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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  
19  package org.codehaus.activemq.transport.reliable;
20  
21  import org.codehaus.activemq.message.WireFormat;
22  import org.codehaus.activemq.transport.TransportChannel;
23  import org.codehaus.activemq.transport.composite.CompositeTransportChannelFactory;
24  import org.codehaus.activemq.util.JMSExceptionHelper;
25  
26  import javax.jms.JMSException;
27  import java.net.URI;
28  import java.net.URISyntaxException;
29  import java.util.ArrayList;
30  import java.util.Arrays;
31  import java.util.List;
32  
33  /***
34   * A Reliable implementation of a TransportChannelFactory
35   *
36   * @version $Revision: 1.2 $
37   */
38  public class ReliableTransportChannelFactory extends CompositeTransportChannelFactory {
39      ;
40  
41      /***
42       * Create a TransportChannel
43       *
44       * @param wireFormat     - the on-the-wire marshaller
45       * @param remoteLocation - location to bind to
46       * @return a reliable transport channel
47       * @throws JMSException if an error occurs
48       */
49      public TransportChannel create(WireFormat wireFormat, URI remoteLocation) throws JMSException {
50          try {
51              return new ReliableTransportChannel(wireFormat, parseURIs(remoteLocation));
52          }
53          catch (URISyntaxException e) {
54              throw JMSExceptionHelper.newJMSException("Can't parse list of URIs for: " + remoteLocation + ". Reason: "
55                      + e, e);
56          }
57      }
58  
59      /***
60       * @param uris - the URIs to randomize
61       * @return randomized array
62       */
63      protected List randomizeURIs(List uris) {
64          if (!uris.isEmpty()) {
65              int size = uris.size();
66              Object[] result = new Object[size];
67              SMLCGRandom random = new SMLCGRandom();
68              int startIndex = (int) (random.nextDouble() * (size + 1));
69              int count = 0;
70              for (int i = startIndex; i < size; i++) {
71                  result[count++] = uris.get(i);
72              }
73              for (int i = 0; i < startIndex; i++) {
74                  result[count++] = uris.get(i);
75              }
76              return new ArrayList(Arrays.asList(result));
77          }
78          return uris;
79      }
80  }