Official Tuscany 2.0.1 Release

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-Tuscany - Learning More - Binding Websocket - Chat Webapp
------------------------------------------------------------------
-
-This sample demonstrates how Tuscany can expose services via websockets as well
-as how to interact with them using Tuscany's javascript API. It also demonstrates
-how to push multiple responses from the server to the client for a single request
-using SCA callbacks.
-
-This project contains a service (ChatService) that handles chat operations like
-register and postMessage. Once a client is registered it will receive messages
-that are sent to the chat room.
-
-By adding <tuscany:binding.websocket port="8090"/> to a service definition, the 
-Tuscany runtime will start a websocket server listening for requests coming
-in for the exposed service at the specified port. If no port is specified, the
-runtime will use port 9000 as a default.  
-
-The websocket binding uses embedded Jetty instances as websocket servers. At the
-moment, Jetty 8.0.0-M3 is used which has support for the 00, 01, 06 and 07 
-versions of the websocket protocol drafts.
-
-IN ORDER TO RUN THIS SAMPLE SUCCESSFULLY PLEASE CHECK IF YOUR BROWSER SUPPORTS 
-THE ABOVE WEBSOCKET PROTOCOL VERSIONS AND THAT THE WEBSOCKET SUPPORT IS ENABLED.
-
-In order to enable callbacks to push multiple responses, you need to declare the 
-WebsocketBindingCallback in the service definition as follows:
-
-    <interface.java interface="sample.ChatService"
-                    callbackInterface="org.apache.tuscany.sca.binding.websocket.runtime.WebsocketBindingCallback" />
-    <tuscany:binding.websocket />
-    <callback>
-        <tuscany:binding.websocket />
-    </callback>
-    
-The callback object has methods that facilitate sending messages back to the 
-calling client. It can be injected in the service implementation using the @Callback
-annotation. However, the service implementation for this sample has the COMPOSITE
-scope so the callback reference has to be obtained from the ComponentContext.
-
-One requirement that service methods have to meet to enable multiple response 
-support is that they have to be annotated with @OneWay to enable non-blocking 
-support. Without it, methods are treated synchronously sending a single response
-which is the object returned by the method call.  
-
-The websocket binding also features a javascript API to simulate SCA in the 
-browser. In order to use it, the following script has to be included in the
-client page: 
-    <script type="text/javascript" 
-            src="org.apache.tuscany.sca.WebsocketComponentContext.js">
-    </script>
-	
-This will inject proxies for all services defined in the composite that are 
-using binding.websocket. All invocation and connection management is handled
-under the hood so in order to invoke a websocket service, the following should
-be called:
-	Tuscany.WebsocketComponentContext.<component name>.<service name>.<operation name>(<parameters>);
-
-Given the asynchornous nature of websockets, a function should be defined in
-order to handle responses received for a certain service operation. This should
-be done as follows:
-    Tuscany.WebsocketComponentContext.<component name>.<service name>.<operation name>.responseHandler = function(response) {
-        // handle response
-    };
-	
-Note that the data exchange is automatically handled by the binding, so parameters 
-will be mapped to the data types defined in the method definition. Also, the response 
-will have the same data type as the server side object used to wrap the response. 
-Objects are passed over the wire in JSON format.
-
-Another detail worth mentioning is that the binding will use a single persistent 
-websocket connection to handle communication between a browser client and all services 
-defined using binding.websocket on the same port. Requests and responses will get
-multiplexed via the same channel and get routed to the appropriate service 
-implementation, respectively javascript function.
-
-In order to run the sample, you can execute "mvn jetty:run" which will start a Jetty
-instance automatically or use "mvn package" and deploy the resulting war to the
-application server of your choice.
-
-Next, point your browser at 
-    http://localhost:8080/sample-binding-websocket-chat-webapp/
-	
-You can now chat using multiple tabs or browsers. You can see the persistent websocket 
-connection using the developer tools provided by your browser.
-
-The websocket binding is an experimental binding so community feedback is much 
-appreciated. Feel free to send comments or suggestions on the Apache Tuscany 
-dev mailing list (dev@tuscany.apache.org).
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