| /* |
| * |
| * 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.simple.reqresp; |
| |
| import javax.jms.Connection; |
| import javax.jms.ConnectionFactory; |
| import javax.jms.Destination; |
| import javax.jms.JMSException; |
| import javax.jms.Message; |
| import javax.jms.MessageConsumer; |
| import javax.jms.MessageListener; |
| import javax.jms.MessageProducer; |
| import javax.jms.Queue; |
| import javax.jms.Session; |
| import javax.jms.TextMessage; |
| import javax.naming.Context; |
| import javax.naming.InitialContext; |
| import javax.naming.NamingException; |
| import java.util.Properties; |
| import java.util.concurrent.CountDownLatch; |
| |
| public class Client implements MessageListener |
| { |
| final String BROKER = "localhost"; |
| |
| final String INITIAL_CONTEXT_FACTORY = "org.apache.qpid.jndi.PropertiesFileInitialContextFactory"; |
| |
| final String CONNECTION_JNDI_NAME = "local"; |
| final String CONNECTION_NAME = "amqp://guest:guest@clientid/test?brokerlist='" + BROKER + "'"; |
| |
| final String QUEUE_JNDI_NAME = "queue"; |
| final String QUEUE_NAME = "example.RequestQueue"; |
| |
| |
| private InitialContext _ctx; |
| |
| private CountDownLatch _shutdownHook = new CountDownLatch(1); |
| |
| public Client() |
| { |
| setupJNDI(); |
| |
| Connection connection; |
| Session session; |
| Destination responseQueue; |
| |
| //Setup the connection. Create producer to sent message and consumer to receive the repsonse. |
| MessageProducer _producer; |
| try |
| { |
| connection = ((ConnectionFactory) lookupJNDI(CONNECTION_JNDI_NAME)).createConnection(); |
| |
| session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); |
| |
| Destination requestQueue = (Queue) lookupJNDI(QUEUE_JNDI_NAME); |
| |
| closeJNDI(); |
| |
| //Setup a message _producer to send message to the queue the server is consuming from |
| _producer = session.createProducer(requestQueue); |
| |
| //Create a temporary queue that this client will listen for responses on then create a consumer |
| //that consumes message from this temporary queue. |
| responseQueue = session.createTemporaryQueue(); |
| |
| MessageConsumer responseConsumer = session.createConsumer(responseQueue); |
| |
| //Set a listener to asynchronously deal with responses. |
| responseConsumer.setMessageListener(this); |
| |
| // Now the connection is setup up start it. |
| connection.start(); |
| } |
| catch (JMSException e) |
| { |
| System.err.println("Unable to setup connection, client and producer on broker"); |
| return; |
| } |
| |
| // Setup the message to send |
| TextMessage txtMessage; |
| try |
| { |
| //Now create the actual message you want to send |
| txtMessage = session.createTextMessage("Request Process"); |
| |
| //Set the reply to field to the temp queue you created above, this is the queue the server will respond to |
| txtMessage.setJMSReplyTo(responseQueue); |
| |
| //Set a correlation ID so when you get a response you know which sent message the response is for |
| //If there is never more than one outstanding message to the server then the |
| //same correlation ID can be used for all the messages...if there is more than one outstanding |
| //message to the server you would presumably want to associate the correlation ID with this message |
| |
| txtMessage.setJMSCorrelationID(txtMessage.getJMSMessageID()); |
| } |
| catch (JMSException e) |
| { |
| System.err.println("Unable to create message"); |
| return; |
| |
| } |
| |
| try |
| { |
| _producer.send(txtMessage); |
| } |
| catch (JMSException e) |
| { |
| //Handle the exception appropriately |
| } |
| |
| try |
| { |
| System.out.println("Sent Request Message ID :" + txtMessage.getJMSMessageID()); |
| } |
| catch (JMSException e) |
| { |
| //Handle exception more appropriately. |
| } |
| |
| //Wait for the return message to arrive |
| try |
| { |
| _shutdownHook.await(); |
| } |
| catch (InterruptedException e) |
| { |
| // Ignore this as we are quitting anyway. |
| } |
| |
| //Close the connection |
| try |
| { |
| connection.close(); |
| } |
| catch (JMSException e) |
| { |
| System.err.println("A problem occured while shutting down the connection : " + e); |
| } |
| } |
| |
| |
| /** |
| * Implementation of the Message Listener interface. |
| * This is where message will be asynchronously delivered. |
| * |
| * @param message |
| */ |
| public void onMessage(Message message) |
| { |
| String messageText; |
| try |
| { |
| if (message instanceof TextMessage) |
| { |
| TextMessage textMessage = (TextMessage) message; |
| messageText = textMessage.getText(); |
| System.out.println("messageText = " + messageText); |
| System.out.println("Correlation ID " + message.getJMSCorrelationID()); |
| |
| _shutdownHook.countDown(); |
| } |
| else |
| { |
| System.err.println("Unexpected message delivered"); |
| } |
| } |
| catch (JMSException e) |
| { |
| //Handle the exception appropriately |
| } |
| } |
| |
| /** |
| * Lookup the specified name in the JNDI Context. |
| * |
| * @param name The string name of the object to lookup |
| * |
| * @return The object or null if nothing exists for specified name |
| */ |
| private Object lookupJNDI(String name) |
| { |
| try |
| { |
| return _ctx.lookup(name); |
| } |
| catch (NamingException e) |
| { |
| System.err.println("Error looking up '" + name + "' in JNDI Context:" + e); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Setup the JNDI context. |
| * |
| * In this case we are simply using a Properties object to store the pairing information. |
| * |
| * Further details can be found on the wiki site here: |
| * |
| * @see : http://cwiki.apache.org/qpid/how-to-use-jndi.html |
| */ |
| private void setupJNDI() |
| { |
| // Set the properties ... |
| Properties properties = new Properties(); |
| properties.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY); |
| properties.put("connectionfactory." + CONNECTION_JNDI_NAME, CONNECTION_NAME); |
| properties.put("queue." + QUEUE_JNDI_NAME, QUEUE_NAME); |
| |
| // Create the initial context |
| Context ctx = null; |
| try |
| { |
| _ctx = new InitialContext(properties); |
| } |
| catch (NamingException e) |
| { |
| System.err.println("Error Setting up JNDI Context:" + e); |
| } |
| } |
| |
| /** Close the JNDI Context to keep everything happy. */ |
| private void closeJNDI() |
| { |
| try |
| { |
| _ctx.close(); |
| } |
| catch (NamingException e) |
| { |
| System.err.println("Unable to close JNDI Context : " + e); |
| } |
| } |
| |
| |
| public static void main(String[] args) |
| { |
| new Client(); |
| } |
| } |
| |