Add WebSocket Support

Fixes gh-35

samples/websocket/src/main/java/sample/config/WebSocketConfig.java

@@ -0,0 +1,44 @@
+package sample.config;
+
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.simp.SimpMessageSendingOperations;
+import org.springframework.messaging.simp.config.MessageBrokerRegistry;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.session.ExpiringSession;
+import org.springframework.session.web.socket.config.annotation.AbstractSessionWebSocketMessageBrokerConfigurer;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
+import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
+
+import sample.data.ActiveWebSocketUserRepository;
+import sample.websocket.WebSocketConnectHandler;
+import sample.websocket.WebSocketDisconnectHandler;
+
+@Configuration
+@EnableScheduling
+@EnableWebSocketMessageBroker
+public class WebSocketConfig<S extends ExpiringSession> extends AbstractSessionWebSocketMessageBrokerConfigurer<S> {
+
+    @Bean
+    public WebSocketConnectHandler<S> webSocketConnectHandler(SimpMessageSendingOperations messagingTemplate, ActiveWebSocketUserRepository repository) {
+        return new WebSocketConnectHandler<S>(messagingTemplate, repository);
+    }
+
+    @Override
+    protected void configureStompEndpoints(StompEndpointRegistry registry) {
+        registry.addEndpoint("/messages")
+                .withSockJS();
+    }
+
+    @Override
+    public void configureMessageBroker(MessageBrokerRegistry registry) {
+        registry.enableSimpleBroker("/queue/", "/topic/");
+        registry.setApplicationDestinationPrefixes("/app");
+    }
+
+    @Bean
+    public WebSocketDisconnectHandler<S> webSocketDisconnectHandler(SimpMessageSendingOperations messagingTemplate, ActiveWebSocketUserRepository repository) {
+        return new WebSocketDisconnectHandler<S>(messagingTemplate, repository);
+    }
+}