org.apache.cassandra.io.compress

Interface ICompressor

All Known Implementing Classes:

DeflateCompressor, LZ4Compressor, NoopCompressor, SnappyCompressor, ZstdCompressor

public interface ICompressor

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ICompressor.Uses Ways that a particular instance of ICompressor should be used internally in Cassandra.

Method Summary

Modifier and Type	Method and Description
void	compress(java.nio.ByteBuffer input, java.nio.ByteBuffer output) Compression for ByteBuffers.
int	initialCompressedBufferLength(int chunkLength)
BufferType	preferredBufferType() Returns the preferred (most efficient) buffer type for this compressor.
default java.util.Set<ICompressor.Uses>	recommendedUses() Hints to Cassandra which uses this compressor is recommended for.
java.util.Set<java.lang.String>	supportedOptions()
boolean	supports(BufferType bufferType) Checks if the given buffer would be supported by the compressor.
int	uncompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset)
void	uncompress(java.nio.ByteBuffer input, java.nio.ByteBuffer output) Decompression for DirectByteBuffers.

Method Detail

initialCompressedBufferLength

int initialCompressedBufferLength(int chunkLength)

uncompress

int uncompress(byte[] input,
               int inputOffset,
               int inputLength,
               byte[] output,
               int outputOffset)
        throws java.io.IOException

Throws:

java.io.IOException

compress

void compress(java.nio.ByteBuffer input,
              java.nio.ByteBuffer output)
       throws java.io.IOException

Compression for ByteBuffers. The data between input.position() and input.limit() is compressed and placed into output starting from output.position(). Positions in both buffers are moved to reflect the bytes read and written. Limits are not changed.

Throws:

java.io.IOException

uncompress

void uncompress(java.nio.ByteBuffer input,
                java.nio.ByteBuffer output)
         throws java.io.IOException

Decompression for DirectByteBuffers. The data between input.position() and input.limit() is uncompressed and placed into output starting from output.position(). Positions in both buffers are moved to reflect the bytes read and written. Limits are not changed.

Throws:

java.io.IOException

preferredBufferType

BufferType preferredBufferType()

Returns the preferred (most efficient) buffer type for this compressor.

supports

boolean supports(BufferType bufferType)

Checks if the given buffer would be supported by the compressor. If a type is supported, the compressor must be able to use it in combination with all other supported types. Direct and memory-mapped buffers must be supported by all compressors.

supportedOptions

java.util.Set<java.lang.String> supportedOptions()

recommendedUses

default java.util.Set<ICompressor.Uses> recommendedUses()

Hints to Cassandra which uses this compressor is recommended for. For example a compression algorithm which gets good compression ratio may trade off too much compression speed to be useful in certain compression heavy use cases such as flushes or mutation hints. Note that Cassandra may ignore these recommendations, it is not a strict contract.