org.apache.cassandra.io.util

Class RandomAccessReader

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.AbstractDataInput

org.apache.cassandra.io.util.RandomAccessReader

All Implemented Interfaces:

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

Direct Known Subclasses:

ChecksummedRandomAccessReader, CompressedRandomAccessReader, ThrottledReader

public class RandomAccessReader
extends AbstractDataInput
implements FileDataInput

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	RandomAccessReader.BufferedRandomAccessFileMark Class to hold a mark to the position of the file

Field Summary

Fields

Modifier and Type	Field and Description
protected java.nio.ByteBuffer	buffer
static int	BUFFER_SIZE
protected long	bufferOffset
protected ChannelProxy	channel
static int	DEFAULT_BUFFER_SIZE
protected long	markedPointer
protected PoolingSegmentedFile	owner

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RandomAccessReader(ChannelProxy channel, int bufferSize, long overrideLength, BufferType bufferType, PoolingSegmentedFile owner)

Method Summary

Modifier and Type	Method and Description
protected java.nio.ByteBuffer	allocateBuffer(int bufferSize, BufferType bufferType)
long	bytesPastMark()
long	bytesPastMark(FileMark mark)
long	bytesRemaining()
void	close()
protected long	current()
void	deallocate()
ChannelProxy	getChannel()
long	getFilePointer()
java.lang.String	getPath()
long	getPosition()
long	getPositionLimit()
int	getTotalBufferSize()
boolean	isEOF()
long	length()
FileMark	mark()
static RandomAccessReader	open(ChannelProxy channel)
static RandomAccessReader	open(ChannelProxy channel, long overrideSize)
static RandomAccessReader	open(ChannelProxy channel, long overrideSize, PoolingSegmentedFile owner)
static RandomAccessReader	open(java.io.File file)
int	read()
int	read(byte[] buffer)
int	read(byte[] buff, int offset, int length)
java.nio.ByteBuffer	readBytes(int length) Read length bytes from current file position
protected void	reBuffer() Read data from file starting from current currentOffset to populate buffer.
void	reset()
void	reset(FileMark mark)
void	seek(long newPosition)
java.lang.String	toString()

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 java.io.DataInput

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

Field Detail

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

BUFFER_SIZE

public static final int BUFFER_SIZE

buffer

protected java.nio.ByteBuffer buffer

bufferOffset

protected long bufferOffset

markedPointer

protected long markedPointer

channel

protected final ChannelProxy channel

owner

protected final PoolingSegmentedFile owner

Constructor Detail

RandomAccessReader

protected RandomAccessReader(ChannelProxy channel,
                             int bufferSize,
                             long overrideLength,
                             BufferType bufferType,
                             PoolingSegmentedFile owner)

Method Detail

allocateBuffer

protected java.nio.ByteBuffer allocateBuffer(int bufferSize,
                                             BufferType bufferType)

open

public static RandomAccessReader open(ChannelProxy channel,
                                      long overrideSize,
                                      PoolingSegmentedFile owner)

open

public static RandomAccessReader open(java.io.File file)

open

public static RandomAccessReader open(ChannelProxy channel)

open

public static RandomAccessReader open(ChannelProxy channel,
                                      long overrideSize)

getChannel

public ChannelProxy getChannel()

reBuffer

protected void reBuffer()

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

getFilePointer

public long getFilePointer()

Specified by:

getFilePointer in interface FileDataInput

current

protected long current()

getPath

public java.lang.String getPath()

Specified by:

getPath in interface FileDataInput

getTotalBufferSize

public int getTotalBufferSize()

reset

public void reset()

Overrides:

reset in class java.io.InputStream

bytesPastMark

public long bytesPastMark()

mark

public FileMark mark()

Specified by:

mark in interface FileDataInput

reset

public void reset(FileMark mark)

Specified by:

reset in interface FileDataInput

bytesPastMark

public long bytesPastMark(FileMark mark)

Specified by:

bytesPastMark in interface FileDataInput

isEOF

public boolean isEOF()

Specified by:

isEOF in interface FileDataInput

Returns:

true if there is no more data to read

bytesRemaining

public long bytesRemaining()

Specified by:

bytesRemaining in interface FileDataInput

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

deallocate

public void deallocate()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

seek

public void seek(long newPosition)

Specified by:

seek in interface FileDataInput

Specified by:

seek in class AbstractDataInput

read

public int read()

Specified by:

read in class java.io.InputStream

read

public int read(byte[] buffer)

Overrides:

read in class java.io.InputStream

read

public int read(byte[] buff,
                int offset,
                int length)

Overrides:

read in class java.io.InputStream

readBytes

public java.nio.ByteBuffer readBytes(int length)
                              throws java.io.EOFException

Description copied from interface: FileDataInput

Read length bytes from current file position

Specified by:

readBytes in interface FileDataInput

Parameters:

length - length of the bytes to read

Returns:

buffer with bytes read

Throws:

java.io.EOFException

length

public long length()

getPosition

public long getPosition()

Specified by:

getPosition in class AbstractDataInput

getPositionLimit

public long getPositionLimit()

Specified by:

getPositionLimit in class AbstractDataInput