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

        os.write(src);
        os.close();


        @SuppressWarnings("resource")
        FileChannel channel = new RandomAccessFile(tmp, "r").getChannel();
        MappedByteBuffer buf = channel.map(MapMode.READ_ONLY, 0L, tmp.length());
        return buf;
      } catch (IOException e) {
        throw new AssertionError(e);
      }
    }

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Examples of java.nio.MappedByteBuffer

  
  private static 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("UTF-8").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.defaultCharset().decode(bb).toString();
    } finally {
      stream.close();

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Examples of java.nio.MappedByteBuffer

                raf = new RandomAccessFile(path, "r");
                for (int i = 0; i < segcount; i++)
                {
                    long start = boundaries.get(i);
                    long size = boundaries.get(i + 1) - start;
                    MappedByteBuffer segment = size <= MAX_SEGMENT_SIZE
                                               ? raf.getChannel().map(FileChannel.MapMode.READ_ONLY, start, size)
                                               : null;
                    segments[i] = new Segment(start, segment);
                }
            }

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Examples of java.nio.MappedByteBuffer

   */
  public static MappableBlock load(long length,
      FileInputStream blockIn, FileInputStream metaIn,
      String blockFileName) throws IOException {
    MappableBlock mappableBlock = null;
    MappedByteBuffer mmap = null;
    FileChannel blockChannel = null;
    try {
      blockChannel = blockIn.getChannel();
      if (blockChannel == null) {
        throw new IOException("Block InputStream has no FileChannel.");

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Examples of java.nio.MappedByteBuffer

  private String getFileFromClasspathAsString(String classPathFilePath, String encoding) throws IOException, URISyntaxException {
    String output = "";
    FileInputStream stream = new FileInputStream(new File(getClass().getResource(classPathFilePath).toURI()));
    try {
      FileChannel fc = stream.getChannel();
      MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0,fc.size());
      output = Charset.forName(encoding).decode(bb).toString();
    } finally {
      stream.close();
    }
    return output;

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Examples of java.nio.MappedByteBuffer


  private static String readFile(File file) throws IOException {
    FileInputStream stream = new FileInputStream(file);
    try {
      FileChannel fc = stream.getChannel();
      MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
      return Charset.defaultCharset().decode(bb).toString();
    }
    finally {
      stream.close();
    }

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Examples of java.nio.MappedByteBuffer

                       || (start>0 && start<=logFileTime && end>0 && end>=logFileTime)) {


                        // It's in the range, so process the file
                        RandomAccessFile raf = new RandomAccessFile(logFiles[i], "r");
                        FileChannel fc = raf.getChannel();
                        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
                        CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Tomcat use a different charset on a foreign PC?
                        Matcher lines = FULL_LINE_PATTERN.matcher(cb);
                        Matcher target = ACCESS_LOG_PATTERN.matcher("");
                        SimpleDateFormat format = (start == 0 && end == 0) ? null : new SimpleDateFormat(ACCESS_LOG_DATE_FORMAT);
                        int max = maxResults == null ? MAX_SEARCH_RESULTS : Math.min(maxResults.intValue(), MAX_SEARCH_RESULTS);

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Examples of java.nio.MappedByteBuffer

        boolean capped = false;
        int lineCount = 0;
        try {
            RandomAccessFile raf = new RandomAccessFile(file, "r");
            FileChannel fc = raf.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Log4J use a different charset on a foreign PC?
            Matcher target = null;
            Matcher any = null;
            Matcher lines = FULL_LINE_PATTERN.matcher(cb);
            Matcher text = textSearch == null ? null : textSearch.matcher("");

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Examples of java.nio.MappedByteBuffer

                       || (start>0 && start<=logFileTime && end>0 && end>=logFileTime)) {


                        // It's in the range, so process the file
                        RandomAccessFile raf = new RandomAccessFile(logFiles[i], "r");
                        FileChannel fc = raf.getChannel();
                        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
                        CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Jetty use a different charset on a foreign PC?
                        Matcher lines = FULL_LINE_PATTERN.matcher(cb);
                        Matcher target = ACCESS_LOG_PATTERN.matcher("");
                        SimpleDateFormat format = (start == 0 && end == 0) ? null : new SimpleDateFormat(ACCESS_LOG_DATE_FORMAT);
                        int max = maxResults == null ? MAX_SEARCH_RESULTS : Math.min(maxResults.intValue(), MAX_SEARCH_RESULTS);

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