public EventBus getEventBus() {
        return eventBus;
    }
Returns the {@code EventBus} used by this SecurityManager and potentially any of its children components.

@return the {@code EventBus} used by this SecurityManager and potentially any of its children components.
@since 1.3
core/src/main/java/org/apache/shiro/mgt/CachingSecurityManager.java