org.apache.cassandra.io.compress

Class CompressedRandomAccessReader

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.AbstractDataInput

org.apache.cassandra.io.util.RandomAccessReader

org.apache.cassandra.io.compress.CompressedRandomAccessReader

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.lang.AutoCloseable, DataInputPlus, FileDataInput

Direct Known Subclasses:

CompressedThrottledReader

public class CompressedRandomAccessReader
extends RandomAccessReader

CRAR extends RAR to transparently uncompress blocks from the file into RAR.buffer. Most of the RAR "read bytes from the buffer, rebuffering when necessary" machinery works unchanged after that.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.io.util.RandomAccessReader

RandomAccessReader.BufferedRandomAccessFileMark

Nested classes/interfaces inherited from interface org.apache.cassandra.io.util.DataInputPlus

DataInputPlus.DataInputStreamPlus

Field Summary

Fields inherited from class org.apache.cassandra.io.util.RandomAccessReader

buffer, bufferOffset, channel, DEFAULT_BUFFER_SIZE, markedPointer

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CompressedRandomAccessReader(ChannelProxy channel, CompressionMetadata metadata, ICompressedFile file)

Method Summary

Modifier and Type	Method and Description
void	close()
protected int	getBufferSize(int size) The buffer size is typically already page aligned but if that is not the case make sure that it is a multiple of the page size, 4096.
int	getTotalBufferSize()
long	length()
static CompressedRandomAccessReader	open(ChannelProxy channel, CompressionMetadata metadata)
static CompressedRandomAccessReader	open(ICompressedFile file)
protected void	reBuffer() Read data from file starting from current currentOffset to populate buffer.
java.lang.String	toString()

Methods inherited from class org.apache.cassandra.io.util.RandomAccessReader

allocateBuffer, bytesPastMark, bytesPastMark, bytesRemaining, current, getChannel, getFilePointer, getPath, getPosition, getPositionLimit, isEOF, mark, open, open, open, read, read, read, readBytes, reset, reset, seek

Methods inherited from class org.apache.cassandra.io.util.AbstractDataInput

readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

Methods inherited from class java.io.InputStream

available, mark, markSupported, skip

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.DataInputPlus

readUnsignedVInt, readVInt

Methods inherited from interface java.io.DataInput

readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

Constructor Detail

CompressedRandomAccessReader

protected CompressedRandomAccessReader(ChannelProxy channel,
                                       CompressionMetadata metadata,
                                       ICompressedFile file)

Method Detail

open

public static CompressedRandomAccessReader open(ChannelProxy channel,
                                                CompressionMetadata metadata)

open

public static CompressedRandomAccessReader open(ICompressedFile file)

getBufferSize

protected int getBufferSize(int size)

Description copied from class: RandomAccessReader

The buffer size is typically already page aligned but if that is not the case make sure that it is a multiple of the page size, 4096.

Overrides:

getBufferSize in class RandomAccessReader

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class RandomAccessReader

reBuffer

protected void reBuffer()

Description copied from class: RandomAccessReader

Read data from file starting from current currentOffset to populate buffer.

Overrides:

reBuffer in class RandomAccessReader

getTotalBufferSize

public int getTotalBufferSize()

Overrides:

getTotalBufferSize in class RandomAccessReader

length

public long length()

Overrides:

length in class RandomAccessReader

toString

public java.lang.String toString()

Overrides:

toString in class RandomAccessReader