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feat(domain): implement the Registration aggregate invariants (refs #6)

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Submit requires a bsn and starts the aggregate in INGEDIEND; the started
process-instance id is recorded; AttachZaak stores the ACL's zaak URL,
tolerating a duplicate (at-least-once worker delivery) and rejecting a
conflicting URL, without advancing the status.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Niek Otten
2026-06-30 16:56:31 +02:00
parent cc9e7852e1
commit 53751fd1bc
2 changed files with 25 additions and 7 deletions
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30
services/domain/Big.Domain/Registration.cs
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@@ -7,8 +7,6 @@ namespace Big.Domain;
/// </summary>
public sealed class Registration
{
// STUB (red): mutators are no-ops and Submit leaves the bsn empty so the behaviour tests
// compile and fail on their assertions. The green commit implements the invariants.
private Registration(RegistrationId id, string bsn)
{
Id = id;
@@ -31,17 +29,37 @@ public sealed class Registration
public Uri? ZaakUrl { get; private set; }
/// <summary>Submit a new registration. It begins in <see cref="RegistrationStatus.Ingediend"/>.</summary>
public static Registration Submit(string bsn) => new(RegistrationId.New(), string.Empty);
public static Registration Submit(string bsn)
{
ArgumentException.ThrowIfNullOrWhiteSpace(bsn);
return new Registration(RegistrationId.New(), bsn);
}
/// <summary>Record that the registratie workflow process has been started for this registration.</summary>
public void RecordProcessStarted(string processInstanceId)
{
// STUB (red).
ArgumentException.ThrowIfNullOrWhiteSpace(processInstanceId);
ProcessInstanceId = processInstanceId;
}
/// <summary>Attach the zaak the ACL opened. Idempotent on the same URL; a conflicting URL is rejected.</summary>
/// <summary>
/// Attach the zaak the ACL opened. The external-task worker may deliver the same job more than
/// once (at-least-once), so re-attaching the identical URL is a no-op; a different URL signals a
/// genuine conflict and is rejected. The status stays <see cref="RegistrationStatus.Ingediend"/>:
/// opening the zaak does not advance the registration's lifecycle in this slice.
/// </summary>
public void AttachZaak(Uri zaakUrl)
{
// STUB (red).
ArgumentNullException.ThrowIfNull(zaakUrl);
if (ZaakUrl is not null)
{
if (ZaakUrl != zaakUrl)
throw new InvalidOperationException(
$"Registration {Id} already has zaak {ZaakUrl}; cannot attach a different zaak {zaakUrl}.");
return;
}
ZaakUrl = zaakUrl;
}
}