diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/diameter/src/base/diameter_reg.erl | 255 |
1 files changed, 142 insertions, 113 deletions
diff --git a/lib/diameter/src/base/diameter_reg.erl b/lib/diameter/src/base/diameter_reg.erl index 882b9da238..619b12ecad 100644 --- a/lib/diameter/src/base/diameter_reg.erl +++ b/lib/diameter/src/base/diameter_reg.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2010-2011. All Rights Reserved. +%% Copyright Ericsson AB 2010-2012. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -30,7 +30,8 @@ add_new/1, del/1, repl/2, - match/1]). + match/1, + wait/1]). -export([start_link/0]). @@ -65,27 +66,22 @@ %% Table entry containing the Term -> Pid mapping. -define(MAPPING(Term, Pid), {Term, Pid}). --record(state, {id = now()}). - -%%% ---------------------------------------------------------- -%%% # add(T) -%%% -%%% Input: Term = term() -%%% -%%% Output: true -%%% -%%% Description: Associate the specified term with self(). The list of pids -%%% having this or other assocations can be retrieved using -%%% match/1. -%%% -%%% An association is removed when the calling process dies -%%% or as a result of calling del/1. Adding the same term -%%% more than once is equivalent to adding it exactly once. -%%% -%%% Note that since match/1 takes a pattern as argument, -%%% specifying a term that contains match variables is -%%% probably not a good idea -%%% ---------------------------------------------------------- +-record(state, {id = now(), + q = []}). %% [{From, Pat}] + +%% =========================================================================== +%% # add(T) +%% +%% Associate the specified term with self(). The list of pids having +%% this or other assocations can be retrieved using match/1. +%% +%% An association is removed when the calling process dies or as a +%% result of calling del/1. Adding the same term more than once is +%% equivalent to adding it exactly once. +%% +%% Note that since match/1 takes a pattern as argument, specifying a +%% term that contains match variables is probably not a good idea +%% =========================================================================== -spec add(any()) -> true. @@ -93,17 +89,12 @@ add(T) -> call({add, fun ets:insert/2, T, self()}). -%%% ---------------------------------------------------------- -%%% # add_new(T) -%%% -%%% Input: T = term() -%%% -%%% Output: true | false -%%% -%%% Description: Like add/1 but only one process is allowed to have the -%%% the association, false being returned if an association -%%% already exists. -%%% ---------------------------------------------------------- +%% =========================================================================== +%% # add_new(T) +%% +%% Like add/1 but only one process is allowed to have the the +%% association, false being returned if an association already exists. +%% =========================================================================== -spec add_new(any()) -> boolean(). @@ -111,16 +102,12 @@ add(T) -> add_new(T) -> call({add, fun insert_new/2, T, self()}). -%%% ---------------------------------------------------------- -%%% # repl(T, NewT) -%%% -%%% Input: T, NewT = term() -%%% -%%% Output: true | false -%%% -%%% Description: Like add/1 but only replace an existing association on T, -%%% false being returned if it doesn't exist. -%%% ---------------------------------------------------------- +%% =========================================================================== +%% # repl(T, NewT) +%% +%% Like add/1 but only replace an existing association on T, false +%% being returned if it doesn't exist. +%% =========================================================================== -spec repl(any(), any()) -> boolean(). @@ -128,15 +115,11 @@ add_new(T) -> repl(T, U) -> call({repl, T, U, self()}). -%%% ---------------------------------------------------------- -%%% # del(Term) -%%% -%%% Input: Term = term() -%%% -%%% Output: true -%%% -%%% Description: Remove any existing association of Term with self(). -%%% ---------------------------------------------------------- +%% =========================================================================== +%% # del(Term) +%% +%% Remove any existing association of Term with self(). +%% =========================================================================== -spec del(any()) -> true. @@ -144,20 +127,16 @@ repl(T, U) -> del(T) -> call({del, T, self()}). -%%% ---------------------------------------------------------- -%%% # match(Pat) -%%% -%%% Input: Pat = pattern in the sense of ets:match_object/2. -%%% -%%% Output: list of {Term, Pid} -%%% -%%% Description: Return the list of associations whose Term, as specified -%%% to add/1 or add_new/1, matches the specified pattern. -%%% -%%% Note that there's no guarantee that the returned processes -%%% are still alive. (Although one that isn't will soon have -%%% its associations removed.) -%%% ---------------------------------------------------------- +%% =========================================================================== +%% # match(Pat) +%% +%% Return the list of associations whose Term, as specified to add/1 +%% or add_new/1, matches the specified pattern. +%% +%% Note that there's no guarantee that the returned processes are +%% still alive. (Although one that isn't will soon have its +%% associations removed.) +%% =========================================================================== -spec match(tuple()) -> [{term(), pid()}]. @@ -165,9 +144,17 @@ del(T) -> match(Pat) -> ets:match_object(?TABLE, ?MAPPING(Pat, '_')). -%% --------------------------------------------------------- -%% EXPORTED INTERNAL FUNCTIONS -%% --------------------------------------------------------- +%% =========================================================================== +%% # wait(Pat) +%% +%% Like match/1 but return only when the result is non-empty or fails. +%% It's up to the caller to ensure that the wait won't be forever. +%% =========================================================================== + +wait(Pat) -> + call({wait, Pat}). + +%% =========================================================================== start_link() -> ServerName = {local, ?SERVER}, @@ -182,7 +169,7 @@ uptime() -> %% pids/0 %% -%% Output: list of {Pid, [Term, ...]