001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.processor.loadbalancer; 018 019 import java.util.ArrayList; 020 import java.util.List; 021 import java.util.concurrent.CopyOnWriteArrayList; 022 023 import org.apache.camel.Navigate; 024 import org.apache.camel.Processor; 025 import org.apache.camel.impl.ServiceSupport; 026 import org.apache.camel.util.ServiceHelper; 027 028 /** 029 * A default base class for a {@link LoadBalancer} implementation 030 * 031 * @version $Revision: 769303 $ 032 */ 033 public abstract class LoadBalancerSupport extends ServiceSupport implements LoadBalancer, Navigate<Processor> { 034 035 private final List<Processor> processors = new CopyOnWriteArrayList<Processor>(); 036 037 public void addProcessor(Processor processor) { 038 processors.add(processor); 039 } 040 041 public void removeProcessor(Processor processor) { 042 processors.remove(processor); 043 } 044 045 public List<Processor> getProcessors() { 046 return processors; 047 } 048 049 public List<Processor> next() { 050 if (!hasNext()) { 051 return null; 052 } 053 return new ArrayList<Processor>(processors); 054 } 055 056 public boolean hasNext() { 057 return processors.size() > 0; 058 } 059 060 protected void doStart() throws Exception { 061 ServiceHelper.startServices(processors); 062 } 063 064 protected void doStop() throws Exception { 065 ServiceHelper.stopServices(processors); 066 } 067 }