/**
* JBoss, Home of Professional Open Source
* Copyright Red Hat, Inc., and individual contributors.
*
* 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.jboss.aerogear.unifiedpush.message.jms;
import javax.annotation.Resource;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.jms.Queue;
import javax.jms.Topic;
import org.jboss.aerogear.unifiedpush.message.exception.MessageDeliveryException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Abstract base for message driven beans that receives a {@link javax.jms.ObjectMessage} from a queue, validates its type, cast it to a generic type T and pass for processing to abstract method {@link #onMessage(Object)}
*/
public abstract class AbstractJMSMessageListener<T> implements MessageListener {
@Resource(mappedName = "java:/ConnectionFactory")
private ConnectionFactory connectionFactory;
private final Logger logger = LoggerFactory.getLogger(AbstractJMSMessageListener.class);
public abstract void onMessage(T message);
@SuppressWarnings("unchecked")
@Override
public void onMessage(Message jmsMessage) {
try {
if (jmsMessage instanceof ObjectMessage) {
Object messageObject = ((ObjectMessage) jmsMessage).getObject();
try {
T message = (T) messageObject;
onMessage(message);
} catch (ClassCastException e) {
throw new IllegalStateException("Received message of wrong payload type " + messageObject.getClass() + " to destination " + getDestinationName(jmsMessage));
}
} else {
logger.warn("Received message of wrong type {} to destination {}",
jmsMessage.getClass().getName(), getDestinationName(jmsMessage));
}
} catch (JMSException e) {
throw new MessageDeliveryException("Failed to handle message from destination " + getDestinationName(jmsMessage), e);
}
}
private static String getDestinationName(Message message) {
try {
Destination destination = message.getJMSDestination();
if (destination instanceof Queue) {
return ((Queue) destination).getQueueName();
} else if (destination instanceof Topic) {
return ((Topic) destination).getTopicName();
} else {
throw new IllegalStateException("Can't recognize destination type for " + destination.getClass());
}
} catch (JMSException e) {
throw new IllegalStateException("Can't extract destination name from JMS message: " + message, e);
}
}
}