Domain Event Generator

GenerateDomainEventDispatcherAttribute creates a typed DomainEventDispatcher<TEventBase> factory from attributed handler methods.

[GenerateDomainEventDispatcher(typeof(OrderDomainEvent), FactoryName = "CreateDispatcher", DispatcherName = "order-domain-events")]
public static partial class GeneratedOrderDomainEvents
{
    [DomainEventHandler(typeof(OrderPlaced), 10)]
    private static ValueTask Project(OrderPlaced domainEvent, CancellationToken cancellationToken)
    {
        projection.Apply(domainEvent);
        return ValueTask.CompletedTask;
    }
}

The generated factory is equivalent to:

DomainEventDispatcher<OrderDomainEvent>
    .Create("order-domain-events")
    .Handle<OrderPlaced>(Project)
    .Build();

Handlers are grouped by event type and ordered by the order argument on [DomainEventHandler].

Diagnostics:

• PKDE001: host type must be partial.
• PKDE002: at least one [DomainEventHandler] method is required.
• PKDE003: handler must be static and return ValueTask from (TEvent, CancellationToken), and the event type must derive from the dispatcher base event type.
• PKDE004: handler order values must be unique per event type.