2. JSR 356 - Java API for Websocket
● Creating WebSocket Java components to handle bi-
directional WebSocket conversations
● Initiating and intercepting WebSocket events
● Creation and consumption of WebSocket text and binary
messages
● The abililty to define WebSocket protocols and content
models for an application
Heads up on JSR's
3. Heads up on JSR's (Contd.)
JSR 353 - JAva API for JSON processing
● Produce and consume JSON text in a streaming fashion
● Build a Java object model for JSON text using API classes
● Binding of JSON text to Java objects and vice versa.
4. Websocket - Server endpoint
@ServerEndpoint(value = "/HomeWS",
encoders = {DataEncoder.class},
decoders = {DataDecoder.class})
public class HomeWS {
@OnOpen
public void onOpen(Session peer) {}
@OnClose
public void onClose(Session peer) {}
@OnMessage
public void broadCastMessage(GameData figure, Session session) throws
IOException, EncodeException {
}
}
WebSocket - Server Endpoint
clients call
with this URL
5. Websocket - client endpoint
@ClientEndpoint(decoders = {DataDecoder.class}, encoders = {DataEncoder.class})
public class SignalChangeEndpointClient {
@OnOpen
public void onOpen(Session session) throws IOException, EncodeException {}
}
WebSocket - Client Endpoint
has no url value
6. public class DataDecoder implements Decoder.Text<GameData> {
@Override
public GameData decode(String string) throws DecodeException {
JsonObject jsonObject = Json.createReader(
new StringReader(string)).readObject();
return new GameData(jsonObject);
}
}
public class DataEncoder implements Encoder.Text<GameData> {
@Override
public String encode(GameData figure) throws EncodeException {
return figure.getJson().toString();
}
}
WebSocket - Message Carriers
7. this code could be used with any java object to initiate a websocket message
○ EJB
○ Servlet
○ JSF handler
WebSocket - Message Sending
Client
//...
WebSocketContainer container = ContainerProvider.getWebSocketContainer();
String uri = "ws://websocket.appserver.org/websocket"; // illustrative URL
container.connectToServer(SignalChangeEndpointClient.class, URI.create(uri));
//...
8. Artifacts
for the well grounded ....
Tyrus - a RI of JSR 356
http://tyrus.java.net/
for the impatient ....
GlassFish 4 (JEE7) - via Promoted builds
http://download.java.net/glassfish/4.0/promoted/
upcoming
WildFly
http://www.wildfly.org/
