/*
* $Id: Resequencer.java 20813 2010-12-21 11:37:48Z dirk.olmes $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.routing;
import org.mule.api.MuleContext;
import org.mule.api.MuleEvent;
import org.mule.api.MuleException;
import org.mule.api.lifecycle.InitialisationException;
import org.mule.config.i18n.CoreMessages;
import org.mule.routing.correlation.CorrelationSequenceComparator;
import org.mule.routing.correlation.EventCorrelatorCallback;
import org.mule.routing.correlation.ResequenceMessagesCorrelatorCallback;
import java.util.Comparator;
/**
* <code>Resequencer</code> is used to resequence events according to their dispatch
* sequence in the correlation group. When the message splitter router splits an
* event it assigns a correlation sequence to the individual message parts so that
* another router such as the <i>Resequencer</i> can receive the parts and reorder or
* merge them.
* <p>
* <b>EIP Reference:</b> <a href="http://www.eaipatterns.com/Resequencer.html">http://www.eaipatterns.com/Resequencer.html<a/>
*/
public class Resequencer extends AbstractAggregator
{
protected Comparator eventComparator;
public Resequencer()
{
super();
this.setEventComparator(new CorrelationSequenceComparator());
}
@Override
public void initialise() throws InitialisationException
{
if (eventComparator == null)
{
throw new InitialisationException(CoreMessages.objectIsNull("eventComparator"), this);
}
super.initialise();
}
public Comparator getEventComparator()
{
return eventComparator;
}
public void setEventComparator(Comparator eventComparator)
{
this.eventComparator = eventComparator;
}
@Override
protected EventCorrelatorCallback getCorrelatorCallback(MuleContext muleContext)
{
return new ResequenceMessagesCorrelatorCallback(getEventComparator(), muleContext);
}
@Override
public MuleEvent process(MuleEvent event) throws MuleException
{
MuleEvent result = eventCorrelator.process(event);
if (result == null)
{
return null;
}
MuleEvent last = null;
for (MuleEvent muleEvent : (MuleEvent[]) result.getMessage().getPayload())
{
last = processNext(muleEvent);
}
// Respect existing behaviour by returning last event
return last;
}
}