Package java.nio.channels

Examples of java.nio.channels.FileChannel.map()

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                       || (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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        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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     */
    public void testasIntBuffer() throws IOException {
        // Map file
        FileInputStream fis = new FileInputStream(tmpFile);
        FileChannel fc = fis.getChannel();
        MappedByteBuffer mmb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc
                .size());
        int len = mmb.capacity();
        assertEquals("Got wrong number of bytes", 46, len); //$NON-NLS-1$

        // Read in our 26 bytes
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     */
    public void testEmptyBuffer() throws IOException {
      // Map empty file
        FileInputStream fis = new FileInputStream(emptyFile);
        FileChannel fc = fis.getChannel();
        MappedByteBuffer mmb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
       
        // check non-null
        assertNotNull("MappedByteBuffer created from empty file should not be null",
            mmb);
       
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        }
       
        // test expected exceptions thrown
        try
        {
          mmb = fc.map(FileChannel.MapMode.READ_WRITE, 0, fc.size());
          fail("Expected NonWritableChannelException to be thrown");
        }
        catch (NonWritableChannelException e)
        {
          // expected behaviour
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        {
          // expected behaviour
        }
        try
        {
          mmb = fc.map(FileChannel.MapMode.PRIVATE, 0, fc.size());
          fail("Expected NonWritableChannelException to be thrown");
        }
        catch (NonWritableChannelException e)
        {
          // expected behaviour
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     */
    public void test_force() throws IOException {
        // buffer was not mapped in read/write mode
        FileInputStream fileInputStream = new FileInputStream(tmpFile);
        FileChannel fileChannelRead = fileInputStream.getChannel();
        MappedByteBuffer mmbRead = fileChannelRead.map(MapMode.READ_ONLY, 0,
                fileChannelRead.size());

        mmbRead.force();

        FileInputStream inputStream = new FileInputStream(tmpFile);
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        mmbRead.force();

        FileInputStream inputStream = new FileInputStream(tmpFile);
        FileChannel fileChannelR = inputStream.getChannel();
        MappedByteBuffer resultRead = fileChannelR.map(MapMode.READ_ONLY, 0,
                fileChannelR.size());

        //If this buffer was not mapped in read/write mode, then invoking this method has no effect.
        assertEquals(
                "Invoking force() should have no effect when this buffer was not mapped in read/write mode",
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                mmbRead, resultRead);

        // Buffer was mapped in read/write mode
        RandomAccessFile randomFile = new RandomAccessFile(tmpFile, "rw");
        FileChannel fileChannelReadWrite = randomFile.getChannel();
        MappedByteBuffer mmbReadWrite = fileChannelReadWrite.map(
                FileChannel.MapMode.READ_WRITE, 0, fileChannelReadWrite.size());

        mmbReadWrite.put((byte) 'o');
        mmbReadWrite.force();
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        mmbReadWrite.put((byte) 'o');
        mmbReadWrite.force();

        RandomAccessFile random = new RandomAccessFile(tmpFile, "rw");
        FileChannel fileChannelRW = random.getChannel();
        MappedByteBuffer resultReadWrite = fileChannelRW.map(
                FileChannel.MapMode.READ_WRITE, 0, fileChannelRW.size());

        // Invoking force() will change the buffer
        assertFalse(mmbReadWrite.equals(resultReadWrite));
       
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