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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