EDU.oswego.cs.dl.util.concurrent

Class SynchronizedBoolean

public class SynchronizedBoolean extends SynchronizedVariable implements Comparable, Cloneable

A class useful for offloading synch for boolean instance variables.

Field Summary
protected boolean	value_

Constructor Summary
	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
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.

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

and

public boolean and(boolean b)

Set value to value & b.

Returns: the new value

commit

public boolean commit(boolean assumedValue, boolean newValue)

Set value to newValue only if it is currently assumedValue.

Returns: true if successful

compareTo

public int compareTo(SynchronizedBoolean other)

complement

public boolean complement()

Set the value to its complement

Returns: the new value

get

public final boolean get()

Return the current value

or

public boolean or(boolean b)

Set value to value | b.

Returns: the new value

set

public boolean set(boolean newValue)

Set to newValue.

Returns: the old value

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

toString

public String toString()

xor

public boolean xor(boolean b)

Set value to value ^ b.

Returns: the new value