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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.jmsexample.pubsub;
import javax.jms.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import java.util.Properties;
/**
* Publish messages to topics
*/
public class Publisher
{
/* Used in log output. */
private static final String CLASS="Publisher";
/**
* Run the message producer example.
* @param args Command line arguments.
*/
public static void main(String[] args)
{
Publisher publisher = new Publisher();
publisher.runTest();
}
private void runTest()
{
try
{
Properties properties=new Properties();
properties.load(this.getClass().getResourceAsStream("pubsub.properties"));
//Create the initial context
Context ctx=new InitialContext(properties);
// Declare the connection
ConnectionFactory conFac=(ConnectionFactory) ctx.lookup("qpidConnectionfactory");
TopicConnection connection= (TopicConnection) conFac.createConnection();
// Create a session on the connection
// This session is a default choice of non-transacted and uses the auto acknowledge feature of a session.
System.out.println(CLASS + ": Creating a non-transacted, auto-acknowledged session");
TopicSession session=connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
// Create a Message
TextMessage message;
System.out.println(CLASS + ": Creating a TestMessage to send to the topics");
message=session.createTextMessage();
// lookup the topics usa.weather
Topic topic = (Topic)ctx.lookup("usa.weather");
// Create a Message Publisher
System.out.println(CLASS + ": Creating a Message Publisher for topic usa.weather");
TopicPublisher messagePublisher=session.createPublisher(topic);
publishMessages(message, messagePublisher);
// lookup the topics usa.news
topic = (Topic)ctx.lookup("usa.news");
// Create a Message Publisher
System.out.println(CLASS + ": Creating a Message Publisher for topic usa.news");
messagePublisher=session.createPublisher(topic);
publishMessages(message, messagePublisher);
// lookup the topics europe.weather
topic = (Topic)ctx.lookup("europe.weather");
// Create a Message Publisher
System.out.println(CLASS + ": Creating a Message Publisher for topic europe.weather");
messagePublisher=session.createPublisher(topic);
publishMessages(message, messagePublisher);
// lookup the topics europe.news
topic = (Topic)ctx.lookup("europe.news");
// Create a Message Publisher
System.out.println(CLASS + ": Creating a Message Publisher for topic europe.news");
messagePublisher = session.createPublisher(topic);
publishMessages(message, messagePublisher);
// send the final message
message=session.createTextMessage("That's all, folks!");
topic = (Topic)ctx.lookup("control");
// Create a Message Publisher
messagePublisher = session.createPublisher(topic);
messagePublisher
.send(message, DeliveryMode.PERSISTENT, Message.DEFAULT_PRIORITY, Message.DEFAULT_TIME_TO_LIVE);
// Close the connection to the broker
System.out.println(CLASS + ": Closing connection");
connection.close();
// Close the JNDI reference
System.out.println(CLASS + ": Closing JNDI context");
ctx.close();
}
catch (Exception exp)
{
System.err.println(CLASS + ": Caught an Exception: " + exp);
}
}
private void publishMessages(TextMessage message, TopicPublisher messagePublisher) throws JMSException
{
// Loop to publish 5 messages.
for (int i=1; i <= 6; i++)
{
message.setText("message " + i);
System.out.println(CLASS + ": Sending " + message.getText());
messagePublisher
.send(message, DeliveryMode.PERSISTENT, Message.DEFAULT_PRIORITY, Message.DEFAULT_TIME_TO_LIVE);
}
}
}
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