org.apache.camel.processor.loadbalancer
Class QueueLoadBalancer

java.lang.Object
  org.apache.camel.support.ServiceSupport
      org.apache.camel.processor.loadbalancer.LoadBalancerSupport
          org.apache.camel.processor.loadbalancer.QueueLoadBalancer

All Implemented Interfaces:

AsyncProcessor, Navigate<Processor>, Processor, LoadBalancer, Service, ShutdownableService, StatefulService, SuspendableService

Direct Known Subclasses:

RandomLoadBalancer, RoundRobinLoadBalancer, StickyLoadBalancer, WeightedLoadBalancer

public abstract class QueueLoadBalancer
extends LoadBalancerSupport

A base class for LoadBalancer implementations which choose a single destination for each exchange (rather like JMS Queues)

Version:

Field Summary

Fields inherited from class org.apache.camel.processor.loadbalancer.LoadBalancerSupport

log

Fields inherited from class org.apache.camel.support.ServiceSupport

shutdown, shuttingdown, started, starting, stopped, stopping, suspended, suspending

Constructor Summary

QueueLoadBalancer()

Method Summary

protected abstract Processor	chooseProcessor(List<Processor> processors, Exchange exchange)
void	process(Exchange exchange) Processes the message exchange
boolean	process(Exchange exchange, AsyncCallback callback) Processes the message exchange.

Methods inherited from class org.apache.camel.processor.loadbalancer.LoadBalancerSupport

addProcessor, doStart, doStop, getProcessors, hasNext, next, removeProcessor

Methods inherited from class org.apache.camel.support.ServiceSupport

doResume, doShutdown, doSuspend, getStatus, getVersion, isRunAllowed, isStarted, isStarting, isStopped, isStopping, isSuspended, isSuspending, resume, shutdown, start, stop, suspend

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueueLoadBalancer

public QueueLoadBalancer()

Method Detail

process

public boolean process(Exchange exchange,
                       AsyncCallback callback)

Description copied from interface: AsyncProcessor

Processes the message exchange. Similar to Processor.process(org.apache.camel.Exchange), but the caller supports having the exchange asynchronously processed.

If there was a failure processing then the caused Exception would be set on the Exchange.

Parameters:

exchange - the message exchange

callback - the AsyncCallback will be invoked when the processing of the exchange is completed. If the exchange is completed synchronously, then the callback is also invoked synchronously. The callback should therefore be careful of starting recursive loop.

Returns:

(doneSync) true to continue execute synchronously, false to continue being executed asynchronously

See Also:

AsyncProcessorHelper.process(AsyncProcessor, Exchange, AsyncCallback)

process

public void process(Exchange exchange)
             throws Exception

Description copied from interface: Processor

Processes the message exchange

Specified by:

process in interface Processor

Overrides:

process in class LoadBalancerSupport

Parameters:

exchange - the message exchange

Throws:

Exception - if an internal processing error has occurred.

chooseProcessor

protected abstract Processor chooseProcessor(List<Processor> processors,
                                             Exchange exchange)