Ejemplo n.º 1
0
  protected void flushFromExternalBuffer(byte[] buffer, int offset, int length) throws IOException {
    assert (recordCount > 0);
    assert (recordSizeBufferPos > 0);

    BlockType blockType = BlockType.INVALID;
    int blockBodySize = 0;
    if (recordCount == 1) {
      blockType = BlockType.SINGLE;
      blockBodySize = length;
    } else if (recordSize >= 0) {
      blockType = BlockType.FIXED;
      blockBodySize = Varint.size(recordSize) + length;
      if (recordSize == 0) {
        blockBodySize += Varint.size(recordCount);
      }
    } else {
      blockType = BlockType.VARIABLE;
      blockBodySize = Varint.size(recordSizeBufferPos) + recordSizeBufferPos + length;
    }

    checksum = Constants.CRC32_INIT_VALUE;
    writeBytes(Constants.BLOCK_HEADER_MAGIC, 0, Constants.BLOCK_HEADER_MAGIC.length, true);
    writeByte(blockType.getValue(), true);
    writeVarint(blockBodySize, true);

    short headerChecksum = CRC32.toCRC16(checksum);
    writeShort(headerChecksum, false);

    switch (blockType) {
      case FIXED:
        writeVarint(recordSize, true);
        if (recordSize == 0) {
          writeVarint(recordCount, true);
        }
        break;
      case VARIABLE:
        writeVarint(recordSizeBufferPos, true);
        writeBytes(recordSizeBuffer, 0, recordSizeBufferPos, true);
        break;
      case SINGLE:
        break;
      default:
        break;
    }
    writeBytes(buffer, offset, length, true);

    writeInt(checksum, false);
    output.flush();

    recordSize = RECORD_SIZE_INIT;
    recordCount = 0;
    recordSizeBufferPos = 0;
    recordBufferPos = 0;
  }
Ejemplo n.º 2
0
  public boolean write(byte[] buffer, int offset, int length) throws IOException {
    if (length > Constants.MAX_RECORD_SIZE) {
      return false;
    }
    if (recordSizeBuffer == null) {
      recordSizeBuffer = new byte[Constants.RECORD_SIZE_BUFFER_SIZE];
    }
    if (recordBuffer == null) {
      recordBuffer = new byte[Constants.RECORD_BUFFER_SIZE];
    }

    if (recordCount > 0) {
      if ((recordBufferPos + length) >= Constants.RECORD_BUFFER_SIZE
          || recordSizeBufferPos + Varint.size(length) >= Constants.RECORD_SIZE_BUFFER_SIZE) {
        flush();
      } else {
        if ((recordSize >= 0) && (recordSize != length)) {
          if (recordSizeBufferPos
              > (2 * (Constants.MAX_BLOCK_HEADER_SIZE + Constants.BLOCK_FOOTER_SIZE))) {
            flush();
          }
        }
      }
    }

    recordSizeBufferPos += Varint.encode(length, recordSizeBuffer, recordSizeBufferPos);
    ++recordCount;
    if ((recordBufferPos + length) >= Constants.RECORD_BUFFER_SIZE) {
      flushFromExternalBuffer(buffer, offset, length);
    } else {
      System.arraycopy(buffer, offset, recordBuffer, recordBufferPos, length);
      recordBufferPos += length;
      if (recordSize == RECORD_SIZE_INIT) {
        recordSize = length;
      } else if (recordSize != length) {
        recordSize = RECORD_SIZE_DIFFERENT;
      }
    }
    return true;
  }
Ejemplo n.º 3
0
 protected void writeVarint(int value, boolean updateChecksum) throws IOException {
   int length = Varint.encode(value, tmpBuffer, 0);
   writeToStream(tmpBuffer, 0, length, updateChecksum);
 }