Examples of com.slytechs.utils.memory.BufferBlock

com.slytechs.utils.memory.BufferBlock
Buffer that can provide a partial view of a larger buffer or storage object. For example large files can be broken up into partial buffers where the buffer is only a small fraction of the underlying file. The partial buffer class maintains a start and length of the buffer in relation to the main backing storage such as the file or another buffer. @author Mark Bednarczyk @author Sly Technologies, Inc.


    this.length = total;


    this.buffer = this.allocate(this.length);
    this.partial =
        new BufferBlock(this.buffer, BitBuffer.wrap(this.buffer), 0,
            this.length);


    // Copy contents from all the elements buffer into our large buffer
    for (final ByteBuffer b : buffers) {
      this.buffer.put(b);

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        this.buffer = buffer;
      }
    }


    this.partial =
        new BufferBlock(this.buffer, BitBuffer.wrap(this.buffer), 0,
            this.length);
  }

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    this.buffer = this.allocate(this.length);
    this.buffer.put(buffer1);
    this.buffer.put(buffer2);


    this.partial =
        new BufferBlock(this.buffer, BitBuffer.wrap(this.buffer), 0,
            this.length);
  }

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    this.length = length;
    this.lengthGetter = overrideOffset(lengthGetter);
    this.buffer = this.allocate(length);


    this.partial =
        new BufferBlock(this.buffer, BitBuffer.wrap(this.buffer), 0, length);
  }

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  private BufferBlock fetchFromChannel(final long regional, final int length,
      FileMode mode, MemoryModel memoryModel) throws IOException {


    final boolean readwrite = mode.isContent();


    BufferBlock block = null;
    ByteBuffer buf;
    final int minimum = pickMinimumSize(regional, length);


    /*
     * Needed to make sure the file is synched. There were some intermittened
     * failures with HardRegionIndexer while it was scanning the entire file
     * without this force. Therefore it must be here. Some portions of the file
     * were lagging with the synch to the physical file.
     */
    channel.force(true);


    switch (memoryModel) {
      case MappedFile:
        final MapMode mapMode = ((readwrite) ? MapMode.READ_WRITE
            : MapMode.READ_ONLY);
        buf = this.channel.map(mapMode, regional, minimum);
        buf.clear();


        block = new BufferBlock(buf, BitBuffer.wrap(buf), regional, buf.capacity());
        block.getByteBuffer().order(this.byteOrder);


        System.gc();


        break;


      case DirectBuffer:
        System.out.flush();


        buf = ByteBuffer.allocateDirect(minimum);
        buf.clear();


        this.channel.position(regional);
        int s = this.channel.read(buf);
        buf.clear();


        buf = BufferUtils.asReadonly(buf);


        block = new BufferBlock(buf, BitBuffer.wrap(buf), regional, s);
        block.getByteBuffer().order(this.byteOrder);


        break;


      case ByteArray:


        buf = ByteBuffer.allocate(minimum);
        buf.clear();


        this.channel.position(regional);
        s = this.channel.read(buf);
        buf.clear();


        buf = BufferUtils.asReadonly(buf);


        block = new BufferBlock(buf, BitBuffer.wrap(buf), regional, s);
        block.getByteBuffer().order(this.byteOrder);


        break;


      default:
        throw new IllegalStateException("Unknown memory model encountered "

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   * @throws IOException
   */
  private PartialBuffer fetchFromChannelAndCache(long regional, int length,
      MemoryModel memoryModel) throws IOException {


    final BufferBlock partial = fetchFromChannel(regional, length, mode,
        memoryModel);
    partial.reposition(regional, length);


    cache.add(partial);
    globalCache.add(partial);


    return partial;

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  private void setupBuffer(int cap, ByteBuffer old) {


    this.buffer = ByteBuffer.allocate(cap);
    this.buffer.order(order);
    this.rwBlock = new BufferBlock(this.buffer, null, 0, cap);
    this.buffer.limit(0);


    this.view = BufferUtils.asReadonly(buffer);
    this.roBlock = new BufferBlock(this.view, null, 0, cap);
    this.view.limit(0);


    /*
     * Lastly copy any remnants left in the old view buffer into our new buffer.
     * Typically the header is partially read from the stream then if the length

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Related Classes of com.slytechs.utils.memory.BufferBlock

com.slytechs.capture.file.editor.MemoryCacheLoader

com.slytechs.capture.file.editor.PartialFileLoader

com.slytechs.capture.file.RawInputIterator

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