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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.composite;
19  
20  import org.codehaus.activemq.message.WireFormat;
21  import org.codehaus.activemq.transport.TransportChannel;
22  import org.codehaus.activemq.transport.TransportChannelFactory;
23  import org.codehaus.activemq.util.JMSExceptionHelper;
24  
25  import javax.jms.JMSException;
26  import java.net.URI;
27  import java.net.URISyntaxException;
28  import java.util.ArrayList;
29  import java.util.List;
30  import java.util.StringTokenizer;
31  
32  /***
33   * A Composite implementation of a TransportChannelFactory
34   *
35   * @version $Revision: 1.5 $
36   */
37  public class CompositeTransportChannelFactory implements TransportChannelFactory {
38      private String separator = ",";
39  
40      public TransportChannel create(WireFormat wireFormat, URI remoteLocation) throws JMSException {
41          try {
42              return new CompositeTransportChannel(wireFormat, parseURIs(remoteLocation));
43          }
44          catch (URISyntaxException e) {
45              throw JMSExceptionHelper.newJMSException("Can't parse list of URIs for: " + remoteLocation + ". Reason: " + e, e);
46          }
47      }
48  
49      public TransportChannel create(WireFormat wireFormat, URI remoteLocation, URI localLocation) throws JMSException {
50          return create(wireFormat, remoteLocation);
51      }
52  
53      public boolean requiresEmbeddedBroker() {
54          return false;
55      }
56  
57      protected List parseURIs(URI uri) throws URISyntaxException {
58          String text = uri.getSchemeSpecificPart();
59          List uris = new ArrayList();
60          StringTokenizer iter = new StringTokenizer(text, separator);
61          while (iter.hasMoreTokens()) {
62              String child = stripLeadingSlashes(iter.nextToken().trim());
63              uris.add(new URI(child));
64          }
65          return randomizeURIs(uris);
66      }
67  
68      protected String stripLeadingSlashes(String text) {
69          int idx = 0;
70          while (text.charAt(idx) == '/') {
71              idx++;
72          }
73          if (idx > 0) {
74              return text.substring(idx);
75          }
76          return text;
77      }
78  
79  
80      protected List randomizeURIs(List uris) {
81          return uris;
82      }
83  }