/// <summary>
/// Schedules the specified command.
/// </summary>
/// <param name="scheduledCommand">The scheduled command.</param>
/// <returns>
/// A task that is complete when the command has been successfully scheduled.
/// </returns>
/// <exception cref="System.NotSupportedException">Non-immediate scheduling is not supported.</exception>
public virtual async Task Schedule(IScheduledCommand <TAggregate> scheduledCommand)
{
if (scheduledCommand.Result is CommandDeduplicated)
{
return;
}
if (scheduledCommand.Command.CanBeDeliveredDuringScheduling() && scheduledCommand.IsDue())
{
if (!await PreconditionHasBeenMet(scheduledCommand))
{
CommandScheduler.DeliverIfPreconditionIsMetSoon(
scheduledCommand,
Configuration.Current);
}
else
{
// resolve the command scheduler so that delivery goes through the whole pipeline
await Configuration.Current.CommandScheduler <TAggregate>().Deliver(scheduledCommand);
return;
}
}
if (scheduledCommand.Result == null)
{
throw new NotSupportedException("Deferred scheduling is not supported by the current command scheduler pipeline configuration.");
}
}
/// <summary>
/// Schedules a command for asynchronous and, optionally, deferred delivery.
/// </summary>
/// <typeparam name="TCommand">The type of the command.</typeparam>
/// <param name="command">The command.</param>
/// <param name="due">The time when the command should be delivered. If this is null, the scheduler will deliver it as soon as possible.</param>
/// <exception cref="System.ArgumentNullException">command</exception>
protected void ScheduleCommand <TCommand>(TCommand command,
DateTimeOffset?due = null)
where TCommand : class, ICommand <T>
{
if (command == null)
{
throw new ArgumentNullException("command");
}
var scheduled = CommandScheduler.CreateScheduledCommand <TCommand, T>(
Id,
command,
due) as CommandScheduled <T>;
RecordEvent(scheduled);
}
// TODO: (CommandSchedulerExtensions) combine with CommandScheduler class
public static async Task <IScheduledCommand <TAggregate> > Schedule <TCommand, TAggregate>(
this ICommandScheduler <TAggregate> scheduler,
Guid aggregateId,
TCommand command,
DateTimeOffset?dueTime = null,
IEvent deliveryDependsOn = null)
where TCommand : ICommand <TAggregate>
where TAggregate : IEventSourced
{
if (aggregateId == Guid.Empty)
{
throw new ArgumentException("Parameter aggregateId cannot be an empty Guid.");
}
var scheduledCommand = CommandScheduler.CreateScheduledCommand <TCommand, TAggregate>(
aggregateId,
command,
dueTime,
deliveryDependsOn);
await scheduler.Schedule(scheduledCommand);
return(scheduledCommand);
}
