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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.http;
19  
20  import EDU.oswego.cs.dl.util.concurrent.SynchronizedBoolean;
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.codehaus.activemq.message.TextWireFormat;
24  import org.codehaus.activemq.transport.TransportChannelSupport;
25  
26  import javax.jms.JMSException;
27  
28  /***
29   * @version $Revision: 1.3 $
30   */
31  public abstract class HttpTransportChannelSupport extends TransportChannelSupport implements Runnable {
32      private static final Log log = LogFactory.getLog(HttpTransportChannelSupport.class);
33  
34      private TextWireFormat wireFormat;
35      private String remoteUrl;
36      private Thread thread; // should use pool
37      private SynchronizedBoolean closed = new SynchronizedBoolean(false);
38      private SynchronizedBoolean started = new SynchronizedBoolean(false);
39  
40      public HttpTransportChannelSupport(TextWireFormat wireFormat, String remoteUrl) {
41          this.wireFormat = wireFormat;
42          this.remoteUrl = remoteUrl;
43      }
44  
45      public boolean isMulticast() {
46          return false;
47      }
48  
49      public void start() throws JMSException {
50          if (started.commit(false, true)) {
51              if (getClientID() != null) {
52                  startThread();
53              }
54          }
55      }
56  
57      protected void startThread() {
58          thread = new Thread(this, toString());
59          thread.start();
60      }
61  
62      public void stop() {
63          if (closed.commit(false, true)) {
64              super.stop();
65          }
66      }
67  
68      public synchronized void setClientID(String clientID) {
69          super.setClientID(clientID);
70          if (clientID != null && thread == null && started.get()) {
71              startThread();
72          }
73      }
74  
75      public String toString() {
76          return "HTTP Reader " + getRemoteUrl();
77      }
78      
79      /***
80       * Can this wireformat process packets of this version
81       * @param version the version number to test
82       * @return true if can accept the version
83       */
84      public boolean canProcessWireFormatVersion(int version){
85          return wireFormat.canProcessWireFormatVersion(version);
86      }
87      
88      /***
89       * @return the current version of this wire format
90       */
91      public int getCurrentWireFormatVersion(){
92          return wireFormat.getCurrentWireFormatVersion();
93      }
94  
95      // Properties
96      //-------------------------------------------------------------------------
97      public String getRemoteUrl() {
98          return remoteUrl;
99      }
100 
101     public TextWireFormat getWireFormat() {
102         return wireFormat;
103     }
104 
105     public void setWireFormat(TextWireFormat wireFormat) {
106         this.wireFormat = wireFormat;
107     }
108 
109     public SynchronizedBoolean getClosed() {
110         return closed;
111     }
112 
113     public SynchronizedBoolean getStarted() {
114         return started;
115     }
116 }