java.util.concurrent.atomic
Class AtomicLongArray

java.lang.Object
  java.util.concurrent.atomic.AtomicLongArray

All Implemented Interfaces:

java.io.Serializable

public final class AtomicLongArray

extends java.lang.Object

implements java.io.Serializable

An AtomicLongArray maintains a long array in which elements may be updated atomically, and are accessed using volatile semantics.

Since:

1.5

Author:

Doug Lea

See Also:

Serialized Form

Constructor Summary

AtomicLongArray(int length)
Create a new AtomicLongArray of given length.

Method Summary

long	addAndGet(int i, long delta) Atomically add the given value to element at index i.
boolean	compareAndSet(int i, long expect, long update) Atomically set the value to the given updated value if the current value == the expected value.
long	decrementAndGet(int i) Atomically decrement the element at index i.
long	get(int i) Get the current value at position i.
long	getAndAdd(int i, long delta) Atomically add the given value to element at index i.
long	getAndDecrement(int i) Atomically decrement by one the element at index i.
long	getAndIncrement(int i) Atomically increment by one the element at index i.
long	getAndSet(int i, long newValue) Set the element at position i to the given value and return the old value.
long	incrementAndGet(int i) Atomically increment the element at index i.
int	length() Return the length of the array.
void	set(int i, long newValue) Set the element at position i to the given value.
boolean	weakCompareAndSet(int i, long expect, long update) Atomically set the value to the given updated value if the current value == the expected value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AtomicLongArray

public AtomicLongArray(int length)

Create a new AtomicLongArray of given length.

Parameters:

length - the length of the array

Method Detail

length

public int length()

Return the length of the array.

get

public long get(int i)

Get the current value at position i.

Parameters:

i - the index

Returns:

the current value

set

public void set(int i,
                long newValue)

Set the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

getAndSet

public long getAndSet(int i,
                      long newValue)

Set the element at position i to the given value and return the old value.

Parameters:

i - the index

newValue - the new value

Returns:

the previous value

compareAndSet

public boolean compareAndSet(int i,
                             long expect,
                             long update)

Atomically set the value to the given updated value if the current value == the expected value.

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful. False return indicates that the actual value was not equal to the expected value.

weakCompareAndSet

public boolean weakCompareAndSet(int i,
                                 long expect,
                                 long update)

Atomically set the value to the given updated value if the current value == the expected value. May fail spuriously.

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful.

getAndIncrement

public long getAndIncrement(int i)

Atomically increment by one the element at index i.

Parameters:

i - the index

Returns:

the previous value;

getAndDecrement

public long getAndDecrement(int i)

Atomically decrement by one the element at index i.

Parameters:

i - the index

Returns:

the previous value;

getAndAdd

public long getAndAdd(int i,
                      long delta)

Atomically add the given value to element at index i.

Parameters:

i - the index

delta - the value to add

Returns:

the previous value;

incrementAndGet

public long incrementAndGet(int i)

Atomically increment the element at index i.

Parameters:

i - the index

Returns:

the updated value;

decrementAndGet

public long decrementAndGet(int i)

Atomically decrement the element at index i.

Parameters:

i - the index

Returns:

the updated value;

addAndGet

public long addAndGet(int i,
                      long delta)

Atomically add the given value to element at index i.

Parameters:

i - the index

delta - the value to add

Returns:

the updated value;