org.b3log.latke.event

Class AbstractEventQueue

java.lang.Object

org.b3log.latke.event.AbstractEventQueue

public abstract class AbstractEventQueue
extends Object

Abstract event queue(Observable).

Version:

1.0.0.3, Sep 16, 2018

Author:

Liang Ding

See Also:

AbstractEventListener

Constructor Summary

Constructors

Constructor and Description
AbstractEventQueue()

Method Summary

Modifier and Type	Method and Description
protected void	clearChanged() Indicates that this object has no longer changed, or that it has already notified all of its listeners of its most recent change, so that the hasChanged method will now return false.
int	countListeners() Returns the number of listeners of this Event queue object.
void	deleteListeners() Clears the listener list so that this object no longer has any listeners..
boolean	hasChanged() Tests if this object has changed.
void	notifyListeners() If this object has changed, as indicated by the hasChanged method, then notify all of its listeners and then call the clearChanged method to indicate that this object has no longer changed.
void	notifyListeners(Event<?> event) Notifies all listeners of this event queue to perform action.
protected void	setChanged() Marks this Event queue object as having been changed, the hasChanged method will now return true.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractEventQueue

public AbstractEventQueue()

Method Detail

notifyListeners

public void notifyListeners()

If this object has changed, as indicated by the hasChanged method, then notify all of its listeners and then call the clearChanged method to indicate that this object has no longer changed.

See Also:

AbstractEventListener.performAction(org.b3log.latke.event.AbstractEventQueue, org.b3log.latke.event.Event)

notifyListeners

public void notifyListeners(Event<?> event)

Notifies all listeners of this event queue to perform action.

If this event queue object has changed, as indicated by the hasChanged method, then notify all of its listeners and then call the clearChanged method to indicate that this object has no longer changed.

Parameters:

event - the specified event

See Also:

AbstractEventListener.performAction(org.b3log.latke.event.AbstractEventQueue, org.b3log.latke.event.Event)

deleteListeners

public void deleteListeners()

Clears the listener list so that this object no longer has any listeners..

setChanged

protected void setChanged()

Marks this Event queue object as having been changed, the hasChanged method will now return true.

clearChanged

protected void clearChanged()

Indicates that this object has no longer changed, or that it has already notified all of its listeners of its most recent change, so that the hasChanged method will now return false. This method is called automatically by the notifyListeners methods.

See Also:

notifyListeners(), notifyListeners(org.b3log.latke.event.Event)

hasChanged

public boolean hasChanged()

Tests if this object has changed.

Returns:

true if and only if the setChanged method has been called more recently than the clearChanged method on this object; false otherwise

See Also:

clearChanged(), setChanged()

countListeners

public int countListeners()

Returns the number of listeners of this Event queue object.

Returns:

the number of listeners of this object.