + %% Here the queue of not yet processed events is created + loop_events(Parent, NewDebug, S, [Event]). + +%% Process first the event queue, or if it is empty +%% loop back to receive a new event +loop_events(Parent, Debug, S, []) -> + loop(Parent, Debug, S); +loop_events( + Parent, Debug, + #{callback_mode := CallbackMode, + module := Module, + state := State, + data := Data} = S, + [{Type,Content} = Event|Events] = Q) -> + try + case CallbackMode of + state_functions -> + Module:State(Type, Content, Data); + handle_event_function -> + Module:handle_event(Type, Content, State, Data) + end of + Result -> + loop_event_result( + Parent, Debug, S, Events, Event, Result) + catch + Result -> + loop_event_result( + Parent, Debug, S, Events, Event, Result); + error:badarg when CallbackMode =:= state_functions -> + case erlang:get_stacktrace() of + [{erlang,apply,[Module,State,_],_}|Stacktrace] -> + Args = [Type,Content,Data], + terminate( + error, + {undef_state_function,{Module,State,Args}}, + Stacktrace, + Debug, S, Q); + Stacktrace -> + terminate(error, badarg, Stacktrace, Debug, S, Q) + end; + error:undef -> + %% Process an undef to check for the simple mistake + %% of calling a nonexistent state function + case erlang:get_stacktrace() of + [{Module,State, + [Type,Content,Data]=Args, + _} + |Stacktrace] + when CallbackMode =:= state_functions -> + terminate( + error, + {undef_state_function,{Module,State,Args}}, + Stacktrace, + Debug, S, Q); + [{Module,handle_event, + [Type,Content,State,Data]=Args, + _} + |Stacktrace] + when CallbackMode =:= handle_event_function -> + terminate( + error, + {undef_state_function, + {Module,handle_event,Args}}, + Stacktrace, + Debug, S, Q); + Stacktrace -> + terminate(error, undef, Stacktrace, Debug, S, Q) + end; + Class:Reason -> + Stacktrace = erlang:get_stacktrace(), + terminate(Class, Reason, Stacktrace, Debug, S, Q) + end. + +%% Interpret all callback return variants +loop_event_result( + Parent, Debug, + #{state := State, data := Data} = S, + Events, Event, Result) -> + case Result of + stop -> + ?TERMINATE(exit, normal, Debug, S, [Event|Events]); + {stop,Reason} -> + ?TERMINATE(exit, Reason, Debug, S, [Event|Events]); + {stop,Reason,NewData} -> + NewS = S#{data := NewData}, + Q = [Event|Events], + ?TERMINATE(exit, Reason, Debug, NewS, Q); + {stop_and_reply,Reason,Replies} -> + Q = [Event|Events], + [Class,NewReason,Stacktrace,NewDebug] = + reply_then_terminate( + exit, Reason, ?STACKTRACE(), Debug, S, Q, Replies), + %% Since we got back here Replies was bad + terminate(Class, NewReason, Stacktrace, NewDebug, S, Q); + {stop_and_reply,Reason,Replies,NewData} -> + NewS = S#{data := NewData}, + Q = [Event|Events], + [Class,NewReason,Stacktrace,NewDebug] = + reply_then_terminate( + exit, Reason, ?STACKTRACE(), Debug, NewS, Q, Replies), + %% Since we got back here Replies was bad + terminate(Class, NewReason, Stacktrace, NewDebug, NewS, Q); + {next_state,NextState,NewData} -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, []); + {next_state,NextState,NewData,Actions} -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions); + {keep_state,NewData} -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, State, NewData, []); + {keep_state,NewData,Actions} -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, State, NewData, Actions); + keep_state_and_data -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, State, Data, []); + {keep_state_and_data,Actions} -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, State, Data, Actions); + _ -> + ?TERMINATE( + error, {bad_return_value,Result}, Debug, S, [Event|Events]) + end. + +loop_event_actions( + Parent, Debug, S, Events, Event, State, NextState, NewData, Actions) -> + Postpone = false, % Shall we postpone this event, true or false + Hibernate = false, + Timeout = undefined, + NextEvents = [], + loop_event_actions( + Parent, Debug, S, Events, Event, State, NextState, NewData, + if + is_list(Actions) -> + Actions; + true -> + [Actions] + end, + Postpone, Hibernate, Timeout, NextEvents). +%% +%% Process all action()s +loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, [Action|Actions], + Postpone, Hibernate, Timeout, NextEvents) -> + case Action of + %% Actual actions + {reply,From,Reply} -> + case from(From) of + true -> + NewDebug = do_reply(Debug, S, From, Reply), + loop_event_actions( + Parent, NewDebug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, Hibernate, Timeout, NextEvents); + false -> + ?TERMINATE( + error, {bad_action,Action}, Debug, S, [Event|Events]) + end; + {next_event,Type,Content} -> + case event_type(Type) of + true -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, Hibernate, Timeout, + [{Type,Content}|NextEvents]); + false -> + ?TERMINATE( + error, {bad_action,Action}, Debug, S, [Event|Events]) + end; + %% Actions that set options + {postpone,NewPostpone} when is_boolean(NewPostpone) -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + NewPostpone, Hibernate, Timeout, NextEvents); + {postpone,_} -> + ?TERMINATE( + error, {bad_action,Action}, Debug, S, [Event|Events]); + postpone -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + true, Hibernate, Timeout, NextEvents); + {hibernate,NewHibernate} when is_boolean(NewHibernate) -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, NewHibernate, Timeout, NextEvents); + {hibernate,_} -> + ?TERMINATE( + error, {bad_action,Action}, Debug, S, [Event|Events]); + hibernate -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, true, Timeout, NextEvents); + {timeout,infinity,_} -> % Clear timer - it will never trigger + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, Hibernate, undefined, NextEvents); + {timeout,Time,_} = NewTimeout when is_integer(Time), Time >= 0 -> + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, Hibernate, NewTimeout, NextEvents); + {timeout,_,_} -> + ?TERMINATE( + error, {bad_action,Action}, Debug, S, [Event|Events]); + infinity -> % Clear timer - it will never trigger + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, Hibernate, undefined, NextEvents); + Time when is_integer(Time), Time >= 0 -> + NewTimeout = {timeout,Time,Time}, + loop_event_actions( + Parent, Debug, S, Events, Event, + State, NextState, NewData, Actions, + Postpone, Hibernate, NewTimeout, NextEvents); + _ -> + ?TERMINATE( + error, {bad_action,Action}, Debug, S, [Event|Events]) + end; +%% +%% End of actions list +loop_event_actions( + Parent, Debug, #{postponed := P0} = S, Events, Event, + State, NextState, NewData, [], + Postpone, Hibernate, Timeout, NextEvents) -> + %% + %% All options have been collected and next_events are buffered. + %% Do the actual state transition. + %% + P1 = % Move current event to postponed if Postpone + case Postpone of + true -> + [Event|P0]; + false -> + P0 + end, + {Q2,P} = % Move all postponed events to queue if state