blah.concurrency.second

Class FieldReference

java.lang.Object

blah.concurrency.second.FieldReference

public class FieldReference
extends Object

A simple CAS abstraction using Unsafe class.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) long	fieldAddress
(package private) Object	target
(package private) static sun.misc.Unsafe	unsafe

Constructor Summary

Constructors

Constructor and Description
FieldReference()

Method Summary

Modifier and Type	Method and Description
boolean	compareAndSet(int expect, int update) Atomically sets the value to the given updated value if the current value == the expected value.
<T> boolean	compareAndSet(T expect, T update)
static long	getFieldAddress(Class<?> clazz, String fieldName)
static sun.misc.Unsafe	getUnsafe()
static FieldReference	wrap(Object object, String fieldName)

Methods inherited from class java.lang.Object

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

Field Detail

unsafe

static final sun.misc.Unsafe unsafe

target

final Object target

fieldAddress

final long fieldAddress

Constructor Detail

FieldReference

public FieldReference()

Method Detail

getUnsafe

public static sun.misc.Unsafe getUnsafe()

wrap

public static FieldReference wrap(Object object,
                                  String fieldName)

getFieldAddress

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

compareAndSet

public final boolean compareAndSet(int expect,
                                   int update)

Atomically sets the value to the given updated value if the current value == the expected value.

Parameters:

expect - the expected value

update - the new value

Returns:

true if successful. False return indicates that the actual value was not equal to the expected value.

compareAndSet

public final <T> boolean compareAndSet(T expect,
                                       T update)