org.apache.hadoop.io.nativeio

类 NativeIO

java.lang.Object

org.apache.hadoop.io.nativeio.NativeIO

public class NativeIO
extends Object

JNI wrappers for various native IO-related calls not available in Java. These functions should generally be used alongside a fallback to another more portable mechanism.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	NativeIO.Stat Result type of the fstat call

字段概要

字段

限定符和类型	字段和说明
static int	O_APPEND
static int	O_ASYNC
static int	O_CREAT
static int	O_EXCL
static int	O_FSYNC
static int	O_NDELAY
static int	O_NOCTTY
static int	O_NONBLOCK
static int	O_RDONLY
static int	O_RDWR
static int	O_SYNC
static int	O_TRUNC
static int	O_WRONLY
static int	POSIX_FADV_DONTNEED
static int	POSIX_FADV_NOREUSE
static int	POSIX_FADV_NORMAL
static int	POSIX_FADV_RANDOM
static int	POSIX_FADV_SEQUENTIAL
static int	POSIX_FADV_WILLNEED
static int	SYNC_FILE_RANGE_WAIT_AFTER
static int	SYNC_FILE_RANGE_WAIT_BEFORE
static int	SYNC_FILE_RANGE_WRITE

构造器概要

构造器

构造器和说明
NativeIO()

方法概要

方法

限定符和类型	方法和说明
static void	chmod(String path, int mode) Wrapper around chmod(2)
static NativeIO.Stat	fstat(FileDescriptor fd) Wrapper around fstat(2)
static String	getOwner(FileDescriptor fd)
static boolean	isAvailable() Return true if the JNI-based native IO extensions are available.
static FileDescriptor	open(String path, int flags, int mode) Wrapper around open(2)
static void	posixFadviseIfPossible(FileDescriptor fd, long offset, long len, int flags) Call posix_fadvise on the given file descriptor.
static void	syncFileRangeIfPossible(FileDescriptor fd, long offset, long nbytes, int flags) Call sync_file_range on the given file descriptor.

从类继承的方法 java.lang.Object

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

字段详细资料

O_RDONLY

public static final int O_RDONLY

另请参阅:

常量字段值

O_WRONLY

public static final int O_WRONLY

另请参阅:

常量字段值

O_RDWR

public static final int O_RDWR

另请参阅:

常量字段值

O_CREAT

public static final int O_CREAT

另请参阅:

常量字段值

O_EXCL

public static final int O_EXCL

另请参阅:

常量字段值

O_NOCTTY

public static final int O_NOCTTY

另请参阅:

常量字段值

O_TRUNC

public static final int O_TRUNC

另请参阅:

常量字段值

O_APPEND

public static final int O_APPEND

另请参阅:

常量字段值

O_NONBLOCK

public static final int O_NONBLOCK

另请参阅:

常量字段值

O_SYNC

public static final int O_SYNC

另请参阅:

常量字段值

O_ASYNC

public static final int O_ASYNC

另请参阅:

常量字段值

O_FSYNC

public static final int O_FSYNC

另请参阅:

常量字段值

O_NDELAY

public static final int O_NDELAY

另请参阅:

常量字段值

POSIX_FADV_NORMAL

public static final int POSIX_FADV_NORMAL

另请参阅:

常量字段值

POSIX_FADV_RANDOM

public static final int POSIX_FADV_RANDOM

另请参阅:

常量字段值

POSIX_FADV_SEQUENTIAL

public static final int POSIX_FADV_SEQUENTIAL

另请参阅:

常量字段值

POSIX_FADV_WILLNEED

public static final int POSIX_FADV_WILLNEED

另请参阅:

常量字段值

POSIX_FADV_DONTNEED

public static final int POSIX_FADV_DONTNEED

另请参阅:

常量字段值

POSIX_FADV_NOREUSE

public static final int POSIX_FADV_NOREUSE

另请参阅:

常量字段值

SYNC_FILE_RANGE_WAIT_BEFORE

public static final int SYNC_FILE_RANGE_WAIT_BEFORE

另请参阅:

常量字段值

SYNC_FILE_RANGE_WRITE

public static final int SYNC_FILE_RANGE_WRITE

另请参阅:

常量字段值

SYNC_FILE_RANGE_WAIT_AFTER

public static final int SYNC_FILE_RANGE_WAIT_AFTER

另请参阅:

常量字段值

构造器详细资料

NativeIO

public NativeIO()

方法详细资料

isAvailable

public static boolean isAvailable()

Return true if the JNI-based native IO extensions are available.

open

public static FileDescriptor open(String path,
                  int flags,
                  int mode)
                           throws IOException

Wrapper around open(2)

抛出:

IOException

fstat

public static NativeIO.Stat fstat(FileDescriptor fd)
                           throws IOException

Wrapper around fstat(2)

抛出:

IOException

chmod

public static void chmod(String path,
         int mode)
                  throws IOException

Wrapper around chmod(2)

抛出:

IOException

posixFadviseIfPossible

public static void posixFadviseIfPossible(FileDescriptor fd,
                          long offset,
                          long len,
                          int flags)
                                   throws NativeIOException

Call posix_fadvise on the given file descriptor. See the manpage for this syscall for more information. On systems where this call is not available, does nothing.

抛出:

NativeIOException - if there is an error with the syscall

syncFileRangeIfPossible

public static void syncFileRangeIfPossible(FileDescriptor fd,
                           long offset,
                           long nbytes,
                           int flags)
                                    throws NativeIOException

Call sync_file_range on the given file descriptor. See the manpage for this syscall for more information. On systems where this call is not available, does nothing.

抛出:

NativeIOException - if there is an error with the syscall

getOwner

public static String getOwner(FileDescriptor fd)
                       throws IOException

抛出:

IOException