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, FileDataInput

Direct Known Subclasses:

CompressedRandomAccessReader

public class RandomAccessReader
extends java.io.RandomAccessFile
implements FileDataInput

Nested Class Summary

protected static class

RandomAccessReader.BufferedRandomAccessFileMark Class to hold a mark to the position of the file

Field Summary

protected byte[]	buffer
protected long	bufferOffset
protected java.nio.channels.FileChannel	channel
protected long	current
static int	DEFAULT_BUFFER_SIZE
protected long	markedPointer
static long	MAX_BYTES_IN_PAGE_CACHE
protected int	validBufferBytes

Constructor Summary

RandomAccessReader(java.io.File file, int bufferSize, boolean skipIOCache)

Method Summary

protected int	bufferCursor()
long	bytesPastMark()
long	bytesPastMark(FileMark mark)
long	bytesRemaining()
void	close()
long	getFilePointer()
java.lang.String	getPath()
boolean	isEOF()
long	length()
FileMark	mark()
static RandomAccessReader	open(java.io.File file)
static RandomAccessReader	open(java.io.File file, boolean skipIOCache)
static RandomAccessReader	open(java.io.File file, int bufferSize)
static RandomAccessReader	open(java.io.File file, int bufferSize, boolean skipIOCache)
static RandomAccessReader	open(SequentialWriter writer)
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

MAX_BYTES_IN_PAGE_CACHE

public static final long MAX_BYTES_IN_PAGE_CACHE

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

Constructor Detail

RandomAccessReader

public RandomAccessReader(java.io.File file,
                          int bufferSize,
                          boolean skipIOCache)
                   throws java.io.IOException

Throws:

java.io.IOException

Method Detail

open

public static RandomAccessReader open(java.io.File file,
                                      boolean skipIOCache)
                               throws java.io.IOException

Throws:

java.io.IOException

open

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

Throws:

java.io.IOException

open

public static RandomAccessReader open(java.io.File file,
                                      int bufferSize)
                               throws java.io.IOException

Throws:

java.io.IOException

open

public static RandomAccessReader open(java.io.File file,
                                      int bufferSize,
                                      boolean skipIOCache)
                               throws java.io.IOException

Throws:

java.io.IOException

open

public static RandomAccessReader open(SequentialWriter writer)
                               throws java.io.IOException

Throws:

java.io.IOException

reBuffer

protected void reBuffer()
                 throws java.io.IOException

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

Throws:

java.io.IOException - on any I/O error.

getFilePointer

public long getFilePointer()

Overrides:

getFilePointer in class java.io.RandomAccessFile

getPath

public java.lang.String getPath()

Specified by:

getPath in interface FileDataInput

reset

public void reset()
           throws java.io.IOException

Throws:

java.io.IOException

bytesPastMark

public long bytesPastMark()

mark

public FileMark mark()

Specified by:

mark in interface FileDataInput

reset

public void reset(FileMark mark)
           throws java.io.IOException

Specified by:

reset in interface FileDataInput

Throws:

java.io.IOException

bytesPastMark

public long bytesPastMark(FileMark mark)

Specified by:

bytesPastMark in interface FileDataInput

isEOF

public boolean isEOF()
              throws java.io.IOException

Specified by:

isEOF in interface FileDataInput

Returns:

true if there is no more data to read

Throws:

java.io.IOException - on any I/O error.

bytesRemaining

public long bytesRemaining()
                    throws java.io.IOException

Specified by:

bytesRemaining in interface FileDataInput

Throws:

java.io.IOException

bufferCursor

protected int bufferCursor()

resetBuffer

protected void resetBuffer()

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.RandomAccessFile

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

seek

public void seek(long newPosition)
          throws java.io.IOException

Overrides:

seek in class java.io.RandomAccessFile

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Overrides:

read in class java.io.RandomAccessFile

Throws:

java.io.IOException

read

public int read(byte[] buffer)
         throws java.io.IOException

Overrides:

read in class java.io.RandomAccessFile

Throws:

java.io.IOException

read

public int read(byte[] buff,
                int offset,
                int length)
         throws java.io.IOException

Overrides:

read in class java.io.RandomAccessFile

Throws:

java.io.IOException

readBytes

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

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.IOException - if any I/O operation failed

length

public long length()
            throws java.io.IOException

Overrides:

length in class java.io.RandomAccessFile

Throws:

java.io.IOException

write

public void write(int value)
           throws java.io.IOException

Specified by:

write in interface java.io.DataOutput

Overrides:

write in class java.io.RandomAccessFile

Throws:

java.io.IOException

write

public void write(byte[] buffer)
           throws java.io.IOException

Specified by:

write in interface java.io.DataOutput

Overrides:

write in class java.io.RandomAccessFile

Throws:

java.io.IOException

write

public void write(byte[] buffer,
                  int offset,
                  int length)
           throws java.io.IOException

Specified by:

write in interface java.io.DataOutput

Overrides:

write in class java.io.RandomAccessFile

Throws:

java.io.IOException