MyCustomLoadBalancer.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package camelinaction;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.processor.loadbalancer.SimpleLoadBalancerSupport;

/**
 * A custom load balancer which will pick the first processor for gold messages,
 * and the 2nd processor for other kind of messages.
 * <p/>
 * Notice we extend the {@link SimpleLoadBalancerSupport} which provides
 * all the proper start and stop logic.
 *
 * @version $Revision$
 */
public class MyCustomLoadBalancer extends SimpleLoadBalancerSupport {

    public void process(Exchange exchange) throws Exception {
        Processor target = chooseProcessor(exchange);
        target.process(exchange);
    }

    protected Processor chooseProcessor(Exchange exchange) {
        String type = exchange.getIn().getHeader("type", String.class);
        if ("gold".equals(type)) {
            return getProcessors().get(0);
        } else {
            return getProcessors().get(1);
        }
    }
    
}