Package org.apache.druid.segment.data
Class CompressionStrategy.Compressor
- java.lang.Object
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- org.apache.druid.segment.data.CompressionStrategy.Compressor
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- Direct Known Subclasses:
CompressionStrategy.LZ4Compressor
,CompressionStrategy.LZFCompressor
,CompressionStrategy.UncompressedCompressor
,CompressionStrategy.ZstdCompressor
- Enclosing class:
- CompressionStrategy
public abstract static class CompressionStrategy.Compressor extends Object
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Constructor Summary
Constructors Constructor Description Compressor()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description ByteBuffer
allocateInBuffer(int inputSize, Closer closer)
Allocates a buffer that should be passed tocompress(java.nio.ByteBuffer, java.nio.ByteBuffer)
method as input buffer.abstract ByteBuffer
allocateOutBuffer(int inputSize, Closer closer)
Allocates a buffer that should be passed tocompress(java.nio.ByteBuffer, java.nio.ByteBuffer)
method as output buffer.abstract ByteBuffer
compress(ByteBuffer in, ByteBuffer out)
Returns a ByteBuffer with compressed contents of in between it's position and limit.
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Method Detail
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allocateInBuffer
public ByteBuffer allocateInBuffer(int inputSize, Closer closer)
Allocates a buffer that should be passed tocompress(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.
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allocateOutBuffer
public abstract ByteBuffer allocateOutBuffer(int inputSize, Closer closer)
Allocates a buffer that should be passed tocompress(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.
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compress
public abstract ByteBuffer compress(ByteBuffer in, ByteBuffer out)
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.
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