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Java > Open Source Codes > org > jboss > resource > adapter > jms > inflow > dlq > JBossMQDLQHandler


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.resource.adapter.jms.inflow.dlq;
23
24 import javax.jms.Message JavaDoc;
25 import javax.naming.Context JavaDoc;
26
27 import org.jboss.resource.adapter.jms.inflow.JmsActivation;
28
29 /**
30  * A DLQ Handler that knows about JBossMQ redelivery properties
31  *
32  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
33  * @version $Revision: 38315 $
34  */
35 public class JBossMQDLQHandler extends AbstractDLQHandler
36 {
37    /** Properties copied from org.jboss.mq.SpyMessage */
38    protected static final String JavaDoc JMS_JBOSS_REDELIVERY_COUNT = "JMS_JBOSS_REDELIVERY_COUNT";
39
40    /** Properties copied from org.jboss.mq.SpyMessage */
41    protected static final String JavaDoc JMS_JBOSS_REDELIVERY_LIMIT = "JMS_JBOSS_REDELIVERY_LIMIT";
42    
43    /** The maximum number of resends */
44    protected int maxResent;
45
46    public void setup(JmsActivation activation, Context JavaDoc ctx) throws Exception JavaDoc
47    {
48       super.setup(activation, ctx);
49       maxResent = activation.getActivationSpec().getDLQMaxResent();
50    }
51    
52    protected boolean handleDelivery(Message JavaDoc msg)
53    {
54       int max = maxResent;
55       try
56       {
57          if (msg.propertyExists(JMS_JBOSS_REDELIVERY_LIMIT))
58             max = msg.getIntProperty(JMS_JBOSS_REDELIVERY_LIMIT);
59
60          if (msg.propertyExists(JMS_JBOSS_REDELIVERY_COUNT))
61          {
62             int count = msg.getIntProperty(JMS_JBOSS_REDELIVERY_COUNT);
63          
64             if (count > max)
65             {
66                warnDLQ(msg, count, max);
67                return true;
68             }
69          }
70       }
71       catch (Throwable JavaDoc t)
72       {
73          log.warn("Unexpected error retrieving message properties " + msg, t);
74       }
75       return false;
76    }
77 }
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