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Wiki Markup
{snippet:id=example|lang=java|url=activemq/camel/trunk/camel-core/src/test/java/org/apache/camel/processor/LoadBalanceTest.java}

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Code Block
languagexml
<bean id = "roundRobinRef" class="org.apache.camel.processor.loadbalancer.RoundRobinLoadBalancer" />
  <camelContext id="camel" xmlns="http://activemqcamel.apache.org/camel/schema/spring">
    <route>
      <from uri="direct:start"/>
      <loadBalance ref="roundRobinRef">
          <to uri="mock:x"/>        
          <to uri="mock:y"/>       
          <to uri="mock:z"/>          
      </loadBalance>
    </route>
  </camelContext>

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Code Block
languagexml
<camelContext id="camel" xmlns="http://activemqcamel.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <loadBalance>        
        <roundRobin/>  <!-- This only support for Camel 1.5 -->
        <to uri="mock:x"/>        
        <to uri="mock:y"/>       
        <to uri="mock:z"/>                 
    </loadBalance>
  </route>
</camelContext>

So the above example will load balance requests from direct:start to one of the available mock endpoint instances, in this case using a round robbin policy.
For further examples of this pattern in use you could look at the junit test case

Build in load balancing policies

Camel has out of the box the following policies:

Policy

Description

Round Robin

The exchanges is selected in a round robin fashion. This is a well known and classic policy. This spreads the load even.

Random

A random endpoint is selected for each exchange

Sticky

Sticky load balancing using an Expression to calculate a correlation key to perform the sticky load balancing; rather like jsessionid in the web or JMSXGroupID in JMS.

Topic

Topic which sends to all destinations (rather like JMS Topics)

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