org.apache.lucene.store

## Class NativePosixUtil

- java.lang.Object
- - org.apache.lucene.store.NativePosixUtil

-     public final class NativePosixUtil
      extends Object

  Provides JNI access to native methods such as madvise() for `NativeUnixDirectory`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `DONTNEED`
    `static int` | `NOREUSE`
    `static int` | `NORMAL`
    `static int` | `RANDOM`
    `static int` | `SEQUENTIAL`
    `static int` | `WILLNEED`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `NativePosixUtil()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static void` | `advise(FileDescriptor fd, long offset, long len, int advise)`
    `static int` | `madvise(ByteBuffer buf, int advise)`
    `static FileDescriptor` | `open_direct(String filename, boolean read)`
    `static int` | `posix_madvise(ByteBuffer buf, int advise)`
    `static long` | `pread(FileDescriptor fd, long pos, ByteBuffer byteBuf)`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### NORMAL

          public static final int NORMAL

      See Also:
        Constant Field Values

    - #### SEQUENTIAL

          public static final int SEQUENTIAL

      See Also:
        Constant Field Values

    - #### RANDOM

          public static final int RANDOM

      See Also:
        Constant Field Values

    - #### WILLNEED

          public static final int WILLNEED

      See Also:
        Constant Field Values

    - #### DONTNEED

          public static final int DONTNEED

      See Also:
        Constant Field Values

    - #### NOREUSE

          public static final int NOREUSE

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### NativePosixUtil

          public NativePosixUtil()

  - ### Method Detail

    - #### posix_madvise

          public static int posix_madvise(ByteBuffer buf,
                                          int advise)
                                   throws IOException

      Throws:
        `IOException`

    - #### madvise

          public static int madvise(ByteBuffer buf,
                                    int advise)
                             throws IOException

      Throws:
        `IOException`

    - #### open_direct

          public static FileDescriptor open_direct(String filename,
                                                   boolean read)
                                            throws IOException

      Throws:
        `IOException`

    - #### pread

          public static long pread(FileDescriptor fd,
                                   long pos,
                                   ByteBuffer byteBuf)
                            throws IOException

      Throws:
        `IOException`

    - #### advise

          public static void advise(FileDescriptor fd,
                                    long offset,
                                    long len,
                                    int advise)
                             throws IOException

      Throws:
        `IOException`

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