messageBus.js

//labels
//subscribe to labels, needs to create a new label with users as properties, or an array of users
//with references to users, or their components

//multiple users need to access the same message bus

//have a handler for updating the data associated with each user

var messageBus = function() {
	this.topics = {}
	this.channels = {}
	this.subscribe = function(payload, user) {
		var topic = payload.topic;
		//handle channels
		if (payload.channel) {
			var channel = payload.channel
			if (channel in channels) {
				if (topic in this.channel.topics) {
			this.channels[channel].topics[topic].users.push(user)
		} else {
			this.channels[channel] = {
				topics: []
			}
			this.channels[channel].topics[topic] = {
				users: [],
				messages: []
			}
			this.channels[channel].topics[topic].users.push(user)
		}
			}
		} else { //regular case (no channel)
		if (topic in this.topics) {
			this.topics[topic].users.push(user)
		} else {
			this.topics[topic] = {
				users: [],
				messages: []
			}
			this.topics[topic].users.push(user)
		}
	}
		
	}.bind(this);
	this.publish = function(topic, message) {
		//todo implement channels
		if (!(topic in this.topics)) {
			throw err;
		} else {
			this.topics[topic].messages.push(message);
		}
		for (var i = 0; i<this.topics[topic].users.length; i++) {
			this.topics[topic].users.notify(); //notify defined client side
		}
	}.bind(this);
}