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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;
21  
22  import java.io.IOException;
23  import java.util.Queue;
24  
25  import org.apache.mina.common.ByteBuffer;
26  import org.apache.mina.common.IoFilter.WriteRequest;
27  import org.apache.mina.common.IoFilterChain;
28  import org.apache.mina.common.IoSession;
29  import org.apache.mina.common.support.AbstractIoFilterChain;
30  
31  /**
32   * An {@link IoFilterChain} for socket transport (TCP/IP).
33   *
34   * @author The Apache Directory Project (mina-dev@directory.apache.org)
35   */
36  class SocketFilterChain extends AbstractIoFilterChain {
37  
38      SocketFilterChain(IoSession parent) {
39          super(parent);
40      }
41  
42      @Override
43      protected void doWrite(IoSession session, WriteRequest writeRequest) {
44          SocketSessionImpl s = (SocketSessionImpl) session;
45          Queue<WriteRequest> writeRequestQueue = s.getWriteRequestQueue();
46  
47          // SocketIoProcessor.doFlush() will reset it after write is finished
48          // because the buffer will be passed with messageSent event.
49          ByteBuffer buffer = (ByteBuffer) writeRequest.getMessage();
50          buffer.mark();
51  
52          int remaining = buffer.remaining();
53          if (remaining == 0) {
54              s.increaseScheduledWriteRequests();            
55          } else {
56              s.increaseScheduledWriteBytes(buffer.remaining());
57          }
58  
59          writeRequestQueue.add(writeRequest);
60  
61          if (session.getTrafficMask().isWritable()) {
62              s.getIoProcessor().flush(s);
63          }
64      }
65  
66      @Override
67      protected void doClose(IoSession session) throws IOException {
68          SocketSessionImpl s = (SocketSessionImpl) session;
69          s.getIoProcessor().remove(s);
70      }
71  }