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/*
* $Id: RoundRobinXmlSplitter.java 11567 2008-04-11 13:08:05Z dirk.olmes $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSource, Inc. All rights reserved. http://www.mulesource.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.module.xml.routing;
import org.mule.DefaultMuleMessage;
import org.mule.api.MuleException;
import org.mule.api.MuleMessage;
import org.mule.api.MuleSession;
import org.mule.api.endpoint.OutboundEndpoint;
import org.mule.api.routing.CouldNotRouteOutboundMessageException;
import org.mule.api.routing.RoutingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import org.dom4j.Document;
/**
* This router will split the Xml message into parts based on the xpath expression
* and route each new event to the endpoints on the router, one after the other.
*/
public class RoundRobinXmlSplitter extends FilteringXmlMessageSplitter
{
// We have to do some additional checks if we're going to allow filters on the
// round robin endpoints
// So for performance lets turn it off by default
protected volatile boolean enableEndpointFiltering = false;
private boolean deterministic = true;
private static final AtomicInteger globalCounter = new AtomicInteger(0);
public MuleMessage route(MuleMessage message, MuleSession session, boolean synchronous)
throws RoutingException
{
try
{
String correlationId = messageInfoMapping.getCorrelationId(message);
initialise(message);
OutboundEndpoint endpoint;
MuleMessage result = null;
Document part;
List parts = (List)nodesContext.get();
if (parts == null)
{
logger.error("There are no parts for current message. No events were routed: " + message);
return null;
}
int correlationSequence = 1;
Counter epCounter = new Counter();
Iterator iterator = parts.iterator();
while (iterator.hasNext())
{
part = (Document)iterator.next();
// Create the message
Map theProperties = (Map)propertiesContext.get();
message = new DefaultMuleMessage(part, new HashMap(theProperties));
if (enableEndpointFiltering)
{
endpoint = getEndpointForMessage(message);
}
else
{
endpoint = (OutboundEndpoint) getEndpoints().get(epCounter.next());
}
if (endpoint == null)
{
logger.error("There was no matching endpoint for message part: " + part.asXML());
}
else
{
try
{
if (enableCorrelation != ENABLE_CORRELATION_NEVER)
{
boolean correlationSet = message.getCorrelationId() != null;
if (!correlationSet && (enableCorrelation == ENABLE_CORRELATION_IF_NOT_SET))
{
message.setCorrelationId(correlationId);
}
// take correlation group size from the message
// properties, set by concrete message splitter
// implementations
final int groupSize = message.getCorrelationGroupSize();
message.setCorrelationGroupSize(groupSize);
message.setCorrelationSequence(correlationSequence++);
}
if (synchronous)
{
result = send(session, message, endpoint);
}
else
{
dispatch(session, message, endpoint);
}
}
catch (MuleException e)
{
throw new CouldNotRouteOutboundMessageException(message, endpoint, e);
}
}
}
return result;
}
finally
{
this.cleanup();
}
}
/**
* Retrieves a specific message part for the given endpoint. the message will
* then be routed via the provider.
*
* @param message the current message being processed
* @return the message part to dispatch
*/
protected OutboundEndpoint getEndpointForMessage(MuleMessage message)
{
for (int i = 0; i < endpoints.size(); i++)
{
OutboundEndpoint endpoint = (OutboundEndpoint)endpoints.get(i);
try
{
if (endpoint.getFilter() == null || endpoint.getFilter().accept(message))
{
if (logger.isDebugEnabled())
{
logger.debug("Endpoint filter matched for node " + i + ". Routing message over: "
+ endpoint.getEndpointURI().toString());
}
return endpoint;
}
else
{
if (logger.isDebugEnabled())
{
logger.debug("Endpoint filter did not match");
}
}
}
catch (Exception e)
{
logger.error("Unable to create message for node at position " + i, e);
return null;
}
}
return null;
}
public void addEndpoint(OutboundEndpoint endpoint)
{
if (endpoint.getFilter() != null && !enableEndpointFiltering)
{
throw new IllegalStateException(
"Endpoints on the RoundRobin splitter router cannot have filters associated with them");
}
super.addEndpoint(endpoint);
}
public boolean isEnableEndpointFiltering()
{
return enableEndpointFiltering;
}
public void setEnableEndpointFiltering(boolean enableEndpointFiltering)
{
this.enableEndpointFiltering = enableEndpointFiltering;
}
public boolean isDeterministic()
{
return deterministic;
}
public void setDeterministic(boolean deterministic)
{
this.deterministic = deterministic;
}
private class Counter
{
private AtomicInteger counter;
public Counter()
{
if (isDeterministic())
{
counter = new AtomicInteger(0);
}
else
{
counter = globalCounter;
}
}
public int next()
{
return counter.getAndIncrement() % getEndpoints().size();
}
}
}
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