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package org.mule.transport.jms; |
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import org.mule.config.i18n.CoreMessages; |
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import java.util.Enumeration; |
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import java.util.concurrent.atomic.AtomicReference; |
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import javax.jms.ConnectionMetaData; |
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import javax.jms.JMSException; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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public class AutoDiscoveryRedeliveryHandlerFactory implements RedeliveryHandlerFactory |
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{ |
34 | 0 | protected final Log logger = LogFactory.getLog(getClass()); |
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36 | 0 | protected AtomicReference<RedeliveryHandler> delegateHandler = new AtomicReference<RedeliveryHandler>(null); |
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protected JmsConnector connector; |
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public AutoDiscoveryRedeliveryHandlerFactory(JmsConnector connector) |
41 | 0 | { |
42 | 0 | if (connector == null) |
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{ |
44 | 0 | throw new IllegalArgumentException(CoreMessages.objectIsNull("connector").getMessage()); |
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} |
46 | 0 | this.connector = connector; |
47 | 0 | } |
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public RedeliveryHandler create() |
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{ |
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RedeliveryHandler result; |
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54 | 0 | if (delegateHandler.get() == null) |
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{ |
56 | 0 | RedeliveryHandler newInstance = createInstance(); |
57 | 0 | boolean ok = delegateHandler.compareAndSet(null, newInstance); |
58 | 0 | if (!ok) |
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{ |
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61 | 0 | result = delegateHandler.get(); |
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} |
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else |
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{ |
65 | 0 | result = newInstance; |
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} |
67 | 0 | } |
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else |
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{ |
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71 | 0 | result = delegateHandler.get(); |
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} |
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74 | 0 | return result; |
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} |
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protected RedeliveryHandler createInstance() |
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{ |
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RedeliveryHandler newInstance; |
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try |
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{ |
87 | 0 | ConnectionMetaData metaData = connector.getConnection().getMetaData(); |
88 | 0 | boolean supportsDeliveryCount = false; |
89 | 0 | final Enumeration propNames = metaData.getJMSXPropertyNames(); |
90 | 0 | while (propNames.hasMoreElements()) |
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{ |
92 | 0 | String p = (String) propNames.nextElement(); |
93 | 0 | if (JmsConstants.JMS_X_DELIVERY_COUNT.equals(p)) |
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{ |
95 | 0 | supportsDeliveryCount = true; |
96 | 0 | break; |
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} |
98 | 0 | } |
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100 | 0 | newInstance = (supportsDeliveryCount) ? new JmsXRedeliveryHandler() : new CountingRedeliveryHandler(); |
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} |
102 | 0 | catch (JMSException e) |
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{ |
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105 | 0 | newInstance = new CountingRedeliveryHandler(); |
106 | 0 | } |
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108 | 0 | if (logger.isDebugEnabled()) |
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{ |
110 | 0 | logger.debug("Using " + newInstance.getClass().getName()); |
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} |
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113 | 0 | return newInstance; |
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} |
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} |