change + if + NextState =:= State -> + {Events,P1}; + true -> + {lists:reverse(P1, Events),[]} + end, + %% Place next events first in queue + Q3 = lists:reverse(NextEvents, Q2), + %% + NewDebug = + sys_debug( + Debug, S, + case Postpone of + true -> + {postpone,Event,NextState}; + false -> + {consume,Event,NextState} + end), + %% Have a peek on the event queue so we can avoid starting + %% the state timer unless we have to + {Q,Timer} = + case Timeout of + undefined -> + %% No state timeout has been requested + {Q3,undefined}; + {timeout,Time,EventContent} -> + %% A state timeout has been requested + case Q3 of + [] when Time =:= 0 -> + %% Immediate timeout - simulate it + %% so we do not get the timeout message + %% after any received event + {[{timeout,EventContent}],undefined}; + [] -> + %% Actually start a timer + {Q3,erlang:start_timer(Time, self(), EventContent)}; + _ -> + %% Do not start a timer since any queued + %% event cancels the state timer so we pretend + %% that the timer has been started and cancelled + {Q3,undefined} + end + end, + %% Loop to top of event queue loop; process next event + loop_events( + Parent, NewDebug, + S#{ + state := NextState, + data := NewData, + timer := Timer, + postponed := P, + hibernate := Hibernate}, + Q). + +%%--------------------------------------------------------------------------- +%% Server helpers + +reply_then_terminate(Class, Reason, Stacktrace, Debug, S, Q, Replies) -> + if + is_list(Replies) -> + do_reply_then_terminate( + Class, Reason, Stacktrace, Debug, S, Q, Replies); + true -> + do_reply_then_terminate( + Class, Reason, Stacktrace, Debug, S, Q, [Replies]) + end. +%% +do_reply_then_terminate(Class, Reason, Stacktrace, Debug, S, Q, []) -> + terminate(Class, Reason, Stacktrace, Debug, S, Q); +do_reply_then_terminate( + Class, Reason, Stacktrace, Debug, S, Q, [R|Rs]) -> + case R of + {reply,{_To,_Tag}=From,Reply} -> + NewDebug = do_reply(Debug, S, From, Reply), + do_reply_then_terminate( + Class, Reason, Stacktrace, NewDebug, S, Q, Rs); + _ -> + [error,{bad_action,R},?STACKTRACE(),Debug] + end. + +do_reply(Debug, S, From, Reply) -> + reply(From, Reply), + sys_debug(Debug, S, {out,Reply,From}). + + +terminate( + Class, Reason, Stacktrace, Debug, + #{module := Module, + state := State, data := Data} = S, + Q) -> + try Module:terminate(Reason, State, Data) of + _ -> ok + catch + _ -> ok; + C:R -> + ST = erlang:get_stacktrace(), + error_info( + C, R, ST, Debug, S, Q, + format_status(terminate, get(), S)), + erlang:raise(C, R, ST) + end, + case Reason of + normal -> ok; + shutdown -> ok; + {shutdown,_} -> ok; + _ -> + error_info( + Class, Reason, Stacktrace, Debug, S, Q, + format_status(terminate, get(), S)) + end, + case Stacktrace of + [] -> + erlang:Class(Reason); + _ -> + erlang:raise(Class, Reason, Stacktrace) + end. + +error_info( + Class, Reason, Stacktrace, Debug, + #{name := Name, callback_mode := CallbackMode, + state := State, postponed := P}, + Q, FmtData) -> + {FixedReason,FixedStacktrace} = + case Stacktrace of + [{M,F,Args,_}|ST] + when Class =:= error, Reason =:= undef -> + case code:is_loaded(M) of + false -> + {{'module could not be loaded',M},ST}; + _ -> + Arity = + if + is_list(Args) -> + length(Args); + is_integer(Args) -> + Args + end, + case erlang:function_exported(M, F, Arity) of + true -> + {Reason,Stacktrace}; + false -> + {{'function not exported',{M,F,Arity}}, + ST} + end + end; + _ -> {Reason,Stacktrace} + end, + error_logger:format( + "** State machine ~p terminating~n" ++ + case Q of + [] -> + ""; + _ -> + "** Last event = ~p~n" + end ++ + "** When Server state = ~p~n" ++ + "** Reason for termination = ~w:~p~n" ++ + "** State = ~p~n" ++ + "** Callback mode = ~p~n" ++ + "** Queued/Postponed = ~w/~w~n" ++ + case FixedStacktrace of + [] -> + ""; + _ -> + "** Stacktrace =~n" + "** ~p~n" + end, + [Name | + case Q of + [] -> + []; + [Event|_] -> + [Event] + end] ++ + [FmtData,Class,FixedReason, + State,CallbackMode,length(Q),length(P)] ++ + case FixedStacktrace of + [] -> + []; + _ -> + [FixedStacktrace] + end), + sys:print_log(Debug), + ok. + + +%% Call Module:format_status/2 or return a default value +format_status( + Opt, PDict, + #{module := Module, state := State, data := Data}) -> + case erlang:function_exported(Module, format_status, 2) of + true -> + try Module:format_status(Opt, [PDict,State,Data]) + catch + Result -> Result; + _:_ -> + format_status_default( + Opt, State, + "Module:format_status/2 crashed") + end; + false -> + format_status_default(Opt, State, Data) + end. + +%% The default Module:format_status/2 +format_status_default(Opt, State, Data) -> + SSD = {State,Data}, + case Opt of + terminate -> + SSD; + _ -> + [{data,[{"State",SSD}]}] + end. diff --git a/lib/stdlib/src/proc_lib.erl b/lib/stdlib/src/proc_lib.erl index c47d30c8b8..3f79ed0f87 100644 --- a/lib/stdlib/src/proc_lib.erl +++ b/lib/stdlib/src/proc_lib.erl @@ -472,13 +472,15 @@ trans_init(gen,init_it,[gen_server,_,_,supervisor_bridge,[Module|_],_]) -> {supervisor_bridge,Module,1}; trans_init(gen,init_it,[gen_server,_,_,_,supervisor_bridge,[Module|_],_]) -> {supervisor_bridge,Module,1}; -trans_init(gen,init_it,[gen_server,_,_,Module,_,_]) -> +trans_init(gen,init_it,[GenMod,_,_,Module,_,_]) + when GenMod =:= gen_server; + GenMod =:= gen_statem; + GenMod =:= gen_fsm -> {Module,init,1}; -trans_init(gen,init_it,[gen_server,_,_,_,Module|_]) -> - {Module,init,1}; -trans_init(gen,init_it,[gen_fsm,_,_,Module,_,_]) -> - {Module,init,1}; -trans_init(gen,init_it,[gen_fsm,_,_,_,Module|_]) -> +trans_init(gen,init_it,[GenMod,_,_,_,Module|_]) + when GenMod =:= gen_server; + GenMod =:= gen_statem; + GenMod =:= gen_fsm -> {Module,init,1}; trans_init(gen,init_it,[gen_event|_]) -> {gen_event,init_it,6}; diff --git a/lib/stdlib/src/stdlib.app.src b/lib/stdlib/src/stdlib.app.src index e3950ee795..32bcdc4f2a 100644 --- a/lib/stdlib/src/stdlib.app.src +++ b/lib/stdlib/src/stdlib.app.src @@ -65,6 +65,7 @@ gen_event, gen_fsm, gen_server, + gen_statem, io, io_lib, io_lib_format, diff --git a/lib/stdlib/test/Makefile b/lib/stdlib/test/Makefile index 287f63b2be..28c35aed55 100644 --- a/lib/stdlib/test/Makefile +++ b/lib/stdlib/test/Makefile @@ -46,6 +46,7 @@ MODULES= \ gen_event_SUITE \ gen_fsm_SUITE \ gen_server_SUITE \ + gen_statem_SUITE \ id_transform_SUITE \ io_SUITE \ io_proto_SUITE \ diff --git a/lib/stdlib/test/error_logger_forwarder.erl b/lib/stdlib/test/error_logger_forwarder.erl index 0aecd41ba9..6bbf180585 100644 --- a/lib/stdlib/test/error_logger_forwarder.erl +++ b/lib/stdlib/test/error_logger_forwarder.erl @@ -20,7 +20,7 @@ -module(error_logger_forwarder). %% API. --export([register/0]). +-export([register/0, unregister/0]). %% Internal export for error_logger. -export([init/1, @@ -33,6 +33,10 @@ register() -> error_logger:add_report_handler(?MODULE, self()). +unregister() -> + Self = self(), + Self = error_logger:delete_report_handler(?MODULE). + init(Tester) -> {ok,Tester}. diff --git a/lib/stdlib/test/gen_statem_SUITE.erl b/lib/stdlib/test/gen_statem_SUITE.erl new file mode 100644 index 0000000000..3deb5fd986 --- /dev/null +++ b/lib/stdlib/test/gen_statem_SUITE.erl @@ -0,0 +1,1578 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2016. All Rights Reserved. +%% +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at +%% +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. +%% +%% %CopyrightEnd% +%% +-module(gen_statem_SUITE). + +-include_lib("common_test/include/ct.hrl"). + +-compile(export_all). +-behaviour(gen_statem). