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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  
24  import org.apache.mina.common.ByteBuffer;
25  import org.apache.mina.common.IoFilterChain;
26  import org.apache.mina.common.IoSession;
27  import org.apache.mina.common.IoFilter.WriteRequest;
28  import org.apache.mina.common.support.AbstractIoFilterChain;
29  import org.apache.mina.util.Queue;
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      protected void doWrite(IoSession session, WriteRequest writeRequest) {
43          SocketSessionImpl s = (SocketSessionImpl) session;
44          Queue 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 buffer = (ByteBuffer) writeRequest.getMessage();
49          buffer.mark();
50          
51          int remaining = buffer.remaining();
52          if (remaining == 0) {
53              s.increaseScheduledWriteRequests();            
54          } else {
55              s.increaseScheduledWriteBytes(buffer.remaining());
56          }
57  
58          synchronized (writeRequestQueue) {
59              writeRequestQueue.push(writeRequest);
60          }
61          
62          if (session.getTrafficMask().isWritable()) {
63              s.getIoProcessor().flush(s);
64          }
65      }
66  
67      protected void doClose(IoSession session) throws IOException {
68          SocketSessionImpl s = (SocketSessionImpl) session;
69          s.getIoProcessor().remove(s);
70      }
71  }