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From gemmellr <...@git.apache.org>
Subject [GitHub] qpid-jms pull request #7: Client+Server class additions - updated
Date Thu, 11 May 2017 18:58:46 GMT
Github user gemmellr commented on a diff in the pull request:

    https://github.com/apache/qpid-jms/pull/7#discussion_r116053494
  
    --- Diff: qpid-jms-examples/src/main/java/org/apache/qpid/jms/example/Client.java ---
    @@ -0,0 +1,106 @@
    +/*
    + *
    + * 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.jms.example;
    +
    +import javax.jms.Connection;
    +import javax.jms.ConnectionFactory;
    +import javax.jms.DeliveryMode;
    +import javax.jms.Destination;
    +import javax.jms.ExceptionListener;
    +import javax.jms.JMSException;
    +import javax.jms.Message;
    +import javax.jms.MessageConsumer;
    +import javax.jms.MessageProducer;
    +import javax.jms.Session;
    +import javax.jms.TemporaryQueue;
    +import javax.jms.TextMessage;
    +import javax.naming.Context;
    +import javax.naming.InitialContext;
    +
    +public class Client {
    +    private static final int DELIVERY_MODE = DeliveryMode.NON_PERSISTENT;
    +
    +    public static void main(String[] args) throws Exception {
    +        try {
    +            // The configuration for the Qpid InitialContextFactory has been supplied
in
    +            // a jndi.properties file in the classpath, which results in it being picked
    +            // up automatically by the InitialContext constructor.
    +            Context context = new InitialContext();
    +
    +            ConnectionFactory factory = (ConnectionFactory) context.lookup("myFactoryLookup");
    +            Destination queue = (Destination) context.lookup("myQueueLookup");
    +
    +            Connection connection = factory.createConnection(System.getProperty("USER"),
System.getProperty("PASSWORD"));
    +            connection.setExceptionListener(new MyExceptionListener());
    +            connection.start();
    +
    +            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    +
    +            //Creates a message and temporary queue to send to and from.
    +            int random = (int) (Math.random()*3);
    +            TextMessage messageToBeSent;
    +            if (random == 0) {
    +                messageToBeSent = session.createTextMessage("first example message");
    +            } else if (random == 1) {
    +                messageToBeSent = session.createTextMessage("second example message");
    +            } else {
    +                messageToBeSent = session.createTextMessage("third example message");
    +            }
    +
    +            TemporaryQueue tempQueue = session.createTemporaryQueue();
    +            messageToBeSent.setJMSReplyTo(tempQueue);
    +            MessageProducer messageProducer = session.createProducer(queue);
    +
    +            //Send the message
    +            messageProducer.send(messageToBeSent, DELIVERY_MODE, Message.DEFAULT_PRIORITY,
Message.DEFAULT_TIME_TO_LIVE);
    +            System.out.println("[CLIENT] The message with text \"" + messageToBeSent.getText()
+"\" has been sent.");
    +
    +            MessageConsumer messageConsumer = session.createConsumer(tempQueue);
    --- End diff --
    
    It would be better to move creation of the consumer on the response queue up to before
sending any request, to ensure there is a listener ready for the message. It often wont matter,
but there are some select cases it does so its best to have the examples show that.


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