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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.handler.stream;
21  
22  import java.io.IOException;
23  import java.io.OutputStream;
24  
25  import org.apache.mina.core.buffer.IoBuffer;
26  import org.apache.mina.core.future.WriteFuture;
27  import org.apache.mina.core.session.IoSession;
28  
29  /**
30   * An {@link OutputStream} that forwards all write operations to
31   * the associated {@link IoSession}.
32   *
33   * @author The Apache MINA Project (dev@mina.apache.org)
34   * @version $Rev: 671827 $, $Date: 2008-06-26 10:49:48 +0200 (jeu, 26 jun 2008) $
35   *
36   */
37  class IoSessionOutputStream extends OutputStream {
38      private final IoSession session;
39  
40      private WriteFuture lastWriteFuture;
41  
42      public IoSessionOutputStream(IoSession session) {
43          this.session = session;
44      }
45  
46      @Override
47      public void close() throws IOException {
48          try {
49              flush();
50          } finally {
51              session.close().awaitUninterruptibly();
52          }
53      }
54  
55      private void checkClosed() throws IOException {
56          if (!session.isConnected()) {
57              throw new IOException("The session has been closed.");
58          }
59      }
60  
61      private synchronized void write(IoBuffer buf) throws IOException {
62          checkClosed();
63          WriteFuture future = session.write(buf);
64          lastWriteFuture = future;
65      }
66  
67      @Override
68      public void write(byte[] b, int off, int len) throws IOException {
69          write(IoBuffer.wrap(b.clone(), off, len));
70      }
71  
72      @Override
73      public void write(int b) throws IOException {
74          IoBuffer buf = IoBuffer.allocate(1);
75          buf.put((byte) b);
76          buf.flip();
77          write(buf);
78      }
79  
80      @Override
81      public synchronized void flush() throws IOException {
82          if (lastWriteFuture == null) {
83              return;
84          }
85  
86          lastWriteFuture.awaitUninterruptibly();
87          if (!lastWriteFuture.isWritten()) {
88              throw new IOException(
89                      "The bytes could not be written to the session");
90          }
91      }
92  }