CompressedChunkReader.Mmap (apache-cassandra API)

java.lang.Object
- org.apache.cassandra.io.util.AbstractReaderFileProxy
- - org.apache.cassandra.io.util.CompressedChunkReader
  - - org.apache.cassandra.io.util.CompressedChunkReader.Mmap

All Implemented Interfaces:

java.lang.AutoCloseable, ChunkReader, ReaderFileProxy, RebuffererFactory

Enclosing class:

CompressedChunkReader
```
public static class CompressedChunkReader.Mmap
extends CompressedChunkReader
```

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.cassandra.io.util.CompressedChunkReader
  CompressedChunkReader.Mmap, CompressedChunkReader.Standard

Field Summary

Fields
Modifier and Type Field Description

protected MmappedRegions regions
- Fields inherited from class org.apache.cassandra.io.util.AbstractReaderFileProxy
  channel, fileLength

Constructor Summary

Constructors
Constructor	Description
`Mmap(ChannelProxy channel, CompressionMetadata metadata, MmappedRegions regions, java.util.function.Supplier<java.lang.Double> crcCheckChanceSupplier)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`
`void`	`readChunk(long position, java.nio.ByteBuffer uncompressed)`	Read the chunk at the given position, attempting to fill the capacity of the given buffer.

Methods inherited from class org.apache.cassandra.io.util.CompressedChunkReader
chunkSize, getCrcCheckChance, instantiateRebufferer, preferredBufferType, toString

Methods inherited from class org.apache.cassandra.io.util.AbstractReaderFileProxy
channel, fileLength

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.cassandra.io.util.ReaderFileProxy
channel, fileLength

- Field Detail
  - regions
```
protected final MmappedRegions regions
```
- Constructor Detail
  - Mmap
```
public Mmap(ChannelProxy channel,
            CompressionMetadata metadata,
            MmappedRegions regions,
            java.util.function.Supplier<java.lang.Double> crcCheckChanceSupplier)
```
- Method Detail
  - readChunk
```
public void readChunk(long position,
                      java.nio.ByteBuffer uncompressed)
```
    Description copied from interface: ChunkReader
    
    Read the chunk at the given position, attempting to fill the capacity of the given buffer. The filled buffer must be positioned at 0, with limit set at the size of the available data. The source may have requirements for the positioning and/or size of the buffer (e.g. chunk-aligned and chunk-sized). These must be satisfied by the caller.
  - close
```
public void close()
```
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Specified by:
    
    close in interface ReaderFileProxy
    
    Overrides:
    
    close in class AbstractReaderFileProxy