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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 <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  }