57 lines
1.6 KiB
C#
57 lines
1.6 KiB
C#
using Femto.Common.Domain;
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using MediatR;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Logging;
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namespace Femto.Common.Infrastructure;
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public class SaveChangesPipelineBehaviour<TRequest, TResponse>(
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DbContext context,
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IPublisher publisher,
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ILogger<SaveChangesPipelineBehaviour<TRequest, TResponse>> logger
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) : IPipelineBehavior<TRequest, TResponse>
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where TRequest : notnull
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{
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public async Task<TResponse> Handle(
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TRequest request,
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RequestHandlerDelegate<TResponse> next,
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CancellationToken cancellationToken
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)
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{
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var response = await next(cancellationToken);
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if (context.ChangeTracker.HasChanges())
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{
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await this.EmitDomainEvents(cancellationToken);
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logger.LogDebug("saving changes");
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await context.SaveChangesAsync(cancellationToken);
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}
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return response;
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}
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private async Task EmitDomainEvents(CancellationToken cancellationToken)
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{
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var domainEvents = context
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.ChangeTracker.Entries<Entity>()
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.SelectMany(e =>
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{
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var events = e.Entity.DomainEvents;
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e.Entity.ClearDomainEvents();
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return events;
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})
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.ToList();
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logger.LogTrace("loaded {Count} domain events", domainEvents.Count);
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foreach (var domainEvent in domainEvents)
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{
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logger.LogTrace(
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"publishing {Type} domain event {Id}",
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domainEvent.GetType().Name,
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domainEvent.EventId
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);
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await publisher.Publish(domainEvent, cancellationToken);
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}
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}
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}
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