// handle commands
public static (Event Event, AccountState NewState) Debit
(this AccountState @this, MakeTransfer transfer)
{
var evt = transfer.ToEvent();
var newState = @this.Apply(evt);
return(evt, newState);
}
public static Validation <(Event Event, AccountState NewState)> Freeze
(this AccountState @this, FreezeAccount cmd)
{
if (@this.Status == AccountStatus.Frozen)
{
return(Errors.AccountNotActive);
}
FrozeAccount evt = cmd.ToEvent();
AccountState newState = @this.Apply(evt);
return(evt as Event, newState);
}
// handle commands
public static Validation <(Event Event, AccountState NewState)> Debit
(this AccountState @this, MakeTransfer cmd)
{
if (@this.Status != AccountStatus.Active)
{
return(Errors.AccountNotActive);
}
if (@this.Balance - cmd.Amount < @this.AllowedOverdraft)
{
return(Errors.InsufficientBalance);
}
DebitedTransfer evt = cmd.ToEvent();
AccountState newState = @this.Apply(evt);
return(evt as Event, newState);
}