Examples of MappedByteBuffer

java.nio.MappedByteBuffer
A direct byte buffer whose content is a memory-mapped region of a file.
Mapped byte buffers are created via the {@link java.nio.channels.FileChannel#map FileChannel.map} method. This classextends the {@link ByteBuffer} class with operations that are specific tomemory-mapped file regions.
A mapped byte buffer and the file mapping that it represents remain valid until the buffer itself is garbage-collected.
The content of a mapped byte buffer can change at any time, for example if the content of the corresponding region of the mapped file is changed by this program or another. Whether or not such changes occur, and when they occur, is operating-system dependent and therefore unspecified.
All or part of a mapped byte buffer may become inaccessible at any time, for example if the mapped file is truncated. An attempt to access an inaccessible region of a mapped byte buffer will not change the buffer's content and will cause an unspecified exception to be thrown either at the time of the access or at some later time. It is therefore strongly recommended that appropriate precautions be taken to avoid the manipulation of a mapped file by this program, or by a concurrently running program, except to read or write the file's content.
Mapped byte buffers otherwise behave no differently than ordinary direct byte buffers.
@author Mark Reinhold @author JSR-51 Expert Group @version 1.25, 09/02/26 @since 1.4

Examples of java.nio.MappedByteBuffer

                    length = TRANSFER_CHUNK_SIZE;
                } else {
                    length = remaining;
                }
                    
                MappedByteBuffer buffer = fileChannel.map(MapMode.READ_ONLY, offset, length);
                long written = write(buffer);
                    
                offset += written;
                remaining -= written;
            } while (remaining > 0);

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Examples of java.nio.MappedByteBuffer

                    length = TRANSFER_BYTE_BUFFER_MAX_MAP_SIZE;
                } else {
                    length = remaining.get();
                }
                
                MappedByteBuffer buffer = fc.map(MapMode.READ_ONLY, offset.get(), length);
                ByteBuffer[] bufs = new ByteBuffer[] { buffer };


                if (LOG.isLoggable(Level.FINE)) {
                    LOG.fine("[" + id + "] writing data (size=" + length + " bytes)");
                }

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Examples of java.nio.MappedByteBuffer

                            length = 4096;
                        } else {
                            length = remaining;
                        }
                        
                        MappedByteBuffer buffer = fc.map(MapMode.READ_ONLY, offset, length);
                        ByteBuffer[] bufs = new ByteBuffer[] { buffer };
                  
                        outChannel.write(bufs, this);
                            
                        offset += length;

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Examples of java.nio.MappedByteBuffer

                    length = TRANSFER_CHUNK_SIZE;
                } else {
                    length = remaining;
                }
                    
                MappedByteBuffer buffer = fileChannel.map(MapMode.READ_ONLY, offset, length);
                long written = write(buffer);
                    
                offset += written;
                remaining -= written;
            } while (remaining > 0);

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Examples of java.nio.MappedByteBuffer

                  length = TRANSFER_BYTE_BUFFER_MAX_MAP_SIZE;
              } else {
                  length = remaining;
              }
              
              MappedByteBuffer buffer = fc.map(MapMode.READ_ONLY, offset, length);
              ByteBuffer[] bufs = new ByteBuffer[] { buffer };
              bufferHashcode = bufs.hashCode();


          if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("[" + id + "] {" + bufferHashcode + "} writing data (size=" + length + " bytes)");

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Examples of java.nio.MappedByteBuffer

                  length = TRANSFER_BYTE_BUFFER_MAX_MAP_SIZE;
              } else {
                  length = remaining;
              }
              
              MappedByteBuffer buffer = fc.map(MapMode.READ_ONLY, offset, length);
              ByteBuffer[] bufs = new ByteBuffer[] { buffer };
              bufferHashcode = bufs.hashCode();


          if (LOG.isLoggable(Level.FINE)) {
            LOG.fine("[" + id + "] {" + bufferHashcode + "} writing data (size=" + length + " bytes)");

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Examples of java.nio.MappedByteBuffer

  
  private String readFile(String path) throws IOException {
    FileInputStream stream = new FileInputStream(new File(path));
    try {
      FileChannel fc = stream.getChannel();
      MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc
          .size());
      /* Instead of using default, pass in a decoder. */
      return Charset.forName("ISO-8859-1").decode(bb).toString();
    } finally {
      stream.close();

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Examples of java.nio.MappedByteBuffer

  
  private String readFile(String path) throws IOException {
    FileInputStream stream = new FileInputStream(new File(path));
    try {
      FileChannel fc = stream.getChannel();
      MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc
          .size());
      /* Instead of using default, pass in a decoder. */
      return Charset.forName("ISO-8859-1").decode(bb).toString();
    } finally {
      stream.close();

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Examples of java.nio.MappedByteBuffer

            }
            in = new FileInputStream(source).getChannel();
            out = new FileOutputStream(dest).getChannel();


            long size = in.size();
            MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY, 0, size);


            out.write(buf);


        } finally {
            if (in != null) {

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Examples of java.nio.MappedByteBuffer

    public static boolean compareFiles(File f1, File f2) throws Exception {
        RandomAccessFile i1 = new RandomAccessFile(f1, "r");
        try {
            RandomAccessFile i2 = new RandomAccessFile(f2, "r");
            try {
                final MappedByteBuffer m1 = i1.getChannel().map(MapMode.READ_ONLY, 0, i1.length());
                final MappedByteBuffer m2 = i2.getChannel().map(MapMode.READ_ONLY, 0, i2.length());
                while (m1.hasRemaining() && m2.hasRemaining()) {
                    final byte b1 = m1.get();
                    final byte b2 = m2.get();
                    if (b1 != b2)
                        return false;


                }
                if (m1.hasRemaining() || m2.hasRemaining())
                    return false;
            } finally {
                i2.close();
            }
        } finally {

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