INT-975 Adding a MessageProducer interface with a single setOutputChannel() method.

org.springframework.integration/src/main/java/org/springframework/integration/core/MessageProducer.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2002-2010 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.integration.core;
+
+/**
+ * Base interface for any component that is capable of sending
+ * Messages to a {@link MessageChannel}.
+ * 
+ * @author Mark Fisher
+ * @since 2.0
+ */
+public interface MessageProducer {
+
+	/**
+	 * Specify the MessageChannel to which produced Messages should be sent.
+	 */
+	void setOutputChannel(MessageChannel outputChannel);
+
+}