59 lines
2.2 KiB
C#
59 lines
2.2 KiB
C#
using MassTransit;
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using Musify.Application.Events;
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namespace Musify.Infrastructure.MassTransit.Sagas;
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public sealed class AlbumProcessingStateMachine : MassTransitStateMachine<AlbumProcessingState>
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{
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public State Processing { get; private set; } = null!;
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public State Failed { get; private set; } = null!;
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public Event<CreateAlbumResourcesEvent> ProcessingStarted { get; private set; } = null!;
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public Event<AlbumPictureProcessed> PictureProcessed { get; private set; } = null!;
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public Event<AlbumPictureProcessingFailed> PictureFailed { get; private set; } = null!;
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public AlbumProcessingStateMachine()
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{
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InstanceState(state => state.CurrentState);
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Event(() => ProcessingStarted, config => config.CorrelateById(context => context.Message.AlbumId));
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Event(() => PictureProcessed, config =>
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{
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config.CorrelateById(context => context.Message.AlbumId);
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config.OnMissingInstance(instance => instance.Discard());
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});
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Event(() => PictureFailed, config =>
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{
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config.CorrelateById(context => context.Message.AlbumId);
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config.OnMissingInstance(instance => instance.Discard());
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});
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Initially(
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When(ProcessingStarted)
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.Then(context =>
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{
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context.Saga.CreatedAt = DateTime.UtcNow;
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context.Saga.UpdatedAt = DateTime.UtcNow;
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context.Saga.Bucket = context.Message.Bucket;
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context.Saga.PictureKey = context.Message.PictureDestinationKey;
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})
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.TransitionTo(Processing));
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During(Processing,
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When(PictureProcessed).Finalize(),
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When(PictureFailed)
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.Then(context => context.Saga.UpdatedAt = DateTime.UtcNow)
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.TransitionTo(Failed)
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.Publish(context => new AlbumProcessingFailed(
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context.Saga.CorrelationId,
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context.Saga.Bucket,
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context.Saga.PictureKey)));
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During(Failed,
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Ignore(PictureProcessed),
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Ignore(PictureFailed));
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SetCompletedWhenFinalized();
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}
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}
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