ecs.js

gistfile1.txt

// BIND FIX FOR OLDER BROWSERS
if( Function.prototype.bind ) {
} else {
	/** safari, why you no bind!? */
	Function.prototype.bind = function (bind) {
		var self = this;
		return function () {
			var args = Array.prototype.slice.call(arguments);
			return self.apply(bind || null, args);
		};
	};
}

/*!
 * \namespace ECSjs
 * \brief An javascript library to connect to ECS installation.
 * <br />Copyright (C) 2012 LAB at Rockwell Group http://lab.rockwellgroup.com
 *
 * @author      The Lab
 * @modified    03/30/2012
 * @version     0.0.2
 */

var ECSjs = {}
/*! \class ECSjs::Connection
	\brief Creates a new ECS connection with host
*/

ECSjs.Connection = function( framework ){
	this.bConnected	 = false
	this.framework = framework || "ecs";

	this.onConnectHooks		= [];
	this.onDisconnectHooks	= [];
	this.onMessageHooks		= [];
	this.onStartHooks		= [];
	this.onStopHooks		= [];
	this.onFileHooks		= [];
};


/*! \fn ECSjs::Connection::connect
 * \brief Setup ECS connection
 * \memberof ECSjs::Connection
 * \param role (optional) The ECS role that this application is fulfilling
 * \param host (optional) The host of the ecsc that this application should connect to. Defaults to 127.0.0.1. You must specify a host if you are connecting to a remote ECS server.
 * \param port (optional)  The port on the host of the ecsc that this application should connect to. Defaults to 7847 (ECS default). You must specify a port if you change the port your local or remote ECS server is running on.
 * 
 */

ECSjs.Connection.prototype.connect = function( host, port, channel, role ) {
	this.role		= role || "";
	this.host 		= host || "127.0.0.1";
	this.port 		= port || 7847;
	this.channel	= channel || "/";
	
	this.socket 			= new WebSocket("ws://"+this.host+":"+this.port+this.channel);
	this.socket._parent		= this;
	this.socket.onmessage 	= this.onWSMessage.bind(this);
	this.socket.onopen 		= this.onConnectionOpened.bind(this);
	this.socket.onclose 	= this.onConnectionClosed.bind(this);
};

/*!
 * \fn ECSjs::Connection::sendMessage
 * \brief Send an ECS message
 * \memberof ECSjs::Connection
 * \param key The name of the route you are sending.
 * \param value the value you are sending
*/
ECSjs.Connection.prototype.sendMessage = function( key, value ) {
	if (!this.bConnected){
		if (console) console.warn("Not connected!");
		return;
	}

	if( this.framework == "ecs" ) {
		this.socket.send( "<route_update><configs><config><name>"+key+"</name><value>"+value+"</value></config></configs></route_update>" );
	} else {
		value['route'] = key;
		this.socket.send( JSON.stringify(value) );
	}
};

/*!
 * \fn ECSjs::Connection::onMessage
 * \brief Pass in a function to receive messages from ECS
 * \memberof ECSjs::Connection
 * \param fun function you would like to be called; must catch (key, value)
*/

ECSjs.Connection.prototype.onMessage = function( fun ) {
	if ( typeof fun !== "function" ){
		console.warn( "method passed to ECSjs.Connection.onMessage is not a function");
	} else {
		// DEV NOTE: SHOULD WE CHECK FOR DUPLICATES?
		this.onMessageHooks.push( fun );
	}
};

/*!
 * \fn ECSjs::Connection::onConnect
 * \brief Pass in a function in your add a listener to "connect" events from ECS.
 * \memberof ECSjs::Connection
 * \param fun function you would like to be called
*/

ECSjs.Connection.prototype.onConnect = function( fun ) {
	if ( typeof fun !== "function" ){
		console.warn( "method passed to ECSjs.Connection.onConnect is not a function");
	} else {
		// DEV NOTE: SHOULD WE CHECK FOR DUPLICATES?
		this.onConnectHooks.push( fun );
	}
};

/*!
 * \fn ECSjs::Connection::onDisconnect
 * \brief Pass in a function in your add a listener to "disconnect" events
 * \memberof ECSjs::Connection
 * \param fun function you would like to be called
*/

ECSjs.Connection.prototype.onDisconnect = function( fun ) {
	if ( typeof fun !== "function" ){
		console.warn( "method passed to ECSjs.Connection.onDisconnect is not a function");
	} else {
		// DEV NOTE: SHOULD WE CHECK FOR DUPLICATES?
		this.onDisconnectHooks.push( fun );
	}
};

/*!
 * \fn ECSjs::Connection::onStart
 * \brief Pass in a function in your add a listener to "start" events from ECS.
 * \memberof ECSjs::Connection
 * \param fun function you would like to be called
*/

