Package org.apache.cassandra.utils

Class NativeLibraryLinux

java.lang.Object

org.apache.cassandra.utils.NativeLibraryLinux

All Implemented Interfaces:

NativeLibraryWrapper

public class NativeLibraryLinux
extends Object
implements NativeLibraryWrapper

A NativeLibraryWrapper implementation for Linux.

When JNA is initialized, all methods that have the 'native' keyword will be attmpted to be linked against. As Java doesn't have the equivalent of a #ifdef, this means if a native method like posix_fadvise is defined in the class but not available on the target operating system (e.g. posix_fadvise is not availble on Darwin/Mac) this will cause the entire initial linking and initialization of JNA to fail. This means other native calls that are supported on that target operating system will be unavailable simply because of one native defined method not supported on the runtime operating system.

See Also:

• NativeLibraryWrapper
• NativeLibrary

Constructor Summary

Constructors

Constructor	Description
NativeLibraryLinux()

Method Summary

Modifier and Type	Method	Description
int	callClose(int fd)
int	callFcntl(int fd, int command, long flags)
int	callFsync(int fd)
long	callGetpid()
int	callMlockall(int flags)
int	callMunlockall()
int	callOpen(String path, int flags)
int	callPosixFadvise(int fd, long offset, int len, int flag)
com.sun.jna.Pointer	callStrerror(int errnum)
boolean	isAvailable()	Checks if the library has been successfully linked.

Methods inherited from class java.lang.Object

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

Constructor Details

NativeLibraryLinux

public NativeLibraryLinux()

Method Details

callMlockall

public int callMlockall(int flags)
                 throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callMlockall in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callMunlockall

public int callMunlockall()
                   throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callMunlockall in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callFcntl

public int callFcntl(int fd,
 int command,
 long flags)
              throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callFcntl in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callPosixFadvise

public int callPosixFadvise(int fd,
 long offset,
 int len,
 int flag)
                     throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callPosixFadvise in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callOpen

public int callOpen(String path,
 int flags)
             throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callOpen in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callFsync

public int callFsync(int fd)
              throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callFsync in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callClose

public int callClose(int fd)
              throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callClose in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callStrerror

public com.sun.jna.Pointer callStrerror(int errnum)
                                 throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callStrerror in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

callGetpid

public long callGetpid()
                throws UnsatisfiedLinkError,
RuntimeException

Specified by:

callGetpid in interface NativeLibraryWrapper

Throws:

UnsatisfiedLinkError

RuntimeException

isAvailable

public boolean isAvailable()

Description copied from interface: NativeLibraryWrapper

Checks if the library has been successfully linked.

Specified by:

isAvailable in interface NativeLibraryWrapper

Returns:

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