Niek Otten
566fc9bcea
On each notification the subscriber reads the zaak's reference (identificatie) through the ACL — the only code allowed to talk to ZGW (§8.1) — and persists it on the register_projection row and in the processed_notifications replay log. Storing it in the log keeps rebuild log-only (ADR-0008): no ACL/ZGW access on rebuild. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
46 lines
2.3 KiB
C#
46 lines
2.3 KiB
C#
namespace EventSubscriber.Application;
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/// <summary>
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/// Projects inbound NRC notifications into the read projection. Tolerates duplicate and
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/// out-of-order deliveries (CLAUDE.md §8.6): the notification log dedups, and the projection
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/// upsert is idempotent on the zaak id. Rebuilds the projection by replaying the log.
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/// </summary>
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public sealed class NotificationProjector(INotificationLog log, IProjectionStore store, IAclClient acl)
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{
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/// <summary>Handle one inbound notification. Reacts to a zaak being created (INGEDIEND) and a
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/// status being set (INGESCHREVEN); ignores everything else. Enriches the row with the zaak's
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/// reference via the ACL (§8.1) and records it so a rebuild needs no ZGW access (#78).</summary>
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public async Task HandleAsync(Notification notification, CancellationToken ct = default)
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{
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if (!notification.IsZaakCreated && !notification.IsZaakStatusSet)
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return;
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var reference = await acl.GetZaakReferenceAsync(notification.ZaakUrl, ct);
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var recorded = new RecordedNotification(
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notification.IdempotencyKey, notification.Actie, notification.ZaakId, notification.Resource, reference);
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// Atomic record-or-skip: a duplicate (or concurrent) delivery is recognised and dropped
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// before it touches the projection, so the projection stays a faithful derived artefact.
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if (!await log.TryRecordAsync(recorded, ct))
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return;
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await store.UpsertAsync(ToEntry(recorded), ct);
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}
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/// <summary>Rebuild the projection from the durable notification log (PRD §8.4).</summary>
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public async Task RebuildAsync(CancellationToken ct = default)
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{
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await store.ClearAsync(ct);
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foreach (var recorded in await log.AllAsync(ct))
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await store.UpsertAsync(ToEntry(recorded), ct);
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}
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/// <summary>The projection row for an accepted notification: a status-set maps to INGESCHREVEN,
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/// a zaak-create to INGEDIEND. bsn/naam are deferred (ADR-0008).</summary>
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private static RegisterEntry ToEntry(RecordedNotification recorded)
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=> new(
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recorded.ZaakId,
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recorded.Resource == "status" ? RegistrationStatus.Ingeschreven : RegistrationStatus.Ingediend,
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Reference: recorded.Reference);
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}
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