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 );
};