Java Doc for AtomicLong.java in  » Apache-Harmony-Java-SE » java-package » java » util » concurrent » atomic » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » 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      Record whether the underlying JVM supports lockless CompareAndSet for longs. Constructor Summary public   AtomicLong(long initialValue)      Create a new AtomicLong with the given initial value. public   AtomicLong()      Create a new AtomicLong with initial value 0. Method Summary final public  long addAndGet(long delta)      Atomically add the given value to current value. final public  boolean compareAndSet(long expect, long update)      Atomically set 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 decrement by one the current value. public  double doubleValue()      public  float floatValue()      final public  long get()      Get the current value. final public  long getAndAdd(long delta)      Atomically add the given value to current value. final public  long getAndDecrement()      Atomically decrement by one the current value. final public  long getAndIncrement()      Atomically increment by one the current value. final public  long getAndSet(long newValue)      Set to the give value and return the old value. final public  long incrementAndGet()      Atomically increment by one the current value. public  int intValue()      public  long longValue()      final public  void set(long newValue)      Set to the given value. public  String toString()      Returns the String representation of the current value. final public  boolean weakCompareAndSet(long expect, long update)      Atomically set 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) Record whether the underlying JVM supports lockless CompareAndSet for longs. While the unsafe.CompareAndSetLong 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) Create a new AtomicLong with the given initial value. Parameters:   initialValue - the initial value AtomicLong public AtomicLong()(Code) Create a new AtomicLong with initial value 0. Method Detail addAndGet final public long addAndGet(long delta)(Code) Atomically add the given value to current value. Parameters:   delta - the value to add the updated value compareAndSet final public boolean compareAndSet(long expect, long update)(Code) Atomically set 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 decrement by one the current value. the updated value doubleValue public double doubleValue()(Code) floatValue public float floatValue()(Code) get final public long get()(Code) Get the current value. the current value getAndAdd final public long getAndAdd(long delta)(Code) Atomically add the given value to current value. Parameters:   delta - the value to add the previous value getAndDecrement final public long getAndDecrement()(Code) Atomically decrement by one the current value. the previous value getAndIncrement final public long getAndIncrement()(Code) Atomically increment by one the current value. the previous value getAndSet final public long getAndSet(long newValue)(Code) Set to the give value and return the old value. Parameters:   newValue - the new value the previous value incrementAndGet final public long incrementAndGet()(Code) Atomically increment by one the current value. the updated value intValue public int intValue()(Code) longValue public long longValue()(Code) set final public void set(long newValue)(Code) Set 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 set the value to the given updated value if the current value == the expected value. May fail spuriously. 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 protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object object)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final public Class<? extends Object> getClass()(Code)(Java Doc) public int hashCode()(Code)(Java Doc) final public void notify()(Code)(Java Doc) final public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait(long millis) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)