Sending Subscription Notifications

gistfile1.cs

        /// <summary>
        /// Determines whether a notification is due in the given <param name="period"/>.
        /// </summary>
        /// <param name="period">The notification period to check.</param>
        /// <returns>True if a notification is due, otherwise False.</returns>
        public bool IsNotificationDue(TimeSpan period)
        {
            Ensure.Argument.NotNull(period, "period");

            var periodStart = NextRenewalDate - period;

            if (periodStart <= DateTime.UtcNow)
            {
                // this notification period has started

                if (NotificationSentDate == null || NotificationSentDate < periodStart)
                {
                    // we've not yet sent this notification or a later one has already been sent
                    return true;
                }
            }          

            return false;
        }