Creating custom aggregator

Aug 31, 2016Download as PPTX, PDF0 likes244 views

This document provides instructions for creating a custom message aggregator in Mulesoft. It explains that a custom aggregator can be implemented by extending the AbstractAggregator interface and overriding its standard implementations. It includes a code snippet for a custom TestAggregator class that overrides the getCorrelatorCallback method to aggregate event payloads by appending them to a string buffer. The custom aggregator can then be added to Mule flows via the Custom Aggregator component.

Creating Custom Aggregator
- By Rahul Kumar

Custom Aggregator
Create your own Filter implementation by
Implementing import org.mule.routing.AbstractAggregator interface
Overriding the standard implementations of import org.mule.routing.AbstractAggregator like
org.mule.routing.SimpleCollectionAggregator (used in Collection Aggregator
component), org.mule.routing.MessageChunkAggregator (used in Message Chunk
Aggregator component) and many more

Snippet for Custom
Aggregator
import org.mule.DefaultMuleEvent;
import org.mule.DefaultMuleMessage;
import org.mule.api.MuleContext;
import org.mule.api.MuleEvent;
import org.mule.api.store.ObjectStoreException;
import org.mule.api.transformer.TransformerException;
import org.mule.routing.AbstractAggregator;
import org.mule.routing.AggregationException;
import org.mule.routing.EventGroup;
import org.mule.routing.correlation.CollectionCorrelatorCallback;
import org.mule.routing.correlation.EventCorrelatorCallback;
import org.mule.util.concurrent.ThreadNameHelper;
import java.util.Iterator;
public class TestAggregator extends AbstractAggregator
{

Snippet for Custom
Aggregator
@Override
protected EventCorrelatorCallback getCorrelatorCallback(MuleContext muleContext)
{
return new CollectionCorrelatorCallback(muleContext,false,storePrefix)
{
@Override
public MuleEvent aggregateEvents(EventGroup events) throws AggregationException
{
StringBuffer buffer = new StringBuffer(128);
try
{
for (Iterator<MuleEvent> iterator = events.iterator(); iterator.hasNext();)
{
MuleEvent event = iterator.next();
try
{

Snippet for Custom
Aggregator
buffer.append(event.transformMessageToString());
}
catch (TransformerException e)
{
throw new AggregationException(events, null, e);
}
}
}
catch (ObjectStoreException e)
{
throw new AggregationException(events,null,e);
}
logger.debug("event payload is: " + buffer.toString());
return new DefaultMuleEvent(new DefaultMuleMessage(buffer.toString(), muleContext), events.getMessageCollectionEvent());
}
};
}
}

Snippet for Custom
Aggregator
The snippet shown will create acustom Aggregator which will append
payload received from various Mule Events

Configuration
Provide this class in Custom Aggregator component from the palette.
Your custom Aggregator is now ready to use!

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Creating custom aggregator

1. Creating Custom Aggregator - By Rahul Kumar

2. Custom Aggregator Create your own Filter implementation by Implementing import org.mule.routing.AbstractAggregator interface Overriding the standard implementations of import org.mule.routing.AbstractAggregator like org.mule.routing.SimpleCollectionAggregator (used in Collection Aggregator component), org.mule.routing.MessageChunkAggregator (used in Message Chunk Aggregator component) and many more

3. Snippet for Custom Aggregator import org.mule.DefaultMuleEvent; import org.mule.DefaultMuleMessage; import org.mule.api.MuleContext; import org.mule.api.MuleEvent; import org.mule.api.store.ObjectStoreException; import org.mule.api.transformer.TransformerException; import org.mule.routing.AbstractAggregator; import org.mule.routing.AggregationException; import org.mule.routing.EventGroup; import org.mule.routing.correlation.CollectionCorrelatorCallback; import org.mule.routing.correlation.EventCorrelatorCallback; import org.mule.util.concurrent.ThreadNameHelper; import java.util.Iterator; public class TestAggregator extends AbstractAggregator {

4. Snippet for Custom Aggregator @Override protected EventCorrelatorCallback getCorrelatorCallback(MuleContext muleContext) { return new CollectionCorrelatorCallback(muleContext,false,storePrefix) { @Override public MuleEvent aggregateEvents(EventGroup events) throws AggregationException { StringBuffer buffer = new StringBuffer(128); try { for (Iterator<MuleEvent> iterator = events.iterator(); iterator.hasNext();) { MuleEvent event = iterator.next(); try {

5. Snippet for Custom Aggregator buffer.append(event.transformMessageToString()); } catch (TransformerException e) { throw new AggregationException(events, null, e); } } } catch (ObjectStoreException e) { throw new AggregationException(events,null,e); } logger.debug("event payload is: " + buffer.toString()); return new DefaultMuleEvent(new DefaultMuleMessage(buffer.toString(), muleContext), events.getMessageCollectionEvent()); } }; } }

6. Snippet for Custom Aggregator The snippet shown will create acustom Aggregator which will append payload received from various Mule Events

7. Configuration Provide this class in Custom Aggregator component from the palette. Your custom Aggregator is now ready to use!

8. Thank You

Creating custom aggregator

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