Add also Cuesport to deps from https://github.com/goj/cuesport
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@ -0,0 +1,16 @@
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.PHONY: all reload compile clean
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all: compile
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compile: rebar
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./rebar get-deps compile
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reload: compile
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zsh -c './reload.erl $$(foreach f (src/*.erl); basename $$f .erl; end)'
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rebar:
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wget -c http://cloud.github.com/downloads/basho/rebar/rebar
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chmod +x $@
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clean: rebar
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./rebar clean
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@ -0,0 +1,3 @@
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Copyright 2011 Erlang Solutions Ltd.
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Use `git shortlog --summary` to get the list of developers.
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@ -0,0 +1,38 @@
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Summary
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=======
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Cuesport is a simple pool of workers, meant mainly to be used with things like DB connections.
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Use when poolboy's elaborate checkin/checkout seems to be overkill for your task.
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Usage
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-----
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Suggested usage is to create your own wrapper module which wraps cuesport and provides
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wrapper functions to hide pool's usage. Something in the lines of:
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```erlang
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-module(myproduct_redis).
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-export([start_link/0, q/1, q/2]).
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-define(POOL_NAME, myproduct_redis_pool).
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%%%===================================================================
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%%% API functions
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%%%===================================================================
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start_link() ->
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PoolSize = get_config(redis_pool_size),
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EredisOpts = get_config(redis_worker_config),
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ChildMods = [eredis, eredis_client, eredis_parser],
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ChildMFA = {eredis, start_link, EredisOpts},
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cuesport:start_link(?POOL_NAME, PoolSize, ChildMods, ChildMFA).
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q(Query) ->
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eredis:q(cuesport:get_worker(?POOL_NAME), Query).
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q(Query, Opts) ->
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eredis:q(cuesport:get_worker(?POOL_NAME), Query, Opts).
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```
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Then add `myproduct_redis` to your supervision tree.
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{application, cuesport, [
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{description, "Simple pool of workers"},
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{vsn, "0.1"},
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{registered, []},
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{applications, [kernel, stdlib]},
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{env, []}
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]}.
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%%%===================================================================
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%%% @copyright (C) 2011, Erlang Solutions Ltd.
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%%%
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%%% Licensed under the Apache License, Version 2.0 (the "License");
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%%% you may not use this file except in compliance with the License.
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%%% You may obtain a copy of the License at
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%%%
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%%% http://www.apache.org/licenses/LICENSE-2.0
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%%%
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%%% Unless required by applicable law or agreed to in writing, software
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%%% distributed under the License is distributed on an "AS IS" BASIS,
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%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%%% See the License for the specific language governing permissions and
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%%% limitations under the License.
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%%%
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%%% @doc Utility for using a pool of workers easily
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%%% Obvious pun is obvious.
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%%% @end
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%%%===================================================================
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-module(cuesport).
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-behaviour(supervisor).
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%% API
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-export([start_link/4,
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start_link/5,
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get_worker/1]).
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%% Supervisor callbacks
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-export([init/1]).
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%% Internal exports
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-export([start_worker/3]).
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-define(SERVER, ?MODULE).
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%%%===================================================================
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%%% API functions
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%%%===================================================================
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-spec start_link(atom(), integer(), [atom()], {atom(), atom(), [term()]}) ->
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{ok, pid()} | ignore | {error, term()}.
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start_link(PoolName, PoolSize, ChildMods, ChildMFA) ->
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start_link(PoolName, PoolSize, 2*PoolSize, ChildMods, ChildMFA).
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-spec start_link(atom(), integer(), integer(), [atom()], {atom(), atom(), [term()]}) ->
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{ok, pid()} | ignore | {error, term()}.
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start_link(PoolName, PoolSize, MaxRestarts, ChildMods, ChildMFA) ->
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Args = [PoolName, PoolSize, MaxRestarts, ChildMods, ChildMFA],
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SupName = list_to_atom("cuesport_" ++ atom_to_list(PoolName) ++ "_sup"),
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supervisor:start_link({local, SupName}, ?MODULE, Args).
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-spec get_worker(atom()) -> pid().
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get_worker(PoolName) ->
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[{pool_size, PoolSize}] = ets:lookup(PoolName, pool_size),
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N = ets:update_counter(PoolName, seq, {2, 1, PoolSize, 1}),
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[{N, Worker}] = ets:lookup(PoolName, N),
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Worker.
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%%%===================================================================
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%%% Supervisor callbacks
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%%%===================================================================
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init([PoolName, PoolSize, MaxRestarts, ChildMods, ChildMFA]) ->
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PoolTable = ets:new(PoolName, [named_table, public]),
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ets:insert(PoolTable, {pool_size, PoolSize}),
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ets:insert(PoolTable, {seq, 0}),
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MFA = fun(Id) ->
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{?MODULE, start_worker, [Id, PoolTable, ChildMFA]}
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end,
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Children = [{N, MFA(N), transient, 2000, worker, ChildMods}
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|| N <- lists:seq(1, PoolSize)],
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{ok, {{one_for_one, MaxRestarts, PoolSize}, Children}}.
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%%%===================================================================
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%%% non-API exports
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%%%===================================================================
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-spec start_worker(integer(), atom(), {module(), atom(), [term()]}) -> {ok, pid()}.
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start_worker(Id, PoolTable, {M, F, A}) ->
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{ok, Pid} = apply(M, F, A),
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ets:insert(PoolTable, {Id, Pid}),
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{ok, Pid}.
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