EDU.oswego.cs.dl.util.concurrent

Class SynchronizedLong

public class SynchronizedLong extends SynchronizedVariable implements Comparable, Cloneable

A class useful for offloading synch for long instance variables.

Field Summary
protected long	value_

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

Method Summary
long	add(long amount) Add amount to value (i.e., set value += amount)
long	and(long b) Set value to value & b.
boolean	commit(long assumedValue, long newValue) Set value to newValue only if it is currently assumedValue.
int	compareTo(long other)
int	compareTo(SynchronizedLong other)
int	compareTo(Object other)
long	complement() Set the value to its complement
long	decrement() Decrement the value.
long	divide(long factor) Divide value by factor (i.e., set value /= factor)
boolean	equals(Object other)
long	get() Return the current value
int	hashCode()
long	increment() Increment the value.
long	multiply(long factor) Multiply value by factor (i.e., set value *= factor)
long	negate() Set the value to the negative of its old value
long	or(long b) Set value to value \| b.
long	set(long newValue) Set to newValue.
long	subtract(long amount) Subtract amount from value (i.e., set value -= amount)
long	swap(SynchronizedLong other) Atomically swap values with another SynchronizedLong.
String	toString()
long	xor(long b) Set value to value ^ b.

Field Detail

value_

protected long value_

Constructor Detail

SynchronizedLong

public SynchronizedLong(long initialValue)

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

SynchronizedLong

public SynchronizedLong(long initialValue, Object lock)

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

Method Detail

add

public long add(long amount)

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

Returns: the new value

and

public long and(long b)

Set value to value & b.

Returns: the new value

commit

public boolean commit(long assumedValue, long newValue)

Set value to newValue only if it is currently assumedValue.

Returns: true if successful

compareTo

public int compareTo(long other)

compareTo

public int compareTo(SynchronizedLong other)

compareTo

public int compareTo(Object other)

complement

public long complement()

Set the value to its complement

Returns: the new value

decrement

public long decrement()

Decrement the value.

Returns: the new value

divide

public long divide(long factor)

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

Returns: the new value

equals

public boolean equals(Object other)

get

public final long get()

Return the current value

hashCode

public int hashCode()

increment

public long increment()

Increment the value.

Returns: the new value

multiply

public long multiply(long factor)

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

Returns: the new value

negate

public long negate()

Set the value to the negative of its old value

Returns: the new value

or

public long or(long b)

Set value to value | b.

Returns: the new value

set

public long set(long newValue)

Set to newValue.

Returns: the old value

subtract

public long subtract(long amount)

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

Returns: the new value

swap

public long swap(SynchronizedLong other)

Atomically swap values with another SynchronizedLong. Uses identityHashCode to avoid deadlock when two SynchronizedLongs attempt to simultaneously swap with each other.

Returns: the new value

toString

public String toString()

xor

public long xor(long b)

Set value to value ^ b.

Returns: the new value