54 lines
2.1 KiB
C#
54 lines
2.1 KiB
C#
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using SIGCM2.Application.Abstractions;
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using SIGCM2.Application.Abstractions.Persistence;
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using SIGCM2.Domain.Exceptions;
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namespace SIGCM2.Application.PuntosDeVenta.Reservar;
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/// <summary>
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/// Reserva el próximo número correlativo para (PdvId × TipoComprobante) ejecutando
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/// usp_ReservarNumeroComprobante vía el repositorio.
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///
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/// NOTAS DE DISEÑO (AD4, AD9):
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/// - NO se envuelve en TransactionScope: el SP ya es atómico bajo SERIALIZABLE.
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/// Un TransactionScope ambiente aquí escalaría a DTC → innecesario.
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/// - NO usa Polly: no está en el proyecto. Retry deadlock con bucle simple.
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/// - Infrastructure traduce SqlException 1205 → DeadlockTransientException.
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/// - Backoff en ms: [50, 150, 450] — 3 intentos máximo.
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/// - La auditoría de reservas corre solo vía Temporal Tables (AD8).
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/// </summary>
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public sealed class ReservarNumeroCommandHandler : ICommandHandler<ReservarNumeroCommand, ReservaNumeroDto>
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{
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private readonly IPuntoDeVentaRepository _repo;
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private readonly int[] _deadlockBackoffMs;
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private static readonly int[] DefaultBackoffMs = [50, 150, 450];
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public ReservarNumeroCommandHandler(IPuntoDeVentaRepository repo)
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: this(repo, DefaultBackoffMs) { }
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/// <summary>Constructor with custom backoff for testing (e.g., [0,0,0] for fast tests).</summary>
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public ReservarNumeroCommandHandler(IPuntoDeVentaRepository repo, int[] deadlockBackoffMs)
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{
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_repo = repo;
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_deadlockBackoffMs = deadlockBackoffMs;
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}
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public async Task<ReservaNumeroDto> Handle(ReservarNumeroCommand command)
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{
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for (var i = 0; ; i++)
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{
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try
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{
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var numero = await _repo.ReservarNumeroAsync(command.PuntoDeVentaId, command.TipoComprobante);
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return new ReservaNumeroDto(command.TipoComprobante, numero);
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}
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catch (DeadlockTransientException) when (i < _deadlockBackoffMs.Length)
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{
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// Deadlock — retry with backoff
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await Task.Delay(_deadlockBackoffMs[i]);
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}
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// All other exceptions bubble up immediately
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}
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}
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}
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