io.netty.util

Interface Attribute<T>

Type Parameters:

T - the type of the value it holds.

public interface Attribute<T>

An attribute which allows to store an value reference. It may be updated atomically and so is thread-safe.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	compareAndSet(T oldValue, T newValue) Atomically sets the value to the given updated value if the current value == the expected value.
T	get() Returns the current value, which may be null
T	getAndSet(T value) Atomically sets to the given value and returns the old value which may be null if non was set before.
void	remove() Remove the current value which is stored in this Attribute, which means after this call get() will return null.
void	set(T value) Sets the value
T	setIfAbsent(T value) Atomically sets to the given value if this Attribute does not contain a value at the moment.

Method Detail

get

T get()

Returns the current value, which may be null

set

void set(T value)

Sets the value

getAndSet

T getAndSet(T value)

Atomically sets to the given value and returns the old value which may be null if non was set before.

setIfAbsent

T setIfAbsent(T value)

Atomically sets to the given value if this Attribute does not contain a value at the moment. If it was not possible to set the value as it contains a value it will just return the current value.

compareAndSet

boolean compareAndSet(T oldValue,
                    T newValue)

Atomically sets the value to the given updated value if the current value == the expected value. If it the set was successful it returns true otherwise false.

remove

void remove()

Remove the current value which is stored in this Attribute, which means after this call get() will return null.