1 /*

     2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.internal.net.rdma;

    27 

    28 import java.io.FileDescriptor;

    29 import java.io.FileOutputStream;

    30 import java.io.IOException;

    31 import java.nio.channels.FileChannel;

    32 import java.net.Socket;

    33 import java.net.SocketException;

    34 

    35 class RdmaSocketOutputStream extends FileOutputStream

    36 {

    37     static {

    38         init();

    39     }

    40 

    41     private RdmaSocketImpl impl = null;

    42     private byte temp[] = new byte[1];

    43     private Socket socket = null;

    44 

    45     RdmaSocketOutputStream(RdmaSocketImpl impl) throws IOException {

    46         super(impl.getFileDescriptor());

    47         this.impl = impl;

    48         socket = impl.getSocket();

    49     }

    50 

    51     public final FileChannel getChannel() {

    52         return null;

    53     }

    54 

    55     /**

    56      * Writes to the socket.

    57      * @param fd the FileDescriptor

    58      * @param b the data to be written

    59      * @param off the start offset in the data

    60      * @param len the number of bytes that are written

    61      * @exception IOException If an I/O error has occurred.

    62      */

    63     private native void rdmaSocketWrite0(FileDescriptor fd, byte[] b,

    64             int off, int len) throws IOException;

    65 

    66     /**

    67      * Writes to the socket with appropriate locking of the

    68      * FileDescriptor.

    69      * @param b the data to be written

    70      * @param off the start offset in the data

    71      * @param len the number of bytes that are written

    72      * @exception IOException If an I/O error has occurred.

    73      */

    74     private void rdmaSocketWrite(byte b[], int off, int len)

    75             throws IOException {

    76         if (len <= 0 || off < 0 || len > b.length - off) {

    77             if (len == 0) {

    78                 return;

    79             }

    80             throw new ArrayIndexOutOfBoundsException("len == " + len

    81                     + " off == " + off + " buffer length == " + b.length);

    82         }

    83 

    84         FileDescriptor fd = impl.acquireFD();

    85         try {

    86             rdmaSocketWrite0(fd, b, off, len);

    87         } catch (SocketException se) {

    88             if (se instanceof sun.net.ConnectionResetException) {

    89                 impl.setConnectionResetPending();

    90                 se = new SocketException("Connection reset");

    91             }

    92             if (impl.isClosedOrPending()) {

    93                 throw new SocketException("Socket closed");

    94             } else {

    95                 throw se;

    96             }

    97         } finally {

    98             impl.releaseFD();

    99         }

   100     }

   101 

   102     /**

   103      * Writes a byte to the socket.

   104      * @param b the data to be written

   105      * @exception IOException If an I/O error has occurred.

   106      */

   107     public void write(int b) throws IOException {

   108         temp[0] = (byte)b;

   109         rdmaSocketWrite(temp, 0, 1);

   110     }

   111 

   112     /**

   113      * Writes the contents of the buffer <i>b</i> to the socket.

   114      * @param b the data to be written

   115      * @exception SocketException If an I/O error has occurred.

   116      */

   117     public void write(byte b[]) throws IOException {

   118         rdmaSocketWrite(b, 0, b.length);

   119     }

   120 

   121     /**

   122      * Writes <i>length</i> bytes from buffer <i>b</i> starting at

   123      * offset <i>len</i>.

   124      * @param b the data to be written

   125      * @param off the start offset in the data

   126      * @param len the number of bytes that are written

   127      * @exception SocketException If an I/O error has occurred.

   128      */

   129     public void write(byte b[], int off, int len) throws IOException {

   130         rdmaSocketWrite(b, off, len);

   131     }

   132 

   133     /**

   134      * Closes the stream.

   135      */

   136     private boolean closing = false;

   137     public void close() throws IOException {

   138         if (closing)

   139             return;

   140         closing = true;

   141         if (socket != null) {

   142             if (!socket.isClosed())

   143                 socket.close();

   144         } else

   145             impl.close();

   146         closing = false;

   147     }

   148 

   149     /**

   150      * Perform class load-time initializations.

   151      */

   152     private static native void init();

   153 

   154 }