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +suite() -> + [{ct_hooks,[ts_install_cth]}, + {timetrap,{minutes,1}}]. + +all() -> + [{group, start}, + {group, start_handle_event}, + {group, stop}, + {group, stop_handle_event}, + {group, abnormal}, + {group, abnormal_handle_event}, + shutdown, stop_and_reply, event_order, + {group, sys}, + hibernate, enter_loop]. + +groups() -> + [{start, [], + [start1, start2, start3, start4, start5, start6, start7, + start8, start9, start10, start11, start12, next_events]}, + {start_handle_event, [], + [start1, start2, start3, start4, start5, start6, start7, + start8, start9, start10, start11, start12, next_events]}, + {stop, [], + [stop1, stop2, stop3, stop4, stop5, stop6, stop7, stop8, stop9, stop10]}, + {stop_handle_event, [], + [stop1, stop2, stop3, stop4, stop5, stop6, stop7, stop8, stop9, stop10]}, + {abnormal, [], [abnormal1, abnormal2]}, + {abnormal_handle_event, [], [abnormal1, abnormal2]}, + {sys, [], + [sys1, code_change, + call_format_status, + error_format_status, terminate_crash_format, + get_state, replace_state]}, + {sys_handle_event, [], + [sys1, + call_format_status, + error_format_status, terminate_crash_format, + get_state, replace_state]}]. + +init_per_suite(Config) -> + Config. + +end_per_suite(_Config) -> + ok. + +init_per_group(GroupName, Config) + when GroupName =:= start_handle_event; + GroupName =:= stop_handle_event; + GroupName =:= abnormal_handle_event; + GroupName =:= sys_handle_event -> + [{callback_mode,handle_event_function}|Config]; +init_per_group(_GroupName, Config) -> + Config. + +end_per_group(_GroupName, Config) -> + Config. + +init_per_testcase(_CaseName, Config) -> + flush(), +%%% dbg:tracer(), +%%% dbg:p(all, c), +%%% dbg:tpl(gen_statem, cx), +%%% dbg:tpl(proc_lib, cx), +%%% dbg:tpl(gen, cx), +%%% dbg:tpl(sys, cx), + Config. + +end_per_testcase(_CaseName, Config) -> +%%% dbg:stop(), + Config. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +-define(EXPECT_FAILURE(Code, Reason), + try begin Code end of + Reason -> + ct:fail({unexpected,Reason}) + catch + error:Reason -> Reason; + exit:Reason -> Reason + end). +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +%% anonymous +start1(Config) -> + %%OldFl = process_flag(trap_exit, true), + + {ok,Pid0} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), + ok = do_func_test(Pid0), + ok = do_sync_func_test(Pid0), + stop_it(Pid0), +%% stopped = gen_statem:call(Pid0, stop), +%% timeout = +%% ?EXPECT_FAILURE(gen_statem:call(Pid0, hej), Reason), + + %%process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +%% anonymous w. shutdown +start2(Config) -> + %% Dont link when shutdown + {ok,Pid0} = gen_statem:start(?MODULE, start_arg(Config, []), []), + ok = do_func_test(Pid0), + ok = do_sync_func_test(Pid0), + stopped = gen_statem:call(Pid0, {stop,shutdown}), + check_stopped(Pid0), + ok = verify_empty_msgq(). + +%% anonymous with timeout +start3(Config) -> + %%OldFl = process_flag(trap_exit, true), + + {ok,Pid0} = + gen_statem:start(?MODULE, start_arg(Config, []), [{timeout,5}]), + ok = do_func_test(Pid0), + ok = do_sync_func_test(Pid0), + stop_it(Pid0), + + {error,timeout} = + gen_statem:start( + ?MODULE, start_arg(Config, sleep), [{timeout,5}]), + + %%process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +%% anonymous with ignore +start4(Config) -> + OldFl = process_flag(trap_exit, true), + + ignore = gen_statem:start(?MODULE, start_arg(Config, ignore), []), + + process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +%% anonymous with stop +start5(Config) -> + OldFl = process_flag(trap_exit, true), + + {error,stopped} = gen_statem:start(?MODULE, start_arg(Config, stop), []), + + process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +%% anonymous linked +start6(Config) -> + {ok,Pid} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), + ok = do_func_test(Pid), + ok = do_sync_func_test(Pid), + stop_it(Pid), + + ok = verify_empty_msgq(). + +%% global register linked +start7(Config) -> + STM = {global,my_stm}, + + {ok,Pid} = + gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + + ok = do_func_test(Pid), + ok = do_sync_func_test(Pid), + ok = do_func_test(STM), + ok = do_sync_func_test(STM), + stop_it(STM), + + ok = verify_empty_msgq(). + + +%% local register +start8(Config) -> + %%OldFl = process_flag(trap_exit, true), + Name = my_stm, + STM = {local,Name}, + + {ok,Pid} = + gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + + ok = do_func_test(Pid), + ok = do_sync_func_test(Pid), + ok = do_func_test(Name), + ok = do_sync_func_test(Name), + stop_it(Pid), + + %%process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +%% local register linked +start9(Config) -> + %%OldFl = process_flag(trap_exit, true), + Name = my_stm, + STM = {local,Name}, + + {ok,Pid} = + gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + + ok = do_func_test(Pid), + ok = do_sync_func_test(Pid), + ok = do_func_test(Name), + ok = do_sync_func_test(Name), + stop_it(Pid), + + %%process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +%% global register +start10(Config) -> + STM = {global,my_stm}, + + {ok,Pid} = + gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), + + ok = do_func_test(Pid), + ok = do_sync_func_test(Pid), + ok = do_func_test(STM), + ok = do_sync_func_test(STM), + stop_it(STM), + + ok = verify_empty_msgq(). + +%% Stop registered processes +start11(Config) -> + Name = my_stm, + LocalSTM = {local,Name}, + GlobalSTM = {global,Name}, + + {ok,Pid} = + gen_statem:start_link(LocalSTM, ?MODULE, start_arg(Config, []), []), + stop_it(Pid), + + {ok,_Pid1} = + gen_statem:start_link(LocalSTM, ?MODULE, start_arg(Config, []), []), + stop_it(Name), + + {ok,Pid2} = + gen_statem:start(GlobalSTM, ?MODULE, start_arg(Config, []), []), + stop_it(Pid2), + receive after 1 -> true end, + Result = + gen_statem:start(GlobalSTM, ?MODULE, start_arg(Config, []), []), + ct:log("Result = ~p~n",[Result]), + {ok,_Pid3} = Result, + stop_it(GlobalSTM), + + ok = verify_empty_msgq(). + +%% Via register linked +start12(Config) -> + dummy_via:reset(), + VIA = {via,dummy_via,my_stm}, + + {ok,Pid} = + gen_statem:start_link(VIA, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start_link(VIA, ?MODULE, start_arg(Config, []), []), + {error,{already_started,Pid}} = + gen_statem:start(VIA, ?MODULE, start_arg(Config, []), []), + + ok = do_func_test(Pid), + ok = do_sync_func_test(Pid), + ok = do_func_test(VIA), + ok = do_sync_func_test(VIA), + stop_it(VIA), + + ok = verify_empty_msgq(). + + +%% Anonymous, reason 'normal' +stop1(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + ok = gen_statem:stop(Pid), + false = erlang:is_process_alive(Pid), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason). + +%% Anonymous, other reason +stop2(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + ok = gen_statem:stop(Pid, other_reason, infinity), + false = erlang:is_process_alive(Pid), + ok. + +%% Anonymous, invalid timeout +stop3(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + _ = + ?EXPECT_FAILURE( + gen_statem:stop(Pid, other_reason, invalid_timeout), + Reason), + true = erlang:is_process_alive(Pid), + ok = gen_statem:stop(Pid), + false = erlang:is_process_alive(Pid), + ok. + +%% Registered name +stop4(Config) -> + {ok,Pid} = + gen_statem:start( + {local,to_stop},?MODULE, start_arg(Config, []), []), + ok = gen_statem:stop(to_stop), + false = erlang:is_process_alive(Pid), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(to_stop), Reason), + ok. + +%% Registered name and local node +stop5(Config) -> + Name = to_stop, + {ok,Pid} = + gen_statem:start( + {local,Name},?MODULE, start_arg(Config, []), []), + ok = gen_statem:stop({Name,node()}), + false = erlang:is_process_alive(Pid), + noproc = + ?EXPECT_FAILURE(gen_statem:stop({Name,node()}), Reason), + ok. + +%% Globally registered name +stop6(Config) -> + STM = {global,to_stop}, + {ok,Pid} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), + ok = gen_statem:stop(STM), + false = erlang:is_process_alive(Pid), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(STM), Reason), + ok. + +%% 'via' registered name +stop7(Config) -> + VIA = {via,dummy_via,to_stop}, + dummy_via:reset(), + {ok,Pid} = gen_statem:start(VIA, ?MODULE, start_arg(Config, []), []), + ok = gen_statem:stop(VIA), + false = erlang:is_process_alive(Pid), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(VIA), Reason), + ok. + +%% Anonymous on remote node +stop8(Config) -> + Node = gen_statem_stop8, + {ok,NodeName} = ct_slave:start(Node), + Dir = filename:dirname(code:which(?MODULE)), + rpc:call(NodeName, code, add_path, [Dir]), + {ok,Pid} = + rpc:call( + NodeName, gen_statem,start, + [?MODULE,start_arg(Config, []),[]]), + ok = gen_statem:stop(Pid), + false = rpc:call(NodeName, erlang, is_process_alive, [Pid]), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason1), + {ok,NodeName} = ct_slave:stop(Node), + {{nodedown,NodeName},{sys,terminate,_}} = + ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason2), + ok. + +%% Registered name on remote node +stop9(Config) -> + Name = to_stop, + LocalSTM = {local,Name}, + Node = gen_statem__stop9, + {ok,NodeName} = ct_slave:start(Node), + STM = {Name,NodeName}, + Dir = filename:dirname(code:which(?MODULE)), + rpc:call(NodeName, code, add_path, [Dir]), + {ok,Pid} = + rpc:call( + NodeName, gen_statem, start, + [LocalSTM,?MODULE,start_arg(Config, []),[]]), + ok = gen_statem:stop(STM), + undefined = rpc:call(NodeName,erlang,whereis,[Name]), + false = rpc:call(NodeName,erlang,is_process_alive,[Pid]), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(STM), Reason1), + {ok,NodeName} = ct_slave:stop(Node), + {{nodedown,NodeName},{sys,terminate,_}} = + ?EXPECT_FAILURE(gen_statem:stop(STM), Reason2), + ok. + +%% Globally registered name on remote node +stop10(Config) -> + Node = gen_statem_stop10, + STM = {global,to_stop}, + {ok,NodeName} = ct_slave:start(Node), + Dir = filename:dirname(code:which(?MODULE)), + rpc:call(NodeName,code,add_path,[Dir]), + {ok,Pid} = + rpc:call( + NodeName, gen_statem, start, + [STM,?MODULE,start_arg(Config, []),[]]), + global:sync(), + ok = gen_statem:stop(STM), + false = rpc:call(NodeName, erlang, is_process_alive, [Pid]), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(STM), Reason1), + {ok,NodeName} = ct_slave:stop(Node), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(STM), Reason2), + ok. + +%% Check that time outs in calls work +abnormal1(Config) -> + Name = abnormal1, + LocalSTM = {local,Name}, + + {ok, _Pid} = + gen_statem:start(LocalSTM, ?MODULE, start_arg(Config, []), []), + + %% timeout call. + delayed = gen_statem:call(Name, {delayed_answer,1}, 100), + {timeout,_} = + ?EXPECT_FAILURE( + gen_statem:call(Name, {delayed_answer,1000}, 10), + Reason), + ok = gen_statem:stop(Name), + ok = verify_empty_msgq(). + +%% Check that bad return values makes the stm crash. Note that we must +%% trap exit since we must link to get the real bad_return_ error +abnormal2(Config) -> + OldFl = process_flag(trap_exit, true), + {ok,Pid} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), + + %% bad return value in the gen_statem loop + {{bad_return_value,badreturn},_} = + ?EXPECT_FAILURE(gen_statem:call(Pid, badreturn), Reason), + receive + {'EXIT',Pid,{bad_return_value,badreturn}} -> ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + process_flag(trap_exit, OldFl), + ok = verify_empty_msgq(). + +shutdown(Config) -> + process_flag(trap_exit, true), + + {ok,Pid0} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), + ok = do_func_test(Pid0), + ok = do_sync_func_test(Pid0), + stopped = gen_statem:call(Pid0, {stop,{shutdown,reason}}), + receive {'EXIT',Pid0,{shutdown,reason}} -> ok end, + process_flag(trap_exit, false), + + {noproc,_} = + ?EXPECT_FAILURE(gen_statem:call(Pid0, hej), Reason), + + receive + Any -> + ct:log("Unexpected: ~p", [Any]), + ct:fail({unexpected,Any}) + after 500 -> + ok + end. + + + +stop_and_reply(_Config) -> + process_flag(trap_exit, true), + + Machine = + %% Abusing the internal format of From... + #{init => + fun () -> + {ok,start,undefined} + end, + start => + fun (cast, {echo,From1,Reply1}, undefined) -> + {next_state,wait,{reply,From1,Reply1}} + end, + wait => + fun (cast, {stop_and_reply,Reason,From2,Reply2},R1) -> + {stop_and_reply,Reason, + [R1,{reply,From2,Reply2}]} + end}, + {ok,STM} = gen_statem:start_link(?MODULE, {map_statem,Machine}, []), + + Self = self(), + Tag1 = make_ref(), + gen_statem:cast(STM, {echo,{Self,Tag1},reply1}), + Tag2 = make_ref(), + gen_statem:cast(STM, {stop_and_reply,reason,{Self,Tag2},reply2}), + case flush() of + [{Tag1,reply1},{Tag2,reply2},{'EXIT',STM,reason}] -> + ok; + Other1 -> + ct:fail({unexpected,Other1}) + end, + + {noproc,_} = + ?EXPECT_FAILURE(gen_statem:call(STM, hej), Reason), + case flush() of + [] -> + ok; + Other2 -> + ct:fail({unexpected,Other2}) + end. + + + +event_order(_Config) -> + process_flag(trap_exit, true), + + Machine = + %% Abusing the internal format of From... + #{init => + fun () -> + {ok,start,undefined} + end, + start => + fun (cast, _, _) -> + {keep_state_and_data,postpone}; %% Handled in 'buffer' + ({call,From}, {buffer,Pid,[Tag3,Tag4,Tag5]}, + undefined) -> + {next_state,buffer,[], + [{next_event,internal,{reply,{Pid,Tag3},ok3}}, + {next_event,internal,{reply,{Pid,Tag4},ok4}}, + {timeout,0,{reply,{Pid,Tag5},ok5}}, + %% The timeout should not happen since there + %% are events that cancel it i.e next_event + %% and postponed + {reply,From,ok}]} + end, + buffer => + fun (internal, Reply, Replies) -> + {keep_state,[Reply|Replies]}; + (timeout, Reply, Replies) -> + {keep_state,[Reply|Replies]}; + (cast, Reply, Replies) -> + {keep_state,[Reply|Replies]}; + ({call,From}, {stop,Reason}, Replies) -> + {next_state,stop,undefined, + lists:reverse( + Replies, + [{reply,From,ok}, + {next_event,internal,{stop,Reason}}])} + end, + stop => + fun (internal, Result, undefined) -> + Result + end}, + + {ok,STM} = gen_statem:start_link(?MODULE, {map_statem,Machine}, []), + Self = self(), + Tag1 = make_ref(), + gen_statem:cast(STM, {reply,{Self,Tag1},ok1}), + Tag2 = make_ref(), + gen_statem:cast(STM, {reply,{Self,Tag2},ok2}), + Tag3 = make_ref(), + Tag4 = make_ref(), + Tag5 = make_ref(), + ok = gen_statem:call(STM, {buffer,Self,[Tag3,Tag4,Tag5]}), + ok = gen_statem:call(STM, {stop,reason}), + case flush() of + [{Tag3,ok3},{Tag4,ok4},{Tag1,ok1},{Tag2,ok2}, + {'EXIT',STM,reason}] -> + ok; + Other1 -> + ct:fail({unexpected,Other1}) + end, + + {noproc,_} = + ?EXPECT_FAILURE(gen_statem:call(STM, hej), Reason), + case flush() of + [] -> + ok; + Other2 -> + ct:fail({unexpected,Other2}) + end. + + + +sys1(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + {status, Pid, {module,gen_statem}, _} = sys:get_status(Pid), + sys:suspend(Pid), + Parent = self(), + Tag = make_ref(), + Caller = + spawn( + fun () -> + Parent ! {Tag,gen_statem:call(Pid, hej)} + end), + receive + {Tag,_} -> + ct:fail(should_be_suspended) + after 3000 -> + exit(Caller, ok) + end, + + %% {timeout,_} = + %% ?EXPECT_FAILURE(gen_statem:call(Pid, hej), Reason), + sys:resume(Pid), + stop_it(Pid). + +code_change(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + {idle,data} = sys:get_state(Pid), + sys:suspend(Pid), + sys:change_code(Pid, ?MODULE, old_vsn, state_functions), + sys:resume(Pid), + {idle,{old_vsn,data,state_functions}} = sys:get_state(Pid), + stop_it(Pid). + +call_format_status(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + Status = sys:get_status(Pid), + {status,Pid,_Mod,[_PDict,running,_,_, Data]} = Status, + [format_status_called|_] = lists:reverse(Data), + stop_it(Pid), + + %% check that format_status can handle a name being an atom (pid is + %% already checked by the previous test) + {ok, Pid2} = + gen_statem:start( + {local, gstm}, ?MODULE, start_arg(Config, []), []), + Status2 = sys:get_status(gstm), + {status,Pid2,_Mod,[_PDict2,running,_,_,Data2]} = Status2, + [format_status_called|_] = lists:reverse(Data2), + stop_it(Pid2), + + %% check that format_status can handle a name being a term other than a + %% pid or atom + GlobalName1 = {global,"CallFormatStatus"}, + {ok,Pid3} = + gen_statem:start( + GlobalName1, ?MODULE, start_arg(Config, []), []), + Status3 = sys:get_status(GlobalName1), + {status,Pid3,_Mod,[_PDict3,running,_,_,Data3]} = Status3, + [format_status_called|_] = lists:reverse(Data3), + stop_it(Pid3), + GlobalName2 = {global,{name, "term"}}, + {ok,Pid4} = + gen_statem:start( + GlobalName2, ?MODULE, start_arg(Config, []), []), + Status4 = sys:get_status(GlobalName2), + {status,Pid4,_Mod,[_PDict4,running,_,_, Data4]} = Status4, + [format_status_called|_] = lists:reverse(Data4), + stop_it(Pid4), + + %% check that format_status can handle a name being a term other than a + %% pid or atom + dummy_via:reset(), + ViaName1 = {via,dummy_via,"CallFormatStatus"}, + {ok,Pid5} = gen_statem:start(ViaName1, ?MODULE, start_arg(Config, []), []), + Status5 = sys:get_status(ViaName1), + {status,Pid5,_Mod, [_PDict5,running,_,_, Data5]} = Status5, + [format_status_called|_] = lists:reverse(Data5), + stop_it(Pid5), + ViaName2 = {via,dummy_via,{name,"term"}}, + {ok, Pid6} = + gen_statem:start( + ViaName2, ?MODULE, start_arg(Config, []), []), + Status6 = sys:get_status(ViaName2), + {status,Pid6,_Mod,[_PDict6,running,_,_,Data6]} = Status6, + [format_status_called|_] = lists:reverse(Data6), + stop_it(Pid6). + + + +error_format_status(Config) -> + error_logger_forwarder:register(), + OldFl = process_flag(trap_exit, true), + Data = "called format_status", + {ok,Pid} = + gen_statem:start( + ?MODULE, start_arg(Config, {data,Data}), []), + %% bad return value in the gen_statem loop + {{bad_return_value,badreturn},_} = + ?EXPECT_FAILURE(gen_statem:call(Pid, badreturn), Reason), + receive + {error,_, + {Pid, + "** State machine"++_, + [Pid,{{call,_},badreturn}, + {formatted,idle,Data}, + error,{bad_return_value,badreturn}|_]}} -> + ok; + Other when is_tuple(Other), element(1, Other) =:= error -> + error_logger_forwarder:unregister(), + ct:fail({unexpected,Other}) + after 1000 -> + error_logger_forwarder:unregister(), + ct:fail(timeout) + end, + process_flag(trap_exit, OldFl), + error_logger_forwarder:unregister(), + receive + %% Comes with SASL + {error_report,_,{Pid,crash_report,_}} -> + ok + after 500 -> + ok + end, + ok = verify_empty_msgq(). + +terminate_crash_format(Config) -> + error_logger_forwarder:register(), + OldFl = process_flag(trap_exit, true), + Data = crash_terminate, + {ok,Pid} = + gen_statem:start( + ?MODULE, start_arg(Config, {data,Data}), []), + stop_it(Pid), + Self = self(), + receive + {error,_GroupLeader, + {Pid, + "** State machine"++_, + [Pid, + {{call,{Self,_}},stop}, + {formatted,idle,Data}, + exit,{crash,terminate}|_]}} -> + ok; + Other when is_tuple(Other), element(1, Other) =:= error -> + error_logger_forwarder:unregister(), + ct:fail({unexpected,Other}) + after 1000 -> + error_logger_forwarder:unregister(), + ct:fail(timeout) + end, + process_flag(trap_exit, OldFl), + error_logger_forwarder:unregister(), + receive + %% Comes with SASL + {error_report,_,{Pid,crash_report,_}} -> + ok + after 500 -> + ok + end, + ok = verify_empty_msgq(). + + +get_state(Config) -> + State = self(), + {ok,Pid} = + gen_statem:start( + ?MODULE, start_arg(Config, {data,State}), []), + {idle,State} = sys:get_state(Pid), + {idle,State} = sys:get_state(Pid, 5000), + stop_it(Pid), + + %% check that get_state can handle a name being an atom (pid is + %% already checked by the previous test) + {ok,Pid2} = + gen_statem:start( + {local,gstm}, ?MODULE, start_arg(Config, {data,State}), []), + {idle,State} = sys:get_state(gstm), + {idle,State} = sys:get_state(gstm, 5000), + stop_it(Pid2), + + %% check that get_state works when pid is sys suspended + {ok,Pid3} = + gen_statem:start( + ?MODULE, start_arg(Config, {data,State}), []), + {idle,State} = sys:get_state(Pid3), + ok = sys:suspend(Pid3), + {idle,State} = sys:get_state(Pid3, 