Experimental: Support Gradle --parallel

This should be treated as experimental but with these changes it seems to build ok.

BUILD SUCCESSFUL

Total time: 5 mins 15.533 secs

It turns out that our sporadic Redis problems were fixed in a later version of Jedis.

The problem was that the `connection.subscribe()` exited immediately. When I started adding debug
logic, the problem went away (because I was using a newer versio of Jedis).

spring-data-redis 1.5.2 is updated to work with the 2.7.3 version of Jedis.

Polishing

spring-integration-websocket/src/main/java/org/springframework/integration/websocket/ClientWebSocketContainer.java

@@ -49,6 +49,8 @@ import org.springframework.web.socket.client.WebSocketClient;
  */
 public final class ClientWebSocketContainer extends IntegrationWebSocketContainer implements SmartLifecycle {
 
+	private static final int DEFAULT_CONNECTION_TIMEOUT = 10;
+
 	private final WebSocketHttpHeaders headers = new WebSocketHttpHeaders();
 
 	private final ConnectionManagerSupport connectionManager;
@@ -59,6 +61,8 @@ public final class ClientWebSocketContainer extends IntegrationWebSocketContaine
 
 	private volatile Throwable openConnectionException;
 
+	private volatile int connectionTimeout = DEFAULT_CONNECTION_TIMEOUT;
+
 	public ClientWebSocketContainer(WebSocketClient client, String uriTemplate, Object... uriVariables) {
 		Assert.notNull(client, "'client' must not be null");
 		this.connectionManager = new IntegrationWebSocketConnectionManager(client, uriTemplate, uriVariables);
@@ -84,6 +88,15 @@ public final class ClientWebSocketContainer extends IntegrationWebSocketContaine
 		this.headers.putAll(headers);
 	}
 
+	/**
+	 * Set the connection timeout in seconds; default: 10.
+	 * @param connectionTimeout the timeout in seconds.
+	 * @since 4.2
+	 */
+	public void setConnectionTimeout(int connectionTimeout) {
+		this.connectionTimeout = connectionTimeout;
+	}
+
 	/**
 	 * Return the {@link #clientSession} {@link WebSocketSession}.
 	 * Independently of provided argument, this method always returns only the
@@ -95,7 +108,7 @@ public final class ClientWebSocketContainer extends IntegrationWebSocketContaine
 	public WebSocketSession getSession(String sessionId) {
 		if (this.isRunning()) {
 			try {
-				this.connectionLatch.await(10, TimeUnit.SECONDS);
+				this.connectionLatch.await(this.connectionTimeout, TimeUnit.SECONDS);
 			}
 			catch (InterruptedException e) {
 				logger.error("'clientSession' has not been established during 'openConnection'");

spring-integration-websocket/src/test/java/org/springframework/integration/websocket/ClientWebSocketContainerTests.java

@@ -66,6 +66,7 @@ public class ClientWebSocketContainerTests {
 
 		TestWebSocketListener messageListener = new TestWebSocketListener();
 		container.setMessageListener(messageListener);
+		container.setConnectionTimeout(30);
 
 		container.start();