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 }