SenseNet.Messaging.NotificationHandler.CollectEventsPerSubscription C# (CSharp) Method

        private static IEnumerable<Subscription> CollectEventsPerSubscription(NotificationFrequency freq, DateTime now)
        {
            var lastTime = now;
            var subscriptions = Subscription.GetActiveSubscriptionsByFrequency(freq);
            if (subscriptions.Count() == 0)
                return null;
            //var time = GetTimeLimit(freq);
            var time = LastProcessTime.GetLastProcessTime(freq);

            using (var context = new DataHandler())
            {
                var events = (time == DateTime.MinValue)?
                    context.Events.Where(x => x.When <= lastTime) :
                    context.Events.Where(x => x.When > time && x.When <= lastTime);
                foreach (var @event in events.OrderBy(x => x.When))
                    foreach (var subscription in subscriptions)
                        if (IsRelatedPath(@event.ContentPath, subscription.ContentPath))
                            if (HasPermission(subscription, @event))
                                subscription.AddRelatedEvent(@event);
            }
            LastProcessTime.SetLastProcessTime(freq, lastTime);
            return subscriptions;
        }