Created
January 9, 2009 01:03
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%%%------------------------------------------------------------------- | |
%%% File: gen_phone.erl | |
%%% @author Sean Cribbs <> [] | |
%%% @copyright 2009 Sean Cribbs | |
%%% @doc | |
%%% | |
%%% @end | |
%%% | |
%%% @since 2009-01-08 by Sean Cribbs | |
%%%------------------------------------------------------------------- | |
-module(gen_phone). | |
-author(''). | |
-behaviour(gen_server). | |
%% API | |
-export([start_link/2, send_message/2, stop/1]). | |
%% gen_server callbacks | |
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, | |
terminate/2, code_change/3]). | |
-record(state, {me, neighbor}). | |
%%==================================================================== | |
%% API | |
%%==================================================================== | |
%%-------------------------------------------------------------------- | |
%% @spec start_link() -> {ok,Pid} | ignore | {error,Error} | |
%% @doc Starts the server | |
%% @end | |
%%-------------------------------------------------------------------- | |
start_link(Me, Neighbor) -> | |
gen_server:start_link({global, Me}, ?MODULE, [Me, Neighbor], []). | |
send_message(Message, Who) -> | |
gen_server:call({global, Who}, {send_message, Message}). | |
stop(Who) -> | |
gen_server:call({global, Who}, stop). | |
%%==================================================================== | |
%% gen_server callbacks | |
%%==================================================================== | |
%%-------------------------------------------------------------------- | |
%% @spec init(Args) -> {ok, State} | | |
%% {ok, State, Timeout} | | |
%% ignore | | |
%% {stop, Reason} | |
%% @doc Initiates the server | |
%% @end | |
%%-------------------------------------------------------------------- | |
init([Me, Neighbor]) -> | |
{ok, #state{me=Me, neighbor=Neighbor}}. | |
%%-------------------------------------------------------------------- | |
%% @spec | |
%% handle_call(Request, From, State) -> {reply, Reply, State} | | |
%% {reply, Reply, State, Timeout} | | |
%% {noreply, State} | | |
%% {noreply, State, Timeout} | | |
%% {stop, Reason, Reply, State} | | |
%% {stop, Reason, State} | |
%% @doc Handling call messages | |
%% @end | |
%%-------------------------------------------------------------------- | |
handle_call({send_message, Message}, _From, State) -> | |
global:send(State#state.neighbor, {State#state.me, Message}), | |
{reply, ok, State}; | |
handle_call(stop, _From, _State) -> | |
{stop, normal}; | |
handle_call(_Request, _From, State) -> | |
Reply = ok, | |
{reply, Reply, State}. | |
%%-------------------------------------------------------------------- | |
%% @spec handle_cast(Msg, State) -> {noreply, State} | | |
%% {noreply, State, Timeout} | | |
%% {stop, Reason, State} | |
%% @doc Handling cast messages | |
%% @end | |
%%-------------------------------------------------------------------- | |
handle_cast(_Msg, State) -> | |
{noreply, State}. | |
%%-------------------------------------------------------------------- | |
%% @spec handle_info(Info, State) -> {noreply, State} | | |
%% {noreply, State, Timeout} | | |
%% {stop, Reason, State} | |
%% @doc Handling all non call/cast messages | |
%% @end | |
%%-------------------------------------------------------------------- | |
handle_info(Message, State) when is_tuple(Message) -> | |
MyName = State#state.me, | |
Neighbor = State#state.neighbor, | |
io:format("~p~n", [Message]), | |
case check_circle(Message, MyName) of | |
true -> | |
ok; | |
_ -> | |
global:send(Neighbor, {MyName, Message}) | |
end, | |
{noreply, State}; | |
handle_info(_Info, State) -> | |
{noreply, State}. | |
%%-------------------------------------------------------------------- | |
%% @spec terminate(Reason, State) -> void() | |
%% @doc 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. | |
%% @end | |
%%-------------------------------------------------------------------- | |
terminate(_Reason, _State) -> | |
ok. | |
%%-------------------------------------------------------------------- | |
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState} | |
%% @doc Convert process state when code is changed | |
%% @end | |
%%-------------------------------------------------------------------- | |
code_change(_OldVsn, State, _Extra) -> | |
{ok, State}. | |
%%-------------------------------------------------------------------- | |
%%% Internal functions | |
%%-------------------------------------------------------------------- | |
check_circle({MyName, _Message}, MyName) -> | |
true; | |
check_circle({_Sender, Message}, MyName) when is_tuple(Message) -> | |
check_circle(Message, MyName); | |
check_circle(_,_) -> false. |
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-module(telephone). | |
-export([start/3, send_message/2, stop/1]). | |
start(MyName, Neighbor, Node) -> | |
pong = net_adm:ping(Node), | |
Pid = spawn_link(node(), fun() -> loop(MyName, Neighbor) end), | |
global:register_name(MyName, Pid). | |
send_message(Message, Who) -> | |
global:send(Who, {send_message, Message}). | |
stop(MyName) -> | |
global:send(MyName, stop). | |
loop(MyName, Neighbor) -> | |
receive | |
stop -> ok; | |
{send_message, Message} -> | |
global:send(Neighbor, {MyName, Message}), | |
loop(MyName, Neighbor); | |
Message when is_tuple(Message) -> | |
io:format("~p~n", [Message]), | |
case check_circle(Message, MyName) of | |
true -> | |
ok; | |
_ -> | |
global:send(Neighbor, {MyName, Message}) | |
end, | |
loop(MyName, Neighbor); | |
_ -> | |
loop(MyName, Neighbor) | |
end. | |
check_circle({MyName, _Message}, MyName) -> | |
true; | |
check_circle({_Sender, Message}, MyName) when is_tuple(Message) -> | |
check_circle(Message, MyName); | |
check_circle(_,_) -> false. |
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