[Enhancement] AbstractSubscriber class should be designed as interface.

[2084276225]

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• I had searched in the issues and found no similar issues.

Enhancement Request

public abstract class AbstractSubscriber {

/**
 * Event callback.
 *
 * @param event
 */
public abstract void onEvent(T event);

/**
 * Type of this subscriber's subscription.
 *
 * @return
 */
public abstract Class<? extends AbstractEvent> subscribeType();

/**
 * Executor.
 *
 * @return executor
 */
public Executor executor() {
    return null;
}

}

Describe the solution you'd like

I think this AbstractSubscriber class should be designed as interface，such as Map interface and AbstractMap class

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

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