org.apache.hadoop.hbase.util

Class UnsafeAccess

java.lang.Object

org.apache.hadoop.hbase.util.UnsafeAccess

@InterfaceAudience.Private
 @InterfaceStability.Evolving
public final class UnsafeAccess
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	BYTE_ARRAY_BASE_OFFSET The offset to the first element in a byte array.
static sun.misc.Unsafe	theUnsafe

Method Summary

Modifier and Type	Method and Description
static void	copy(byte[] src, int srcOffset, java.nio.ByteBuffer dest, int destOffset, int length) Copies the bytes from given array's offset to length part into the given buffer.
static void	copy(java.nio.ByteBuffer src, int srcOffset, byte[] dest, int destOffset, int length) Copies specified number of bytes from given offset of src ByteBuffer to the dest array.
static void	copy(java.nio.ByteBuffer src, int srcOffset, java.nio.ByteBuffer dest, int destOffset, int length) Copies specified number of bytes from given offset of src buffer into the dest buffer.
static boolean	isAvailable()
static boolean	unaligned()

Methods inherited from class java.lang.Object

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

Field Detail

theUnsafe

public static final sun.misc.Unsafe theUnsafe

BYTE_ARRAY_BASE_OFFSET

public static final int BYTE_ARRAY_BASE_OFFSET

The offset to the first element in a byte array.

Method Detail

isAvailable

public static boolean isAvailable()

unaligned

public static boolean unaligned()

Returns:

true when running JVM is having sun's Unsafe package available in it and underlying system having unaligned-access capability.

copy

public static void copy(byte[] src,
                        int srcOffset,
                        java.nio.ByteBuffer dest,
                        int destOffset,
                        int length)

Copies the bytes from given array's offset to length part into the given buffer.

Parameters:

src -

srcOffset -

dest -

destOffset -

length -

copy

public static void copy(java.nio.ByteBuffer src,
                        int srcOffset,
                        byte[] dest,
                        int destOffset,
                        int length)

Copies specified number of bytes from given offset of src ByteBuffer to the dest array.

Parameters:

src -

srcOffset -

dest -

destOffset -

length -

copy

public static void copy(java.nio.ByteBuffer src,
                        int srcOffset,
                        java.nio.ByteBuffer dest,
                        int destOffset,
                        int length)

Copies specified number of bytes from given offset of src buffer into the dest buffer.

Parameters:

src -

srcOffset -

dest -

destOffset -

length -