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.CamelContext;
023 import org.apache.camel.Component;
024 import org.apache.camel.Consumer;
025 import org.apache.camel.Exchange;
026 import org.apache.camel.Processor;
027 import org.apache.camel.Producer;
028 import org.apache.camel.Service;
029 import org.apache.camel.impl.DefaultEndpoint;
030 import org.apache.camel.impl.DefaultProducer;
031 import org.apache.camel.processor.loadbalancer.LoadBalancer;
032 import org.apache.camel.processor.loadbalancer.LoadBalancerConsumer;
033 import org.apache.camel.processor.loadbalancer.TopicLoadBalancer;
034 import org.apache.camel.spi.BrowsableEndpoint;
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 $Revision: 820620 $
041 */
042 public class BrowseEndpoint extends DefaultEndpoint implements BrowsableEndpoint, Service {
043 private List<Exchange> exchanges;
044 private final LoadBalancer loadBalancer = new TopicLoadBalancer();
045
046 public BrowseEndpoint() {
047 }
048
049 public BrowseEndpoint(String uri, CamelContext camelContext) {
050 super(uri, camelContext);
051 }
052
053 public BrowseEndpoint(String uri, Component component) {
054 super(uri, component);
055 }
056
057 public BrowseEndpoint(String endpointUri) {
058 super(endpointUri);
059 }
060
061 public boolean isSingleton() {
062 return true;
063 }
064
065 public List<Exchange> getExchanges() {
066 if (exchanges == null) {
067 exchanges = createExchangeList();
068 }
069 return exchanges;
070 }
071
072 public Producer createProducer() throws Exception {
073 return new DefaultProducer(this) {
074 public void process(Exchange exchange) throws Exception {
075 onExchange(exchange);
076 }
077 };
078 }
079
080 public Consumer createConsumer(Processor processor) throws Exception {
081 return new LoadBalancerConsumer(this, processor, loadBalancer);
082 }
083
084 protected List<Exchange> createExchangeList() {
085 return new CopyOnWriteArrayList<Exchange>();
086 }
087
088 /**
089 * Invoked on a message exchange being sent by a producer
090 *
091 * @param exchange the exchange
092 * @throws Exception is thrown if failed to process the exchange
093 */
094 protected void onExchange(Exchange exchange) throws Exception {
095 getExchanges().add(exchange);
096
097 // lets fire any consumers
098 loadBalancer.process(exchange);
099 }
100
101 public void start() throws Exception {
102 exchanges = createExchangeList();
103 }
104
105 public void stop() throws Exception {
106 if (exchanges != null) {
107 exchanges.clear();
108 exchanges = null;
109 }
110 }
111 }