Coverage Report - org.mule.transport.jms.redelivery.AutoDiscoveryRedeliveryHandlerFactory
 
Classes in this File Line Coverage Branch Coverage Complexity
AutoDiscoveryRedeliveryHandlerFactory
0%
0/32
0%
0/14
0
 
 1  
 /*
 2  
  * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 3  
  * The software in this package is published under the terms of the CPAL v1.0
 4  
  * license, a copy of which has been included with this distribution in the
 5  
  * LICENSE.txt file.
 6  
  */
 7  
 package org.mule.transport.jms.redelivery;
 8  
 
 9  
 import org.mule.config.i18n.CoreMessages;
 10  
 import org.mule.transport.jms.JmsConnector;
 11  
 import org.mule.transport.jms.JmsConstants;
 12  
 
 13  
 import java.util.Enumeration;
 14  
 import java.util.concurrent.atomic.AtomicReference;
 15  
 
 16  
 import javax.jms.ConnectionMetaData;
 17  
 import javax.jms.JMSException;
 18  
 
 19  
 import org.apache.commons.logging.Log;
 20  
 import org.apache.commons.logging.LogFactory;
 21  
 
 22  
 /**
 23  
  * This factory will consult JMS connection metadata for supported optional properties and use
 24  
  * those, if available, otherwise falling back to the manual counting of redeliveries.
 25  
  *
 26  
  * @see CountingRedeliveryHandlerFactory
 27  
  * @see org.mule.transport.jms.redelivery.JmsXRedeliveryHandlerFactory
 28  
  * @see javax.jms.ConnectionMetaData
 29  
  */
 30  
 public class AutoDiscoveryRedeliveryHandlerFactory implements RedeliveryHandlerFactory
 31  
 {
 32  0
     protected final Log logger = LogFactory.getLog(getClass());
 33  
 
 34  0
     protected AtomicReference<RedeliveryHandler> delegateHandler = new AtomicReference<RedeliveryHandler>(null);
 35  
 
 36  
     protected JmsConnector connector;
 37  
 
 38  
     public AutoDiscoveryRedeliveryHandlerFactory(JmsConnector connector)
 39  0
     {
 40  0
         if (connector == null)
 41  
         {
 42  0
             throw new IllegalArgumentException(CoreMessages.objectIsNull("connector").getMessage());
 43  
         }
 44  0
         this.connector = connector;
 45  0
     }
 46  
 
 47  
     public RedeliveryHandler create()
 48  
     {
 49  
         RedeliveryHandler result;
 50  
 
 51  
         // initialize, accounting for concurrency
 52  0
         if (delegateHandler.get() == null)
 53  
         {
 54  0
             RedeliveryHandler newInstance = createInstance();
 55  0
             boolean ok = delegateHandler.compareAndSet(null, newInstance);
 56  0
             if (!ok)
 57  
             {
 58  
                 // someone was faster to initialize it, use this ref instead
 59  0
                 result = delegateHandler.get();
 60  
             }
 61  
             else
 62  
             {
 63  0
                 result = newInstance;
 64  
             }
 65  0
         }
 66  
         else
 67  
         {
 68  
             // just re-use existing handler
 69  0
             result = delegateHandler.get();
 70  
         }
 71  
 
 72  0
         return result;
 73  
     }
 74  
 
 75  
     /**
 76  
      * Create an instance using the discovery mechanism.
 77  
      *
 78  
      * @return an implementation based on the results of discovery
 79  
      */
 80  
     protected RedeliveryHandler createInstance()
 81  
     {
 82  
         RedeliveryHandler newInstance;
 83  
         try
 84  
         {
 85  0
             ConnectionMetaData metaData = connector.getConnection().getMetaData();
 86  0
             boolean supportsDeliveryCount = false;
 87  0
             final Enumeration propNames = metaData.getJMSXPropertyNames();
 88  0
             while (propNames.hasMoreElements())
 89  
             {
 90  0
                 String p = (String) propNames.nextElement();
 91  0
                 if (JmsConstants.JMS_X_DELIVERY_COUNT.equals(p))
 92  
                 {
 93  0
                     supportsDeliveryCount = true;
 94  0
                     break;
 95  
                 }
 96  0
             }
 97  
 
 98  0
             newInstance = (supportsDeliveryCount) ? new JmsXRedeliveryHandler() : new CountingRedeliveryHandler();
 99  
         }
 100  0
         catch (JMSException e)
 101  
         {
 102  
             // fallback to defaults
 103  0
             newInstance = new CountingRedeliveryHandler();
 104  0
         }
 105  
 
 106  0
         if (logger.isDebugEnabled())
 107  
         {
 108  0
             logger.debug("Using " + newInstance.getClass().getName());
 109  
         }
 110  
 
 111  0
         return newInstance;
 112  
     }
 113  
 
 114  
 }