public String getActiveSessionsCacheName() {
        return activeSessionsCacheName;
    }
Returns the name of the actives sessions cache to be returned by the {@code CacheManager}.  Unless
overridden by {@link #setActiveSessionsCacheName(String)}, defaults to {@link #ACTIVE_SESSION_CACHE_NAME}.

@return the name of the active sessions cache.
core/src/main/java/org/apache/shiro/session/mgt/eis/CachingSessionDAO.java