com.github.azbh111.utils.java.unsafe

类 UnsafeUtils

java.lang.Object

com.github.azbh111.utils.java.unsafe.UnsafeUtils

public class UnsafeUtils
extends java.lang.Object

封装Unsafe类,提供一些unsafe但又相对safe的操作

字段概要

字段

限定符和类型	字段和说明
static int	ADDRESS_SIZE
static int	addressSize
static long	ARRAY_BOOLEAN_BASE_OFFSET
static long	ARRAY_BOOLEAN_INDEX_SCALE 1
static long	ARRAY_BYTE_BASE_OFFSET
static long	ARRAY_BYTE_INDEX_SCALE
static long	ARRAY_CHAR_BASE_OFFSET
static long	ARRAY_CHAR_INDEX_SCALE
static long	ARRAY_DOUBLE_BASE_OFFSET
static long	ARRAY_DOUBLE_INDEX_SCALE
static long	ARRAY_FLOAT_BASE_OFFSET
static long	ARRAY_FLOAT_INDEX_SCALE
static long	ARRAY_INT_BASE_OFFSET
static long	ARRAY_INT_INDEX_SCALE
static long	ARRAY_LONG_BASE_OFFSET
static long	ARRAY_LONG_INDEX_SCALE
static long	ARRAY_OBJECT_BASE_OFFSET
static long	ARRAY_OBJECT_INDEX_SCALE
static long	ARRAY_SHORT_BASE_OFFSET
static long	ARRAY_SHORT_INDEX_SCALE

构造器概要

构造器

构造器和说明
UnsafeUtils()

方法概要

限定符和类型	方法和说明
static int	addressSize()
static <T> T	allocateInstance(java.lang.Class<T> t) 直接创建对象,不会触发初始化代码块和构造函数
static int	arrayBaseOffset(java.lang.Class arrayClass)
static int	arrayIndexScale(java.lang.Class<?> arrayClass)
static boolean	compareAndSwapInt(java.lang.Object o, long offset, int oldVal, int newVal)
static boolean	compareAndSwapLong(java.lang.Object o, long offset, long oldVal, long newVal)
static boolean	compareAndSwapObject(java.lang.Object o, long offset, java.lang.Object oldVal, java.lang.Object newVal)
static void	fullFence()
static long	getAddress(java.lang.Object obj) 获取对象的内存地址
static int	getAndAddInt(java.lang.Object o, long offset, int newValue)
static long	getAndAddLong(java.lang.Object o, long offset, long newValue)
static int	getAndSetInt(java.lang.Object o, long offset, int newValue)
static long	getAndSetLong(java.lang.Object o, long offset, long newValue)
static java.lang.Object	getAndSetObject(java.lang.Object o, long offset, java.lang.Object newValue)
static boolean	getBoolean(java.lang.Object o, long offset)
static boolean	getBooleanVolatile(java.lang.Object o, long offset)
static byte	getByte(java.lang.Object o, long offset)
static byte	getByteVolatile(java.lang.Object o, long offset)
static char	getChar(java.lang.Object o, long offset)
static char	getCharVolatile(java.lang.Object o, long offset)
static double	getDouble(java.lang.Object o, long offset)
static double	getDoubleVolatile(java.lang.Object o, long offset)
static float	getFloat(java.lang.Object o, long offset)
static float	getFloatVolatile(java.lang.Object o, long offset)
static sun.misc.Unsafe	getInstance()
static int	getInt(java.lang.Object o, long offset)
static int	getIntVolatile(java.lang.Object o, long offset)
static long	getLong(java.lang.Object o, long offset)
static long	getLongVolatile(java.lang.Object o, long offset)
static java.lang.Object	getObject(java.lang.Object o, long offset)
static java.lang.Object	getObjectVolatile(java.lang.Object o, long offset)
static short	getShort(java.lang.Object o, long offset)
static short	getShortVolatile(java.lang.Object o, long offset)
static void	loadFence()
static long	objectFieldOffset(java.lang.reflect.Field field)
static int	pageSize()
static void	putBoolean(java.lang.Object o, long offset, boolean val)
static void	putBooleanVolatile(java.lang.Object o, long offset, boolean value)
static void	putByte(java.lang.Object o, long offset, byte val)
static void	putByteVolatile(java.lang.Object o, long offset, byte value)
static void	putChar(java.lang.Object o, long offset, char val)
static void	putCharVolatile(java.lang.Object o, long offset, char value)
static void	putDouble(java.lang.Object o, long offset, double val)
static void	putDoubleVolatile(java.lang.Object o, long offset, double value)
static void	putFloat(java.lang.Object o, long offset, float val)
static void	putFloatVolatile(java.lang.Object o, long offset, float value)
static void	putInt(java.lang.Object o, long offset, int val)
static void	putIntVolatile(java.lang.Object o, long offset, int value)
static void	putLong(java.lang.Object o, long offset, long val)
static void	putLongVolatile(java.lang.Object o, long offset, long value)
static void	putObject(java.lang.Object o, long offset, java.lang.Object val)
static void	putObjectVolatile(java.lang.Object o, long offset, java.lang.Object value)
static void	putOrderedInt(java.lang.Object o, long offset, int value)
static void	putOrderedLong(java.lang.Object o, long offset, long value)
static void	putOrderedObject(java.lang.Object o, long offset, java.lang.Object value)
static void	putShort(java.lang.Object o, long offset, short val)
static void	putShortVolatile(java.lang.Object o, long offset, short value)
static java.lang.Object	staticFieldBase(java.lang.reflect.Field field)
static long	staticFieldOffset(java.lang.reflect.Field field)
static void	storeFence()
static void	throwException(java.lang.Throwable e) 经常需要catch受检查的异常,然后用某个不受检查的异常包装并抛出 用这个方法可以直接抛不受检查的异常 例: UnsafeUtils.throwException(new Exception());throw new RuntimeException(); 这里throw new RuntimeException();只起中断作用,永远不会被执行

