Package com.yahoo.io

Class NativeIO

java.lang.Object

com.yahoo.io.NativeIO

public class NativeIO
extends Object

Provides functionality only possible through native C library.

Constructor Summary

Constructors

Constructor	Description
NativeIO()

Method Summary

Modifier and Type	Method	Description
void	dropFileFromCache(File file)	Will hint the OS that this is will not be accessed again and should hence be dropped from the buffer cache.
void	dropFileFromCache(FileDescriptor fd)	Will hint the OS that this is will not be accessed again and should hence be dropped from the buffer cache.
void	dropPartialFileFromCache(FileDescriptor fd, long offset, long len, boolean sync)	Will hint the OS that data read so far will not be accessed again and should hence be dropped from the buffer cache.
final Throwable	getError()
boolean	valid()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NativeIO

public NativeIO()

Method Details

valid

public boolean valid()

getError

public final Throwable getError()

dropPartialFileFromCache

public void dropPartialFileFromCache(FileDescriptor fd,
 long offset,
 long len,
 boolean sync)

Will hint the OS that data read so far will not be accessed again and should hence be dropped from the buffer cache.

Parameters:

fd - The file descriptor to drop from buffer cache.

dropFileFromCache

public void dropFileFromCache(FileDescriptor fd)

Will hint the OS that this is will not be accessed again and should hence be dropped from the buffer cache.

Parameters:

fd - The file descriptor to drop from buffer cache.

dropFileFromCache

public void dropFileFromCache(File file)

Will hint the OS that this is will not be accessed again and should hence be dropped from the buffer cache.

Parameters:

file - File to drop from buffer cache