com.haulmont.bali.events

Class EventHub

java.lang.Object

com.haulmont.bali.events.EventHub

@NotThreadSafe
public class EventHub
extends java.lang.Object

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

Nested Class Summary

Nested Classes

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

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.util.function.Consumer[]	EMPTY_LISTENERS_ARRAY
protected java.util.Map<java.lang.Class<?>,java.util.function.Consumer[]>	events
protected static int	EVENTS_MAP_EXPECTED_MAX_SIZE

Constructor Summary

Constructors

Constructor and Description
EventHub()

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

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 java.util.function.Consumer[] EMPTY_LISTENERS_ARRAY

events

protected java.util.Map<java.lang.Class<?>,java.util.function.Consumer[]> events

Constructor Detail

EventHub

public EventHub()

Method Detail

subscribe

public <E> Subscription subscribe(java.lang.Class<E> eventType,
                                  java.util.function.Consumer<E> listener)

Add an event listener for events with type E.

Type Parameters:

E - type of event

Parameters:

eventType - event class

listener - listener

Returns:

subscription object

unsubscribe

public <E> boolean unsubscribe(java.lang.Class<E> eventType,
                               java.util.function.Consumer<E> listener)

Remove an event listener for events 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(java.lang.Class<?> eventType)

Remove all listeners with the specified event type.

Parameters:

eventType - event type

hasSubscriptions

public <E> boolean hasSubscriptions(java.lang.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(java.lang.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 java.util.function.Consumer[] newListenersArray(int length)