Package org.springframework.context.event

Interface SmartApplicationListener

All Superinterfaces:

ApplicationListener<ApplicationEvent>, EventListener, Ordered

All Known Subinterfaces:

GenericApplicationListener

All Known Implementing Classes:

ApplicationListenerMethodAdapter, DefaultSimpUserRegistry, GenericApplicationListenerAdapter, MultiServerUserRegistry, SourceFilteringListener, TransactionalApplicationListenerMethodAdapter

public interface SmartApplicationListener
extends ApplicationListener<ApplicationEvent>, Ordered

Extended variant of the standard ApplicationListener interface, exposing further metadata such as the supported event and source type.

For full introspection of generic event types, consider implementing the GenericApplicationListener interface instead.

Since:

3.0

Author:

Juergen Hoeller

See Also:

• GenericApplicationListener
• GenericApplicationListenerAdapter

Field Summary

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Method Summary

Modifier and Type	Method	Description
default String	getListenerId()	Return an optional identifier for the listener.
default int	getOrder()	Determine this listener's order in a set of listeners for the same event.
boolean	supportsEventType(Class<? extends ApplicationEvent> eventType)	Determine whether this listener actually supports the given event type.
default boolean	supportsSourceType(Class<?> sourceType)	Determine whether this listener actually supports the given source type.

Methods inherited from interface org.springframework.context.ApplicationListener

onApplicationEvent

Method Details

supportsEventType

boolean supportsEventType(Class<? extends ApplicationEvent> eventType)

Determine whether this listener actually supports the given event type.

Parameters:

eventType - the event type (never null)

supportsSourceType

default boolean supportsSourceType(@Nullable
 Class<?> sourceType)

Determine whether this listener actually supports the given source type.

The default implementation always returns true.

Parameters:

sourceType - the source type, or null if no source

getOrder

default int getOrder()

Determine this listener's order in a set of listeners for the same event.

The default implementation returns Ordered.LOWEST_PRECEDENCE.

Specified by:

getOrder in interface Ordered

Returns:

the order value

See Also:

• Ordered.HIGHEST_PRECEDENCE
• Ordered.LOWEST_PRECEDENCE

getListenerId

default String getListenerId()

Return an optional identifier for the listener.

The default value is an empty String.

Since:

5.3.5

See Also:

• EventListener.id()
• ApplicationEventMulticaster.removeApplicationListeners(java.util.function.Predicate<org.springframework.context.ApplicationListener<?>>)