View Javadoc
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 <a href="http://mina.apache.org">Apache MINA Project</a>
34   */
35  class IoSessionOutputStream extends OutputStream {
36      private final IoSession session;
37  
38      private WriteFuture lastWriteFuture;
39  
40      public IoSessionOutputStream(IoSession session) {
41          this.session = session;
42      }
43  
44      @Override
45      public void close() throws IOException {
46          try {
47              flush();
48          } finally {
49              session.close(true).awaitUninterruptibly();
50          }
51      }
52  
53      private void checkClosed() throws IOException {
54          if (!session.isConnected()) {
55              throw new IOException("The session has been closed.");
56          }
57      }
58  
59      private synchronized void write(IoBuffer buf) throws IOException {
60          checkClosed();
61          WriteFuture future = session.write(buf);
62          lastWriteFuture = future;
63      }
64  
65      @Override
66      public void write(byte[] b, int off, int len) throws IOException {
67          write(IoBuffer.wrap(b.clone(), off, len));
68      }
69  
70      @Override
71      public void write(int b) throws IOException {
72          IoBuffer buf = IoBuffer.allocate(1);
73          buf.put((byte) b);
74          buf.flip();
75          write(buf);
76      }
77  
78      @Override
79      public synchronized void flush() throws IOException {
80          if (lastWriteFuture == null) {
81              return;
82          }
83  
84          lastWriteFuture.awaitUninterruptibly();
85          if (!lastWriteFuture.isWritten()) {
86              throw new IOException("The bytes could not be written to the session");
87          }
88      }
89  }