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.activemq.network;
018
019 import java.io.IOException;
020 import java.net.URI;
021 import java.net.URISyntaxException;
022 import java.util.HashMap;
023 import java.util.Iterator;
024 import java.util.Map;
025
026 import org.apache.activemq.broker.BrokerService;
027 import org.apache.activemq.broker.SslContext;
028 import org.apache.activemq.command.DiscoveryEvent;
029 import org.apache.activemq.transport.Transport;
030 import org.apache.activemq.transport.TransportDisposedIOException;
031 import org.apache.activemq.transport.TransportFactory;
032 import org.apache.activemq.transport.discovery.DiscoveryAgent;
033 import org.apache.activemq.transport.discovery.DiscoveryAgentFactory;
034 import org.apache.activemq.transport.discovery.DiscoveryListener;
035 import org.apache.activemq.util.IntrospectionSupport;
036 import org.apache.activemq.util.ServiceStopper;
037 import org.apache.activemq.util.ServiceSupport;
038 import org.apache.activemq.util.URISupport;
039 import org.apache.activemq.util.URISupport.CompositeData;
040 import org.slf4j.Logger;
041 import org.slf4j.LoggerFactory;
042
043 import javax.management.ObjectName;
044
045 /**
046 * A network connector which uses a discovery agent to detect the remote brokers
047 * available and setup a connection to each available remote broker
048 *
049 * @org.apache.xbean.XBean element="networkConnector"
050 *
051 */
052 public class DiscoveryNetworkConnector extends NetworkConnector implements DiscoveryListener {
053 private static final Logger LOG = LoggerFactory.getLogger(DiscoveryNetworkConnector.class);
054
055 private DiscoveryAgent discoveryAgent;
056
057 private Map<String, String> parameters;
058
059 public DiscoveryNetworkConnector() {
060 }
061
062 public DiscoveryNetworkConnector(URI discoveryURI) throws IOException {
063 setUri(discoveryURI);
064 }
065
066 public void setUri(URI discoveryURI) throws IOException {
067 setDiscoveryAgent(DiscoveryAgentFactory.createDiscoveryAgent(discoveryURI));
068 try {
069 parameters = URISupport.parseParameters(discoveryURI);
070 // allow discovery agent to grab it's parameters
071 IntrospectionSupport.setProperties(getDiscoveryAgent(), parameters);
072 } catch (URISyntaxException e) {
073 LOG.warn("failed to parse query parameters from discoveryURI: " + discoveryURI, e);
074 }
075
076 }
077
078 public void onServiceAdd(DiscoveryEvent event) {
079 // Ignore events once we start stopping.
080 if (serviceSupport.isStopped() || serviceSupport.isStopping()) {
081 return;
082 }
083 String url = event.getServiceName();
084 if (url != null) {
085 URI uri;
086 try {
087 uri = new URI(url);
088 } catch (URISyntaxException e) {
089 LOG.warn("Could not connect to remote URI: " + url + " due to bad URI syntax: " + e, e);
090 return;
091 }
092 // Should we try to connect to that URI?
093 synchronized (bridges) {
094 if( bridges.containsKey(uri) ) {
095 LOG.debug("Discovery agent generated a duplicate onServiceAdd event for: "+uri );
096 return;
097 }
098 }
099 if (localURI.equals(uri)) {
100 LOG.debug("not connecting loopback: " + uri);
101 return;
102 }
103
104 if (connectionFilter != null && !connectionFilter.connectTo(uri)) {
105 LOG.debug("connectionFilter disallows connection to: " + uri);
106 return;
107 }
108
109 URI connectUri = uri;
110 try {
111 connectUri = URISupport.applyParameters(connectUri, parameters, DISCOVERED_OPTION_PREFIX);
112 } catch (URISyntaxException e) {
113 LOG.warn("could not apply query parameters: " + parameters + " to: " + connectUri, e);
114 }
115 LOG.info("Establishing network connection from " + localURI + " to " + connectUri);
116
117 Transport remoteTransport;
118 Transport localTransport;
119 try {
120 // Allows the transport to access the broker's ssl configuration.
