Package org.apache.bookkeeper.util

Class PageCacheUtil

java.lang.Object

org.apache.bookkeeper.util.PageCacheUtil

public final class PageCacheUtil
extends Object

Native I/O operations.

Method Summary

Modifier and Type	Method	Description
static void	bestEffortRemoveFromPageCache(int fd, long offset, long len)	Remove pages from the file system page cache when they won't be accessed again.
static int	getSysFileDescriptor(FileDescriptor descriptor)	Get system file descriptor (int) from FileDescriptor object.

Methods inherited from class java.lang.Object

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

Method Details

getSysFileDescriptor

public static int getSysFileDescriptor(FileDescriptor descriptor)

Get system file descriptor (int) from FileDescriptor object.

Parameters:

descriptor - - FileDescriptor object to get fd from

Returns:

file descriptor, -1 or error

bestEffortRemoveFromPageCache

public static void bestEffortRemoveFromPageCache(int fd,
 long offset,
 long len)

Remove pages from the file system page cache when they won't be accessed again.

Parameters:

fd - The file descriptor of the source file.

offset - The offset within the file.

len - The length to be flushed.