first commit

libs/api/tracker/application/src/lib/event-handlers/issue-assigned.event-handler.ts

@@ -0,0 +1,27 @@
+import { EventsHandler, IEventHandler } from '@nestjs/cqrs';
+import { IssueAssignedEvent } from '@task-stream/api/tracker/domain';
+import { UpsertMaterializedIssueRepository } from '../ports/upsert-materialized-issue.repository';
+import { UserDirectory } from '../ports/user-directory';
+import { ReadModelNotifier, versionOf } from './read-model-notifier';
+
+@EventsHandler(IssueAssignedEvent)
+export class IssueAssignedEventHandler
+  implements IEventHandler<IssueAssignedEvent>
+{
+  constructor(
+    private readonly upsertMaterializedIssueRepository: UpsertMaterializedIssueRepository,
+    private readonly users: UserDirectory,
+    private readonly notifier: ReadModelNotifier,
+  ) {}
+
+  async handle(event: IssueAssignedEvent) {
+    const users = await this.users.refs([event.assigneeId]);
+    await this.upsertMaterializedIssueRepository.upsert({
+      id: event.aggregateId,
+      assignee: users.ofNullable(event.assigneeId),
+      updatedAt: event.occurredAt,
+      version: versionOf(event),
+    });
+    await this.notifier.issue(event.aggregateId, event);
+  }
+}