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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.service.discovery.jms;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.tuscany.spi.services.discovery.AbstractDiscoveryService;
import org.apache.tuscany.spi.services.discovery.DiscoveryException;
import org.apache.tuscany.spi.util.stax.StaxUtil;
import org.osoa.sca.annotations.Property;
/**
* JMS based implementation of the discovery service. This class uses
* ActiveMQ specific API instead of JNDI based administered objects. This can
* be changed later if required.
*
* @version $Revision$ $Date$
*/
public class JmsDiscoveryService extends AbstractDiscoveryService {
// Connection factory
private ConnectionFactory connectionFactory;
// Underlying JMS connection
private Connection connection;
// Session used for reception
private Session receiverSession;
// Message consumer
private MessageConsumer messageConsumer;
// Topic to use
private Topic topic;
// String broker url
private String brokerUrl = ActiveMQConnection.DEFAULT_BROKER_URL;
/**
* Injects the topic used for communication.
* @param topic Topic used for communication.
*/
@Property
public void setTopic(String topic) {
this.topic = new ActiveMQTopic(topic);
}
/**
* Injects the broker URL.
* @param brokerUrl Broker URL to use.
*/
@Property
public void setBrokerUrl(String brokerUrl) {
this.brokerUrl = brokerUrl;
}
/**
* Starts the service and sets up the message listener.
*/
@Override
protected synchronized void onStart() throws DiscoveryException {
String runtimeId = getRuntimeInfo().getRuntimeId();
try {
connectionFactory = new ActiveMQConnectionFactory(brokerUrl);
connection = connectionFactory.createConnection();
connection.setExceptionListener(new ExceptionListener() {
public void onException(JMSException jmsException) {
// Try restarting: TODO this may need further refinement
try {
onStop();
} catch (DiscoveryException ex) {
ex.printStackTrace();
}
try {
onStart();
} catch (DiscoveryException ex) {
ex.printStackTrace();
}
}
});
receiverSession = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
messageConsumer = receiverSession.createConsumer(topic);
final MessageListener messageListener = new TuscanyMessageListener(this, runtimeId);
messageConsumer.setMessageListener(messageListener);
connection.start();
} catch (JMSException ex) {
throw new DiscoveryException(ex);
}
}
/**
* Closes the connection.
*/
@Override
protected synchronized void onStop() throws DiscoveryException {
try {
receiverSession.close();
} catch (JMSException ex) {
throw new DiscoveryException(ex);
} finally {
try {
connection.close();
} catch (JMSException ex) {
throw new DiscoveryException(ex);
}
}
}
/**
* Sends the message.
*/
public synchronized int sendMessage(String runtimeId, XMLStreamReader reader) throws DiscoveryException {
try {
String text = StaxUtil.serialize(reader);
Session senderSession = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
MessageProducer messageProducer = senderSession.createProducer(topic);
TextMessage textMessage = senderSession.createTextMessage(text);
textMessage.setStringProperty("runtimeId", runtimeId);
messageProducer.send(textMessage);
senderSession.commit();
senderSession.close();
return 1;
} catch (XMLStreamException ex) {
throw new DiscoveryException(ex);
} catch (JMSException ex) {
throw new DiscoveryException(ex);
}
}
}
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