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Java Source Code / Java Documentation » 6.0 JDK Core » Collections Jar Zip Logging regex » java.util.concurrent.atomic

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

java.lang .Number

java.util.concurrent.atomic .AtomicLong

AtomicLong
public class AtomicLong extends Number implements java.io.Serializable(Code)
	A long value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicLong is used in applications such as atomically incremented sequence numbers, and cannot be used as a replacement for a java.lang.Long . However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes. since: 1.5 author: Doug Lea

Field Summary
final static boolean	VM_SUPPORTS_LONG_CAS Records whether the underlying JVM supports lockless compareAndSwap for longs.

Constructor Summary
public	AtomicLong(long initialValue) Creates a new AtomicLong with the given initial value.
public	AtomicLong() Creates a new AtomicLong with initial value 0 .

Method Summary
final public long	addAndGet(long delta) Atomically adds the given value to the current value.
final public boolean	compareAndSet(long expect, long update) Atomically sets the value to the given updated value if the current value == the expected value. Parameters: expect - the expected value Parameters: update - the new value true if successful.
final public long	decrementAndGet() Atomically decrements by one the current value.
public double	doubleValue()
public float	floatValue()
final public long	get() Gets the current value.
final public long	getAndAdd(long delta) Atomically adds the given value to the current value.
final public long	getAndDecrement() Atomically decrements by one the current value.
final public long	getAndIncrement() Atomically increments by one the current value.
final public long	getAndSet(long newValue) Atomically sets to the given value and returns the old value.
final public long	incrementAndGet() Atomically increments by one the current value.
public int	intValue()
final public void	lazySet(long newValue) Eventually sets to the given value.
public long	longValue()
final public void	set(long newValue) Sets to the given value.
public String	toString() Returns the String representation of the current value.
final public boolean	weakCompareAndSet(long expect, long update) Atomically sets the value to the given updated value if the current value == the expected value.

Field Detail

VM_SUPPORTS_LONG_CAS
final static boolean VM_SUPPORTS_LONG_CAS(Code)
	Records whether the underlying JVM supports lockless compareAndSwap for longs. While the Unsafe.compareAndSwapLong method works in either case, some constructions should be handled at Java level to avoid locking user-visible locks.

Constructor Detail

AtomicLong
public AtomicLong(long initialValue)(Code)
	Creates a new AtomicLong with the given initial value. Parameters: initialValue - the initial value

AtomicLong
public AtomicLong()(Code)
	Creates a new AtomicLong with initial value 0 .

Method Detail

addAndGet
final public long addAndGet(long delta)(Code)
	Atomically adds the given value to the current value. Parameters: delta - the value to add the updated value

compareAndSet
final public boolean compareAndSet(long expect, long update)(Code)
	Atomically sets the value to the given updated value if the current value == the expected value. Parameters: expect - the expected value Parameters: update - the new value true if successful. False return indicates thatthe actual value was not equal to the expected value.

decrementAndGet
final public long decrementAndGet()(Code)
	Atomically decrements by one the current value. the updated value

doubleValue
public double doubleValue()(Code)

floatValue
public float floatValue()(Code)

get
final public long get()(Code)
	Gets the current value. the current value

getAndAdd
final public long getAndAdd(long delta)(Code)
	Atomically adds the given value to the current value. Parameters: delta - the value to add the previous value

getAndDecrement
final public long getAndDecrement()(Code)
	Atomically decrements by one the current value. the previous value

getAndIncrement
final public long getAndIncrement()(Code)
	Atomically increments by one the current value. the previous value

getAndSet
final public long getAndSet(long newValue)(Code)
	Atomically sets to the given value and returns the old value. Parameters: newValue - the new value the previous value

incrementAndGet
final public long incrementAndGet()(Code)
	Atomically increments by one the current value. the updated value

intValue
public int intValue()(Code)

lazySet
final public void lazySet(long newValue)(Code)
	Eventually sets to the given value. Parameters: newValue - the new value since: 1.6

longValue
public long longValue()(Code)

set
final public void set(long newValue)(Code)
	Sets to the given value. Parameters: newValue - the new value

toString
public String toString()(Code)
	Returns the String representation of the current value. the String representation of the current value.

weakCompareAndSet
final public boolean weakCompareAndSet(long expect, long update)(Code)
	Atomically sets the value to the given updated value if the current value == the expected value. May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet . Parameters: expect - the expected value Parameters: update - the new value true if successful.

Methods inherited from java.lang.Number

public byte byteValue()(Code)(Java Doc)
abstract public double doubleValue()(Code)(Java Doc)
abstract public float floatValue()(Code)(Java Doc)
abstract public int intValue()(Code)(Java Doc)
abstract public long longValue()(Code)(Java Doc)
public short shortValue()(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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