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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.codehaus.activemq.transport;
19  
20  import org.codehaus.activemq.message.WireFormat;
21  import org.codehaus.activemq.util.FactoryFinder;
22  
23  import javax.jms.JMSException;
24  import java.io.IOException;
25  import java.net.URI;
26  
27  /***
28   * A TransportChannel is used for tranporting packets between nodes
29   *
30   * @version $Revision: 1.12 $
31   */
32  public class TransportChannelProvider {
33      private static FactoryFinder finder = new FactoryFinder("META-INF/services/org/codehaus/activemq/transport/");
34  
35      /***
36       * Create a Channel to a remote Node - e.g. a Broker
37       *
38       * @param remoteLocation
39       * @return the TransportChannel bound to the remote node
40       * @throws JMSException
41       */
42      public static TransportChannel create(WireFormat wireFormat, URI remoteLocation) throws JMSException {
43          return getFactory(remoteLocation).create(wireFormat, remoteLocation);
44      }
45  
46      /***
47       * Create a Channel to a remote Node - e.g. a Broker
48       *
49       * @param remoteLocation
50       * @param localLocation  -
51       *                       e.g. local InetAddress and local port
52       * @return the TransportChannel bound to the remote node
53       * @throws JMSException
54       */
55      public static TransportChannel create(WireFormat wireFormat, URI remoteLocation, URI localLocation) throws JMSException {
56          return getFactory(remoteLocation).create(wireFormat, remoteLocation, localLocation);
57      }
58  
59      public static TransportChannelFactory getFactory(URI remoteLocation) throws JMSException {
60          String protocol = remoteLocation.getScheme();
61          try {
62              Object value = finder.newInstance(protocol);
63              if (value instanceof TransportChannelFactory) {
64                  return (TransportChannelFactory) value;
65              }
66              else {
67                  throw new JMSException("Factory does not implement TransportChannelFactory: " + value);
68              }
69          }
70          catch (IllegalAccessException e) {
71              throw createJMSexception(protocol, e);
72          }
73          catch (InstantiationException e) {
74              throw createJMSexception(protocol, e);
75          }
76          catch (IOException e) {
77              throw createJMSexception(protocol, e);
78          }
79          catch (ClassNotFoundException e) {
80              throw createJMSexception(protocol, e);
81          }
82  
83      }
84  
85      protected static JMSException createJMSexception(String protocol, Exception e) {
86          JMSException answer = new JMSException("Could not load protocol: " + protocol + ". Reason: " + e);
87          answer.setLinkedException(e);
88          return answer;
89      }
90  }