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public class ArriveHandler : IRequestHandler<Arrive> | |
{ | |
private readonly ShipmentDbContext _dbContext; | |
public ArriveHandler(ShipmentDbContext dbContext) | |
{ | |
_dbContext = dbContext; | |
} | |
public async Task<Unit> Handle(Arrive request, CancellationToken cancellationToken) | |
{ | |
var allStops = await _dbContext.Stops.Where(x => x.ShipmentId == request.ShipmentId).ToArrayAsync(); | |
var stop = allStops.SingleOrDefault(x => x.StopId == request.StopId); | |
if (stop == null) | |
{ | |
throw new InvalidOperationException("Stop does not exist."); | |
} | |
if (stop.Status != StopStatus.InTransit) | |
{ | |
throw new InvalidOperationException("Stop has already arrived."); | |
} | |
var previousStopsAreNotDeparted = allStops | |
.Where(x => x.Scheduled < stop.Scheduled) | |
.Any(x => x.Status != StopStatus.Departed); | |
if (previousStopsAreNotDeparted) | |
{ | |
throw new InvalidOperationException("Previous stops have not departed."); | |
} | |
stop.Status = StopStatus.Arrived; | |
stop.Arrived = request.Arrived; | |
await _dbContext.SaveChangesAsync(); | |
return Unit.Value; | |
} | |
} |
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