Package rx.internal.util.unsafe

Class UnsafeAccess

java.lang.Object

rx.internal.util.unsafe.UnsafeAccess

@SuppressAnimalSniffer
public final class UnsafeAccess
extends Object

All use of this class MUST first check that UnsafeAccess.isUnsafeAvailable() == true otherwise NPEs will happen in environments without "suc.misc.Unsafe" such as Android.

Note that you can force RxJava to not use Unsafe API by setting any value to System Property rx.unsafe-disable.

Field Summary

Fields

Modifier and Type	Field	Description
private static final boolean	DISABLED_BY_USER
static final sun.misc.Unsafe	UNSAFE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	UnsafeAccess()

Method Summary

Modifier and Type	Method	Description
static long	addressOf(Class<?> clazz, String fieldName)	Returns the address of the specific field on the class and wraps a NoSuchFieldException into an internal error.
static boolean	compareAndSwapInt(Object obj, long offset, int expected, int newValue)
static int	getAndAddInt(Object obj, long offset, int n)
static int	getAndIncrementInt(Object obj, long offset)
static int	getAndSetInt(Object obj, long offset, int newValue)
static boolean	isUnsafeAvailable()

Methods inherited from class java.lang.Object

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

Field Details

UNSAFE

public static final sun.misc.Unsafe UNSAFE

DISABLED_BY_USER

private static final boolean DISABLED_BY_USER

Constructor Details

UnsafeAccess

private UnsafeAccess()

Method Details

isUnsafeAvailable

public static boolean isUnsafeAvailable()

getAndIncrementInt

public static int getAndIncrementInt(Object obj,
 long offset)

getAndAddInt

public static int getAndAddInt(Object obj,
 long offset,
 int n)

getAndSetInt

public static int getAndSetInt(Object obj,
 long offset,
 int newValue)

compareAndSwapInt

public static boolean compareAndSwapInt(Object obj,
 long offset,
 int expected,
 int newValue)

addressOf

public static long addressOf(Class<?> clazz,
 String fieldName)

Returns the address of the specific field on the class and wraps a NoSuchFieldException into an internal error.

One can avoid using static initializers this way and just assign the address directly to the target static field.

Parameters:

clazz - the target class

fieldName - the target field name

Returns:

the address (offset) of the field