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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/taglibs/beanshell/src/java/org/apache/commons/jelly/tags/beanshell/BeanShellExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $ 3 * $Revision: 1.1 $ 4 * $Date: 2002/05/21 07:58:55 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights 11 * reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. The end-user documentation included with the redistribution, if 26 * any, must include the following acknowlegement: 27 * "This product includes software developed by the 28 * Apache Software Foundation (http://www.apache.org/)." 29 * Alternately, this acknowlegement may appear in the software itself, 30 * if and wherever such third-party acknowlegements normally appear. 31 * 32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 33 * Foundation" must not be used to endorse or promote products derived 34 * from this software without prior written permission. For written 35 * permission, please contact apache@apache.org. 36 * 37 * 5. Products derived from this software may not be called "Apache" 38 * nor may "Apache" appear in their names without prior written 39 * permission of the Apache Group. 40 * 41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * ==================================================================== 54 * 55 * This software consists of voluntary contributions made by many 56 * individuals on behalf of the Apache Software Foundation. For more 57 * information on the Apache Software Foundation, please see 58 * <http://www.apache.org/>;. 59 * 60 * $Id: BeanShellExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.tags.jms; 63 64 import javax.jms.Destination; 65 import javax.jms.Message; 66 67 import org.apache.commons.jelly.JellyException; 68 import org.apache.commons.jelly.XMLOutput; 69 70 import org.apache.commons.logging.Log; 71 import org.apache.commons.logging.LogFactory; 72 73 /*** Receives a JMS message. 74 * 75 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 76 * @version $Revision: 1.1 $ 77 */ 78 public class ReceiveTag extends MessageOperationTag { 79 80 /*** The Log to which logging calls will be made. */ 81 private static final Log log = LogFactory.getLog(ReceiveTag.class); 82 83 private String var; 84 private long timeout = -1L; 85 86 public ReceiveTag() { 87 } 88 89 // Tag interface 90 //------------------------------------------------------------------------- 91 public void doTag(XMLOutput output) throws Exception { 92 // evaluate body as it may contain a <destination> tag 93 invokeBody(output); 94 95 Destination destination = getDestination(); 96 if ( destination == null ) { 97 throw new JellyException( "No destination specified. Either specify a 'destination' attribute or use a nested <jms:destination> tag" ); 98 } 99 Message message = null; 100 if ( timeout > 0 ) { 101 if ( log.isDebugEnabled() ) { 102 log.debug( "Receiving message on destination: " + destination + " with timeout: " + timeout ); 103 } 104 105 message = getConnection().receive( destination, timeout ); 106 } 107 else if ( timeout == 0 ) { 108 if ( log.isDebugEnabled() ) { 109 log.debug( "Receiving message on destination: " + destination + " with No Wait" ); 110 } 111 112 message = getConnection().receiveNoWait( destination ); 113 } 114 else { 115 if ( log.isDebugEnabled() ) { 116 log.debug( "Receiving message on destination: " + destination ); 117 } 118 message = getConnection().receive( destination ); 119 } 120 onMessage( message ); 121 } 122 123 // Properties 124 //------------------------------------------------------------------------- 125 public String getVar() { 126 return var; 127 } 128 129 /*** 130 * Sets the variable name to create for the received message, which will be null if no 131 * message could be returned in the given time period. 132 */ 133 public void setVar(String var) { 134 this.var = var; 135 } 136 137 public long getTimeout() { 138 return timeout; 139 } 140 141 /*** 142 * Sets the timeout period in milliseconds to wait for a message. A value 143 * of -1 will wait forever for a message. 144 */ 145 public void setTimeout(long timeout) { 146 this.timeout = timeout; 147 } 148 149 // Implementation methods 150 //------------------------------------------------------------------------- 151 152 /*** 153 * A strategy method which processes the incoming message, allowing derived classes 154 * to implement different processing methods 155 */ 156 protected void onMessage( Message message ) { 157 if ( message != null ) { 158 context.setVariable( var, message ); 159 } 160 else { 161 context.removeVariable( var ); 162 } 163 } 164 }

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