Added SubscribingConsumerEndpoint.

org.springframework.integration/src/main/java/org/springframework/integration/endpoint/SubscribingConsumerEndpoint.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2002-2008 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.endpoint;
+
+import org.springframework.context.Lifecycle;
+import org.springframework.integration.channel.SubscribableChannel;
+import org.springframework.integration.message.MessageConsumer;
+import org.springframework.util.Assert;
+
+/**
+ * @author Mark Fisher
+ */
+public class SubscribingConsumerEndpoint implements MessageEndpoint, Lifecycle {
+
+	private final MessageConsumer consumer;
+
+	private final SubscribableChannel inputChannel;
+
+	private volatile boolean running;
+
+	private final Object lifecycleMonitor = new Object();
+
+
+	public SubscribingConsumerEndpoint(MessageConsumer consumer, SubscribableChannel inputChannel) {
+		Assert.notNull(consumer, "consumer must not be null");
+		Assert.notNull(inputChannel, "inputChannel must not be null");
+		this.consumer = consumer;
+		this.inputChannel = inputChannel;
+	}
+
+
+	public boolean isRunning() {
+		synchronized (this.lifecycleMonitor) {
+			return this.running;
+		}
+	}
+
+	public void start() {
+		synchronized (this.lifecycleMonitor) {
+			if (!this.running) {
+				this.inputChannel.subscribe(this.consumer);
+				this.running = true;
+			}
+		}
+	}
+
+	public void stop() {
+		synchronized (this.lifecycleMonitor) {
+			if (this.running) {
+				this.inputChannel.unsubscribe(this.consumer);
+				this.running = false;
+			}
+		}
+	}
+
+}