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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 Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2013 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_queue_collector).
-behaviour(gen_server).
-export([start_link/0, register/2, delete_all/1]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(state, {monitors, delete_from}).
-include("rabbit.hrl").
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(start_link/0 :: () -> rabbit_types:ok_pid_or_error()).
-spec(register/2 :: (pid(), pid()) -> 'ok').
-spec(delete_all/1 :: (pid()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
start_link() ->
gen_server:start_link(?MODULE, [], []).
register(CollectorPid, Q) ->
gen_server:call(CollectorPid, {register, Q}, infinity).
delete_all(CollectorPid) ->
gen_server:call(CollectorPid, delete_all, infinity).
%%----------------------------------------------------------------------------
init([]) ->
{ok, #state{monitors = pmon:new(), delete_from = undefined}}.
%%--------------------------------------------------------------------------
handle_call({register, QPid}, _From,
State = #state{monitors = QMons, delete_from = Deleting}) ->
case Deleting of
undefined -> ok;
_ -> ok = rabbit_amqqueue:delete_immediately([QPid])
end,
{reply, ok, State#state{monitors = pmon:monitor(QPid, QMons)}};
handle_call(delete_all, From, State = #state{monitors = QMons,
delete_from = undefined}) ->
case pmon:monitored(QMons) of
[] -> {reply, ok, State#state{delete_from = From}};
QPids -> ok = rabbit_amqqueue:delete_immediately(QPids),
{noreply, State#state{delete_from = From}}
end.
handle_cast(Msg, State) ->
{stop, {unhandled_cast, Msg}, State}.
handle_info({'DOWN', _MRef, process, DownPid, _Reason},
State = #state{monitors = QMons, delete_from = Deleting}) ->
QMons1 = pmon:erase(DownPid, QMons),
case Deleting =/= undefined andalso pmon:is_empty(QMons1) of
true -> gen_server:reply(Deleting, ok);
false -> ok
end,
{noreply, State#state{monitors = QMons1}}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
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