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1 /*** 2 * Redistribution and use of this software and associated documentation 3 * ("Software"), with or without modification, are permitted provided 4 * that the following conditions are met: 5 * 6 * 1. Redistributions of source code must retain copyright 7 * statements and notices. Redistributions must also contain a 8 * copy of this document. 9 * 10 * 2. Redistributions in binary form must reproduce the 11 * above copyright notice, this list of conditions and the 12 * following disclaimer in the documentation and/or other 13 * materials provided with the distribution. 14 * 15 * 3. The name "Exolab" must not be used to endorse or promote 16 * products derived from this Software without prior written 17 * permission of Exoffice Technologies. For written permission, 18 * please contact tma@netspace.net.au. 19 * 20 * 4. Products derived from this Software may not be called "Exolab" 21 * nor may "Exolab" appear in their names without prior written 22 * permission of Exoffice Technologies. Exolab is a registered 23 * trademark of Exoffice Technologies. 24 * 25 * 5. Due credit should be given to the Exolab Project 26 * (http://www.exolab.org/). 27 * 28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 39 * OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Copyright 2001-2004 (C) Exoffice Technologies Inc. All Rights Reserved. 42 * 43 * $Id: EchoListener.java,v 1.3 2004/01/31 13:44:24 tanderson Exp $ 44 */ 45 package org.exolab.jmscts.core; 46 47 import javax.jms.Message; 48 import javax.jms.MessageListener; 49 import javax.jms.Session; 50 51 import org.apache.log4j.Category; 52 53 54 /*** 55 * This helper class implements the {@link MessageListener} interface and 56 * echoes messages to another destination 57 * 58 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a> 59 * @version $Revision: 1.3 $ 60 */ 61 public class EchoListener implements MessageListener { 62 63 /*** 64 * The underlying session 65 */ 66 private Session _session; 67 68 /*** 69 * The sender to echo messages 70 */ 71 private MessageSender _sender; 72 73 /*** 74 * The number of messages to send 75 */ 76 private int _count = 0; 77 78 /*** 79 * Determines if transacted sessions should be committed 80 */ 81 private boolean _commit = false; 82 83 /*** 84 * The logging category 85 */ 86 private static final Category log = 87 Category.getInstance(EchoListener.class.getName()); 88 89 90 /*** 91 * Construct an instance with the sender, the number of messages to 92 * send when {@link #onMessage} is invoked 93 * 94 * @param sender the message sender 95 * @param count the number of messages to send 96 */ 97 public EchoListener(MessageSender sender, int count) { 98 this(null, sender, count, false); 99 } 100 101 /*** 102 * Construct an instance with the session, sender, the number of messages 103 * to send when {@link #onMessage} is invoked. 104 * 105 * @param session the underlying session 106 * @param sender the message sender 107 * @param count the number of messages to send 108 * @param commit if <code>true</code> and the session is transacted, commit 109 * the session after sending the messages 110 */ 111 public EchoListener(Session session, MessageSender sender, int count, 112 boolean commit) { 113 _session = session; 114 _sender = sender; 115 _count = count; 116 _commit = commit; 117 } 118 119 /*** 120 * Invoked when the consumer asynchronously receives a message 121 * 122 * @param message the received message 123 */ 124 public void onMessage(Message message) { 125 try { 126 _sender.send(message, _count); 127 if (_commit) { 128 if (_session != null && _session.getTransacted()) { 129 _session.commit(); 130 } 131 } 132 } catch (Exception exception) { 133 log.error(exception, exception); 134 } 135 } 136 137 }

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