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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (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.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
%% under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2010 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2010 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_hooks).
-export([start/0]).
-export([subscribe/3, unsubscribe/2, trigger/2, notify_remote/5]).
-define(TableName, rabbit_hooks).
-ifdef(use_specs).
-spec(start/0 :: () -> 'ok').
-spec(subscribe/3 :: (atom(), atom(), {atom(), atom(), list()}) -> 'ok').
-spec(unsubscribe/2 :: (atom(), atom()) -> 'ok').
-spec(trigger/2 :: (atom(), list()) -> 'ok').
-spec(notify_remote/5 :: (atom(), atom(), list(), pid(), list()) -> 'ok').
-endif.
start() ->
ets:new(?TableName, [bag, public, named_table]),
ok.
subscribe(Hook, HandlerName, Handler) ->
ets:insert(?TableName, {Hook, HandlerName, Handler}),
ok.
unsubscribe(Hook, HandlerName) ->
ets:match_delete(?TableName, {Hook, HandlerName, '_'}),
ok.
trigger(Hook, Args) ->
Hooks = ets:lookup(?TableName, Hook),
[case catch apply(M, F, [Hook, Name, Args | A]) of
{'EXIT', Reason} ->
rabbit_log:warning("Failed to execute handler ~p for hook ~p: ~p",
[Name, Hook, Reason]);
_ -> ok
end || {_, Name, {M, F, A}} <- Hooks],
ok.
notify_remote(Hook, HandlerName, Args, Pid, PidArgs) ->
Pid ! {rabbitmq_hook, [Hook, HandlerName, Args | PidArgs]},
ok.
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