Package io.jmix.core.common.event

Class EventHub

java.lang.Object

io.jmix.core.common.event.EventHub

public class EventHub
extends Object

EventHub class implementing the event listening model with concrete event classes.

This class is not thread-safe and should not be accessed concurrently from multiple threads without proper synchronization. * This class is not thread-safe and should not be accessed concurrently from multiple threads without proper synchronization.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	EventHub.SubscriptionImpl<E>

Field Summary

Fields

Modifier and Type	Field	Description
protected static final Consumer[]	EMPTY_LISTENERS_ARRAY
protected Map<Class<?>,Consumer[]>	events
protected static final int	EVENTS_MAP_EXPECTED_MAX_SIZE

Constructor Summary

Constructors

Constructor	Description
EventHub()

Method Summary

Modifier and Type	Method	Description
<E> boolean	hasSubscriptions(Class<E> eventType)	Check if there are listeners for event type E.
protected Consumer[]	newListenersArray(int length)
<E> void	publish(Class<E> eventType, E event)	Fire listeners for event type E.
<E> Subscription	subscribe(Class<E> eventType, Consumer<E> listener)	Add an event listener for event with type E.
void	unsubscribe(Class<?> eventType)	Remove all listeners with the specified event type.
<E> boolean	unsubscribe(Class<E> eventType, Consumer<E> listener)	Remove an event listener for event with type E.

Methods inherited from class java.lang.Object

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

Field Details

EVENTS_MAP_EXPECTED_MAX_SIZE

protected static final int EVENTS_MAP_EXPECTED_MAX_SIZE

See Also:

• Constant Field Values

EMPTY_LISTENERS_ARRAY

protected static final Consumer[] EMPTY_LISTENERS_ARRAY

events

protected Map<Class<?>,Consumer[]> events

Constructor Details

EventHub

public EventHub()

Method Details

subscribe

public <E> Subscription subscribe(Class<E> eventType,
 Consumer<E> listener)

Add an event listener for event with type E.

Type Parameters:

E - type of event

Parameters:

eventType - event class

listener - listener

Returns:

subscription object

unsubscribe

public <E> boolean unsubscribe(Class<E> eventType,
 Consumer<E> listener)

Remove an event listener for event with type E.

Type Parameters:

E - type of event

Parameters:

eventType - event class

listener - listener

Returns:

true if listener has been removed

unsubscribe

public void unsubscribe(Class<?> eventType)

Remove all listeners with the specified event type.

Parameters:

eventType - event type

hasSubscriptions

public <E> boolean hasSubscriptions(Class<E> eventType)

Check if there are listeners for event type E.

Type Parameters:

E - type of event

Parameters:

eventType - event class

Returns:

true if there are one or more listeners for type E

publish

public <E> void publish(Class<E> eventType,
 E event)

Fire listeners for event type E.

Type Parameters:

E - type of event

Parameters:

eventType - event class

event - event object

newListenersArray

protected Consumer[] newListenersArray(int length)