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public interface EventBus {
    /**
     * publish an event on to the event bus
     *
     * @param event event that needs to be published on the event bus
     */
    void publish(Event event) throws EventBusException;
    /**
     * subscribe to events that matches specified event topics
     *
     * @param topic defines category and type of the events being subscribed to
     * @param subscriber subscriber that intends to receive event notification
     * @return UUID returns the subscription ID
     */
    UUID subscribe(EventTopic topic, EventSubscriber subscriber) throws EventBusException;
    /**
     * unsubscribe to events of a category and a type
     *
     * @param subscriber subscriber that intends to unsubscribe from the event notification
     */
    void unsubscribe(UUID subscriberId, EventSubscriber subscriber) throws EventBusException;
}

public interface EventSubscriber {
    /**
     * Callback method. EventBus calls this method on occurrence of subscribed event
     *
     * @param event details of the event
     */
    void onEvent(Event event);
}