Added initial implementation of JmsOutboundGateway.

org.springframework.integration.jms/src/main/java/org/springframework/integration/jms/JmsOutboundGateway.java

@@ -0,0 +1,78 @@
+/*
+ * 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.jms;
+
+import java.io.Serializable;
+
+import javax.jms.JMSException;
+import javax.jms.Queue;
+import javax.jms.QueueRequestor;
+import javax.jms.QueueSession;
+import javax.jms.Session;
+
+import org.springframework.integration.core.Message;
+import org.springframework.integration.endpoint.AbstractReplyProducingMessageConsumer;
+import org.springframework.integration.endpoint.ReplyMessageHolder;
+import org.springframework.jms.core.JmsTemplate;
+import org.springframework.jms.core.SessionCallback;
+import org.springframework.jms.support.converter.MessageConverter;
+import org.springframework.util.Assert;
+
+/**
+ * An outbound Messaging Gateway for request/reply JMS.
+ * 
+ * @author Mark Fisher
+ */
+public class JmsOutboundGateway extends AbstractReplyProducingMessageConsumer {
+
+	private volatile Queue jmsQueue;
+
+	private volatile JmsTemplate jmsTemplate;
+
+	private volatile MessageConverter messageConverter;
+
+
+	public void setJmsQueue(Queue jmsQueue) {
+		this.jmsQueue = jmsQueue;
+	}
+
+	public void setJmsTemplate(JmsTemplate jmsTemplate) {
+		this.jmsTemplate = jmsTemplate;
+		this.messageConverter = new HeaderMappingMessageConverter(jmsTemplate.getMessageConverter());
+	}
+
+	@Override
+	protected void onMessage(final Message<?> requestMessage, final ReplyMessageHolder replyMessageHolder) {
+		this.jmsTemplate.execute(new SessionCallback() {
+			public Object doInJms(Session session) throws JMSException {
+				Assert.state(session instanceof QueueSession,
+						"QueueSession is required for the outbound JMS Gateway");
+				Assert.state(jmsQueue != null, "Queue is required");
+				javax.jms.Message jmsRequest = (messageConverter != null)
+						? messageConverter.toMessage(requestMessage, session)
+						: session.createObjectMessage((Serializable) requestMessage);
+				QueueRequestor requestor = new QueueRequestor((QueueSession) session, jmsQueue);
+				javax.jms.Message jmsReply = requestor.request(jmsRequest);
+				Object result = (messageConverter != null)
+						? messageConverter.fromMessage(jmsReply) : jmsReply;
+				replyMessageHolder.set(result);
+				return null;
+			}
+		}, true);
+	}
+
+}