Package EDU.oswego.cs.dl.util.concurrent

Class SynchronizedBoolean

java.lang.Object

EDU.oswego.cs.dl.util.concurrent.SynchronizedVariable

EDU.oswego.cs.dl.util.concurrent.SynchronizedBoolean

All Implemented Interfaces:

Executor, Cloneable, Comparable

Direct Known Subclasses:

WaitableBoolean

public class SynchronizedBoolean
extends SynchronizedVariable
implements Comparable, Cloneable

A class useful for offloading synch for boolean instance variables.

[ Introduction to this package. ]

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	value_

Fields inherited from class EDU.oswego.cs.dl.util.concurrent.SynchronizedVariable

lock_

Constructor Summary

Constructors

Constructor	Description
SynchronizedBoolean(boolean initialValue)	Make a new SynchronizedBoolean with the given initial value, and using its own internal lock.
SynchronizedBoolean(boolean initialValue, Object lock)	Make a new SynchronizedBoolean with the given initial value, and using the supplied lock.

Method Summary

Modifier and Type	Method	Description
boolean	and(boolean b)	Set value to value & b.
boolean	commit(boolean assumedValue, boolean newValue)	Set value to newValue only if it is currently assumedValue.
int	compareTo(boolean other)
int	compareTo(SynchronizedBoolean other)
int	compareTo(Object other)
boolean	complement()	Set the value to its complement
boolean	equals(Object other)
boolean	get()	Return the current value
int	hashCode()
boolean	or(boolean b)	Set value to value | b.
boolean	set(boolean newValue)	Set to newValue.
boolean	swap(SynchronizedBoolean other)	Atomically swap values with another SynchronizedBoolean.
String	toString()
boolean	xor(boolean b)	Set value to value ^ b.

Methods inherited from class EDU.oswego.cs.dl.util.concurrent.SynchronizedVariable

execute, getLock

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

value_

protected boolean value_

Constructor Detail

SynchronizedBoolean

public SynchronizedBoolean(boolean initialValue)

Make a new SynchronizedBoolean with the given initial value, and using its own internal lock.

SynchronizedBoolean

public SynchronizedBoolean(boolean initialValue,
                           Object lock)

Make a new SynchronizedBoolean with the given initial value, and using the supplied lock.

Method Detail

get

public final boolean get()

Return the current value

set

public boolean set(boolean newValue)

Set to newValue.

Returns:

the old value

commit

public boolean commit(boolean assumedValue,
                      boolean newValue)

Set value to newValue only if it is currently assumedValue.

Returns:

true if successful

swap

public boolean swap(SynchronizedBoolean other)

Atomically swap values with another SynchronizedBoolean. Uses identityHashCode to avoid deadlock when two SynchronizedBooleans 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.)

Returns:

the new value

complement

public boolean complement()

Set the value to its complement

Returns:

the new value

and

public boolean and(boolean b)

Set value to value & b.

Returns:

the new value

or

public boolean or(boolean b)

Set value to value | b.

Returns:

the new value

xor

public boolean xor(boolean b)

Set value to value ^ b.

Returns:

the new value

compareTo

public int compareTo(boolean other)

compareTo

public int compareTo(SynchronizedBoolean other)

compareTo

public int compareTo(Object other)

Specified by:

compareTo in interface Comparable

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object