refactor(jobs): modularize background job handlers

Tiku.Infrastructure/Content/Imports/ContentImportJobHandler.cs

@@ -0,0 +1,48 @@
+using System.Text.Json;
+using Tiku.Application.Content;
+using Tiku.Application.Jobs;
+using Tiku.Infrastructure.Jobs;
+
+namespace Tiku.Infrastructure.Content.Imports;
+
+internal sealed class ContentImportJobHandler(IDirectContentService directContentService) : IBackgroundJobHandler
+{
+    public string JobType => "content_import";
+
+    public async Task<BackgroundJobHandlerResult> HandleAsync(
+        BackgroundJobExecutionContext context,
+        CancellationToken cancellationToken = default)
+    {
+        var createdBy = BackgroundJobPayload.GetGuid(context.Payload, "createdBy") ?? Guid.Empty;
+        if (createdBy == Guid.Empty) throw new InvalidOperationException("content_import job requires createdBy.");
+
+        var command = new SimpleImportCommand(
+            BackgroundJobPayload.GetString(context.Payload, "importType") ??
+            throw new InvalidOperationException("content_import job requires importType."),
+            BackgroundJobPayload.GetString(context.Payload, "sourceFormat"),
+            BackgroundJobPayload.GetString(context.Payload, "sourceName"),
+            BackgroundJobPayload.GetGuid(context.Payload, "regionId"),
+            BackgroundJobPayload.GetGuid(context.Payload, "entryId"),
+            BackgroundJobPayload.GetGuid(context.Payload, "contentNodeId"),
+            BackgroundJobPayload.GetGuid(context.Payload, "subjectId"),
+            BackgroundJobPayload.GetGuid(context.Payload, "categoryId"),
+            BackgroundJobPayload.GetGuid(context.Payload, "questionBankId"),
+            BackgroundJobPayload.GetGuid(context.Payload, "collectionId"),
+            BackgroundJobPayload.GetArray(context.Payload, "items"),
+            false);
+        var result = await directContentService.ExecuteImportAsync(
+            new DirectContentActor(context.TenantId, createdBy),
+            command,
+            cancellationToken);
+        return new BackgroundJobHandlerResult(JsonSerializer.SerializeToElement(new
+        {
+            importJobId = result.Job.Id,
+            result.Job.ImportType,
+            result.Job.Status,
+            result.Job.TotalCount,
+            result.Job.InsertedCount,
+            result.Job.UpdatedCount,
+            result.Job.ErrorCount
+        }));
+    }
+}