5000), + ok = sys:resume(Pid3), + stop_it(Pid3), + ok = verify_empty_msgq(). + +replace_state(Config) -> + State = self(), + {ok, Pid} = + gen_statem:start( + ?MODULE, start_arg(Config, {data,State}), []), + {idle,State} = sys:get_state(Pid), + NState1 = "replaced", + Replace1 = fun({StateName, _}) -> {StateName,NState1} end, + {idle,NState1} = sys:replace_state(Pid, Replace1), + {idle,NState1} = sys:get_state(Pid), + NState2 = "replaced again", + Replace2 = fun({idle, _}) -> {state0,NState2} end, + {state0,NState2} = sys:replace_state(Pid, Replace2, 5000), + {state0,NState2} = sys:get_state(Pid), + %% verify no change in state if replace function crashes + Replace3 = fun(_) -> error(fail) end, + {callback_failed, + {gen_statem,system_replace_state},{error,fail}} = + ?EXPECT_FAILURE(sys:replace_state(Pid, Replace3), Reason), + {state0, NState2} = sys:get_state(Pid), + %% verify state replaced if process sys suspended + ok = sys:suspend(Pid), + Suffix2 = " and again", + NState3 = NState2 ++ Suffix2, + Replace4 = fun({StateName, _}) -> {StateName, NState3} end, + {state0,NState3} = sys:replace_state(Pid, Replace4), + ok = sys:resume(Pid), + {state0,NState3} = sys:get_state(Pid, 5000), + stop_it(Pid), + ok = verify_empty_msgq(). + +%% Hibernation +hibernate(Config) -> + OldFl = process_flag(trap_exit, true), + + {ok,Pid0} = + gen_statem:start_link( + ?MODULE, start_arg(Config, hiber_now), []), + is_in_erlang_hibernate(Pid0), + stop_it(Pid0), + receive + {'EXIT',Pid0,normal} -> ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + {ok,Pid} = + gen_statem:start_link(?MODULE, start_arg(Config, hiber), []), + true = ({current_function,{erlang,hibernate,3}} =/= + erlang:process_info(Pid,current_function)), + hibernating = gen_statem:call(Pid, hibernate_sync), + is_in_erlang_hibernate(Pid), + good_morning = gen_statem:call(Pid, wakeup_sync), + is_not_in_erlang_hibernate(Pid), + hibernating = gen_statem:call(Pid, hibernate_sync), + is_in_erlang_hibernate(Pid), + please_just_five_more = gen_statem:call(Pid, snooze_sync), + is_in_erlang_hibernate(Pid), + good_morning = gen_statem:call(Pid, wakeup_sync), + is_not_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, hibernate_async), + is_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, wakeup_async), + is_not_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, hibernate_async), + is_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, snooze_async), + is_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, wakeup_async), + is_not_in_erlang_hibernate(Pid), + + Pid ! hibernate_later, + true = + ({current_function,{erlang,hibernate,3}} =/= + erlang:process_info(Pid, current_function)), + is_in_erlang_hibernate(Pid), + + 'alive!' = gen_statem:call(Pid, 'alive?'), + true = + ({current_function,{erlang,hibernate,3}} =/= + erlang:process_info(Pid, current_function)), + Pid ! hibernate_now, + is_in_erlang_hibernate(Pid), + + 'alive!' = gen_statem:call(Pid, 'alive?'), + true = + ({current_function,{erlang,hibernate,3}} =/= + erlang:process_info(Pid, current_function)), + + hibernating = gen_statem:call(Pid, hibernate_sync), + is_in_erlang_hibernate(Pid), + good_morning = gen_statem:call(Pid, wakeup_sync), + is_not_in_erlang_hibernate(Pid), + hibernating = gen_statem:call(Pid, hibernate_sync), + is_in_erlang_hibernate(Pid), + please_just_five_more = gen_statem:call(Pid, snooze_sync), + is_in_erlang_hibernate(Pid), + good_morning = gen_statem:call(Pid, wakeup_sync), + is_not_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, hibernate_async), + is_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, wakeup_async), + is_not_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, hibernate_async), + is_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, snooze_async), + is_in_erlang_hibernate(Pid), + ok = gen_statem:cast(Pid, wakeup_async), + is_not_in_erlang_hibernate(Pid), + + hibernating = gen_statem:call(Pid, hibernate_sync), + is_in_erlang_hibernate(Pid), + sys:suspend(Pid), + is_in_erlang_hibernate(Pid), + sys:resume(Pid), + is_in_erlang_hibernate(Pid), + receive after 1000 -> ok end, + is_in_erlang_hibernate(Pid), + + good_morning = gen_statem:call(Pid, wakeup_sync), + is_not_in_erlang_hibernate(Pid), + stop_it(Pid), + process_flag(trap_exit, OldFl), + receive + {'EXIT',Pid,normal} -> ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + ok = verify_empty_msgq(). + +is_in_erlang_hibernate(Pid) -> + receive after 1 -> ok end, + is_in_erlang_hibernate_1(200, Pid). + +is_in_erlang_hibernate_1(0, Pid) -> + ct:log("~p\n", [erlang:process_info(Pid, current_function)]), + ct:fail(not_in_erlang_hibernate_3); +is_in_erlang_hibernate_1(N, Pid) -> + {current_function,MFA} = erlang:process_info(Pid, current_function), + case MFA of + {erlang,hibernate,3} -> + ok; + _ -> + receive after 10 -> ok end, + is_in_erlang_hibernate_1(N-1, Pid) + end. + +is_not_in_erlang_hibernate(Pid) -> + receive after 1 -> ok end, + is_not_in_erlang_hibernate_1(200, Pid). + +is_not_in_erlang_hibernate_1(0, Pid) -> + ct:log("~p\n", [erlang:process_info(Pid, current_function)]), + ct:fail(not_in_erlang_hibernate_3); +is_not_in_erlang_hibernate_1(N, Pid) -> + {current_function,MFA} = erlang:process_info(Pid, current_function), + case MFA of + {erlang,hibernate,3} -> + receive after 10 -> ok end, + is_not_in_erlang_hibernate_1(N-1, Pid); + _ -> + ok + end. + + +enter_loop(_Config) -> + OldFlag = process_flag(trap_exit, true), + + dummy_via:reset(), + + %% Locally registered process + {local,Name} + {ok,Pid1a} = + proc_lib:start_link(?MODULE, enter_loop, [local,local]), + yes = gen_statem:call(Pid1a, 'alive?'), + stopped = gen_statem:call(Pid1a, stop), + receive + {'EXIT',Pid1a,normal} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Unregistered process + {local,Name} + {ok,Pid1b} = + proc_lib:start_link(?MODULE, enter_loop, [anon,local]), + receive + {'EXIT',Pid1b,process_not_registered} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Globally registered process + {global,Name} + {ok,Pid2a} = + proc_lib:start_link(?MODULE, enter_loop, [global,global]), + yes = gen_statem:call(Pid2a, 'alive?'), + stopped = gen_statem:call(Pid2a, stop), + receive + {'EXIT',Pid2a,normal} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Unregistered process + {global,Name} + {ok,Pid2b} = + proc_lib:start_link(?MODULE, enter_loop, [anon,global]), + receive + {'EXIT',Pid2b,process_not_registered_globally} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Unregistered process + no name + {ok,Pid3} = + proc_lib:start_link(?MODULE, enter_loop, [anon,anon]), + yes = gen_statem:call(Pid3, 'alive?'), + stopped = gen_statem:call(Pid3, stop), + receive + {'EXIT',Pid3,normal} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Process not started using proc_lib + CallbackMode = state_functions, + Pid4 = + spawn_link( + gen_statem, enter_loop, + [?MODULE,[],CallbackMode,state0,[]]), + receive + {'EXIT',Pid4,process_was_not_started_by_proc_lib} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Make sure I am the parent, ie that ordering a shutdown will + %% result in the process terminating with Reason==shutdown + {ok,Pid5} = + proc_lib:start_link(?MODULE, enter_loop, [anon,anon]), + yes = gen_statem:call(Pid5, 'alive?'), + exit(Pid5, shutdown), + receive + {'EXIT',Pid5,shutdown} -> + ok + after 5000 -> + ct:fail(gen_statem_did_not_die) + end, + + %% Make sure gen_statem:enter_loop does not accept {local,Name} + %% when it's another process than the calling one which is + %% registered under that name + register(armitage, self()), + {ok,Pid6a} = + proc_lib:start_link(?MODULE, enter_loop, [anon,local]), + receive + {'EXIT',Pid6a,process_not_registered} -> + ok + after 1000 -> + ct:fail(gen_statem_started) + end, + unregister(armitage), + + %% Make sure gen_statem:enter_loop does not accept {global,Name} + %% when it's another process than the calling one which is + %% registered under that name + global:register_name(armitage, self()), + {ok,Pid6b} = + proc_lib:start_link(?MODULE, enter_loop, [anon,global]), + receive + {'EXIT',Pid6b,process_not_registered_globally} -> + ok + after 1000 -> + ct:fail(gen_statem_started) + end, + global:unregister_name(armitage), + + dummy_via:register_name(armitage, self()), + {ok,Pid6c} = + proc_lib:start_link(?MODULE, enter_loop, [anon,via]), + receive + {'EXIT',Pid6c,{process_not_registered_via,dummy_via}} -> + ok + after 1000 -> + ct:fail( + {gen_statem_started, + process_info(self(), messages)}) + end, + dummy_via:unregister_name(armitage), + + process_flag(trap_exit, OldFlag), + ok = verify_empty_msgq(). + +enter_loop(Reg1, Reg2) -> + process_flag(trap_exit, true), + case Reg1 of + local -> register(armitage, self()); + global -> global:register_name(armitage, self()); + via -> dummy_via:register_name(armitage, self()); + anon -> ignore + end, + proc_lib:init_ack({ok, self()}), + CallbackMode = state_functions, + case Reg2 of + local -> + gen_statem:enter_loop( + ?MODULE, [], CallbackMode, state0, [], {local,armitage}); + global -> + gen_statem:enter_loop( + ?MODULE, [], CallbackMode, state0, [], {global,armitage}); + via -> + gen_statem:enter_loop( + ?MODULE, [], CallbackMode, state0, [], + {via, dummy_via, armitage}); + anon -> + gen_statem:enter_loop( + ?MODULE, [], CallbackMode, state0, []) + end. + + +%% Test the order for multiple {next_event,T,C} +next_events(Config) -> + {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), + ok = gen_statem:cast(Pid, next_event), + {state,next_events,[]} = gen_statem:call(Pid, get), + ok = gen_statem:stop(Pid), + false = erlang:is_process_alive(Pid), + noproc = + ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason). + + +%% +%% Functionality check +%% + +wfor(Msg) -> + receive + Msg -> ok + after 5000 -> + error(timeout) + end. + + +stop_it(STM) -> + stopped = gen_statem:call(STM, stop), + check_stopped(STM). + + +check_stopped(STM) -> + Call = there_you_are, + {_,{gen_statem,call,[_,Call,infinity]}} = + ?EXPECT_FAILURE(gen_statem:call(STM, Call), Reason), + ok. + + +do_func_test(STM) -> + ok = gen_statem:cast(STM, {'alive?',self()}), + wfor(yes), + ok = do_connect(STM), + ok = gen_statem:cast(STM, {'alive?',self()}), + wfor(yes), + ?t:do_times(3, ?MODULE, do_msg, [STM]), + ok = gen_statem:cast(STM, {'alive?',self()}), + wfor(yes), + ok = do_disconnect(STM), + ok = gen_statem:cast(STM, {'alive?',self()}), + wfor(yes), + ok. + + +do_connect(STM) -> + check_state(STM, idle), + gen_statem:cast(STM, {connect,self()}), + wfor(accept), + check_state(STM, wfor_conf), + Tag = make_ref(), + gen_statem:cast(STM, {ping,self(),Tag}), + gen_statem:cast(STM, confirm), + wfor({pong,Tag}), + check_state(STM, connected), + ok. + +do_msg(STM) -> + check_state(STM, connected), + R = make_ref(), + ok = gen_statem:cast(STM, {msg,self(),R}), + wfor({ack,R}). + + +do_disconnect(STM) -> + ok = gen_statem:cast(STM, disconnect), + check_state(STM, idle). + +check_state(STM, State) -> + case gen_statem:call(STM, get) of + {state, State, _} -> ok + end. + +do_sync_func_test(STM) -> + yes = gen_statem:call(STM, 'alive?'), + ok = do_sync_connect(STM), + yes = gen_statem:call(STM, 'alive?'), + ?t:do_times(3, ?MODULE, do_sync_msg, [STM]), + yes = gen_statem:call(STM, 'alive?'), + ok = do_sync_disconnect(STM), + yes = gen_statem:call(STM, 'alive?'), + check_state(STM, idle), + ok = gen_statem:call(STM, {timeout,200}), + yes = gen_statem:call(STM, 'alive?'), + check_state(STM, idle), + ok. + + +do_sync_connect(STM) -> + check_state(STM, idle), + accept = gen_statem:call(STM, connect), + check_state(STM, wfor_conf), + Tag = make_ref(), + gen_statem:cast(STM, {ping,self(),Tag}), + yes = gen_statem:call(STM, confirm), + wfor({pong,Tag}), + check_state(STM, connected), + ok. + +do_sync_msg(STM) -> + check_state(STM, connected), + R = make_ref(), + {ack,R} = gen_statem:call(STM, {msg,R}), + ok. + +do_sync_disconnect(STM) -> + yes = gen_statem:call(STM, disconnect), + check_state(STM, idle). + + +verify_empty_msgq() -> + [] = flush(), + ok. + +start_arg(Config, Arg) -> + case lists:keyfind(callback_mode, 1, Config) of + {_,CallbackMode} -> + {callback_mode,CallbackMode,Arg}; + false -> + Arg + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% +%% The State Machine +%% +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +init(ignore) -> + ignore; +init(stop) -> + {stop,stopped}; +init(stop_shutdown) -> + {stop,shutdown}; +init(sleep) -> + ?t:sleep(1000), + {state_functions,idle,data}; +init(hiber) -> + {state_functions,hiber_idle,[]}; +init(hiber_now) -> + {state_functions,hiber_idle,[],[hibernate]}; +init({data, Data}) -> + {state_functions,idle,Data}; +init({callback_mode,CallbackMode,Arg}) -> + case init(Arg) of + {_,State,Data,Ops} -> + {CallbackMode,State,Data,Ops}; + {_,State,Data} -> + {CallbackMode,State,Data}; + Other -> + Other + end; +init({map_statem,#{init := Init}=Machine}) -> + case Init() of + {ok,State,Data,Ops} -> + {handle_event_function,State,[Data|Machine],Ops}; + {ok,State,Data} -> + {handle_event_function,State,[Data|Machine]}; + Other -> + Other + end; +init([]) -> + {state_functions,idle,data}. + +terminate(_, _State, crash_terminate) -> + exit({crash,terminate}); +terminate({From,stopped}, State, _Data) -> + From ! {self(),{stopped,State}}, + ok; +terminate(_Reason, _State, _Data) -> + ok. + + +%% State functions + +idle(cast, {connect,Pid}, Data) -> + Pid ! accept, + {next_state,wfor_conf,Data,infinity}; % NoOp timeout just to test API +idle({call,From}, connect, Data) -> + gen_statem:reply(From, accept), + {next_state,wfor_conf,Data,infinity}; % NoOp timeout just to test API +idle(cast, badreturn, _Data) -> + badreturn; +idle({call,_From}, badreturn, _Data) -> + badreturn; +idle({call,From}, {delayed_answer,T}, Data) -> + receive + after T -> + gen_statem:reply({reply,From,delayed}), + throw({keep_state,Data}) + end; +idle({call,From}, {timeout,Time}, _Data) -> + {next_state,timeout,{From,Time}, + {timeout,Time,idle}}; +idle(cast, next_event, _Data) -> + {next_state,next_events,[a,b,c], + [{next_event,internal,a}, + {next_event,internal,b}, + {next_event,internal,c}]}; +idle(Type, Content, Data) -> + case handle_common_events(Type, Content, idle, Data) of + undefined -> + case Type of + {call,From} -> + throw({keep_state,Data,[{reply,From,'eh?'