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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(worker_pool_worker).
-behaviour(gen_server2).
-export([start_link/1, submit/2, submit_async/2, run/1]).
-export([set_maximum_since_use/2]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3, prioritise_cast/3]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(mfargs() :: {atom(), atom(), [any()]}).
-spec(start_link/1 :: (any()) -> {'ok', pid()} | {'error', any()}).
-spec(submit/2 :: (pid(), fun (() -> A) | mfargs()) -> A).
-spec(submit_async/2 :: (pid(), fun (() -> any()) | mfargs()) -> 'ok').
-spec(run/1 :: (fun (() -> A)) -> A; (mfargs()) -> any()).
-spec(set_maximum_since_use/2 :: (pid(), non_neg_integer()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
-define(HIBERNATE_AFTER_MIN, 1000).
-define(DESIRED_HIBERNATE, 10000).
%%----------------------------------------------------------------------------
start_link(WId) ->
gen_server2:start_link(?MODULE, [WId], [{timeout, infinity}]).
submit(Pid, Fun) ->
gen_server2:call(Pid, {submit, Fun}, infinity).
submit_async(Pid, Fun) ->
gen_server2:cast(Pid, {submit_async, Fun}).
set_maximum_since_use(Pid, Age) ->
gen_server2:cast(Pid, {set_maximum_since_use, Age}).
run({M, F, A}) ->
apply(M, F, A);
run(Fun) ->
Fun().
%%----------------------------------------------------------------------------
init([WId]) ->
ok = file_handle_cache:register_callback(?MODULE, set_maximum_since_use,
[self()]),
ok = worker_pool:idle(WId),
put(worker_pool_worker, true),
{ok, WId, hibernate,
{backoff, ?HIBERNATE_AFTER_MIN, ?HIBERNATE_AFTER_MIN, ?DESIRED_HIBERNATE}}.
prioritise_cast({set_maximum_since_use, _Age}, _Len, _State) -> 8;
prioritise_cast(_Msg, _Len, _State) -> 0.
handle_call({submit, Fun}, From, WId) ->
gen_server2:reply(From, run(Fun)),
ok = worker_pool:idle(WId),
{noreply, WId, hibernate};
handle_call(Msg, _From, State) ->
{stop, {unexpected_call, Msg}, State}.
handle_cast({submit_async, Fun}, WId) ->
run(Fun),
ok = worker_pool:idle(WId),
{noreply, WId, hibernate};
handle_cast({set_maximum_since_use, Age}, WId) ->
ok = file_handle_cache:set_maximum_since_use(Age),
{noreply, WId, hibernate};
handle_cast(Msg, State) ->
{stop, {unexpected_cast, Msg}, State}.
handle_info(Msg, State) ->
{stop, {unexpected_info, Msg}, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
terminate(_Reason, State) ->
State.
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