Package org.apache.cassandra.utils

Class NativeLibrary

  • public final class NativeLibrary
extends java.lang.Object

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static class  NativeLibrary.OSType  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int getfd​(java.io.FileDescriptor descriptor)
      Get system file descriptor from FileDescriptor object.
      static int getfd​(java.nio.channels.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​(java.lang.String path)  
      static void trySkipCache​(int fd, long offset, int len, java.lang.String path)  
      static void trySkipCache​(int fd, long offset, long len, java.lang.String path)  
      static void trySkipCache​(java.lang.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

    • Method Detail

      • 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​(java.lang.String path,
                                long offset,
                                long len)

      • trySkipCache

        public static void trySkipCache​(int fd,
                                long offset,
                                long len,
                                java.lang.String path)

      • trySkipCache

        public static void trySkipCache​(int fd,
                                long offset,
                                int len,
                                java.lang.String path)

      • tryFcntl

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

      • tryOpenDirectory

        public static int tryOpenDirectory​(java.lang.String path)

      • trySync

        public static void trySync​(int fd)

      • tryCloseFD

        public static void tryCloseFD​(int fd)

      • getfd

        public static int getfd​(java.nio.channels.FileChannel channel)

      • getfd

        public static int getfd​(java.io.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