EDU.oswego.cs.dl.util.concurrent

Class SynchronizedFloat

public class SynchronizedFloat extends SynchronizedVariable implements Comparable, Cloneable

A class useful for offloading synch for float instance variables.

Field Summary
protected float	value_

Constructor Summary
	SynchronizedFloat(float initialValue) Make a new SynchronizedFloat with the given initial value, and using its own internal lock.
	SynchronizedFloat(float initialValue, Object lock) Make a new SynchronizedFloat with the given initial value, and using the supplied lock.

Method Summary
float	add(float amount) Add amount to value (i.e., set value += amount)
boolean	commit(float assumedValue, float newValue) Set value to newValue only if it is currently assumedValue.
int	compareTo(float other)
int	compareTo(SynchronizedFloat other)
int	compareTo(Object other)
float	divide(float factor) Divide value by factor (i.e., set value /= factor)
boolean	equals(Object other)
float	get() Return the current value
int	hashCode()
float	multiply(float factor) Multiply value by factor (i.e., set value *= factor)
float	set(float newValue) Set to newValue.
float	subtract(float amount) Subtract amount from value (i.e., set value -= amount)
float	swap(SynchronizedFloat other) Atomically swap values with another SynchronizedFloat.
String	toString()

Constructor Detail

SynchronizedFloat

public SynchronizedFloat(float initialValue)

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

SynchronizedFloat

public SynchronizedFloat(float initialValue, Object lock)

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

Method Detail

add

public float add(float amount)

Add amount to value (i.e., set value += amount)

Returns: the new value

commit

public boolean commit(float assumedValue, float newValue)

Set value to newValue only if it is currently assumedValue.

Returns: true if successful

compareTo

public int compareTo(SynchronizedFloat other)

divide

public float divide(float factor)

Divide value by factor (i.e., set value /= factor)

Returns: the new value

get

public final float get()

Return the current value

multiply

public float multiply(float factor)

Multiply value by factor (i.e., set value *= factor)

Returns: the new value

set

public float set(float newValue)

Set to newValue.

Returns: the old value

subtract

public float subtract(float amount)

Subtract amount from value (i.e., set value -= amount)

Returns: the new value

swap

public float swap(SynchronizedFloat other)

Atomically swap values with another SynchronizedFloat. Uses identityHashCode to avoid deadlock when two SynchronizedFloats 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()