Polish

spring-context/src/main/java/org/springframework/messaging/MessageChannel.java

@@ -16,6 +16,7 @@
 
 package org.springframework.messaging;
 
+
 /**
  * Base channel interface defining common behavior for sending messages.
  *
@@ -39,4 +40,17 @@ public interface MessageChannel {
 	 */
 	boolean send(Message<?> message);
 
+	/**
+	 * Send a message, blocking until either the message is accepted or the
+	 * specified timeout period elapses.
+	 *
+	 * @param message the {@link Message} to send
+	 * @param timeout the timeout in milliseconds
+	 *
+	 * @return <code>true</code> if the message is sent successfully,
+	 * <code>false</code> if the specified timeout period elapses or
+	 * the send is interrupted
+	 */
+	boolean send(Message<?> message, long timeout);
+
 }

spring-websocket/src/main/java/org/springframework/web/messaging/PubSubHeaders.java

@@ -51,19 +51,19 @@ public class PubSubHeaders {
 
 	protected Log logger = LogFactory.getLog(getClass());
 
-	private static final String DESTINATIONS = "destinations";
+	public static final String DESTINATIONS = "destinations";
 
-	private static final String CONTENT_TYPE = "contentType";
+	public static final String CONTENT_TYPE = "contentType";
 
-	private static final String MESSAGE_TYPE = "messageType";
+	public static final String MESSAGE_TYPE = "messageType";
 
-	private static final String PROTOCOL_MESSAGE_TYPE = "protocolMessageType";
+	public static final String PROTOCOL_MESSAGE_TYPE = "protocolMessageType";
 
-	private static final String SESSION_ID = "sessionId";
+	public static final String SESSION_ID = "sessionId";
 
-	private static final String SUBSCRIPTION_ID = "subscriptionId";
+	public static final String SUBSCRIPTION_ID = "subscriptionId";
 
-	private static final String EXTERNAL_SOURCE_HEADERS = "extSourceHeaders";
+	public static final String EXTERNAL_SOURCE_HEADERS = "extSourceHeaders";
 
 
 	private static final Map<String, List<String>> emptyMultiValueMap =

spring-websocket/src/main/java/org/springframework/web/messaging/stomp/StompHeaders.java

@@ -48,33 +48,33 @@ import reactor.util.Assert;
  */
 public class StompHeaders extends PubSubHeaders {
 
-	private static final String STOMP_ID = "id";
+	public static final String STOMP_ID = "id";
 
-	private static final String HOST = "host";
+	public static final String HOST = "host";
 
-	private static final String ACCEPT_VERSION = "accept-version";
+	public static final String ACCEPT_VERSION = "accept-version";
 
-	private static final String MESSAGE_ID = "message-id";
+	public static final String MESSAGE_ID = "message-id";
 
-	private static final String RECEIPT_ID = "receipt-id";
+	public static final String RECEIPT_ID = "receipt-id";
 
-	private static final String SUBSCRIPTION = "subscription";
+	public static final String SUBSCRIPTION = "subscription";
 
-	private static final String VERSION = "version";
+	public static final String VERSION = "version";
 
-	private static final String MESSAGE = "message";
+	public static final String MESSAGE = "message";
 
-	private static final String ACK = "ack";
+	public static final String ACK = "ack";
 
-	private static final String NACK = "nack";
+	public static final String NACK = "nack";
 
-	private static final String DESTINATION = "destination";
+	public static final String DESTINATION = "destination";
 
-	private static final String CONTENT_TYPE = "content-type";
+	public static final String CONTENT_TYPE = "content-type";
 
-	private static final String CONTENT_LENGTH = "content-length";
+	public static final String CONTENT_LENGTH = "content-length";
 
-	private static final String HEARTBEAT = "heart-beat";
+	public static final String HEARTBEAT = "heart-beat";
 
 
 	private static final String STOMP_HEADERS = "stompHeaders";