Package com.esotericsoftware.kryo.unsafe

Class UnsafeUtil

java.lang.Object

com.esotericsoftware.kryo.unsafe.UnsafeUtil

public class UnsafeUtil
extends Object

Utility methods for using Unsafe.

Not available on all JVMs. Util.unsafe can be checked before using this class.

Author:

Roman Levenstein

Field Summary

Fields

Modifier and Type	Field	Description
static long	booleanArrayBaseOffset
static long	byteArrayBaseOffset
static long	charArrayBaseOffset
static long	doubleArrayBaseOffset
static long	floatArrayBaseOffset
static long	intArrayBaseOffset
static long	longArrayBaseOffset
static long	shortArrayBaseOffset
static sun.misc.Unsafe	unsafe	The sun.misc.Unsafe instance, or null if Unsafe is unavailable.

Constructor Summary

Constructors

Constructor	Description
UnsafeUtil()

Method Summary

Modifier and Type	Method	Description
static void	dispose(ByteBuffer buffer)	Release a direct buffer immediately rather than waiting for GC.
static boolean	isNewDirectBufferAvailable()	Returns true if newDirectBuffer(long, int) can be called.
static ByteBuffer	newDirectBuffer(long address, int size)	Create a ByteBuffer that uses the specified off-heap memory address instead of allocating a new one.

Methods inherited from class java.lang.Object

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

Field Detail

unsafe

public static final sun.misc.Unsafe unsafe

The sun.misc.Unsafe instance, or null if Unsafe is unavailable.

byteArrayBaseOffset

public static final long byteArrayBaseOffset

floatArrayBaseOffset

public static final long floatArrayBaseOffset

doubleArrayBaseOffset

public static final long doubleArrayBaseOffset

intArrayBaseOffset

public static final long intArrayBaseOffset

longArrayBaseOffset

public static final long longArrayBaseOffset

shortArrayBaseOffset

public static final long shortArrayBaseOffset

charArrayBaseOffset

public static final long charArrayBaseOffset

booleanArrayBaseOffset

public static final long booleanArrayBaseOffset

Constructor Detail

UnsafeUtil

public UnsafeUtil()

Method Detail

newDirectBuffer

public static ByteBuffer newDirectBuffer(long address,
                                         int size)

Create a ByteBuffer that uses the specified off-heap memory address instead of allocating a new one.

Parameters:

address - Address of the memory region to be used for a ByteBuffer.

size - Size in bytes of the memory region.

Throws:

UnsupportedOperationException - if creating a ByteBuffer this way is not available.

isNewDirectBufferAvailable

public static boolean isNewDirectBufferAvailable()

Returns true if newDirectBuffer(long, int) can be called.

dispose

public static void dispose(ByteBuffer buffer)

Release a direct buffer immediately rather than waiting for GC.