org.apache.cassandra.io.util

Class MappedFileDataInput

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.AbstractDataInput

org.apache.cassandra.io.util.MappedFileDataInput

All Implemented Interfaces:

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

public class MappedFileDataInput
extends AbstractDataInput
implements FileDataInput

Constructor Summary

Constructors

Constructor and Description
MappedFileDataInput(java.io.FileInputStream stream, java.lang.String filename, long segmentOffset, int position)
MappedFileDataInput(java.nio.MappedByteBuffer buffer, java.lang.String filename, long segmentOffset, int position)

Method Summary

Methods

Modifier and Type	Method and Description
long	bytesPastMark(FileMark mark)
long	bytesRemaining()
long	getFilePointer()
java.lang.String	getPath()
protected int	getPosition()
boolean	isEOF()
FileMark	mark()
boolean	markSupported()
int	read()
java.nio.ByteBuffer	readBytes(int length) Does the same thing as readFully do but without copying data (thread safe)
void	readFully(byte[] buffer) Reads bytes from this file into buffer.
void	readFully(byte[] buffer, int offset, int count) Read bytes from this file into buffer starting at offset offset.
void	reset(FileMark mark)
void	seek(long pos)
protected void	seekInternal(int pos)
int	skipBytes(int n)
java.lang.String	toString()

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

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

Methods inherited from class java.io.InputStream

available, close, mark, read, read, reset, 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, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF

Methods inherited from interface java.io.Closeable

close

Constructor Detail

MappedFileDataInput

public MappedFileDataInput(java.io.FileInputStream stream,
                   java.lang.String filename,
                   long segmentOffset,
                   int position)
                    throws java.io.IOException

Throws:

java.io.IOException

MappedFileDataInput

public MappedFileDataInput(java.nio.MappedByteBuffer buffer,
                   java.lang.String filename,
                   long segmentOffset,
                   int position)

Method Detail

seekInternal

protected void seekInternal(int pos)

Specified by:

seekInternal in class AbstractDataInput

seek

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

Specified by:

seek in interface FileDataInput

Throws:

java.io.IOException

getFilePointer

public long getFilePointer()

Specified by:

getFilePointer in interface FileDataInput

getPosition

protected int getPosition()

Specified by:

getPosition in class AbstractDataInput

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.InputStream

reset

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

Specified by:

reset in interface FileDataInput

Throws:

java.io.IOException

mark

public FileMark mark()

Specified by:

mark in interface FileDataInput

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

Throws:

java.io.IOException

bytesRemaining

public long bytesRemaining()
                    throws java.io.IOException

Specified by:

bytesRemaining in interface FileDataInput

Throws:

java.io.IOException

getPath

public java.lang.String getPath()

Specified by:

getPath in interface FileDataInput

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

readBytes

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

Does the same thing as readFully do but without copying data (thread safe)

Specified by:

readBytes in interface FileDataInput

Parameters:

length - length of the bytes to read

Returns:

buffer with portion of file content

Throws:

java.io.IOException - on any fail of I/O operation

readFully

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

Description copied from class: AbstractDataInput

Reads bytes from this file into buffer. Blocks until buffer.length number of bytes have been read, the end of the file is reached or an exception is thrown.

Specified by:

readFully in interface java.io.DataInput

Overrides:

readFully in class AbstractDataInput

Parameters:

buffer - the buffer to read bytes into.

Throws:

java.io.EOFException - if the end of this file is detected.

java.io.IOException - if this file is closed or another I/O error occurs.

readFully

public final void readFully(byte[] buffer,
             int offset,
             int count)
                     throws java.io.IOException

Description copied from class: AbstractDataInput

Read bytes from this file into buffer starting at offset offset. This method blocks until count number of bytes have been read.

Specified by:

readFully in interface java.io.DataInput

Overrides:

readFully in class AbstractDataInput

Parameters:

buffer - the buffer to read bytes into.

offset - the initial position in buffer to store the bytes read from this file.

count - the maximum number of bytes to store in buffer.

Throws:

java.io.EOFException - if the end of this file is detected.

java.io.IOException - if this file is closed or another I/O error occurs.

skipBytes

public int skipBytes(int n)
              throws java.io.IOException

Specified by:

skipBytes in interface java.io.DataInput

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object