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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.apache.commons.logging.Log;
21  import org.apache.commons.logging.LogFactory;
22  
23  import javax.jms.JMSException;
24  import java.util.ArrayList;
25  import java.util.Iterator;
26  import java.util.List;
27  
28  /***
29   * An abstract base class useful for implementation inheritence
30   *
31   * @version $Revision: 1.3 $
32   */
33  public abstract class TransportServerChannelSupport implements TransportServerChannel {
34  
35      private static final Log log = LogFactory.getLog(TransportServerChannelSupport.class);
36  
37      private TransportChannelListener listener;
38      private List channels = new ArrayList();
39  
40      public void start() throws JMSException {
41          if (listener == null) {
42              throw new JMSException("Must have a TransportChannelListener attached!");
43          }
44      }
45  
46      public synchronized void stop() {
47          for (Iterator iter = channels.iterator(); iter.hasNext();) {
48              TransportChannel channel = (TransportChannel) iter.next();
49              channel.stop();
50          }
51      }
52  
53      public void setTransportChannelListener(TransportChannelListener listener) {
54          this.listener = listener;
55      }
56  
57      protected synchronized void addClient(TransportChannel channel) {
58          if (listener == null) {
59              log.warn("No listener attached, cannot add channel: " + channel);
60          }
61          else {
62              listener.addClient(channel);
63              channel.setTransportChannelListener(listener);
64              channels.add(channel);
65          }
66      }
67  }