Mccn/src/Modules/Users/Mccn.Modules.Users.Infrastructure/Outbox/ProcessOutboxJob.cs

using System.Reflection;
using System.Text.Json;
using Mccn.Common.Application.EventBus;
using Mccn.Common.Domain.Abstractions;
using Mccn.Common.Infrastructure.Outbox;
using Mccn.Modules.Users.Domain.Users;
using Mccn.Modules.Users.Infrastructure.Database;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Quartz;

namespace Mccn.Modules.Users.Infrastructure.Outbox;

[DisallowConcurrentExecution]
internal sealed class ProcessOutboxJob(
    UsersDbContext dbContext,
    IServiceScopeFactory serviceScopeFactory,
    ILogger<ProcessOutboxJob> logger) : IJob
{
    private static readonly Assembly DomainAssembly = typeof(User).Assembly;

    public async Task Execute(IJobExecutionContext context)
    {
        List<OutboxMessage> messages = await dbContext.OutboxMessages
            .Where(m => m.ProcessedOnUtc == null)
            .OrderBy(m => m.OccurredOnUtc)
            .Take(20)
            .ToListAsync(context.CancellationToken);

        foreach (OutboxMessage message in messages)
        {
            try
            {
                Type? eventType = DomainAssembly.GetTypes()
                    .FirstOrDefault(t => t.Name == message.Type);

                if (eventType is null)
                {
                    logger.LogWarning("Could not find domain event type {Type}", message.Type);
                    message.ProcessedOnUtc = DateTime.UtcNow;
                    message.Error = $"Unknown domain event type: {message.Type}";
                    continue;
                }

                IDomainEvent? domainEvent = (IDomainEvent?)JsonSerializer.Deserialize(message.Content, eventType);

                if (domainEvent is null)
                {
                    message.ProcessedOnUtc = DateTime.UtcNow;
                    message.Error = "Failed to deserialize domain event.";
                    continue;
                }

                using IServiceScope scope = serviceScopeFactory.CreateScope();

                Type handlerInterfaceType = typeof(IDomainEventHandler<>).MakeGenericType(eventType);

                IEnumerable<IDomainEventHandler> handlers = scope.ServiceProvider
                    .GetServices(handlerInterfaceType)
                    .Cast<IDomainEventHandler>();

                foreach (IDomainEventHandler handler in handlers)
                    await handler.Handle(domainEvent, context.CancellationToken);

                message.ProcessedOnUtc = DateTime.UtcNow;
            }
            catch (Exception ex)
            {
                logger.LogError(ex, "Error processing outbox message {MessageId}", message.Id);
                message.Error = ex.Message;
                message.ProcessedOnUtc = DateTime.UtcNow;
            }
        }

        await dbContext.SaveChangesAsync(context.CancellationToken);
    }
}