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.component.browse;
018
019 import java.util.List;
020 import java.util.concurrent.CopyOnWriteArrayList;
021
022 import org.apache.camel.Component;
023 import org.apache.camel.Consumer;
024 import org.apache.camel.Exchange;
025 import org.apache.camel.Processor;
026 import org.apache.camel.Producer;
027 import org.apache.camel.Service;
028 import org.apache.camel.impl.DefaultEndpoint;
029 import org.apache.camel.impl.DefaultProducer;
030 import org.apache.camel.processor.loadbalancer.LoadBalancer;
031 import org.apache.camel.processor.loadbalancer.LoadBalancerConsumer;
032 import org.apache.camel.processor.loadbalancer.TopicLoadBalancer;
033 import org.apache.camel.spi.BrowsableEndpoint;
034 import org.apache.camel.spi.UriEndpoint;
035
036 /**
037 * An endpoint which maintains a {@link List} of {@link Exchange} instances
038 * which can be useful for tooling, debugging and visualising routes.
039 *
040 * @version
041 */
042 @UriEndpoint(scheme = "browse")
043 public class BrowseEndpoint extends DefaultEndpoint implements BrowsableEndpoint {
044 private List<Exchange> exchanges;
045 private final LoadBalancer loadBalancer = new TopicLoadBalancer();
046
047 public BrowseEndpoint() {
048 }
049
050 public BrowseEndpoint(String uri, Component component) {
051 super(uri, component);
052 }
053
054 public boolean isSingleton() {
055 return true;
056 }
057
058 public List<Exchange> getExchanges() {
059 if (exchanges == null) {
060 exchanges = createExchangeList();
061 }
062 return exchanges;
063 }
064
065 public Producer createProducer() throws Exception {
066 return new DefaultProducer(this) {
067 public void process(Exchange exchange) throws Exception {
068 onExchange(exchange);
069 }
070 };
071 }
072
073 public Consumer createConsumer(Processor processor) throws Exception {
074 Consumer answer = new LoadBalancerConsumer(this, processor, loadBalancer);
075 configureConsumer(answer);
076 return answer;
077 }
078
079 protected List<Exchange> createExchangeList() {
080 return new CopyOnWriteArrayList<Exchange>();
081 }
082
083 /**
084 * Invoked on a message exchange being sent by a producer
085 *
086 * @param exchange the exchange
087 * @throws Exception is thrown if failed to process the exchange
088 */
089 protected void onExchange(Exchange exchange) throws Exception {
090 getExchanges().add(exchange);
091
092 // now fire any consumers
093 loadBalancer.process(exchange);
094 }
095
096 @Override
097 protected void doStart() throws Exception {
098 exchanges = createExchangeList();
099 super.doStart();
100 }
101
102 @Override
103 protected void doStop() throws Exception {
104 if (exchanges != null) {
105 exchanges.clear();
106 exchanges = null;
107 }
108 super.doStop();
109 }
110 }