程序包 cn.taketoday.context.event

类 SourceFilteringListener

java.lang.Object

cn.taketoday.context.event.SourceFilteringListener

所有已实现的接口:

ApplicationListener<ApplicationEvent>, GenericApplicationListener, SmartApplicationListener, cn.taketoday.core.Ordered, EventListener

public class SourceFilteringListener
extends Object
implements GenericApplicationListener

ApplicationListener decorator that filters events from a specified event source, invoking its delegate listener for matching ApplicationEvent objects only.

Can also be used as base class, overriding the onApplicationEventInternal(cn.taketoday.context.ApplicationEvent) method instead of specifying a delegate listener.

从以下版本开始:

4.0 2022/5/27 15:47

作者:

Juergen Hoeller, Stephane Nicoll, Harry Yang

字段概要

从接口继承的字段 cn.taketoday.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

构造器概要

构造器

限定符	构造器	说明
protected	SourceFilteringListener(Object source)	Create a SourceFilteringListener for the given event source, expecting subclasses to override the onApplicationEventInternal(cn.taketoday.context.ApplicationEvent) method (instead of specifying a delegate listener).
	SourceFilteringListener(Object source, ApplicationListener<?> delegate)	Create a SourceFilteringListener for the given event source.

方法概要

修饰符和类型	方法	说明
String	getListenerId()	Return an optional identifier for the listener.
int	getOrder()	Determine this listener's order in a set of listeners for the same event.
void	onApplicationEvent(ApplicationEvent event)	Handle an application event.
protected void	onApplicationEventInternal(ApplicationEvent event)	Actually process the event, after having filtered according to the desired event source already.
boolean	supportsEventType(cn.taketoday.core.ResolvableType eventType)	Determine whether this listener actually supports the given event type.
boolean	supportsSourceType(Class<?> sourceType)	Determine whether this listener actually supports the given source type.

从类继承的方法 java.lang.Object

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

从接口继承的方法 cn.taketoday.context.event.GenericApplicationListener

supportsEventType

构造器详细资料

SourceFilteringListener

public SourceFilteringListener(Object source,
 ApplicationListener<?> delegate)

Create a SourceFilteringListener for the given event source.

参数:

source - the event source that this listener filters for, only processing events from this source

delegate - the delegate listener to invoke with event from the specified source

SourceFilteringListener

protected SourceFilteringListener(Object source)

Create a SourceFilteringListener for the given event source, expecting subclasses to override the onApplicationEventInternal(cn.taketoday.context.ApplicationEvent) method (instead of specifying a delegate listener).

参数:

source - the event source that this listener filters for, only processing events from this source

方法详细资料

onApplicationEvent

public void onApplicationEvent(ApplicationEvent event)

从接口复制的说明: ApplicationListener

Handle an application event.

指定者:

onApplicationEvent 在接口中 ApplicationListener<ApplicationEvent>

参数:

event - the event to respond to

supportsEventType

public boolean supportsEventType(cn.taketoday.core.ResolvableType eventType)

从接口复制的说明: GenericApplicationListener

Determine whether this listener actually supports the given event type.

指定者:

supportsEventType 在接口中 GenericApplicationListener

参数:

eventType - the event type (never null)

supportsSourceType

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

从接口复制的说明: SmartApplicationListener

Determine whether this listener actually supports the given source type.

The default implementation always returns true.

指定者:

supportsSourceType 在接口中 SmartApplicationListener

参数:

sourceType - the source type, or null if no source

getOrder

public int getOrder()

从接口复制的说明: SmartApplicationListener

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

The default implementation returns Ordered.LOWEST_PRECEDENCE.

指定者:

getOrder 在接口中 cn.taketoday.core.Ordered

指定者:

getOrder 在接口中 SmartApplicationListener

getListenerId

public String getListenerId()

从接口复制的说明: SmartApplicationListener

Return an optional identifier for the listener.

The default value is an empty String.

指定者:

getListenerId 在接口中 SmartApplicationListener

另请参阅:

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

onApplicationEventInternal

protected void onApplicationEventInternal(ApplicationEvent event)

Actually process the event, after having filtered according to the desired event source already.

The default implementation invokes the specified delegate, if any.

参数:

event - the event to process (matching the specified source)