public DateTime NextScheduledAtUtc(DateTime lastScheduledAtUtc, ScheduledMessageRecurrenceEnum recurrenceType)
{
if (recurrenceType == ScheduledMessageRecurrenceEnum.DoesNotRecur)
{
throw new NotSupportedException("Only daily recurrence is currently supported");
}
if (Calculators.TryGetValue(recurrenceType, out var adjustmentFunc))
{
return(adjustmentFunc(lastScheduledAtUtc));
}
throw new NotSupportedException($"Recurrence type {recurrenceType} has no registered calculator");
}
public async Task <string> ScheduleCommand(ScheduledMessageRecurrenceEnum frequency, ICommand <bool> command, DateTime?initialExecutionDateTimeUtc, string optionalMessageId = null)
{
if (command == null)
{
throw new ArgumentNullException(nameof(command));
}
if (initialExecutionDateTimeUtc.HasValue && initialExecutionDateTimeUtc < DateTime.UtcNow)
{
throw new ArgumentException("Commands cannot be scheduled to run in the past");
}
if (frequency == ScheduledMessageRecurrenceEnum.DoesNotRecur && !initialExecutionDateTimeUtc.HasValue)
{
throw new ArgumentException("A one off command must have an execution date", nameof(initialExecutionDateTimeUtc));
}
ScheduledMessage message = CreateScheduledMessage(command, initialExecutionDateTimeUtc, optionalMessageId, frequency);
await PostMessage(initialExecutionDateTimeUtc, message);
return(message.Id);
}
private static ScheduledMessage CreateScheduledMessage(ICommand <bool> command,
DateTime?initialExecutionDateTimeUtc,
string optionalMessageId, ScheduledMessageRecurrenceEnum frequency)
{
DateTime scheduledAt = initialExecutionDateTimeUtc ?? DateTime.UtcNow;
string messageId = string.IsNullOrWhiteSpace(optionalMessageId) ? Guid.NewGuid().ToString() : optionalMessageId;
string wrappedCommandJson = JsonConvert.SerializeObject(command);
return(new ScheduledMessage
{
Id = messageId,
LastScheduledAtUtc = null,
LastExecutedAtUtc = null,
Recurrence = frequency,
ScheduledAtUtc = scheduledAt,
WrappedCommandFullTypeName = command.GetType().FullName,
WrappedCommandJson = wrappedCommandJson
});
}