/**
 * 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 org.apache.camel.processor.loadbalancer;

import java.util.List;

import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;

/**
 * A {@link LoadBalancer} implementations which sends to all destinations
 * (rather like JMS Topics). 
 * 
 * @version $Revision: 2375 $
 *
 */
public class TopicLoadBalancer extends LoadBalancerSupport {

    public void process(Exchange exchange) throws Exception {
        List<Processor> list = getProcessors();
        for (Processor processor : list) {
            Exchange copy = copyExchangeStrategy(processor, exchange);
            processor.process(copy);
        }
    }

    /**
     * Strategy method to copy the exchange before sending to another endpoint.
     * Derived classes such as the {@link org.apache.camel.processor.Pipeline Pipeline}
     * will not clone the exchange
     * 
     * @param processor the processor that will send the exchange
     * @param exchange  the exchange
     * @return the current exchange if no copying is required such as for a
     *         pipeline otherwise a new copy of the exchange is returned.
     */
    protected Exchange copyExchangeStrategy(Processor processor, Exchange exchange) {
        return exchange.copy();
    }

    public boolean process(Exchange exchange, AsyncCallback callback) {
        List<Processor> list = getProcessors();
        for (Processor processor : list) {
            Exchange copy = copyExchangeStrategy(processor, exchange);
            try {
                processor.process(copy);
            } catch (Exception ex) {
                // We don't handle the exception here
            }
        }
        callback.done(false);
        return false;
    }
}
