EDU.oswego.cs.dl.util.concurrent
Class SynchronizedRef
- Executor
public class SynchronizedRef
A simple class maintaining a single reference variable that
is always accessed and updated under synchronization.
[
Introduction to this package. ]
protected Object | value_ - The maintained reference *
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SynchronizedRef(Object initialValue) - Create a SynchronizedRef initially holding the given reference
and using its own internal lock.
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SynchronizedRef(Object initialValue, Object lock) - Make a new SynchronizedRef with the given initial value,
and using the supplied lock.
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boolean | commit(Object assumedValue, Object newValue) - Set value to newValue only if it is currently assumedValue.
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Object | get() - Return the current value
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Object | set(Object newValue) - Set to newValue.
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Object | swap(SynchronizedRef other) - Atomically swap values with another SynchronizedRef.
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value_
protected Object value_
The maintained reference *
SynchronizedRef
public SynchronizedRef(Object initialValue)
Create a SynchronizedRef initially holding the given reference
and using its own internal lock.
SynchronizedRef
public SynchronizedRef(Object initialValue,
Object lock)
Make a new SynchronizedRef with the given initial value,
and using the supplied lock.
commit
public boolean commit(Object assumedValue,
Object newValue)
Set value to newValue only if it is currently assumedValue.
get
public final Object get()
Return the current value
set
public Object set(Object newValue)
Set to newValue.
swap
public Object swap(SynchronizedRef other)
Atomically swap values with another SynchronizedRef.
Uses identityHashCode to avoid deadlock when
two SynchronizedRefs attempt to simultaneously swap with each other.
(Note: Ordering via identyHashCode is not strictly guaranteed
by the language specification to return unique, orderable
values, but in practice JVMs rely on them being unique.)