Package io.microsphere.event

Interface EventListener<E extends Event>

Type Parameters:

E - the concrete class of Event

All Superinterfaces:

java.lang.Comparable<Prioritized>, java.util.EventListener, Prioritized

All Known Subinterfaces:

ConditionalEventListener<E>, FileChangedListener

All Known Implementing Classes:

GenericEventListener, LoggingFileChangedListener

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface EventListener<E extends Event>
extends java.util.EventListener, Prioritized

The Event Listener that is based on Java standard EventListener interface supports the generic Event.

The handle method will be notified when the matched-type Event is published, whose priority could be changed by getPriority() method.

Since:

1.0.0

See Also:

Event, EventListener

Field Summary

Fields inherited from interface io.microsphere.lang.Prioritized

COMPARATOR, MAX_PRIORITY, MIN_PRIORITY, NORMAL_PRIORITY

Method Summary

Modifier and Type	Method	Description
static java.lang.Class<? extends Event>	findEventType(EventListener<?> listener)	Find the type event from the specified event listener
static java.lang.Class<? extends Event>	findEventType(java.lang.Class<?> listenerClass)	Find the type event from the specified event listener
static java.lang.Class<? extends Event>	findEventType(java.lang.reflect.ParameterizedType parameterizedType)	Find the type event from the specified ParameterizedType presents a class of event listener
default int	getPriority()	The priority of current listener.
void	onEvent(E event)	Handle a Event when it's be published

Methods inherited from interface io.microsphere.lang.Prioritized

compareTo

Method Detail

findEventType

static java.lang.Class<? extends Event> findEventType(EventListener<?> listener)

Find the type event from the specified event listener

Parameters:

listener - the class of event listener

Returns:

null if not found

findEventType

static java.lang.Class<? extends Event> findEventType(java.lang.Class<?> listenerClass)

Find the type event from the specified event listener

Parameters:

listenerClass - the class of event listener

Returns:

null if not found

findEventType

static java.lang.Class<? extends Event> findEventType(java.lang.reflect.ParameterizedType parameterizedType)

Find the type event from the specified ParameterizedType presents a class of event listener

Parameters:

parameterizedType - the ParameterizedType presents a class of event listener

Returns:

null if not found

onEvent

void onEvent(E event)

Handle a Event when it's be published

Parameters:

event - a Event

getPriority

default int getPriority()

The priority of current listener.

Specified by:

getPriority in interface Prioritized

Returns:

the value is more greater, the priority is more lower. Integer.MIN_VALUE indicates the highest priority. The default value is Integer.MAX_VALUE. The comparison rule , refer to Prioritized.compareTo(io.microsphere.lang.Prioritized).