Created
February 12, 2010 01:08
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-module(t). | |
-behavior(gen_server). | |
-export([start_link/0, print_state/0]). | |
-export([init/1, handle_call/3, handle_cast/2, | |
handle_info/2, terminate/2, code_change/3]). | |
%%==================================================================== | |
%% API | |
%%==================================================================== | |
%%-------------------------------------------------------------------- | |
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error} | |
%% Description: Starts the server | |
%%-------------------------------------------------------------------- | |
start_link() -> | |
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). | |
%%-------------------------------------------------------------------- | |
%% Function: print_state() -> ok | |
%% Description: Prints the current state to std output | |
%%-------------------------------------------------------------------- | |
print_state() -> | |
gen_server:call(?MODULE, print_state). | |
%%==================================================================== | |
%% gen_server callbacks | |
%%==================================================================== | |
%%-------------------------------------------------------------------- | |
%% Function: init(Args) -> {ok, State} | | |
%% {ok, State, Timeout} | | |
%% ignore | | |
%% {stop, Reason} | |
%% Description: Initiates the server | |
%%-------------------------------------------------------------------- | |
init([]) -> | |
{ok, 0}. | |
%%-------------------------------------------------------------------- | |
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} | | |
%% {reply, Reply, State, Timeout} | | |
%% {noreply, State} | | |
%% {noreply, State, Timeout} | | |
%% {stop, Reason, Reply, State} | | |
%% {stop, Reason, State} | |
%% Description: Handling call messages | |
%%-------------------------------------------------------------------- | |
handle_call(print_state, _From, State) -> | |
io:format("state: ~p~n", [State]), | |
{reply, ok, State+1}; | |
handle_call(_Call, _From, State) -> | |
{noreply, State}. | |
%%-------------------------------------------------------------------- | |
%% Function: handle_cast(Msg, State) -> {noreply, State} | | |
%% {noreply, State, Timeout} | | |
%% {stop, Reason, State} | |
%% Description: Handling cast messages | |
%%-------------------------------------------------------------------- | |
handle_cast(_Cast, State) -> | |
{noreply, State}. | |
%%-------------------------------------------------------------------- | |
%% Function: handle_info(Info, State) -> {noreply, State} | | |
%% {noreply, State, Timeout} | | |
%% {stop, Reason, State} | |
%% Description: Handling all non call/cast messages | |
%%-------------------------------------------------------------------- | |
handle_info(_Info, State) -> | |
{noreply, State}. | |
%%-------------------------------------------------------------------- | |
%% Function: terminate(Reason, State) -> void() | |
%% Description: This function is called by a gen_server when it is about to | |
%% terminate. It should be the opposite of Module:init/1 and do any necessary | |
%% cleaning up. When it returns, the gen_server terminates with Reason. | |
%% The return value is ignored. | |
%%-------------------------------------------------------------------- | |
terminate(_Reason, _State) -> ok. | |
%%-------------------------------------------------------------------- | |
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState} | |
%% Description: Convert process state when code is changed | |
%%-------------------------------------------------------------------- | |
code_change(_OldVsn, State, _Extra) -> | |
{ok, State}. |
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