com.esotericsoftware.kryo.util

Class UnsafeUtil

java.lang.Object

com.esotericsoftware.kryo.util.UnsafeUtil

public class UnsafeUtil
extends Object

A few utility methods for using @link{sun.misc.Unsafe}, mostly for private use. Use of Unsafe on Android is forbidden, as Android provides only a very limited functionality for this class compared to the JDK version.

Author:

Roman Levenstein

Field Summary

Fields

Modifier and Type	Field and Description
static long	byteArrayBaseOffset
static long	charArrayBaseOffset
static long	doubleArrayBaseOffset
static long	floatArrayBaseOffset
static long	intArrayBaseOffset
static long	longArrayBaseOffset
static long	shortArrayBaseOffset

Constructor Summary

Constructors

Constructor and Description
UnsafeUtil()

Method Summary

Modifier and Type	Method and Description
static ByteBuffer	getDirectBufferAt(long address, int size) Create a ByteBuffer that uses a provided (off-heap) memory region instead of allocating a new one.
static void	releaseBuffer(ByteBuffer niobuffer) Release a direct buffer.
static Field[]	sortFieldsByOffset(List<Field> allFields) Sort the set of lists by their offsets from the object start address.
static sun.misc.Unsafe	unsafe() Return the sun.misc.Unsafe object.

Methods inherited from class java.lang.Object

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

Field Detail

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

Constructor Detail

UnsafeUtil

public UnsafeUtil()

Method Detail

unsafe

public static final sun.misc.Unsafe unsafe()

Return the sun.misc.Unsafe object. If null is returned, no further Unsafe-related methods are allowed to be invoked from UnsafeUtil.

Returns:

instance of sun.misc.Unsafe or null, if this class is not available or not accessible

sortFieldsByOffset

public static Field[] sortFieldsByOffset(List<Field> allFields)

Sort the set of lists by their offsets from the object start address.

Parameters:

allFields - set of fields to be sorted by their offsets

getDirectBufferAt

public static final ByteBuffer getDirectBufferAt(long address,
                                                 int size)

Create a ByteBuffer that uses a provided (off-heap) memory region instead of allocating a new one.

Parameters:

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

size - size of the memory region

Returns:

a new ByteBuffer that uses a provided memory region instead of allocating a new one

releaseBuffer

public static void releaseBuffer(ByteBuffer niobuffer)

Release a direct buffer. NOTE: If Cleaner is not accessible due to SecurityManager restrictions, reflection could be used to obtain the "clean" method and then invoke it.