%-*-Mode:erlang;coding:utf-8;tab-width:4;c-basic-offset:4;indent-tabs-mode:()-*-
% ex: set ft=erlang fenc=utf-8 sts=4 ts=4 sw=4 et:
%%%
%%%------------------------------------------------------------------------
%%% @doc
%%% ==CPG Test Server==
%%% @end
%%%
%%% BSD LICENSE
%%% 
%%% Copyright (c) 2013, Michael Truog <mjtruog at gmail dot com>
%%% All rights reserved.
%%% 
%%% Redistribution and use in source and binary forms, with or without
%%% modification, are permitted provided that the following conditions are met:
%%% 
%%%     * Redistributions of source code must retain the above copyright
%%%       notice, this list of conditions and the following disclaimer.
%%%     * Redistributions in binary form must reproduce the above copyright
%%%       notice, this list of conditions and the following disclaimer in
%%%       the documentation and/or other materials provided with the
%%%       distribution.
%%%     * All advertising materials mentioning features or use of this
%%%       software must display the following acknowledgment:
%%%         This product includes software developed by Michael Truog
%%%     * The name of the author may not be used to endorse or promote
%%%       products derived from this software without specific prior
%%%       written permission
%%% 
%%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
%%% CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
%%% INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
%%% OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
%%% DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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%%% DAMAGE.
%%%
%%% @author Michael Truog <mjtruog [at] gmail (dot) com>
%%% @copyright 2013 Michael Truog
%%% @version 1.2.2 {@date} {@time}
%%%------------------------------------------------------------------------

-module(cpg_test_server).

-author('mjtruog [at] gmail (dot) com').

-behaviour(gen_server).

%% external interface
-export([start_link/1,
         put/2,
         get/1,
         pid/1]).

%% gen_server callbacks
-export([init/1,
         handle_call/3, handle_cast/2, handle_info/2,
         terminate/2, code_change/3]).

-record(state,
    {
        value
    }).

%%%------------------------------------------------------------------------
%%% External interface functions
%%%------------------------------------------------------------------------

%%-------------------------------------------------------------------------
%% @doc
%% ===Start the test server with a cpg via_name().===
%% @end
%%-------------------------------------------------------------------------

-spec start_link(cpg:via_name()) -> {'ok', pid()} | {'error', any()}.

start_link(ViaName) ->
    gen_server:start_link({via, cpg, ViaName}, ?MODULE, [], []).

put(ViaName, Value) ->
    gen_server:call({via, cpg, ViaName}, {put, Value}).

get(ViaName) ->
    gen_server:call({via, cpg, ViaName}, get).

pid(ViaName) ->
    gen_server:call({via, cpg, ViaName}, pid).

%%%------------------------------------------------------------------------
%%% Callback functions from gen_server
%%%------------------------------------------------------------------------

init([]) ->
    {ok, #state{}}.

handle_call({put, Value}, _, State) ->
    {reply, ok, State#state{value = Value}};

handle_call(get, _, #state{value = Value} = State) ->
    {reply, Value, State};

handle_call(pid, _, State) ->
    {reply, self(), State};

handle_call(_, _, State) ->
    {stop, unknown_call, error, State}.

handle_cast(_, State) ->
    {stop, unknown_cast, State}.

handle_info(_, State) ->
    {stop, unknown_info, State}.

terminate(_, _) ->
    ok.

code_change(_, State, _) ->
    {ok, State}.

%%%------------------------------------------------------------------------
%%% Private functions
%%%------------------------------------------------------------------------