postal.js/example/node/messaging/machina.postal.js

/*
    machina.postal.js
    Author: Jim Cowart
    License: Dual licensed MIT (http://www.opensource.org/licenses/mit-license) & GPL (http://www.opensource.org/licenses/gpl-license)
    Version 0.1.0
*/

module.exports = function(postal, machina) {
	var bus = machina.bus = {
		channels: {},
		config: {
			handlerChannelSuffix: "",
			eventChannelSuffix: ".events"
		},
		wireHandlersToBus: function(fsm, handlerChannel) {
			bus.channels[handlerChannel]._subscriptions.push(
				bus.channels[handlerChannel].subscribe("*", function(data, envelope){
					fsm.handle.call(fsm, envelope.topic, data, envelope);
				})
			);
		},
		wireEventsToBus: function(fsm, eventChannel) {
			var publisher = bus.channels[eventChannel].eventPublisher = function(){
				try {
					bus.channels[eventChannel].publish({ topic: arguments[0], data: arguments[1] || {} });
				} catch(exception) {
					if(console && typeof console.log !== "undefined") {
						console.log(exception.toString());
					}
				}
			};
			fsm.on("*", publisher);
		},
		wireUp: function(fsm) {
			var handlerChannel = fsm.namespace + bus.config.handlerChannelSuffix,
				eventChannel   = fsm.namespace + bus.config.eventChannelSuffix;
			bus.channels[handlerChannel] = postal.channel({ channel: handlerChannel });
			bus.channels[eventChannel] = postal.channel({ channel: eventChannel });
			bus.channels[handlerChannel]._subscriptions = [];
			bus.wireHandlersToBus(fsm, handlerChannel);
			bus.wireEventsToBus(fsm, eventChannel);
		}
	};
	machina.on("newFsm", bus.wireUp);
};