org.gcube.common.events.impl

Class DefaultHub

java.lang.Object

org.gcube.common.events.impl.DefaultHub

All Implemented Interfaces:

Hub

public class DefaultHub
extends Object
implements Hub

Default Hub implementation.

Author:

Fabio Simeoni

Constructor Summary

Constructors

Constructor and Description
DefaultHub()
DefaultHub(ExecutorService service)

Method Summary

Modifier and Type	Method and Description
void	fire(Object event, String... qualifiers) Fires an event to all observers which have subscribed for them, blocking the client until all the critical observers have executed.
void	stop() Signals that this hub is no longer needed and can release its resources.
void	subscribe(Object object) Subscribes an observer for notification of events of a given type.
boolean	unsubscribe(Object observer) Unsubscribes an observer.
void	waitFor(Class<?> eventType) Blocks the caller until an event of a given type occurs.
void	waitFor(Class<?> eventType, long duration, TimeUnit unit) Blocks the caller until an event of a given type occurs or a given length of time elapses.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultHub

public DefaultHub()

DefaultHub

public DefaultHub(ExecutorService service)

Method Detail

subscribe

public void subscribe(Object object)

Description copied from interface: Hub

Subscribes an observer for notification of events of a given type.

The single parameter of any method of the observer annotated with Observes identifies the type of the events observed by the observer.

Specified by:

subscribe in interface Hub

Parameters:

object - the observer

See Also:

Observes

unsubscribe

public boolean unsubscribe(Object observer)

Description copied from interface: Hub

Unsubscribes an observer.

Specified by:

unsubscribe in interface Hub

Parameters:

observer - the observer

Returns:

true if the observer is found and unsubscribed.

fire

public void fire(Object event,
                 String... qualifiers)

Description copied from interface: Hub

Fires an event to all observers which have subscribed for them, blocking the client until all the critical observers have executed.

Specified by:

fire in interface Hub

Parameters:

event - the event

qualifiers - optional event qualifiers

waitFor

public void waitFor(Class<?> eventType)

Description copied from interface: Hub

Blocks the caller until an event of a given type occurs.

Specified by:

waitFor in interface Hub

Parameters:

eventType - the event type

waitFor

public void waitFor(Class<?> eventType,
                    long duration,
                    TimeUnit unit)

Description copied from interface: Hub

Blocks the caller until an event of a given type occurs or a given length of time elapses.

Specified by:

waitFor in interface Hub

Parameters:

eventType - the event type

duration - the length of time to wait for

unit - the time unit of the duration

stop

public void stop()

Description copied from interface: Hub

Signals that this hub is no longer needed and can release its resources.

Specified by:

stop in interface Hub