121 SslContext.setCurrentSslContext(getBrokerService().getSslContext());
122 try {
123 remoteTransport = TransportFactory.connect(connectUri);
124 } catch (Exception e) {
125 LOG.warn("Could not connect to remote URI: " + connectUri + ": " + e.getMessage());
126 LOG.debug("Connection failure exception: " + e, e);
127 return;
128 }
129 try {
130 localTransport = createLocalTransport();
131 } catch (Exception e) {
132 ServiceSupport.dispose(remoteTransport);
133 LOG.warn("Could not connect to local URI: " + localURI + ": " + e.getMessage());
134 LOG.debug("Connection failure exception: " + e, e);
135 return;
136 }
137 } finally {
138 SslContext.setCurrentSslContext(null);
139 }
140 NetworkBridge bridge = createBridge(localTransport, remoteTransport, event);
141 try {
142 bridge.start();
143 synchronized (bridges) {
144 bridges.put(uri, bridge);
145 }
146 } catch (Exception e) {
147 ServiceSupport.dispose(localTransport);
148 ServiceSupport.dispose(remoteTransport);
149 LOG.warn("Could not start network bridge between: " + localURI + " and: " + uri + " due to: " + e);
150 LOG.debug("Start failure exception: " + e, e);
151 try {
152 discoveryAgent.serviceFailed(event);
153 } catch (IOException e1) {
154 LOG.debug("Discovery agent failure while handling failure event: " + e1.getMessage(), e1);
155 }
156 }
157 }
158 }
159
160 public void onServiceRemove(DiscoveryEvent event) {
161 String url = event.getServiceName();
162 if (url != null) {
163 URI uri;
164 try {
165 uri = new URI(url);
166 } catch (URISyntaxException e) {
167 LOG.warn("Could not connect to remote URI: " + url + " due to bad URI syntax: " + e, e);
168 return;
169 }
170
171 NetworkBridge bridge;
172 synchronized (bridges) {
173 bridge = bridges.remove(uri);
174 }
175 }
176 }
177
178 public DiscoveryAgent getDiscoveryAgent() {
179 return discoveryAgent;
180 }
181
182 public void setDiscoveryAgent(DiscoveryAgent discoveryAgent) {
183 this.discoveryAgent = discoveryAgent;
184 if (discoveryAgent != null) {
185 this.discoveryAgent.setDiscoveryListener(this);
186 }
187 }
188
189 protected void handleStart() throws Exception {
190 if (discoveryAgent == null) {
191 throw new IllegalStateException("You must configure the 'discoveryAgent' property");
192 }
193 this.discoveryAgent.start();
194 super.handleStart();
195 }
196
197 protected void handleStop(ServiceStopper stopper) throws Exception {
198 for (Iterator<NetworkBridge> i = bridges.values().iterator(); i.hasNext();) {
199 NetworkBridge bridge = i.next();
200 try {
201 bridge.stop();
202 } catch (Exception e) {
203 stopper.onException(this, e);
204 }
205 }
206 bridges.clear();
207 try {
208 this.discoveryAgent.stop();
209 } catch (Exception e) {
210 stopper.onException(this, e);
211 }
212
213 super.handleStop(stopper);
214 }
215
216 protected NetworkBridge createBridge(Transport localTransport, Transport remoteTransport, final DiscoveryEvent event) {
217 class DiscoverNetworkBridgeListener extends MBeanNetworkListener {
218
219 public DiscoverNetworkBridgeListener(BrokerService brokerService, ObjectName connectorName) {
220 super(brokerService, connectorName);
221 }
222
223 public void bridgeFailed() {
224 if (!serviceSupport.isStopped()) {
225 try {
226 discoveryAgent.serviceFailed(event);
227 } catch (IOException e) {
228 }
229 }
230
231 }
232 }
233 NetworkBridgeListener listener = new DiscoverNetworkBridgeListener(getBrokerService(), getObjectName());
234
235 DemandForwardingBridge result = NetworkBridgeFactory.createBridge(this, localTransport, remoteTransport, listener);
236 result.setBrokerService(getBrokerService());
237 return configureBridge(result);
238 }
239
240 @Override
241 public String toString() {
242 return "DiscoveryNetworkConnector:" + getName() + ":" + getBrokerService();
243 }
244 }