An Architecture for Anonymous Mobile Coupons in a Large Network

Algorithm 1

Pseudocode for request processing at the centralized service. The storeId value is an attribute of the authenticated HTTPS session.

CheckAndUpdate (D-code):

RetVal  ≔  not-ok;

Begin Atomic Transaction

   row  ≔  row of CouponCodeStatusTable such that row.CouponCode  =  D-code;

   if (row <> null AND row.RedeemedStatus  ==  false)

   then

       row.RedeemedStatus  ≔  true;

       row.RedeemedBy  ≔  storeId;

       row.RedeemedWhen  ≔  now;

       RetVal  ≔  ok

End Atomic Transaction

return RetVal