ECSjs.Connection.prototype.onStart = function( fun ) {
	if ( typeof fun !== "function" ){
		console.warn( "method passed to ECSjs.Connection.onStart is not a function");
	} else {
		// DEV NOTE: SHOULD WE CHECK FOR DUPLICATES?
		this.onStartHooks.push( fun );
	}
};

/*!
 * \fn ECSjs::Connection::onStop
 * \brief Pass in a function in your add a listener to "stop" events from ECS.
 * \memberof ECSjs::Connection
 * \param fun function you would like to be called
*/

ECSjs.Connection.prototype.onStop = function( fun ) {
	if ( typeof fun !== "function" ){
		console.warn( "method passed to ECSjs.Connection.onStop is not a function");
	} else {
		// DEV NOTE: SHOULD WE CHECK FOR DUPLICATES?
		this.onStopHooks.push( fun );
	}
};

/*!
 * \fn ECSjs::Connection::onFile
 * \brief Pass in a function to receive files from ECS
 * \memberof ECSjs::Connection
 * \param fun function you would like to be called; must catch (filepath)
*/

ECSjs.Connection.prototype.onFile = function( fun ) {
	if ( typeof fun !== "function" ){
		console.warn( "method passed to ECSjs.Connection.onFile is not a function");
	} else {
		// DEV NOTE: SHOULD WE CHECK FOR DUPLICATES?
		this.onFileHooks.push( fun );
	}
};

/*!
 * \fn ECSjs::Connection::onConnectionOpened
 * \memberof ECSjs::Connection
 * \private
*/
ECSjs.Connection.prototype.onConnectionOpened = function() {
	this.bConnected = true;
	if (console) console.log("ECS connected");
	if( this.framework == "ecs" ) {
		this.socket.send("<application_message><role>"+this.role+"</role></application_message>");
	}

	for (var i=0; i<this.onConnectHooks.length; i++){
		this.onConnectHooks[i]();
	};
};

/*!
 * \fn ECSjs::Connection::onConnectionClosed
 * \memberof ECSjs::Connection
 * \private
*/
ECSjs.Connection.prototype.onConnectionClosed = function() {
	this.bConnected = false;

	for (var i=0; i<this.onDisconnectHooks.length; i++){
		this.onDisconnectHooks[i]();
	};
};

/*!
 * \fn ECSjs::Connection::onWSMessage
 * \memberof ECSjs::Connection
 * \private
*/
ECSjs.Connection.prototype.onWSMessage = function( evt ) {
	if( this.framework == "ecs" ) {
		var xml;
		if (window.DOMParser){
		 	var parser=new DOMParser();
			xml = parser.parseFromString(evt.data, "text/xml");
		} else {
			// Internet Explorer 
			xml = new ActiveXObject("Microsoft.XMLDOM");
		  	xml.async=false;
		  	xml.loadXML(evt.data); 
		}
		
		if (evt.data.indexOf("route_update") >= 0) {
			var configs = xml.getElementsByTagName("configs")[0].childNodes;
	        for (var i=0; i < configs.length; i++) {
	        	var name 	= null;
	        	var value 	= null;
	        	var curConfig = configs[i];

	        	// Config name
	        	var n = curConfig.getElementsByTagName("name")[0];
	        	name = n.childNodes[0].nodeValue;
	        	
	        	// Config value
	        	var val = curConfig.getElementsByTagName("value")[0];
	        	value = val.childNodes[0].nodeValue;
	            
	            // Invoke route update method if we have a complete name/value pair
	            if (name != null && value != null) {
					for (var i=0; i<this.onMessageHooks.length; i++){
						this.onMessageHooks[i](name, value);
					};
	            }
	        }
		} else if (evt.data.indexOf("application_message") >= 0) {
			var action = xml.getElementsByTagName("action")[0];
			var a = action.childNodes[0].nodeValue;
			
			if (a == "start"){
				for (var i=0; i<this.onStartHooks.length; i++){
					this.onStartHooks[i]();
				};
			} else if (a == "stop"){
				for (var i=0; i<this.onStopHooks.length; i++) {
					this.onStopHooks[i]();
				}
			}
		} else if (evt.data.indexOf("file_transfer") >= 0) {
			var action = xml.getElementsByTagName("filepath")[0];
			var fp = action.childNodes[0].nodeValue;

			// Invoke the file transfer method with the file path
			if (fp != null && !fp.equals("")) {
				for (var i=0; i<this.onFileHooks.length; i++){
					this.onFileHooks[i](fp);
				}
			}
		}
	} else {
		var dataObj = JSON.parse( evt.data );
		if ( dataObj.route ) {
			for (var i=0; i<this.onMessageHooks.length; i++){
				this.onMessageHooks[i](dataObj.route, dataObj.data);
			};
		} else {
			for (var i=0; i<this.onMessageHooks.length; i++){
				this.onMessageHooks[i]( "route", dataObj );
			};
		}
	}
};

/** @constant */
ECSjs.ECS = "ecs";
/** @constant */
ECSjs.INTERACTIVE_SPACES = "interactiveSpaces";