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

        // 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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                  chf = File.createTempFile("jcrvdedit", null, tempDirectory);
                  chch = new RandomAccessFile(chf, "rw").getChannel();


                  // allocate the space for whole file
                  MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, position + length, 0);
                  bb.force();
                  bb = null;


                  ReadableByteChannel bch = Channels.newChannel(new ByteArrayInputStream(this.data));


                  if ((newIndex = (int)position) > 0)

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            ReadableByteChannel ch = Channels.newChannel(stream);
            ch.read(bb);
            ch.close();


            bb.force();
         }
      }


      /**
       * Set length of the Value in bytes to the specified <code>size</code>.

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                  if (chch.size() < size)
                  {
                     // extend length
                     MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, size, 0);
                     bb.force();
                  }
               }
               catch (final IOException e)
               {
                  try

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         {
            if (spoolChannel.size() < size)
            {
               // extend file
               MappedByteBuffer bb = spoolChannel.map(FileChannel.MapMode.READ_WRITE, size, 0);
               bb.force();
            }
            else
            {
               // truncate file
               spoolChannel.truncate(size);

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                  chf = SpoolFile.createTempFile("jcrvdedit", null, tempDirectory);
                  chch = new RandomAccessFile(chf, "rw").getChannel();


                  // allocate the space for whole file
                  MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, position + length, 0);
                  bb.force();
                  bb = null;


                  ReadableByteChannel bch = Channels.newChannel(new ByteArrayInputStream(this.data));


                  if ((newIndex = (int)position) > 0)

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            ReadableByteChannel ch = Channels.newChannel(stream);
            ch.read(bb);
            ch.close();


            bb.force();
         }
      }


      /**
       * Set length of the Value in bytes to the specified <code>size</code>.

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                  if (chch.size() < size)
                  {
                     // extend length
                     MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, size, 0);
                     bb.force();
                  }
               }
               catch (final IOException e)
               {
                  try

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         {
            if (spoolChannel.size() < size)
            {
               // extend file
               MappedByteBuffer bb = spoolChannel.map(FileChannel.MapMode.READ_WRITE, size, 0);
               bb.force();
            }
            else
            {
               // truncate file
               spoolChannel.truncate(size);

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            MappedByteBuffer mappedByteBuffer = fc.map(MapMode.READ_WRITE, 0, this.fileLimitLength);
            mappedByteBuffer.put(LogEntity.MAGIC.getBytes());
            mappedByteBuffer.putInt(1);// 8 version
            mappedByteBuffer.putInt(-1);// 12next fileindex
            mappedByteBuffer.putInt(-2);// 16
            mappedByteBuffer.force();
            return true;
        } else {
            return false;
        }
    }

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