public interface DeferrableUsed to decorate
EventListenerto denote whether the event for the listener can be deferred.
By default (without implementing
Deferrable), the event is sent to the server immediately when it is triggered at the client.
The deferrable events are used to improve the performance by minimizing the traffic between the clients and the server. It is usually used for event listeners that maintains the application states, rather than generating visual responses.
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