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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2016. 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(archive_script_dict).
-behaviour(sys).
%% Public
-export([new/1, store/3, erase/2, find/2, foldl/3, erase/1]).
%% Internal
-export([init/3, loop/3]).
%% supervisor callback
-export([start_link/2]).
%% sys callback functions
-export([
system_continue/3,
system_terminate/4,
system_code_change/4
]).
-define(SUPERVISOR, archive_script_dict_sup).
start_link(Name, Debug) ->
proc_lib:start_link(?MODULE, init, [self(), Name, Debug], infinity, []).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Client
new(Name) ->
supervisor:start_child(?SUPERVISOR, [Name]).
store(Pid, Key, Val) ->
call(Pid, {store, Key, Val}).
erase(Pid, Key) ->
call(Pid, {erase, Key}).
find(Pid, Key) ->
call(Pid, {find, Key}).
foldl(Pid, Fun, Acc) ->
call(Pid, {foldl, Fun, Acc}).
erase(Pid) ->
call(Pid, stop).
call(Name, Msg) when is_atom(Name) ->
call(whereis(Name), Msg);
call(Pid, Msg) when is_pid(Pid) ->
Ref = erlang:monitor(process, Pid),
Pid ! {self(), Ref, Msg},
receive
{Ref, Reply} ->
erlang:demonitor(Ref, [flush]),
Reply;
{'DOWN', Ref, _, _, Reason} ->
{error, Reason}
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Server
init(Parent, Name, Debug) ->
register(Name, self()),
Dict = dict:new(),
proc_lib:init_ack(Parent, {ok, self()}),
loop(Dict, Parent, Debug).
loop(Dict, Parent, Debug) ->
receive
{system, From, Msg} ->
sys:handle_system_msg(Msg, From, Parent, ?MODULE, Debug, Dict);
{ReplyTo, Ref, {store, Key, Val}} ->
Dict2 = dict:store(Key, Val, Dict),
ReplyTo ! {Ref, ok},
?MODULE:loop(Dict2, Parent, Debug);
{ReplyTo, Ref, {erase, Key}} ->
Dict2 = dict:erase(Key, Dict),
ReplyTo ! {Ref, ok},
?MODULE:loop(Dict2, Parent, Debug);
{ReplyTo, Ref, {find, Key}} ->
Res = dict:find(Key, Dict),
ReplyTo ! {Ref, Res},
?MODULE:loop(Dict, Parent, Debug);
{ReplyTo, Ref, {foldl, Fun, Acc}} ->
Acc2 = dict:foldl(Fun, Acc, Dict),
ReplyTo ! {Ref, {ok, Acc2}},
?MODULE:loop(Dict, Parent, Debug);
{ReplyTo, Ref, stop} ->
ReplyTo ! {Ref, ok},
exit(normal);
Msg ->
error_logger:format("~p got unexpected message: ~p\n",
[self(), Msg]),
?MODULE:loop(Dict, Parent, Debug)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% sys callbacks
system_continue(Parent, Debug, Dict) ->
?MODULE:loop(Dict, Parent, Debug).
system_terminate(Reason, _Parent, _Debug, _Dict) ->
exit(Reason).
system_code_change(Dict,_Module,_OldVsn,_Extra) ->
{ok, Dict}.
|
