Java tutorial
/* * 2001-2009, Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved. * * Licensed 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. Sample Application Queue/PTP Send and receive using multiple sessions and a temporary queue This sample shows the round trip time for a message being sent to the broker and received. A temporary queue is used to guarantee that each instance of this sample receives its own messages only. Usage: java QueueRoundTrip -b <broker:port> -u <username> -p <password> -n <numTests> -h Optional Parameters: -b broker:port Broker name and port of your message server Default: tcp://localhost:61616 -u username Default: user (username required) -p password Default: password (not checked) -n numTests The number of messages to be sent/received Default: 100 -h Prints help screen. */ import org.apache.activemq.*; public class QueueRoundTrip { private static final String DEFAULT_BROKER_NAME = "tcp://localhost:61616"; private static final String DEFAULT_PASSWORD = "password"; private static final String DEFAULT_USER_NAME = "user"; private static final int DEFAULT_NUM_TESTS = 100; private static final int msgSize = 1400; private static byte[] msgBody = new byte[msgSize]; private javax.jms.ConnectionFactory factory = null; private javax.jms.Connection connection = null; private javax.jms.Session sendSession = null; private javax.jms.Session receiveSession = null; private javax.jms.MessageProducer sender = null; private javax.jms.MessageConsumer receiver = null; private void QueueRoundTripper(String broker, String username, String password, int numTests) { try { //Set up two sessions, one for sending and the other for receiving factory = new ActiveMQConnectionFactory(username, password, broker); connection = factory.createConnection(username, password); sendSession = connection.createSession(false, javax.jms.Session.AUTO_ACKNOWLEDGE); receiveSession = connection.createSession(false, javax.jms.Session.AUTO_ACKNOWLEDGE); } catch (javax.jms.JMSException jmse) { System.err.println("error: Cannot connect to broker- " + broker + ".\n"); jmse.printStackTrace(); System.exit(1); } try { //Set up a temporary Queue: javax.jms.TemporaryQueue tempQueue = sendSession.createTemporaryQueue(); receiver = receiveSession.createConsumer(tempQueue); sender = sendSession.createProducer(tempQueue); connection.start(); } catch (javax.jms.JMSException jmse) { System.err.println("error: Connection couldn't be started.\n"); jmse.printStackTrace(); System.exit(1); } //Send messages using Temporary Queue: try { System.out.println("QueueRoundTrip application:"); System.out.println("==========================="); System.out.println("Sending Messages to Temporary Queue..."); //create a message to send javax.jms.BytesMessage msg = sendSession.createBytesMessage(); msg.writeBytes(msgBody); //send and receive the message the specified number of times: long time = System.currentTimeMillis(); for (int i = 0; i < numTests; i++) { sender.send(msg); msg = (javax.jms.BytesMessage) receiver.receive(); } time = System.currentTimeMillis() - time; System.out.println("\nTime for " + numTests + " sends and receives:\t\t" + time + "ms\n" + "Average Time per message:\t\t\t" + (float) time / (float) numTests + "ms\n"); System.out.println("\n\nPress Enter to close this window."); java.io.BufferedReader stdin = new java.io.BufferedReader(new java.io.InputStreamReader(System.in)); stdin.readLine(); System.exit(0); } catch (javax.jms.JMSException jmse) { System.err.println("error: message not sent/received.\n"); jmse.printStackTrace(); System.exit(1); } catch (java.io.IOException ioe) { ioe.printStackTrace(); } } /** Cleanup resources and then exit. */ private void exit() { try { connection.close(); } catch (javax.jms.JMSException jmse) { jmse.printStackTrace(); } System.exit(0); } public static void main(String argv[]) { // Values to be read from parameters String broker = DEFAULT_BROKER_NAME; String username = DEFAULT_USER_NAME; String password = DEFAULT_PASSWORD; int numTests = DEFAULT_NUM_TESTS; // Check parameters if (argv.length > 0) { for (int i = 0; i < argv.length; i++) { String arg = argv[i]; // Options if (!arg.startsWith("-")) { System.err.println("error: unexpected argument - " + arg); printUsage(); System.exit(1); } else { if (arg.equals("-b")) { if (i == argv.length - 1 || argv[i + 1].startsWith("-")) { System.err.println("error: missing broker name:port"); System.exit(1); } broker = argv[++i]; continue; } if (arg.equals("-u")) { if (i == argv.length - 1 || argv[i + 1].startsWith("-")) { System.err.println("error: missing user name"); System.exit(1); } username = argv[++i]; continue; } if (arg.equals("-p")) { if (i == argv.length - 1 || argv[i + 1].startsWith("-")) { System.err.println("error: missing password"); System.exit(1); } password = argv[++i]; continue; } if (arg.equals("-n")) { if (i == argv.length - 1 || argv[i + 1].startsWith("-")) { System.err.println("error: missing number of test to run."); System.exit(1); } numTests = (new Integer(argv[++i])).intValue(); continue; } if (arg.equals("-h")) { printUsage(); System.exit(1); } } } } // create the payload byte charToWrite = (0x30); for (int i = 0; i < msgSize; i++) { msgBody[i] = charToWrite; charToWrite = (byte) ((int) charToWrite + (int) 0x01); if (charToWrite == (0x39)) { charToWrite = (0x30); } } // Start the JMS client for the test. QueueRoundTrip queueRoundTripper = new QueueRoundTrip(); queueRoundTripper.QueueRoundTripper(broker, username, password, numTests); } private static void printUsage() { StringBuffer use = new StringBuffer(); use.append("Usage:\n"); use.append("java QueueRoundTrip (options)...\n\n"); use.append("options:\n"); use.append("-b broker:port Broker name and port of your message server\n"); use.append(" Default: tcp://localhost:61616\n"); use.append("-u username Default: user (username required)\n"); use.append("-p password Default: password (not checked)\n"); use.append("-n numTests The number of messages to be sent/received\n"); use.append(" Default: 100\n"); use.append("-h This help screen"); System.err.println(use); } }