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.beans.PropertyChangeListener;
020 import java.beans.PropertyChangeSupport;
021 import java.util.List;
022 import java.util.concurrent.CopyOnWriteArrayList;
023
024 import org.apache.camel.CamelContext;
025 import org.apache.camel.Component;
026 import org.apache.camel.Consumer;
027 import org.apache.camel.Exchange;
028 import org.apache.camel.Processor;
029 import org.apache.camel.Producer;
030 import org.apache.camel.Service;
031 import org.apache.camel.impl.DefaultEndpoint;
032 import org.apache.camel.impl.DefaultProducer;
033 import org.apache.camel.processor.loadbalancer.LoadBalancerConsumer;
034 import org.apache.camel.processor.loadbalancer.TopicLoadBalancer;
035 import org.apache.camel.spi.BrowsableEndpoint;
036
037 /**
038 * An endpoint which maintains a {@link List} of {@link Exchange} instances
039 * which can be useful for tooling, debugging and visualising routes.
040 *
041 * @version $Revision: 736555 $
042 */
043 public class BrowseEndpoint extends DefaultEndpoint implements BrowsableEndpoint, Service {
044 private List<Exchange> exchanges;
045 private TopicLoadBalancer loadBalancer = new TopicLoadBalancer();
046 // TODO: firing of property changes not implemented
047 private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
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 return exchanges;
067 }
068
069 public TopicLoadBalancer getLoadBalancer() {
070 return loadBalancer;
071 }
072
073 public void addPropertyChangeListener(PropertyChangeListener listener) {
074 propertyChangeSupport.addPropertyChangeListener(listener);
075 }
076
077 public void removePropertyChangeListener(PropertyChangeListener listener) {
078 propertyChangeSupport.removePropertyChangeListener(listener);
079 }
080
081 public Producer createProducer() throws Exception {
082 return new DefaultProducer(this) {
083 public void process(Exchange exchange) throws Exception {
084 onExchange(exchange);
085 }
086 };
087 }
088
089 public Consumer createConsumer(Processor processor) throws Exception {
090 return new LoadBalancerConsumer(this, processor, loadBalancer);
091 }
092
093 protected List<Exchange> createExchangeList() {
094 return new CopyOnWriteArrayList<Exchange>();
095 }
096
097 /**
098 * Invoked on a message exchange being sent by a producer
099 *
100 * @param exchange the exchange
101 * @throws Exception is thrown if failed to process the exchange
102 */
103 protected void onExchange(Exchange exchange) throws Exception {
104 exchanges.add(exchange);
105
106 // lets fire any consumers
107 loadBalancer.process(exchange);
108 }
109
110 public void start() throws Exception {
111 exchanges = createExchangeList();
112 }
113
114 public void stop() throws Exception {
115 if (exchanges != null) {
116 exchanges.clear();
117 exchanges = null;
118 }
119 }
120 }