java.util.concurrent.atomic
Class AtomicIntegerArray

java.lang.Object
  java.util.concurrent.atomic.AtomicIntegerArray

All Implemented Interfaces:

java.io.Serializable

public final class AtomicIntegerArray

extends java.lang.Object

implements java.io.Serializable

An AtomicIntegerArray maintains a int 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

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

Method Summary

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

AtomicIntegerArray

public AtomicIntegerArray(int length)

Create a new AtomicIntegerArray of given length.

Parameters:

length - the length of the array

Method Detail

length

public int length()

Return the length of the array.

get

public int get(int i)

Get the current value at position i.

Parameters:

i - the index

Returns:

the current value

set

public void set(int i,
                int newValue)

Set the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

getAndSet

public int getAndSet(int i,
                     int 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,
                             int expect,
                             int 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,
                                 int expect,
                                 int 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 int getAndIncrement(int i)

Atomically increment by one the element at index i.

Parameters:

i - the index

Returns:

the previous value;

getAndDecrement

public int getAndDecrement(int i)

Atomically decrement by one the element at index i.

Parameters:

i - the index

Returns:

the previous value;

getAndAdd

public int getAndAdd(int i,
                     int 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 int incrementAndGet(int i)

Atomically increment by one the element at index i.

Parameters:

i - the index

Returns:

the updated value;

decrementAndGet

public int decrementAndGet(int i)

Atomically decrement by one the element at index i.

Parameters:

i - the index

Returns:

the updated value;

addAndGet

public int addAndGet(int i,
                     int delta)

Atomically add the given value to element at index i.

Parameters:

i - the index

delta - the value to add

Returns:

the updated value;