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%%
%%% Copyright 2011, Boundary
%%%
%%% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%%-------------------------------------------------------------------
%%% File: folsom_sup.erl
%%% @author joe williams <j@boundary.com>
%%% @doc
%%%
%%% @end
%%%-------------------------------------------------------------------
-module(folsom_sup).
-behaviour(supervisor).
%% API
-export([start_link/0, create_tables/0]).
%% Supervisor callbacks
-export([init/1]).
-include("folsom.hrl").
-define(SERVER, ?MODULE).
%%%===================================================================
%%% API functions
%%%===================================================================
%%--------------------------------------------------------------------
%% @doc
%% Starts the supervisor
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
supervisor:start_link({local, ?SERVER}, ?MODULE, []).
%%%===================================================================
%%% Supervisor callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever a supervisor is started using supervisor:start_link/[2,3],
%% this function is called by the new process to find out about
%% restart strategy, maximum restart frequency and child
%% specifications.
%%
%% @spec init(Args) -> {ok, {SupFlags, [ChildSpec]}} |
%% ignore |
%% {error, Reason}
%% @end
%%--------------------------------------------------------------------
init([]) ->
create_tables(),
RestartStrategy = one_for_one,
MaxRestarts = 1000,
MaxSecondsBetweenRestarts = 3600,
SupFlags = {RestartStrategy, MaxRestarts, MaxSecondsBetweenRestarts},
Restart = permanent,
Shutdown = 2000,
Type = worker,
TimerServer = {folsom_meter_timer_server,
{folsom_meter_timer_server, start_link, []},
Restart, Shutdown, Type, [folsom_meter_timer_server]},
HistETSServer = {folsom_metrics_histogram_ets,
{folsom_metrics_histogram_ets, start_link, []},
Restart, Shutdown, Type, [folsom_metrics_histogram_ets]},
{ok, {SupFlags, [TimerServer, HistETSServer]}}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
create_tables() ->
Tables = [
{?FOLSOM_TABLE, [set, named_table, public, {read_concurrency, true}]},
{?COUNTER_TABLE, [set, named_table, public, {write_concurrency, true}]},
{?GAUGE_TABLE, [set, named_table, public, {write_concurrency, true}]},
{?HISTOGRAM_TABLE, [set, named_table, public, {write_concurrency, true}]},
{?METER_TABLE, [set, named_table, public, {write_concurrency, true}]},
{?METER_READER_TABLE, [set, named_table, public, {write_concurrency, true}]},
{?HISTORY_TABLE, [set, named_table, public, {write_concurrency, true}]}
],
[maybe_create_table(ets:info(Name), Name, Opts) || {Name, Opts} <- Tables],
ok.
maybe_create_table(undefined, Name, Opts) ->
ets:new(Name, Opts);
maybe_create_table(_, _, _) ->
ok.
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