org.apache.camel.processor.idempotent
Class IdempotentConsumer

java.lang.Object
  org.apache.camel.impl.ServiceSupport
      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, boolean skipDuplicate, 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,
                          boolean skipDuplicate,
                          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