internal static void Perform <TCommand>(this IAggregateRoot aggregate, TCommand command)
{
var subscription = AggregateInvokersCache.GetWhenMethod(aggregate.GetType(), command.GetType());
if (subscription == null)
{
throw new InvalidOperationException("Aggregate can't perform command.");
}
if (aggregate.Status == RootStatus.New && !subscription.IsConstructor)
{
throw new InvalidOperationException("Attempting to apply a command to non existed aggregate.");
}
if (aggregate.Status != RootStatus.New && subscription.IsConstructor)
{
throw new InvalidOperationException("Attempting to create existed aggregate.");
}
if (aggregate.Status == RootStatus.Archived)
{
throw new InvalidOperationException("Aggregate is archived.");
}
subscription.Invoker(aggregate, command);
if (aggregate.Changes.Count < 1)
{
throw new InvalidOperationException($"Command '{command.GetType().AssemblyQualifiedName}' produced no events");
}
aggregate.Status = RootStatus.Alive;
aggregate.Reel(aggregate.Changes);
if (subscription.IsDestructor)
{
aggregate.Status = RootStatus.Archived;
}
}
private static void ApplyOnState(this IAggregateRoot root, object evnt)
{
StateOnMethod subscription = AggregateInvokersCache.GetStateOnMethod(root.State.GetType(), evnt.GetType());
subscription?.Invoker(root.State, evnt);
}