Tier Business Services Data Access SQL Server/ SQL Azure Account Table Account Profile Table Orders Table Holdings Table Quote Table Data Access Layer (DAL) Market Summary Class Customer Class Orders Class Middle-Tier Business Services Layer (BSL) Business Service Layer Core StockTrader Services Classes Business Transactions Service Client Class Order Processor Service (OPS) Service Client Class Order Processing Service Class Orders Tier ASP.NET Web Forms Business Transactions
Role Azure StockTrader Order Processor Service Web Role Azure StockTrader Business Services Account DB SQL Azure Scale-out Instances Scale-out Instances Scale-out Instances Quote DB SQL Azure RESTful Endpoint + Token Service Polling Publishing