org.apache.flink.runtime.io.compression

接口 BlockCompressor

所有已知实现类:

Lz4BlockCompressor

public interface BlockCompressor

A compressor which compresses a whole byte array each time. It will read from and write to byte arrays given from the outside, reducing copy time.

方法概要

限定符和类型	方法和说明
int	compress(byte[] src, int srcOff, int srcLen, byte[] dst, int dstOff) Compress data read from src, and write the compressed data to dst.
int	compress(ByteBuffer src, int srcOff, int srcLen, ByteBuffer dst, int dstOff) Compress source data read from (Buffer.position() + srcOff), and write the compressed data to dst.
int	getMaxCompressedSize(int srcSize) Get the max compressed size for a given original size.

方法详细资料

getMaxCompressedSize

int getMaxCompressedSize(int srcSize)

Get the max compressed size for a given original size.

compress

int compress(ByteBuffer src,
             int srcOff,
             int srcLen,
             ByteBuffer dst,
             int dstOff)
      throws InsufficientBufferException

Compress source data read from (Buffer.position() + srcOff), and write the compressed data to dst.

参数:

src - Uncompressed data to read from

srcOff - The start offset of uncompressed data

srcLen - The length of data which want to be compressed

dst - The target to write compressed data

dstOff - The start offset to write the compressed data

返回:

Length of compressed data

抛出:

InsufficientBufferException - if the target does not have sufficient space

compress

int compress(byte[] src,
             int srcOff,
             int srcLen,
             byte[] dst,
             int dstOff)
      throws InsufficientBufferException

Compress data read from src, and write the compressed data to dst.

参数:

src - Uncompressed data to read from

srcOff - The start offset of uncompressed data

srcLen - The length of data which want to be compressed

dst - The target to write compressed data

dstOff - The start offset to write the compressed data

返回:

Length of compressed data

抛出:

InsufficientBufferException - if the target does not have sufficient space