org.apache.cassandra.io.util

Class RandomAccessReader

java.lang.Object

java.io.RandomAccessFile

org.apache.cassandra.io.util.RandomAccessReader

All Implemented Interfaces:

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

Direct Known Subclasses:

CompressedRandomAccessReader, ThrottledReader

public class RandomAccessReader
extends java.io.RandomAccessFile
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 byte[]	buffer
protected long	bufferOffset
static long	CACHE_FLUSH_INTERVAL_IN_BYTES
protected java.nio.channels.FileChannel	channel
protected long	current
static int	DEFAULT_BUFFER_SIZE
protected long	markedPointer
protected PoolingSegmentedFile	owner
protected int	validBufferBytes

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RandomAccessReader(java.io.File file, int bufferSize, PoolingSegmentedFile owner)

Method Summary

Methods

Modifier and Type	Method and Description
protected int	bufferCursor()
long	bytesPastMark()
long	bytesPastMark(FileMark mark)
long	bytesRemaining()
void	close()
void	deallocate()
long	getFilePointer()
java.lang.String	getPath()
int	getTotalBufferSize()
boolean	isEOF()
long	length()
FileMark	mark()
static RandomAccessReader	open(java.io.File file)
static RandomAccessReader	open(java.io.File file, PoolingSegmentedFile owner)
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)
protected void	resetBuffer()
void	seek(long newPosition)
java.lang.String	toString()
void	write(byte[] buffer)
void	write(byte[] buffer, int offset, int length)
void	write(int value)

Methods inherited from class java.io.RandomAccessFile

getChannel, getFD, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, setLength, skipBytes, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

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

CACHE_FLUSH_INTERVAL_IN_BYTES

public static final long CACHE_FLUSH_INTERVAL_IN_BYTES

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

buffer

protected byte[] buffer

bufferOffset

protected long bufferOffset

current

protected long current

markedPointer

protected long markedPointer

validBufferBytes

protected int validBufferBytes

channel

protected final java.nio.channels.FileChannel channel

owner

protected final PoolingSegmentedFile owner

Constructor Detail

RandomAccessReader

protected RandomAccessReader(java.io.File file,
                  int bufferSize,
                  PoolingSegmentedFile owner)
                      throws java.io.FileNotFoundException

Throws:

java.io.FileNotFoundException

Method Detail

open

public static RandomAccessReader open(java.io.File file,
                      PoolingSegmentedFile owner)

open

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

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

Overrides:

getFilePointer in class java.io.RandomAccessFile

getPath

public java.lang.String getPath()

Specified by:

getPath in interface FileDataInput

getTotalBufferSize

public int getTotalBufferSize()

reset

public void reset()

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

bufferCursor

protected int bufferCursor()

resetBuffer

protected void resetBuffer()

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.RandomAccessFile

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

Overrides:

seek in class java.io.RandomAccessFile

read

public int read()

Overrides:

read in class java.io.RandomAccessFile

read

public int read(byte[] buffer)

Overrides:

read in class java.io.RandomAccessFile

read

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

Overrides:

read in class java.io.RandomAccessFile

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()

Overrides:

length in class java.io.RandomAccessFile

write

public void write(int value)

Specified by:

write in interface java.io.DataOutput

Overrides:

write in class java.io.RandomAccessFile

write

public void write(byte[] buffer)

Specified by:

write in interface java.io.DataOutput

Overrides:

write in class java.io.RandomAccessFile

write

public void write(byte[] buffer,
         int offset,
         int length)

Specified by:

write in interface java.io.DataOutput

Overrides:

write in class java.io.RandomAccessFile