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package org.mule.processor.chain; |
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import org.mule.OptimizedRequestContext; |
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import org.mule.api.MuleEvent; |
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import org.mule.api.MuleException; |
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import org.mule.api.component.Component; |
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import org.mule.api.construct.FlowConstruct; |
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import org.mule.api.endpoint.OutboundEndpoint; |
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import org.mule.api.processor.MessageProcessor; |
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import org.mule.api.processor.MessageProcessorChain; |
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import org.mule.api.transformer.Transformer; |
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import org.mule.construct.SimpleFlowConstruct; |
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import org.mule.context.notification.MessageProcessorNotification; |
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import org.mule.routing.MessageFilter; |
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import org.mule.routing.requestreply.ReplyToMessageProcessor; |
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import java.util.Arrays; |
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import java.util.Iterator; |
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import java.util.List; |
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public class DefaultMessageProcessorChain extends AbstractMessageProcessorChain |
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{ |
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protected DefaultMessageProcessorChain(List<MessageProcessor> processors) |
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{ |
32 | 0 | super(null, processors); |
33 | 0 | } |
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protected DefaultMessageProcessorChain(MessageProcessor... processors) |
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{ |
37 | 0 | super(null, Arrays.asList(processors)); |
38 | 0 | } |
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protected DefaultMessageProcessorChain(String name, List<MessageProcessor> processors) |
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{ |
42 | 0 | super(name, processors); |
43 | 0 | } |
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protected DefaultMessageProcessorChain(String name, MessageProcessor... processors) |
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{ |
47 | 0 | super(name, Arrays.asList(processors)); |
48 | 0 | } |
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public static MessageProcessorChain from(MessageProcessor messageProcessor) |
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{ |
52 | 0 | return new DefaultMessageProcessorChain(messageProcessor); |
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} |
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public static MessageProcessorChain from(MessageProcessor... messageProcessors) throws MuleException |
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{ |
57 | 0 | return new DefaultMessageProcessorChainBuilder().chain(messageProcessors).build(); |
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} |
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public static MessageProcessorChain from(List<MessageProcessor> messageProcessors) throws MuleException |
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{ |
62 | 0 | return new DefaultMessageProcessorChainBuilder().chain(messageProcessors).build(); |
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} |
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protected MuleEvent doProcess(MuleEvent event) throws MuleException |
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{ |
67 | 0 | FlowConstruct flowConstruct = event.getFlowConstruct(); |
68 | 0 | MuleEvent currentEvent = event; |
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MuleEvent resultEvent; |
70 | 0 | MuleEvent copy = null; |
71 | 0 | Iterator<MessageProcessor> processorIterator = processors.iterator(); |
72 | 0 | MessageProcessor processor = null; |
73 | 0 | if (processorIterator.hasNext()) |
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{ |
75 | 0 | processor = processorIterator.next(); |
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} |
77 | 0 | boolean resultWasNull = false; |
78 | 0 | while (processor != null) |
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{ |
80 | 0 | MessageProcessor nextProcessor = null; |
81 | 0 | if (processorIterator.hasNext()) |
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{ |
83 | 0 | nextProcessor = processorIterator.next(); |
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} |
85 | 0 | fireNotification(event.getFlowConstruct(), event, processor, |
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MessageProcessorNotification.MESSAGE_PROCESSOR_PRE_INVOKE); |
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|
88 | 0 | if (flowConstruct instanceof SimpleFlowConstruct && nextProcessor != null |
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&& processorMayReturnNull(processor)) |
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{ |
91 | 0 | copy = OptimizedRequestContext.criticalSetEvent(currentEvent); |
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} |
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|
94 | 0 | resultEvent = processor.process(currentEvent); |
95 | 0 | if (resultWasNull && processor instanceof ReplyToMessageProcessor) |
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{ |
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|
98 | 0 | resultEvent = null; |
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} |
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|
101 | 0 | fireNotification(event.getFlowConstruct(), resultEvent, processor, |
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MessageProcessorNotification.MESSAGE_PROCESSOR_POST_INVOKE); |
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|
104 | 0 | if (resultEvent != null) |
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{ |
106 | 0 | resultWasNull = false; |
107 | 0 | currentEvent = resultEvent; |
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} |
109 | 0 | else if (flowConstruct instanceof SimpleFlowConstruct && nextProcessor != null) |
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{ |
111 | 0 | resultWasNull = true; |
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|
116 | 0 | if (copy != null) |
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{ |
118 | 0 | currentEvent = copy; |
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} |
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else |
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{ |
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|
123 | 0 | currentEvent = OptimizedRequestContext.criticalSetEvent(currentEvent); |
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} |
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} |
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else |
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{ |
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|
129 | 0 | return null; |
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} |
131 | 0 | processor = nextProcessor; |
132 | 0 | } |
133 | 0 | return currentEvent; |
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} |
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protected boolean processorMayReturnNull(MessageProcessor processor) |
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{ |
138 | 0 | if (processor instanceof OutboundEndpoint) |
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{ |
140 | 0 | return !((OutboundEndpoint) processor).getExchangePattern().hasResponse(); |
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} |
142 | 0 | else if (processor instanceof Component || processor instanceof Transformer |
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|| processor instanceof MessageFilter) |
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{ |
145 | 0 | return false; |
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} |
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else |
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{ |
149 | 0 | return true; |
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} |
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} |
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|
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} |