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1   /***
2    *
3    * Copyright 2004 Hiram Chirino
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  package org.activeio.adapter;
18  
19  import java.io.IOException;
20  
21  import org.activeio.AsynchChannel;
22  import org.activeio.AsynchChannelListener;
23  import org.activeio.Packet;
24  import org.activeio.RequestChannel;
25  import org.activeio.RequestListener;
26  import org.activeio.packet.EOSPacket;
27  
28  
29  /***
30   * Creates a {@see org.activeio.RequestChannel} out of a {@see org.activeio.AsynchChannel}.
31   * Does not support sending requests.  It can only be used to handle requests.  
32   * 
33   * @version $Revision$
34   */
35  public class AsynchChannelToServerRequestChannel implements RequestChannel, AsynchChannelListener {
36      
37      private final AsynchChannel next;
38      private RequestListener requestListener;
39      
40      public AsynchChannelToServerRequestChannel(AsynchChannel next) throws IOException {
41          this.next = next;
42          next.setAsynchChannelListener(this);
43      }
44  
45      public Packet request(Packet request, long timeout) throws IOException {
46          throw new IOException("Operation not supported.");
47      }
48  
49      public void setRequestListener(RequestListener requestListener) throws IOException {
50          this.requestListener = requestListener;      
51      }
52  
53      public RequestListener getRequestListener() {
54          return requestListener;
55      }
56  
57      public Object narrow(Class target) {
58          return next.narrow(target);
59      }
60  
61      public void dispose() {
62          next.dispose();
63      }
64  
65      public void start() throws IOException {
66          next.start();
67      }
68  
69      public void stop(long timeout) throws IOException {
70          next.stop(timeout);
71      }
72  
73      public void onPacket(Packet packet) {
74          if( packet == EOSPacket.EOS_PACKET ) {
75              return;
76          }
77          try {
78              Packet response = requestListener.onRequest(packet);
79              next.write(response);
80              next.flush();
81          } catch (IOException e) {
82              requestListener.onRquestError(e);
83          }
84      }
85  
86      public void onPacketError(IOException error) {
87          requestListener.onRquestError(error);
88      }
89  }