} +%% Return: list of {Pid, [Term, ...]} pids() -> to_list(fun swap/1). @@ -202,89 +189,100 @@ id(T) -> T. %% terms/0 %% -%% Output: list of {Term, [Pid, ...]} +%% Return: list of {Term, [Pid, ...]} terms() -> to_list(fun id/1). swap({X,Y}) -> {Y,X}. -%%% ---------------------------------------------------------- -%%% # init(Role) -%%% -%%% Output: {ok, State} -%%% ---------------------------------------------------------- +%% ---------------------------------------------------------- +%% # init/1 +%% ---------------------------------------------------------- init(_) -> ets:new(?TABLE, [bag, named_table]), {ok, #state{}}. -%%% ---------------------------------------------------------- -%%% # handle_call(Request, From, State) -%%% ---------------------------------------------------------- +%% ---------------------------------------------------------- +%% # handle_call/3 +%% ---------------------------------------------------------- -handle_call({add, Fun, Key, Pid}, _, State) -> +handle_call(Req, From, S) + when not is_record(S, state) -> + handle_call(Req, From, upgrade(S)); + +handle_call({add, Fun, Key, Pid}, _, S) -> B = Fun(?TABLE, {Key, Pid}), monitor(B andalso no_monitor(Pid), Pid), - {reply, B, State}; + {reply, B, pending(B, S)}; -handle_call({del, Key, Pid}, _, State) -> - {reply, ets:delete_object(?TABLE, ?MAPPING(Key, Pid)), State}; +handle_call({del, Key, Pid}, _, S) -> + {reply, ets:delete_object(?TABLE, ?MAPPING(Key, Pid)), S}; -handle_call({repl, T, U, Pid}, _, State) -> +handle_call({repl, T, U, Pid}, _, S) -> MatchSpec = [{?MAPPING('$1', Pid), [{'=:=', '$1', {const, T}}], ['$_']}], - {reply, repl(ets:select(?TABLE, MatchSpec), U, Pid), State}; + {reply, repl(ets:select(?TABLE, MatchSpec), U, Pid), S}; + +handle_call({wait, Pat}, From, #state{q = Q} = S) -> + case find(Pat) of + {ok, L} -> + {reply, L, S}; + false -> + {noreply, S#state{q = [{From, Pat} | Q]}} + end; -handle_call(state, _, State) -> - {reply, State, State}; +handle_call(state, _, S) -> + {reply, S, S}; -handle_call(uptime, _, #state{id = Time} = State) -> - {reply, diameter_lib:now_diff(Time), State}; +handle_call(uptime, _, #state{id = Time} = S) -> + {reply, diameter_lib:now_diff(Time), S}; -handle_call(Req, From, State) -> +handle_call(Req, From, S) -> ?UNEXPECTED([Req, From]), - {reply, nok, State}. + {reply, nok, S}. -%%% ---------------------------------------------------------- -%%% # handle_cast(Request, State) -%%% ---------------------------------------------------------- +%% ---------------------------------------------------------- +%% # handle_cast/2 +%% ---------------------------------------------------------- -handle_cast(Msg, State)-> +handle_cast(Msg, S)-> ?UNEXPECTED([Msg]), - {noreply, State}. + {noreply, S}. -%%% ---------------------------------------------------------- -%%% # handle_info(Request, State) -%%% ---------------------------------------------------------- +%% ---------------------------------------------------------- +%% # handle_info/2 +%% ---------------------------------------------------------- -handle_info({'DOWN', MRef, process, Pid, _}, State) -> +handle_info({'DOWN', MRef, process, Pid, _}, S) -> ets:delete_object(?TABLE, ?MONITOR(Pid, MRef)), ets:match_delete(?TABLE, ?MAPPING('_', Pid)), - {noreply, State}; + {noreply, S}; -handle_info(Info, State) -> +handle_info(Info, S) -> ?UNEXPECTED([Info]), - {noreply, State}. + {noreply, S}. -%%% ---------------------------------------------------------- -%%% # terminate(Reason, State) -%%% ---------------------------------------------------------- +%% ---------------------------------------------------------- +%% # terminate/2 +%% ---------------------------------------------------------- terminate(_Reason, _State)-> ok. -%%% ---------------------------------------------------------- -%%% # code_change(OldVsn, State, Extra) -%%% ---------------------------------------------------------- +%% ---------------------------------------------------------- +%% # code_change/3 +%% ---------------------------------------------------------- code_change(_OldVsn, State, _Extra) -> {ok, State}. -%% --------------------------------------------------------- -%% INTERNAL FUNCTIONS -%% --------------------------------------------------------- +%% =========================================================================== + +upgrade(S) -> + #state{} = list_to_tuple(tuple_to_list(S) ++ [[]]). monitor(true, Pid) -> ets:insert(?TABLE, ?MONITOR(Pid, erlang:monitor(process, Pid))); @@ -321,6 +319,37 @@ repl([?MAPPING(_, Pid) = M], Key, Pid) -> repl([], _, _) -> false. +%% pending/1 + +pending(true, #state{q = [_|_] = Q} = S) -> + S#state{q = q(lists:reverse(Q), [])}; %% retain reply order +pending(_, S) -> + S. + +q([], Q) -> + Q; +q([{From, Pat} = T | Rest], Q) -> + case find(Pat) of + {ok, L} -> + gen_server:reply(From, L), + q(Rest, Q); + false -> + q(Rest, [T|Q]) + end. + +%% find/1 + +find(Pat) -> + try match(Pat) of + [] -> + false; + L -> + {ok, L} + catch + _:_ -> + {ok, []} + end. + %% call/1 call(Request) -> |