de.ipcon.tools

Class AtomicCompareAndSet

java.lang.Object

de.ipcon.tools.AtomicCompareAndSet

public class AtomicCompareAndSet
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static java.lang.Object	lazyInitObjectReference(java.lang.Object o, java.lang.String fieldName, java.lang.Object initialValue) uses the Unsafe API to atomically initialize a field which might be null with the given value, returning the non-null value which was set already or just now.

Methods inherited from class java.lang.Object

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

Method Detail

lazyInitObjectReference

public static final java.lang.Object lazyInitObjectReference(java.lang.Object o,
                                                             java.lang.String fieldName,
                                                             java.lang.Object initialValue)

uses the Unsafe API to atomically initialize a field which might be null with the given value, returning the non-null value which was set already or just now.

Parameters:

o - object containing the field

fieldName - the name of the field to be initialized

initialValue - the value to set if and only if the field 'fieldname' within the object 'o' was null

Returns:

either the value of 'o'.'fieldName', if it was null, otherwise initialValue