Package org.apache.cassandra.utils

Class NativeLibrary

java.lang.Object

org.apache.cassandra.utils.NativeLibrary

public final class NativeLibrary
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	NativeLibrary.OSType

Field Summary

Fields

Modifier and Type	Field	Description
static final NativeLibrary.OSType	osType

Method Summary

Modifier and Type	Method	Description
static int	getfd(FileDescriptor descriptor)	Get system file descriptor from FileDescriptor object.
static int	getfd(FileChannel channel)
static long	getProcessID()
static boolean	isAvailable()	Checks if the library has been successfully linked.
static boolean	jnaMemoryLockable()
static void	tryCloseFD(int fd)
static int	tryFcntl(int fd, int command, int flags)
static void	tryMlockall()
static int	tryOpenDirectory(String path)
static void	trySkipCache(int fd, long offset, int len, String path)
static void	trySkipCache(int fd, long offset, long len, String path)
static void	trySkipCache(String path, long offset, long len)
static void	trySync(int fd)

Methods inherited from class java.lang.Object

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

Field Details

osType

public static final NativeLibrary.OSType osType

Method Details

isAvailable

public static boolean isAvailable()

Checks if the library has been successfully linked.

Returns:

true if the library has been successfully linked, false otherwise.

jnaMemoryLockable

public static boolean jnaMemoryLockable()

tryMlockall

public static void tryMlockall()

trySkipCache

public static void trySkipCache(String path,
 long offset,
 long len)

trySkipCache

public static void trySkipCache(int fd,
 long offset,
 long len,
 String path)

trySkipCache

public static void trySkipCache(int fd,
 long offset,
 int len,
 String path)

tryFcntl

public static int tryFcntl(int fd,
 int command,
 int flags)

tryOpenDirectory

public static int tryOpenDirectory(String path)

trySync

public static void trySync(int fd)

tryCloseFD

public static void tryCloseFD(int fd)

getfd

public static int getfd(FileChannel channel)

getfd

public static int getfd(FileDescriptor descriptor)

Get system file descriptor from FileDescriptor object.

Parameters:

descriptor - - FileDescriptor objec to get fd from

Returns:

file descriptor, -1 or error

getProcessID

public static long getProcessID()

Returns:

the PID of the JVM or -1 if we failed to get the PID