protected virtual void ClearCacheFor(Subscription[] subscriptions)
        {
            foreach (var subscription in subscriptions)
            {
                SubscriptionCacheRegion.ExpireSubscription(subscription);
            }

            SubscriptionSearchCacheRegion.ExpireRegion();
        }
 protected virtual void ClearCache()
 {
     SubscriptionCacheRegion.ExpireRegion();
     SubscriptionSearchCacheRegion.ExpireRegion();
 }