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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) 2007-2009 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2009 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2009 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_exchange_events).
-include("rabbit.hrl").
-behaviour(gen_server2).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-ifdef(use_specs).
-spec(start_link/0 :: () -> {'ok', pid()} | 'ignore' | {'error', any()}).
-endif.
%%----------------------------------------------------------------------------
start_link() ->
gen_server2:start_link({local, ?SERVER}, ?MODULE, [], []).
%%---------------------------------------------------------------------------
with_exchange(#binding{exchange_name = ExchangeName}, Fun) ->
case rabbit_exchange:lookup(ExchangeName) of
{ok, X} ->
Fun(X);
not_found ->
ok
end.
handle_table_event({write, rabbit_exchange, X = #exchange{type = Type}, _OldRecs, _ActivityId}) ->
%% Exchange created/recovered.
ok = Type:init(X);
handle_table_event({delete, rabbit_exchange, {rabbit_exchange, _ExchangeName},
[X = #exchange{type = Type}], _ActivityId}) ->
%% Exchange deleted.
ok = Type:delete(X);
handle_table_event({write, rabbit_route, #route{binding = B}, _OldRecs, _ActivityId}) ->
%% New binding.
ok = with_exchange(B, fun (X = #exchange{type = Type}) -> Type:add_binding(X, B) end);
handle_table_event({delete, rabbit_route, #route{binding = B}, _OldRecs, _ActivityId}) ->
%% Deleted binding.
ok = with_exchange(B, fun (X = #exchange{type = Type}) -> Type:delete_binding(X, B) end);
handle_table_event(_Event) ->
{error, unhandled_table_event}.
%%---------------------------------------------------------------------------
init([]) ->
mnesia:subscribe({table, rabbit_exchange, detailed}),
mnesia:subscribe({table, rabbit_route, detailed}),
{ok, no_state}.
handle_call(Request, _From, State) ->
{stop, {unhandled_call, Request}, State}.
handle_cast(Request, State) ->
{stop, {unhandled_cast, Request}, State}.
handle_info({mnesia_table_event, Event}, State) ->
case catch handle_table_event(Event) of
{'EXIT', Reason} ->
rabbit_log:error("Exchange event callback failed~n~p~n", [[{event, Event},
{reason, Reason}]]);
ok ->
ok;
{error, unhandled_table_event} ->
rabbit_log:error("Unexpected mnesia_table_event~n~p~n", [Event])
end,
{noreply, State};
handle_info(Info, State) ->
{stop, {unhandled_info, Info}, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
|
