+ 

Orientato agli eventi I/O asincrono Reactor pattern Google V8 Singolo thread 

Websocket con fallback Semplice messaggistica 

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“In attesa di uno straniero...” “Stai parlando con uno straniero, salutalo!” Straniero: asl? Tu: 98 m antarctica Straniero: o_o” [Qualcuno lascia la chat] 

Server 

var waiting = []; // Lista client in attesa var couples = {}; // { // clientID: stranger, // strangerID: client // ... // } 

var io = SocketIO.listen(server); // server è un server HTTP già inizializzato io.sockets.on('connection', function(client) { // ... }); 

io.sockets.on('connection', function(client) { if (waiting.length == 0) { waiting.push(client); client.emit('waiting'); } else { var stranger = waiting.pop(); couples[client.id] = stranger; couples[stranger.id] = client; client.emit('partner'); stranger.emit('partner'); } // ... }); 

io.sockets.on('connection', function(client) { // ... client.on('message', function(message) { couples[client.id].emit('message', message); }); // ... }); 

io.sockets.on('connection', function(client) { // ... client.on('disconnect', function() { if (stranger = couples[client.id]) { stranger.emit('left'); delete couples[stranger.id]; delete couples[client.id]; } }); }); 

Client 

var socket = io.connect(); socket.on('waiting', function() { logMessage('Waiting for a stranger...'); }); socket.on('partner', function() { logMessage('You are now chatting with...'); }); socket.on('message', function(message) { logMessage(message); }); socket.on('left', function() { this.logMessage('Stranger has left...'); socket.disconnect(); }); 

var leaveConversation = function() { logMessage('You have left...'); socket.disconnect(); }; var sendMessage = function(message) { socket.emit('message', message); logMessage(message); }; 

Demo!