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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 java.util.Queue;
23  
24  import org.apache.mina.common.ByteBuffer;
25  import org.apache.mina.common.IoFilter.WriteRequest;
26  import org.apache.mina.common.IoFilterChain;
27  import org.apache.mina.common.IoSession;
28  import org.apache.mina.common.support.AbstractIoFilterChain;
29  
30  /**
31   * An {@link IoFilterChain} for datagram transport (UDP/IP).
32   *
33   * @author The Apache Directory Project (mina-dev@directory.apache.org)
34   */
35  class DatagramFilterChain extends AbstractIoFilterChain {
36  
37      DatagramFilterChain(IoSession parent) {
38          super(parent);
39      }
40  
41      @Override
42      protected void doWrite(IoSession session, WriteRequest writeRequest) {
43          DatagramSessionImpl s = (DatagramSessionImpl) session;
44          Queue<WriteRequest> writeRequestQueue = s.getWriteRequestQueue();
45  
46          // SocketIoProcessor.doFlush() will reset it after write is finished
47          // because the buffer will be passed with messageSent event.
48          ((ByteBuffer) writeRequest.getMessage()).mark();
49          synchronized (writeRequestQueue) {
50              writeRequestQueue.add(writeRequest);
51              if (writeRequestQueue.size() == 1
52                      && session.getTrafficMask().isWritable()) {
53                  // Notify DatagramService only when writeRequestQueue was empty.
54                  s.getManagerDelegate().flushSession(s);
55              }
56          }
57      }
58  
59      @Override
60      protected void doClose(IoSession session) {
61          DatagramSessionImpl s = (DatagramSessionImpl) session;
62          DatagramService manager = s.getManagerDelegate();
63          if (manager instanceof DatagramConnectorDelegate) {
64              manager.closeSession(s);
65          } else {
66              ((DatagramAcceptorDelegate) manager).getListeners()
67                      .fireSessionDestroyed(session);
68              session.getCloseFuture().setClosed();
69          }
70      }
71  }