/// <summary>
/// Ensures workflow timers are registered for waking the instance up.
/// </summary>
/// <returns></returns>
async Task SaveReminderAsync()
{
// next date at which the reminder should be invoked
var dueDate = (DateTime?)state.GetInstanceData(ActivityTimerExpirationTimeKey) ?? DateTime.MinValue;
if (dueDate != DateTime.MinValue)
{
// lock down current time
var nowDate = DateTime.UtcNow;
// don't allow dates in the past
if (dueDate < nowDate)
{
dueDate = nowDate;
}
// unregister reminder if it the time has changed
var reminder = actor.TryGetReminder(ActivityTimerExpirationReminderName);
if (reminder != null)
{
// deserialize last due date from reminder
var lastDueDate = DateTime.FromBinary(BitConverter.ToInt64(reminder.State, 0));
if (lastDueDate != dueDate)
{
// timer is out of range, will reschedule below
await actor.UnregisterReminderAsync(reminder);
reminder = null;
}
}
// schedule new reminder
if (reminder == null)
{
await actor.RegisterReminderAsync(
ActivityTimerExpirationReminderName,
BitConverter.GetBytes(dueDate.ToBinary()),
(dueDate - nowDate).Max(TimeSpan.FromMilliseconds(100)),
TimeSpan.FromMilliseconds(-1));
}
}
else
{
// no reminder required, unregister existing reminder
var reminder = actor.TryGetReminder(ActivityTimerExpirationReminderName);
if (reminder != null)
{
await actor.UnregisterReminderAsync(reminder);
}
}
}
/// <summary>
/// Loads the instance data for the given instance ID.
/// </summary>
/// <param name="instanceId"></param>
/// <returns></returns>
IDictionary <XName, InstanceValue> LoadInstanceData(Guid instanceId)
{
return(state.GetInstanceDataNames().ToDictionary(i => (XName)i, i => new InstanceValue(FromSerializableObject(state.GetInstanceData(i)))));
}