}]}); + _ -> + throw( + {stop,{unexpected,idle,Type,Content}}) + end; + Result -> + Result + end. + +timeout(timeout, idle, {From,Time}) -> + TRef = erlang:start_timer(Time, self(), ok), + {keep_state,{From,TRef},0}; % Immediate timeout 0 +timeout(timeout, 0, {From,TRef}) -> + {next_state,timeout2,{From,TRef}, + [{timeout,1,should_be_cancelled}, + postpone]}; % Should cancel state timeout +timeout(_, _, _) -> + keep_state_and_data. + +timeout2(timeout, 0, _) -> + keep_state_and_data; +timeout2(timeout, Reason, _) -> + {stop,Reason}; +timeout2(info, {timeout,TRef,Result}, {From,TRef}) -> + gen_statem:reply([{reply,From,Result}]), + {next_state,idle,state}; +timeout2(_, _, _) -> + {keep_state_and_data,[]}. + +wfor_conf({call,From}, confirm, Data) -> + {next_state,connected,Data, + {reply,From,yes}}; +wfor_conf(cast, {ping,_,_}, _) -> + {keep_state_and_data,[postpone]}; +wfor_conf(cast, confirm, Data) -> + {next_state,connected,Data}; +wfor_conf(Type, Content, Data) -> + case handle_common_events(Type, Content, wfor_conf, Data) of + undefined -> + case Type of + {call,From} -> + {next_state,idle,Data, + [{reply,From,'eh?'}]}; + _ -> + throw(keep_state_and_data) + end; + Result -> + Result + end. + +connected({call,From}, {msg,Ref}, Data) -> + {keep_state,Data, + {reply,From,{ack,Ref}}}; +connected(cast, {msg,From,Ref}, Data) -> + From ! {ack,Ref}, + {keep_state,Data}; +connected({call,From}, disconnect, Data) -> + {next_state,idle,Data, + [{reply,From,yes}]}; +connected(cast, disconnect, Data) -> + {next_state,idle,Data}; +connected(cast, {ping,Pid,Tag}, Data) -> + Pid ! {pong,Tag}, + {keep_state,Data}; +connected(Type, Content, Data) -> + case handle_common_events(Type, Content, connected, Data) of + undefined -> + case Type of + {call,From} -> + {keep_state,Data, + [{reply,From,'eh?'}]}; + _ -> + {keep_state,Data} + end; + Result -> + Result + end. + +state0({call,From}, stop, Data) -> + {stop_and_reply,normal,[{reply,From,stopped}],Data}; +state0(Type, Content, Data) -> + case handle_common_events(Type, Content, state0, Data) of + undefined -> + {keep_state,Data}; + Result -> + Result + end. + +hiber_idle({call,From}, 'alive?', Data) -> + {keep_state,Data, + [{reply,From,'alive!'}]}; +hiber_idle({call,From}, hibernate_sync, Data) -> + {next_state,hiber_wakeup,Data, + [{reply,From,hibernating}, + hibernate]}; +hiber_idle(info, hibernate_later, _) -> + Tref = erlang:start_timer(1000, self(), hibernate), + {keep_state,Tref}; +hiber_idle(info, hibernate_now, Data) -> + {keep_state,Data, + [hibernate]}; +hiber_idle(info, {timeout,Tref,hibernate}, Tref) -> + {keep_state,[], + [hibernate]}; +hiber_idle(cast, hibernate_async, Data) -> + {next_state,hiber_wakeup,Data, + [hibernate]}; +hiber_idle(Type, Content, Data) -> + case handle_common_events(Type, Content, hiber_idle, Data) of + undefined -> + {keep_state,Data}; + Result -> + Result + end. + +hiber_wakeup({call,From}, wakeup_sync, Data) -> + {next_state,hiber_idle,Data, + [{reply,From,good_morning}]}; +hiber_wakeup({call,From}, snooze_sync, Data) -> + {keep_state,Data, + [{reply,From,please_just_five_more}, + hibernate]}; +hiber_wakeup(cast, wakeup_async, Data) -> + {next_state,hiber_idle,Data}; +hiber_wakeup(cast, snooze_async, Data) -> + {keep_state,Data, + [hibernate]}; +hiber_wakeup(Type, Content, Data) -> + case handle_common_events(Type, Content, hiber_wakeup, Data) of + undefined -> + {keep_state,Data}; + Result -> + Result + end. + +next_events(internal, Msg, [Msg|Msgs]) -> + {keep_state,Msgs}; +next_events(Type, Content, Data) -> + case handle_common_events(Type, Content, next_events, Data) of + undefined -> + {keep_state,Data}; + Result -> + Result + end. + + +handle_common_events({call,From}, get, State, Data) -> + {keep_state,Data, + [{reply,From,{state,State,Data}}]}; +handle_common_events(cast, {get,Pid}, State, Data) -> + Pid ! {state,State,Data}, + {keep_state,Data}; +handle_common_events({call,From}, stop, _, Data) -> + {stop_and_reply,normal,[{reply,From,stopped}],Data}; +handle_common_events(cast, stop, _, _) -> + stop; +handle_common_events({call,From}, {stop,Reason}, _, Data) -> + {stop_and_reply,Reason,{reply,From,stopped},Data}; +handle_common_events(cast, {stop,Reason}, _, _) -> + {stop,Reason}; +handle_common_events({call,From}, 'alive?', _, Data) -> + {keep_state,Data, + [{reply,From,yes}]}; +handle_common_events(cast, {'alive?',Pid}, _, Data) -> + Pid ! yes, + {keep_state,Data}; +handle_common_events(_, _, _, _) -> + undefined. + +%% Wrapper state machine that uses a map state machine spec +handle_event( + Type, Event, State, [Data|Machine]) + when is_map(Machine) -> + #{State := HandleEvent} = Machine, + case + try HandleEvent(Type, Event, Data) of + Result -> + Result + catch + Result -> + Result + end of + {stop,Reason,NewData} -> + {stop,Reason,[NewData|Machine]}; + {next_state,NewState,NewData} -> + {next_state,NewState,[NewData|Machine]}; + {next_state,NewState,NewData,Ops} -> + {next_state,NewState,[NewData|Machine],Ops}; + {keep_state,NewData} -> + {keep_state,[NewData|Machine]}; + {keep_state,NewData,Ops} -> + {keep_state,[NewData|Machine],Ops}; + Other -> + Other + end; +%% +%% Dispatcher to test callback_mode handle_event_function +%% +%% Wrap the state in a 1 element list just to test non-atom +%% states. Note that the state from init/1 is not wrapped +%% so both atom and non-atom states are tested. +handle_event(Type, Event, State, Data) -> + StateName = unwrap_state(State), + try ?MODULE:StateName(Type, Event, Data) of + Result -> + wrap_result(Result) + catch + throw:Result -> + erlang:raise( + throw, wrap_result(Result), erlang:get_stacktrace()) + end. + +unwrap_state([State]) -> + State; +unwrap_state(State) -> + State. + +wrap_result(Result) -> + case Result of + {next_state,NewState,NewData} -> + {next_state,[NewState],NewData}; + {next_state,NewState,NewData,StateOps} -> + {next_state,[NewState],NewData,StateOps}; + Other -> + Other + end. + + + +code_change(OldVsn, State, Data, CallbackMode) -> + {CallbackMode,State,{OldVsn,Data,CallbackMode}}. + +format_status(terminate, [_Pdict,State,Data]) -> + {formatted,State,Data}; +format_status(normal, [_Pdict,_State,_Data]) -> + [format_status_called]. + +flush() -> + receive + Msg -> + [Msg|flush()] + after 500 -> + [] + end. |