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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.mina.transport.socket.nio.support;
21  
22  import org.apache.mina.common.ByteBuffer;
23  import org.apache.mina.common.IoFilterChain;
24  import org.apache.mina.common.IoSession;
25  import org.apache.mina.common.IoFilter.WriteRequest;
26  import org.apache.mina.common.support.AbstractIoFilterChain;
27  import org.apache.mina.util.Queue;
28  
29  /**
30   * An {@link IoFilterChain} for datagram transport (UDP/IP).
31   * 
32   * @author The Apache Directory Project (mina-dev@directory.apache.org)
33   */
34  class DatagramFilterChain extends AbstractIoFilterChain {
35  
36      DatagramFilterChain(IoSession parent) {
37          super(parent);
38      }
39  
40      protected void doWrite(IoSession session, WriteRequest writeRequest) {
41          DatagramSessionImpl s = (DatagramSessionImpl) session;
42          Queue writeRequestQueue = s.getWriteRequestQueue();
43  
44          // SocketIoProcessor.doFlush() will reset it after write is finished
45          // because the buffer will be passed with messageSent event. 
46          ((ByteBuffer) writeRequest.getMessage()).mark();
47          synchronized (writeRequestQueue) {
48              writeRequestQueue.push(writeRequest);
49              if (writeRequestQueue.size() == 1
50                      && session.getTrafficMask().isWritable()) {
51                  // Notify DatagramService only when writeRequestQueue was empty.
52                  s.getManagerDelegate().flushSession(s);
53              }
54          }
55      }
56  
57      protected void doClose(IoSession session) {
58          DatagramSessionImpl s = (DatagramSessionImpl) session;
59          DatagramService manager = s.getManagerDelegate();
60          if (manager instanceof DatagramConnectorDelegate) {
61              ((DatagramConnectorDelegate) manager).closeSession(s);
62          } else {
63              ((DatagramAcceptorDelegate) manager).getListeners()
64                      .fireSessionDestroyed(session);
65              session.getCloseFuture().setClosed();
66          }
67      }
68  }