org.apache.druid.segment.data

Class CompressionStrategy.ZstdCompressor

java.lang.Object

org.apache.druid.segment.data.CompressionStrategy.Compressor

org.apache.druid.segment.data.CompressionStrategy.ZstdCompressor

Enclosing class:

CompressionStrategy

public static class CompressionStrategy.ZstdCompressor
extends CompressionStrategy.Compressor

Constructor Summary

Constructors

Constructor and Description
ZstdCompressor()

Method Summary

Modifier and Type	Method and Description
ByteBuffer	allocateInBuffer(int inputSize, Closer closer) Allocates a buffer that should be passed to CompressionStrategy.Compressor.compress(java.nio.ByteBuffer, java.nio.ByteBuffer) method as input buffer.
ByteBuffer	allocateOutBuffer(int inputSize, Closer closer) Allocates a buffer that should be passed to CompressionStrategy.Compressor.compress(java.nio.ByteBuffer, java.nio.ByteBuffer) method as output buffer.
ByteBuffer	compress(ByteBuffer in, ByteBuffer out) Returns a ByteBuffer with compressed contents of in between it's position and limit.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ZstdCompressor

public ZstdCompressor()

Method Detail

allocateInBuffer

public ByteBuffer allocateInBuffer(int inputSize,
                                   Closer closer)

Description copied from class: CompressionStrategy.Compressor

Allocates a buffer that should be passed to CompressionStrategy.Compressor.compress(java.nio.ByteBuffer, java.nio.ByteBuffer) method as input buffer. Different Compressors require (or work more efficiently with) different kinds of buffers.

If the allocated buffer is a direct buffer, it should be registered to be freed with the given Closer.

Overrides:

allocateInBuffer in class CompressionStrategy.Compressor

allocateOutBuffer

public ByteBuffer allocateOutBuffer(int inputSize,
                                    Closer closer)

Description copied from class: CompressionStrategy.Compressor

Allocates a buffer that should be passed to CompressionStrategy.Compressor.compress(java.nio.ByteBuffer, java.nio.ByteBuffer) method as output buffer. Different Compressors require (or work more efficiently with) different kinds of buffers.

Allocates a buffer that is always enough to compress a byte sequence of the given size.

If the allocated buffer is a direct buffer, it should be registered to be freed with the given Closer.

Specified by:

allocateOutBuffer in class CompressionStrategy.Compressor

compress

public ByteBuffer compress(ByteBuffer in,
                           ByteBuffer out)

Description copied from class: CompressionStrategy.Compressor

Returns a ByteBuffer with compressed contents of in between it's position and limit. It may be the provided out ByteBuffer, or the in ByteBuffer, depending on the implementation. out's position and limit are not respected and could be discarded.

Contents of in between it's position and limit are compressed. It's contents, position and limit shouldn't be changed in compress() method.

Specified by:

compress in class CompressionStrategy.Compressor