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public class ShipmentCommand
{
private DateTime? _delivery;
private string _proofOfDelivery;
public ShipmentCommand(Guid shipmentID)
{
// Load current state
}
public void Deliver(DateTime delivery, string proofOfDelivery)
{
if (_delivery != null)
{
throw new InvalidOperationException("Already delivered.");
}
_delivery = delivery;
_proofOfDelivery = proofOfDelivery;
}
}
public class ShipmentQuery
{
private DateTime? _delivery;
public ShipmentQuery(Guid shipmentID)
{
// Load current state
}
public bool IsDelievered()
{
return _delivery.HasValue;
}
}
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