Use a broker camel component to re-route messages when the queue size reaches a limit

message-router-camel-broker

 <camelContext id="camel" trace="false" xmlns="http://camel.apache.org/schema/spring">
    <route id="routeAboveQueueLimitTest">
        <from uri="broker:queue:test.broker.queue"/>
        <choice>
            <when>
                <spel>#{@destinationView.queueSize >= 100}</spel>
                <to uri="broker:queue:test.broker.processLater"/>
            </when>
            <otherwise>
                <to uri="broker:queue:test.broker.queue"/>
            </otherwise>
        </choice>
        </route>

    </camelContext>
    <bean id="brokerView" class="org.apache.activemq.broker.view.MessageBrokerView">
        <constructor-arg value="testBroker"/>
    </bean>
    <bean id="destinationView" factory-bean="brokerView" factory-method="getDestinationView">
        <constructor-arg value="test.broker.component.route"/>
    </bean>