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

ARRAY_BOOLEAN_BASE_OFFSET

public static final long ARRAY_BOOLEAN_BASE_OFFSET

ARRAY_BYTE_BASE_OFFSET

public static final long ARRAY_BYTE_BASE_OFFSET

ARRAY_SHORT_BASE_OFFSET

public static final long ARRAY_SHORT_BASE_OFFSET

ARRAY_CHAR_BASE_OFFSET

public static final long ARRAY_CHAR_BASE_OFFSET

ARRAY_INT_BASE_OFFSET

public static final long ARRAY_INT_BASE_OFFSET

ARRAY_LONG_BASE_OFFSET

public static final long ARRAY_LONG_BASE_OFFSET

ARRAY_FLOAT_BASE_OFFSET

public static final long ARRAY_FLOAT_BASE_OFFSET

ARRAY_DOUBLE_BASE_OFFSET

public static final long ARRAY_DOUBLE_BASE_OFFSET

ARRAY_OBJECT_BASE_OFFSET

public static final long ARRAY_OBJECT_BASE_OFFSET

ARRAY_BOOLEAN_INDEX_SCALE

public static final long ARRAY_BOOLEAN_INDEX_SCALE

1

ARRAY_BYTE_INDEX_SCALE

public static final long ARRAY_BYTE_INDEX_SCALE

ARRAY_SHORT_INDEX_SCALE

public static final long ARRAY_SHORT_INDEX_SCALE

ARRAY_CHAR_INDEX_SCALE

public static final long ARRAY_CHAR_INDEX_SCALE

ARRAY_INT_INDEX_SCALE

public static final long ARRAY_INT_INDEX_SCALE

ARRAY_LONG_INDEX_SCALE

public static final long ARRAY_LONG_INDEX_SCALE

ARRAY_FLOAT_INDEX_SCALE

public static final long ARRAY_FLOAT_INDEX_SCALE

ARRAY_DOUBLE_INDEX_SCALE

public static final long ARRAY_DOUBLE_INDEX_SCALE

ARRAY_OBJECT_INDEX_SCALE

public static final long ARRAY_OBJECT_INDEX_SCALE

ADDRESS_SIZE

public static final int ADDRESS_SIZE

addressSize

public static final int addressSize

构造器详细资料

UnsafeUtils

public UnsafeUtils()

方法详细资料

getInstance

public static sun.misc.Unsafe getInstance()

getInt

public static int getInt(java.lang.Object o,
                         long offset)

putInt

public static void putInt(java.lang.Object o,
                          long offset,
                          int val)

getObject

public static java.lang.Object getObject(java.lang.Object o,
                                         long offset)

putObject

public static void putObject(java.lang.Object o,
                             long offset,
                             java.lang.Object val)

getBoolean

public static boolean getBoolean(java.lang.Object o,
                                 long offset)

putBoolean

public static void putBoolean(java.lang.Object o,
                              long offset,
                              boolean val)

getByte

public static byte getByte(java.lang.Object o,
                           long offset)

putByte

public static void putByte(java.lang.Object o,
                           long offset,
                           byte val)

getShort

public static short getShort(java.lang.Object o,
                             long offset)

putShort

public static void putShort(java.lang.Object o,
                            long offset,
                            short val)

getChar

public static char getChar(java.lang.Object o,
                           long offset)

putChar

public static void putChar(java.lang.Object o,
                           long offset,
                           char val)

getLong

public static long getLong(java.lang.Object o,
                           long offset)

putLong

public static void putLong(java.lang.Object o,
                           long offset,
                           long val)

getFloat

public static float getFloat(java.lang.Object o,
                             long offset)

putFloat

public static void putFloat(java.lang.Object o,
                            long offset,
                            float val)

getDouble

public static double getDouble(java.lang.Object o,
                               long offset)

