org.apache.camel.processor.idempotent
Class IdempotentConsumer

java.lang.Object
  extended by org.apache.camel.impl.ServiceSupport
      extended by org.apache.camel.processor.idempotent.IdempotentConsumer
All Implemented Interfaces:
AsyncProcessor, Navigate<Processor>, Processor, Service, ShutdownableService

public class IdempotentConsumer
extends ServiceSupport
implements AsyncProcessor, Navigate<Processor>

An implementation of the Idempotent Consumer pattern.

Version:

Constructor Summary
IdempotentConsumer(Expression messageIdExpression, IdempotentRepository<String> idempotentRepository, boolean eager, Processor processor)
           
 
Method Summary
protected  void doStart()
           
protected  void doStop()
           
 IdempotentRepository<String> getIdempotentRepository()
           
 Expression getMessageIdExpression()
           
 Processor getProcessor()
           
 boolean hasNext()
          Are there more outputs?
 List<Processor> next()
          Next group of outputs
protected  void onDuplicateMessage(Exchange exchange, String messageId)
          A strategy method to allow derived classes to overload the behaviour of processing a duplicate message
 void process(Exchange exchange)
          Processes the message exchange
 boolean process(Exchange exchange, AsyncCallback callback)
          Processes the message exchange.
 String toString()
           
 
Methods inherited from class org.apache.camel.impl.ServiceSupport
addChildService, doResume, doShutdown, doSuspend, getStatus, getVersion, isRunAllowed, isStarted, isStarting, isStopped, isStopping, isSuspended, isSuspending, removeChildService, resume, shutdown, start, start, stop, suspend
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

IdempotentConsumer

public IdempotentConsumer(Expression messageIdExpression,
                          IdempotentRepository<String> idempotentRepository,
                          boolean eager,
                          Processor processor)
Method Detail

toString

public String toString()
Overrides:
toString in class Object

process

public void process(Exchange exchange)
             throws Exception
Description copied from interface: Processor
Processes the message exchange

Specified by:
process in interface Processor
Parameters:
exchange - the message exchange
Throws:
Exception - if an internal processing error has occurred.

process

public boolean process(Exchange exchange,
                       AsyncCallback callback)
Description copied from interface: AsyncProcessor
Processes the message exchange. Similar to Processor.process(org.apache.camel.Exchange), but the caller supports having the exchange asynchronously processed.

If there was a failure processing then the caused Exception would be set on the Exchange.

Specified by:
process in interface AsyncProcessor
Parameters:
exchange - the message exchange
callback - the AsyncCallback will be invoked when the processing of the exchange is completed. If the exchange is completed synchronously, then the callback is also invoked synchronously. The callback should therefore be careful of starting recursive loop.
Returns:
(doneSync) true to continue execute synchronously, false to continue being executed asynchronously
See Also:
AsyncProcessorHelper.process(AsyncProcessor, Exchange, AsyncCallback)

next

public List<Processor> next()
Description copied from interface: Navigate
Next group of outputs

Specified by:
next in interface Navigate<Processor>
Returns:
next group or null if no more outputs

hasNext

public boolean hasNext()
Description copied from interface: Navigate
Are there more outputs?

Specified by:
hasNext in interface Navigate<Processor>
Returns:
true if more outputs

getMessageIdExpression

public Expression getMessageIdExpression()

getIdempotentRepository

public IdempotentRepository<String> getIdempotentRepository()

getProcessor

public Processor getProcessor()

doStart

protected void doStart()
                throws Exception
Specified by:
doStart in class ServiceSupport
Throws:
Exception

doStop

protected void doStop()
               throws Exception
Specified by:
doStop in class ServiceSupport
Throws:
Exception

onDuplicateMessage

protected void onDuplicateMessage(Exchange exchange,
                                  String messageId)
A strategy method to allow derived classes to overload the behaviour of processing a duplicate message

Parameters:
exchange - the exchange
messageId - the message ID of this exchange


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