/*
* 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.runtime.core.routing;
import org.mule.runtime.api.message.Message;
import org.mule.runtime.core.api.Event;
import org.mule.runtime.core.api.MuleContext;
import org.mule.runtime.core.api.serialization.SerializationException;
import org.mule.runtime.api.store.ObjectStoreException;
import org.mule.runtime.core.routing.correlation.CollectionCorrelatorCallback;
import org.mule.runtime.core.routing.correlation.CorrelationSequenceComparator;
import org.mule.runtime.core.routing.correlation.EventCorrelatorCallback;
import java.util.Arrays;
import java.util.Comparator;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.ByteArrayOutputStream;
public class MessageChunkAggregator extends AbstractAggregator {
public static final int DEFAULT_BUFFER_SIZE = 4096;
protected Comparator eventComparator;
public MessageChunkAggregator() {
super();
eventComparator = new CorrelationSequenceComparator();
}
@Override
protected EventCorrelatorCallback getCorrelatorCallback(MuleContext muleContext) {
return new CollectionCorrelatorCallback(muleContext, storePrefix) {
/**
* This method is invoked if the shouldAggregate method is called and returns true. Once this method returns an aggregated
* message the event group is removed from the router
*
* @param events the event group for this request
* @return an aggregated message
* @throws org.mule.runtime.core.routing.AggregationException if the aggregation fails. in this scenario the whole event
* group is removed and passed to the exception handler for this componenet
*/
@Override
public Event aggregateEvents(EventGroup events) throws AggregationException {
Event[] collectedEvents;
try {
collectedEvents = events.toArray(false);
} catch (ObjectStoreException e) {
throw new AggregationException(events, MessageChunkAggregator.this, e);
}
Event firstEvent = collectedEvents[0];
Arrays.sort(collectedEvents, eventComparator);
ByteArrayOutputStream baos = new ByteArrayOutputStream(DEFAULT_BUFFER_SIZE);
try {
for (Event event : collectedEvents) {
baos.write(event.getMessageAsBytes(muleContext));
}
final Message.Builder builder = Message.builder(firstEvent.getMessage());
// try to deserialize message, since ChunkingRouter might have serialized the object...
try {
builder.payload(muleContext.getObjectSerializer().getInternalProtocol().deserialize(baos.toByteArray()));
} catch (SerializationException e) {
builder.payload(baos.toByteArray());
}
// Use last event, that hasn't been completed yet, for continued processing.
return Event.builder(collectedEvents[collectedEvents.length - 1]).message(builder.build())
.session(getMergedSession(events.toArray())).build();
} catch (Exception e) {
throw new AggregationException(events, MessageChunkAggregator.this, e);
} finally {
IOUtils.closeQuietly(baos);
}
}
};
}
}