Creating custom aggregation strategy
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This document discusses creating a custom aggregation strategy for the Scatter-Gather routing component in Mule. It describes implementing the AggregationStrategy interface and overriding the default CollectAllAggregationStrategy. The snippet provided shows an example aggregation strategy class that collects successful responses even if errors occur, logging any exceptions. To use it, the custom strategy class would be provided in the Scatter-Gather component configuration.
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Creating custom aggregation strategy
- 1. Creating Custom Aggregation Strategy for Scatter-Gather - By Rahul Kumar
- 2. Creating Custom Aggregation Strategy Create your own Aggregation Strategy by Implementing org.mule.routing.AggregationStrategy interface Overriding the standard implementations of org.mule.routing.AggregationStrategy like org.mule.routing.CollectAllAggregationStrategy (used by default in Scatter-Gather
- 3. Snippet for Custom Aggregator package org.rahul.mule.scattergather; import java.util.List; import java.util.Map; import org.apache.log4j.Logger; import org.mule.api.MuleContext; import org.mule.api.MuleEvent; import org.mule.api.MuleException; import org.mule.api.context.MuleContextAware; import org.mule.api.routing.AggregationContext; import org.mule.api.routing.RouterResultsHandler; import org.mule.routing.AggregationStrategy; import org.mule.routing.DefaultRouterResultsHandler; public class ProcessCollectedAggregationStrategy implements AggregationStrategy, MuleContextAware { private static final Logger logger = Logger.getLogger(ProcessCollectedAggregationStrategy.class);
- 4. Snippet for Custom Aggregator private RouterResultsHandler resultsHandler = new DefaultRouterResultsHandler(); private MuleContext muleContext; @Override public MuleEvent aggregate(AggregationContext context) throws MuleException { List<MuleEvent> eventsWithExceptions = context.collectEventsWithExceptions(); List<MuleEvent> eventsWithoutExceptions = context.collectEventsWithoutExceptions(); if (!eventsWithExceptions.isEmpty()) { logger.warn(String.format("Found %d exceptions in total. Continuing with whatever has been collected so far.", eventsWithExceptions.size()));
- 5. Snippet for Custom Aggregator logger.debug("Logging exceptions for individual paths. Route indexes are zero-based."); for (Map.Entry<Integer, Throwable> routeException : context.collectRouteExceptions().entrySet()) { logger.debug(String.format("An exception was found for route %d: ", routeException.getKey()), routeException.getValue()); } } return resultsHandler.aggregateResults(eventsWithoutExceptions, context.getOriginalEvent(), muleContext); } @Override public void setMuleContext(MuleContext context) { this.muleContext = context; } }
- 6. Snippet for Custom Aggregator The snippet shown will create a custom Aggregation Strategy for Scatter Gather component By default if error occurs in any of parallel branch of Scatter-Gather the error will be throw. The aggregation strategy shown in the snippet will make it lenient. Thus all the branches which didn’t throw errors , their responses will be collected.
- 7. Configuration Provide this class in the Scatter Gather component from the palette.
- 8. Thank You