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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.requestResponse;
import javax.jms.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import java.util.Properties;
/**
* This example illustrates the use of the JMS utility class <code>QueueRequestor</code>
* which provides a synchronous RPC-like abstraction using temporary destinations
* to deliver responses back to the client.
*/
public class Client
{
/* Used in log output. */
private static final String CLASS="Client";
/**
* Run the message requestor example.
*
* @param args Command line arguments.
*/
public static void main(String[] args)
{
Client requestor=new Client();
requestor.runTest();
}
/**
* Start the example.
*/
private void runTest()
{
try
{
// Load JNDI properties
Properties properties=new Properties();
properties.load(this.getClass().getResourceAsStream("requestResponse.properties"));
//Create the initial context
Context ctx=new InitialContext(properties);
// Lookup the connection factory
ConnectionFactory conFac = (ConnectionFactory) ctx.lookup("qpidConnectionfactory");
// create the connection
QueueConnection connection = (QueueConnection) conFac.createConnection();
// As this application is using a MessageConsumer we need to set an ExceptionListener on the connection
// so that errors raised within the JMS client library can be reported to the application
System.out.println(
CLASS + ": Setting an ExceptionListener on the connection as sample uses a MessageConsumer");
connection.setExceptionListener(new ExceptionListener()
{
public void onException(JMSException jmse)
{
// The connection may have broken invoke reconnect code if available.
// The connection may have broken invoke reconnect code if available.
System.err.println(CLASS + ": The sample received an exception through the ExceptionListener");
System.exit(0);
}
});
// Create a session on the connection.
System.out.println(CLASS + ": Creating a non-transacted, auto-acknowledged session");
QueueSession session = connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
// Lookup the destination
Queue destination = (Queue) ctx.lookup("requestQueue");
// Create a QueueRequestor
System.out.println(CLASS + ": Creating a QueueRequestor");
QueueRequestor requestor = new QueueRequestor(session, destination);
// Now start the connection
System.out.println(CLASS + ": Starting connection");
connection.start();
// Create a message to send as a request for service
TextMessage request;
// Send some messages to the server's request queue
String[] messages = {"Twas brillig, and the slithy toves",
"Did gire and gymble in the wabe.",
"All mimsy were the borogroves,",
"And the mome raths outgrabe."};
// Get the number of times that this sample should request service
for (String message : messages)
{
request = session.createTextMessage(message);
sendReceive(request, requestor);
}
// Close the connection to the server
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 sendReceive(TextMessage request, QueueRequestor requestor) throws JMSException
{
Message response;
response=requestor.request(request);
System.out.println(CLASS + ": \tRequest Content= " + request.getText());
// Print out the details of the response received
String text;
if (response instanceof TextMessage)
{
text=((TextMessage) response).getText();
}
else
{
byte[] body=new byte[(int) ((BytesMessage) response).getBodyLength()];
((BytesMessage) response).readBytes(body);
text=new String(body);
}
System.out.println(CLASS + ": \tResponse Content= " + text);
}
}
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