putDouble

public static void putDouble(java.lang.Object o,
                             long offset,
                             double val)

staticFieldOffset

public static long staticFieldOffset(java.lang.reflect.Field field)

objectFieldOffset

public static long objectFieldOffset(java.lang.reflect.Field field)

staticFieldBase

public static java.lang.Object staticFieldBase(java.lang.reflect.Field field)

arrayBaseOffset

public static int arrayBaseOffset(java.lang.Class arrayClass)

arrayIndexScale

public static int arrayIndexScale(java.lang.Class<?> arrayClass)

addressSize

public static int addressSize()

pageSize

public static int pageSize()

getObjectVolatile

public static java.lang.Object getObjectVolatile(java.lang.Object o,
                                                 long offset)

putObjectVolatile

public static void putObjectVolatile(java.lang.Object o,
                                     long offset,
                                     java.lang.Object value)

getIntVolatile

public static int getIntVolatile(java.lang.Object o,
                                 long offset)

putIntVolatile

public static void putIntVolatile(java.lang.Object o,
                                  long offset,
                                  int value)

getBooleanVolatile

public static boolean getBooleanVolatile(java.lang.Object o,
                                         long offset)

putBooleanVolatile

public static void putBooleanVolatile(java.lang.Object o,
                                      long offset,
                                      boolean value)

getByteVolatile

public static byte getByteVolatile(java.lang.Object o,
                                   long offset)

putByteVolatile

public static void putByteVolatile(java.lang.Object o,
                                   long offset,
                                   byte value)

getShortVolatile

public static short getShortVolatile(java.lang.Object o,
                                     long offset)

putShortVolatile

public static void putShortVolatile(java.lang.Object o,
                                    long offset,
                                    short value)

getCharVolatile

public static char getCharVolatile(java.lang.Object o,
                                   long offset)

putCharVolatile

public static void putCharVolatile(java.lang.Object o,
                                   long offset,
                                   char value)

getLongVolatile

public static long getLongVolatile(java.lang.Object o,
                                   long offset)

putLongVolatile

public static void putLongVolatile(java.lang.Object o,
                                   long offset,
                                   long value)

getFloatVolatile

public static float getFloatVolatile(java.lang.Object o,
                                     long offset)

putFloatVolatile

public static void putFloatVolatile(java.lang.Object o,
                                    long offset,
                                    float value)

getDoubleVolatile

public static double getDoubleVolatile(java.lang.Object o,
                                       long offset)

putDoubleVolatile

public static void putDoubleVolatile(java.lang.Object o,
                                     long offset,
                                     double value)

putOrderedObject

public static void putOrderedObject(java.lang.Object o,
                                    long offset,
                                    java.lang.Object value)

putOrderedInt

public static void putOrderedInt(java.lang.Object o,
                                 long offset,
                                 int value)

putOrderedLong

public static void putOrderedLong(java.lang.Object o,
                                  long offset,
                                  long value)

compareAndSwapObject

public static boolean compareAndSwapObject(java.lang.Object o,
                                           long offset,
                                           java.lang.Object oldVal,
                                           java.lang.Object newVal)

compareAndSwapInt

public static boolean compareAndSwapInt(java.lang.Object o,
                                        long offset,
                                        int oldVal,
                                        int newVal)

compareAndSwapLong

public static boolean compareAndSwapLong(java.lang.Object o,
                                         long offset,
                                         long oldVal,
                                         long newVal)

getAndAddInt

public static int getAndAddInt(java.lang.Object o,
                               long offset,
                               int newValue)

getAndAddLong

public static long getAndAddLong(java.lang.Object o,
                                 long offset,
                                 long newValue)

getAndSetInt

public static int getAndSetInt(java.lang.Object o,
                               long offset,
                               int newValue)

getAndSetLong

public static long getAndSetLong(java.lang.Object o,
                                 long offset,
                                 long newValue)

getAndSetObject

public static java.lang.Object getAndSetObject(java.lang.Object o,
                                               long offset,
                                               java.lang.Object newValue)

loadFence

public static void loadFence()

storeFence

public static void storeFence()

fullFence

public static void fullFence()

getAddress

public static long getAddress(java.lang.Object obj)

获取对象的内存地址

参数:

obj -

返回:

allocateInstance

public static <T> T allocateInstance(java.lang.Class<T> t)
                              throws java.lang.InstantiationException

直接创建对象,不会触发初始化代码块和构造函数

类型参数:

T -

参数:

t -

返回:

抛出:

java.lang.InstantiationException

throwException

public static void throwException(java.lang.Throwable e)

经常需要catch受检查的异常,然后用某个不受检查的异常包装并抛出 用这个方法可以直接抛不受检查的异常 例: UnsafeUtils.throwException(new Exception());throw new RuntimeException(); 这里throw new RuntimeException();只起中断作用,永远不会被执行

参数:

e -