Add MessageHandlingRunnable

Issue: SPR-12272

Author: rstoyanchev

spring-messaging/src/main/java/org/springframework/messaging/support/ExecutorSubscribableChannel.java

@@ -101,7 +101,7 @@ public boolean sendInternal(Message<?> message, long timeout) {
 	/**
 	 * Invoke a MessageHandler with ExecutorChannelInterceptor's.
 	 */
-	private class SendTask implements Runnable {
+	private class SendTask implements MessageHandlingRunnable {
 
 		private final Message<?> inputMessage;
 
@@ -115,6 +115,17 @@ public SendTask(Message<?> message, MessageHandler handler) {
 			this.handler = handler;
 		}
 
+
+		@Override
+		public Message<?> getMessage() {
+			return this.inputMessage;
+		}
+
+		@Override
+		public MessageHandler getMessageHandler() {
+			return this.getMessageHandler();
+		}
+
 		@Override
 		public void run() {
 			Message<?> message = this.inputMessage;

spring-messaging/src/main/java/org/springframework/messaging/support/MessageHandlingRunnable.java

@@ -0,0 +1,25 @@
+package org.springframework.messaging.support;
+
+import org.springframework.messaging.Message;
+import org.springframework.messaging.MessageHandler;
+
+/**
+ * Extension of the Runnable interface with methods to obtain the MessageHandler
+ * and Message to be handled.
+ *
+ * @author Rossen Stoyanchev
+ * @since 4.1
+ */
+public interface MessageHandlingRunnable extends Runnable {
+
+	/**
+	 * Return the Message that will be handled.
+	 */
+	Message<?> getMessage();
+
+	/**
+	 * Return the MessageHandler that will be used to handle the message.
+	 */
+	MessageHandler getMessageHandler();
+
+}

spring-messaging/src/main/java/org/springframework/messaging/support/Test.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2002-2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.messaging.support;
+
+/**
+ * @author Rossen Stoyanchev
+ * @since 4.1
+ */
+public class Test {
+
+	public static void main(String[] args) {
+
+		ExecutorSubscribableChannel.ExecutorSubscribableChannelTask task = null;
+
+	}
+
+}