Examples of java.nio.MappedByteBuffer.force()

java.nio.MappedByteBuffer.force()
Forces any changes made to this buffer's content to be written to the storage device containing the mapped file.
If the file mapped into this buffer resides on a local storage device then when this method returns it is guaranteed that all changes made to the buffer since it was created, or since this method was last invoked, will have been written to that device.
If the file does not reside on a local device then no such guarantee is made.
If this buffer was not mapped in read/write mode ( {@link java.nio.channels.FileChannel.MapMode#READ_WRITE}) then invoking this method has no effect.
@return This buffer

        .removalListener(new RemovalListener<Integer, MappedByteBuffer>() {
          @Override
          public void onRemoval(RemovalNotification<Integer, MappedByteBuffer> notification) {
            MappedByteBuffer value = notification.getValue();
            if (value != null) {
              value.force();
            }
          }})
        .build(new CacheLoader<Integer, MappedByteBuffer>() {
          @Override
          public MappedByteBuffer load(Integer key) throws Exception {

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                size_hi.length;
        byte value = bb.get(pos);
        value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }

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            value++;
        else
            value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }

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    if (readerIndex >= 0) {
      buffer.putLong(16, readerIndex);
    }


    buffer.force();
    raf.close();
  }


  @Test
  public void updateWriterIndex() throws Exception {

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        assertEquals(CONTENT_LENGTH, mapped.limit());
        // test copy on write if private
        ByteBuffer returnByPut = mapped.put(TEST_BYTES);
        assertSame(returnByPut, mapped);
        ByteBuffer checkBuffer = ByteBuffer.allocate(CONTENT_LENGTH);
        mapped.force();
        readWriteFileChannel.read(checkBuffer);
        assertEquals(CONTENT, new String(checkBuffer.array(), "iso8859-1"));


        // test overflow
        try {

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        // put something will change its channel
        ByteBuffer returnByPut = mapped.put(TEST_BYTES);
        assertSame(returnByPut, mapped);
        String checkString = "test" + CONTENT.substring(4);
        ByteBuffer checkBuffer = ByteBuffer.allocate(CONTENT_LENGTH);
        mapped.force();
        readWriteFileChannel.position(0);
        readWriteFileChannel.read(checkBuffer);
        assertEquals(checkString, new String(checkBuffer.array(), "iso8859-1"));


        try {

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                size_hi.length;
        byte value = bb.get(pos);
        value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }

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            value++;
        else
            value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }

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                            }
                            synchronized (lock) {
                                globalBuffer.rewind();
                                globalBuffer.put(bb); // modification of the synchronized memory
                                try {
                                    bb.force();
                                } catch (Exception e) {
                                    e.printStackTrace(); // sometimes possible in usual situation
                                }
                                System.out.println(msg + " corrected and saved");
                            }

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

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