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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.qpid.example.publisher;
import org.apache.log4j.Logger;
import org.apache.qpid.client.AMQConnection;
import org.apache.qpid.jms.Session;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.DeliveryMode;
import javax.jms.Queue;
import javax.jms.MessageProducer;
import javax.jms.Connection;
import org.apache.qpid.example.shared.ConnectionException;
import org.apache.qpid.example.shared.Statics;
public class Publisher
{
private static final Logger _log = Logger.getLogger(Publisher.class);
protected Connection _connection;
protected Session _session;
private MessageProducer _producer;
protected String _destinationDir;
protected String _name = "Publisher";
protected Queue _destination;
//constructor for use with a single host
public Publisher(String host, int port, String clientID, String queueName,
String user, String password, String virtualPath, String destinationDir)
{
try
{
createConnection(host, port, clientID, user, password, virtualPath);
//create a transactional session
_session = (Session) _connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
//now using a queue rather than a topic
//AMQTopic destination = new AMQTopic(topicName);
//Queue is non-exclusive and not deleted when last consumer detaches
_destination = _session.createQueue(queueName);
//create a message producer
_producer = _session.createProducer(_destination);
//set destination dir for files that have been processed
_destinationDir = destinationDir;
_connection.start();
}
catch (Exception e)
{
e.printStackTrace();
_log.error(e);
}
}
//constructor that allows for multiple host details to be provided for failover
public Publisher(String hostdetails, String clientID, String queueName,
String user, String password, String virtualPath, String destinationDir)
{
try
{
if (queueName==null||queueName.length()==0)
{
queueName = Statics.QUEUE_NAME;
}
createConnectionWithFailover(hostdetails, clientID, user, password, virtualPath);
//create a transactional session
_session = (Session) _connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
//now using a queue rather than a topic
//AMQTopic destination = new AMQTopic(topicName);
//Queue is non-exclusive and not deleted when last consumer detaches
_destination = _session.createQueue(queueName);
//create a message producer
_producer = _session.createProducer(_destination);
//set destination dir for files that have been processed
_destinationDir = destinationDir;
_connection.start();
}
catch (Exception e)
{
e.printStackTrace();
_log.error(e);
}
}
/*
* Publishes a non-persistent message using transacted session
*/
public boolean sendMessage(Message message)
{
try
{
//Send message via our producer which is not persistent
_producer.send(message, DeliveryMode.NON_PERSISTENT, _producer.getPriority(), _producer.getTimeToLive());
//commit the message send and close the transaction
_session.commit();
}
catch (JMSException e)
{
//Have to assume our commit failed and rollback here
try
{
_session.rollback();
_log.error(e);
e.printStackTrace();
return false;
}
catch (JMSException j)
{
_log.error("Unable to rollback publish transaction ",e);
return false;
}
}
_log.info(_name + " finished sending message: " + message);
return true;
}
public void cleanup()
{
try
{
if (_connection != null)
{
_connection.stop();
_connection.close();
}
_connection = null;
_producer = null;
}
catch(Exception e)
{
System.err.println("Error trying to cleanup publisher " + e);
System.exit(1);
}
}
public Session getSession()
{
return _session;
}
public String getDestinationDir()
{
return _destinationDir;
}
public void setDestinationDir(String destinationDir)
{
_destinationDir = destinationDir;
}
//ONly using one set of host details
private void createConnection(String host, int port, String clientID, String user, String password, String virtualPath)
throws ConnectionException
{
try
{
_connection = new AMQConnection(host, port, user, password, clientID, virtualPath);
}
catch (Exception e)
{
throw new ConnectionException(e.toString());
}
}
//Create connection with more than one set of host details for failover
private void createConnectionWithFailover(String hostdetails, String clientID, String user, String password, String virtualPath)
throws ConnectionException
{
try
{
_connection = new AMQConnection(hostdetails, user, password, clientID, virtualPath);
}
catch (Exception e)
{
throw new ConnectionException(e.toString());
}
}
public String getName()
{
return _name;
}
public void setName(String _name) {
this._name = _name;
}
}
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