Package com.linecorp.armeria.common.util

Class AbstractListenable<T>

java.lang.Object

com.linecorp.armeria.common.util.AbstractListenable<T>

All Implemented Interfaces:

Listenable<T>

Direct Known Subclasses:

DynamicEndpointGroup, SettableHealthChecker

public abstract class AbstractListenable<T>
extends Object
implements Listenable<T>

A skeletal Listenable implementation.

Constructor Summary

Constructors

Constructor	Description
AbstractListenable()

Method Summary

Modifier and Type	Method	Description
final void	addListener(Consumer<? super T> listener)	Adds a Consumer that will be invoked when a Listenable changes its value.
final void	addListener(Consumer<? super T> listener, boolean notifyLatestValue)	Adds a Consumer that will be invoked when a Listenable changes its value.
protected T	latestValue()	Returns the latest value notified before.
protected final void	notifyListeners(T latestValue)	Notify the new value changes to the listeners added via addListener(Consumer).
final void	removeListener(Consumer<?> listener)	Remove a listener.

Methods inherited from class java.lang.Object

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

Constructor Details

AbstractListenable

public AbstractListenable()

Method Details

notifyListeners

protected final void notifyListeners(T latestValue)

Notify the new value changes to the listeners added via addListener(Consumer).

latestValue

@Nullable
protected T latestValue()

Returns the latest value notified before. null if the value has not been initialized yet or the implementation of this class cannot cache it.

addListener

public final void addListener(Consumer<? super T> listener)

Description copied from interface: Listenable

Adds a Consumer that will be invoked when a Listenable changes its value.

Specified by:

addListener in interface Listenable<T>

addListener

public final void addListener(Consumer<? super T> listener,
 boolean notifyLatestValue)

Adds a Consumer that will be invoked when a Listenable changes its value. If notifyLatestValue is set to true and the latestValue() is not null, the Consumer will be invoked immediately with the latestValue().

removeListener

public final void removeListener(Consumer<?> listener)

Description copied from interface: Listenable

Remove a listener.

Specified by:

removeListener in interface Listenable<T>