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Posted to dev@commons.apache.org by js...@apache.org on 2002/11/11 12:49:06 UTC
cvs commit: jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/jms OnMessageTag.java JMSTagLibrary.java
jstrachan 2002/11/11 03:49:06
Modified: jelly/src/java/org/apache/commons/jelly/tags/jms
JMSTagLibrary.java
Added: jelly/src/java/org/apache/commons/jelly/tags/jms
OnMessageTag.java
Log:
Added a simple <jms:onMessage> tag which allows Jelly scripts to be used to script incoming JMS messages.
This allows Jelly to be used as a simple, declarative scripting engine for processing JMS messages.
Revision Changes Path
1.6 +1 -0 jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/jms/JMSTagLibrary.java
Index: JMSTagLibrary.java
===================================================================
RCS file: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/jms/JMSTagLibrary.java,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -r1.5 -r1.6
--- JMSTagLibrary.java 5 Nov 2002 13:06:13 -0000 1.5
+++ JMSTagLibrary.java 11 Nov 2002 11:49:06 -0000 1.6
@@ -76,6 +76,7 @@
registerTag("mapEntry", MapEntryTag.class);
registerTag("mapMessage", MapMessageTag.class);
registerTag("message", MessageTag.class);
+ registerTag("onMessage", OnMessageTag.class);
registerTag("objectMessage", ObjectMessageTag.class);
registerTag("property", PropertyTag.class);
registerTag("receive", ReceiveTag.class);
1.1 jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/jms/OnMessageTag.java
Index: OnMessageTag.java
===================================================================
/*
* $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTag.java,v 1.7 2002/05/17 15:18:12 jstrachan Exp $
* $Revision: 1.7 $
* $Date: 2002/05/17 15:18:12 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* $Id: DynamicTag.java,v 1.7 2002/05/17 15:18:12 jstrachan Exp $
*/
package org.apache.commons.jelly.tags.jms;
import javax.jms.Message;
import javax.jms.MessageListener;
import org.apache.commons.jelly.JellyContext;
import org.apache.commons.jelly.JellyException;
import org.apache.commons.jelly.Script;
import org.apache.commons.jelly.TagSupport;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* This tag creates a JMS MessageListener which will invoke this
* tag's body whenever a JMS Message is received. The JMS Message
* will be available via a variable, which defaults to the 'message'
* variable name, but can be overloaded by the var attribute.
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 1.7 $
*/
public class OnMessageTag extends TagSupport {
/** The Log to which logging calls will be made. */
private static final Log log = LogFactory.getLog(OnMessageTag.class);
private String var = "message";
public OnMessageTag() {
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws Exception {
ConsumerTag tag = (ConsumerTag) findAncestorWithClass(ConsumerTag.class);
if (tag == null) {
throw new JellyException("This tag must be nested within a ConsumerTag like the subscribe tag");
}
final JellyContext childContext = context.newJellyContext();
final Script script = getBody();
final XMLOutput childOutput = output;
MessageListener listener = new MessageListener() {
public void onMessage(Message message) {
childContext.setVariable(var, childContext);
try {
script.run(childContext, childOutput);
}
catch (Exception e) {
log.error("Caught exception processing message: " + message + ". Exception: " + e, e);
}
}
};
// perform the consumption
tag.setMessageListener(listener);
}
// Properties
//-------------------------------------------------------------------------
/**
* Sets the name of the variable used to make the JMS message available to this tags
* body when a message is received.
*/
public void setVar(String var) {
this.var = var;
}
}
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