| /** |
| * 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.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Navigate; |
| import org.apache.camel.Processor; |
| import org.apache.camel.impl.ServiceSupport; |
| import org.apache.camel.util.AsyncProcessorHelper; |
| import org.apache.camel.util.ServiceHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A default base class for a {@link LoadBalancer} implementation. |
| * <p/> |
| * This implementation is dedicated for asynchronous load balancers. |
| * <p/> |
| * Consider using the {@link SimpleLoadBalancerSupport} if your load balancer does not by nature |
| * support asynchronous routing. |
| * |
| * @version |
| */ |
| public abstract class LoadBalancerSupport extends ServiceSupport implements LoadBalancer, Navigate<Processor> { |
| |
| protected final Logger log = LoggerFactory.getLogger(getClass()); |
| private final List<Processor> processors = new CopyOnWriteArrayList<Processor>(); |
| |
| public void addProcessor(Processor processor) { |
| processors.add(processor); |
| } |
| |
| public void removeProcessor(Processor processor) { |
| processors.remove(processor); |
| } |
| |
| public List<Processor> getProcessors() { |
| return processors; |
| } |
| |
| public List<Processor> next() { |
| if (!hasNext()) { |
| return null; |
| } |
| return new ArrayList<Processor>(processors); |
| } |
| |
| public boolean hasNext() { |
| return processors.size() > 0; |
| } |
| |
| protected void doStart() throws Exception { |
| ServiceHelper.startServices(processors); |
| } |
| |
| protected void doStop() throws Exception { |
| ServiceHelper.stopServices(processors); |
| for (Processor processor : processors) { |
| removeProcessor(processor); |
| } |
| } |
| |
| public void process(Exchange exchange) throws Exception { |
| AsyncProcessorHelper.process(this, exchange); |
| } |
| } |