node-socket.io a node.js SocketManager Object

/** 
 * SocketManager - Singleton to manage socket 'routing', live (in memory) sessions and message routing
 *
 * Requires Socket.IO-node and Socket.IO client libraries.
 *
 * Usage:
 *   in your main app.js file (or whereever you create the server)
 *
 *   var io = require('socket.io'),
 *       sm = require('socketmanager');
 *
 *   socket = io.listen(server);  // or io.listen(app) in express
 *
 *   sm.register(socket);
 *
 *   // Then Register methods that will be run based on the 'msgType' attribute sent from the client in each message
 *   sm.on('joinChat', function(client, messageJSON){
 *       // do something here (i.e. send message back to client, broadcast something, etc.)
 *   });
 *
 */
exports = function SocketManager(){

    socket: null,
    messageMethods: {},
    sessions: {},

    register: function(socket){
        var context = this;
        
        this.socket = socket;
        
        this.socket.on('connection', function(client){

            context.connect(client);

            client.on('message', function(msg){
                context.receive(client, msg);    
            });
            
            client.on('disconnect', function(){
                context.disconnect(client);
            });

        });
    },
    
    connect: function(client){
        this.sessions[client.sessionId] = client;
    },
    
    disconnect: function(client){
        delete this.sessions[client.sessionId];
    },
    
    receive: function(client, msg){
        var parsed = JSON.parse(msg);
        if (parsed.msgType && this.messageMethods[parsed.msgType]){
            this.messageMethods[parsed.msgType](client, parsed);
        }
    },
    
    on: function(methodName, closure){
        this[methodName] = closure;
    }

}();