Package io.netty.util

Class DefaultAttributeMap.DefaultAttribute<T>

java.lang.Object

java.util.concurrent.atomic.AtomicReference<T>

io.netty.util.DefaultAttributeMap.DefaultAttribute<T>

All Implemented Interfaces:

Attribute<T>, Serializable

Enclosing class:

DefaultAttributeMap

private static final class DefaultAttributeMap.DefaultAttribute<T>
extends AtomicReference<T>
implements Attribute<T>

Field Summary

Fields

Modifier and Type	Field	Description
private DefaultAttributeMap	attributeMap
private final AttributeKey<T>	key
private static final AtomicReferenceFieldUpdater<DefaultAttributeMap.DefaultAttribute,DefaultAttributeMap>	MAP_UPDATER
private static final long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
DefaultAttribute(DefaultAttributeMap attributeMap, AttributeKey<T> key)

Method Summary

Modifier and Type	Method	Description
T	getAndRemove()	Removes this attribute from the AttributeMap and returns the old value.
private boolean	isRemoved()
AttributeKey<T>	key()	Returns the key of this attribute.
void	remove()	Removes this attribute from the AttributeMap.
T	setIfAbsent(T value)	Atomically sets to the given value if this Attribute's value is null.

Methods inherited from class java.util.concurrent.atomic.AtomicReference

accumulateAndGet, compareAndExchange, compareAndExchangeAcquire, compareAndExchangeRelease, compareAndSet, get, getAcquire, getAndAccumulate, getAndSet, getAndUpdate, getOpaque, getPlain, lazySet, set, setOpaque, setPlain, setRelease, toString, updateAndGet, weakCompareAndSet, weakCompareAndSetAcquire, weakCompareAndSetPlain, weakCompareAndSetRelease, weakCompareAndSetVolatile

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.netty.util.Attribute

compareAndSet, get, getAndSet, set

Field Details

MAP_UPDATER

private static final AtomicReferenceFieldUpdater<DefaultAttributeMap.DefaultAttribute,DefaultAttributeMap> MAP_UPDATER

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

attributeMap

private volatile DefaultAttributeMap attributeMap

key

private final AttributeKey<T> key

Constructor Details

DefaultAttribute

DefaultAttribute(DefaultAttributeMap attributeMap,
 AttributeKey<T> key)

Method Details

key

public AttributeKey<T> key()

Description copied from interface: Attribute

Returns the key of this attribute.

Specified by:

key in interface Attribute<T>

isRemoved

private boolean isRemoved()

setIfAbsent

public T setIfAbsent(T value)

Description copied from interface: Attribute

Atomically sets to the given value if this Attribute's value is null. If it was not possible to set the value as it contains a value it will just return the current value.

Specified by:

setIfAbsent in interface Attribute<T>

getAndRemove

public T getAndRemove()

Description copied from interface: Attribute

Removes this attribute from the AttributeMap and returns the old value. Subsequent Attribute.get() calls will return null. If you only want to return the old value and clear the Attribute while still keep it in the AttributeMap use Attribute.getAndSet(Object) with a value of null.

Be aware that even if you call this method another thread that has obtained a reference to this Attribute via AttributeMap.attr(AttributeKey) will still operate on the same instance. That said if now another thread or even the same thread later will call AttributeMap.attr(AttributeKey) again, a new Attribute instance is created and so is not the same as the previous one that was removed. Because of this special caution should be taken when you call Attribute.remove() or Attribute.getAndRemove().

Specified by:

getAndRemove in interface Attribute<T>

remove

public void remove()

Description copied from interface: Attribute

Removes this attribute from the AttributeMap. Subsequent Attribute.get() calls will return @{code null}. If you only want to remove the value and clear the Attribute while still keep it in AttributeMap use Attribute.set(Object) with a value of null.

Be aware that even if you call this method another thread that has obtained a reference to this Attribute via AttributeMap.attr(AttributeKey) will still operate on the same instance. That said if now another thread or even the same thread later will call AttributeMap.attr(AttributeKey) again, a new Attribute instance is created and so is not the same as the previous one that was removed. Because of this special caution should be taken when you call Attribute.remove() or Attribute.getAndRemove().

Specified by:

remove in interface Attribute<T>