Building the solution

For this solution demonstration, we will implement three WCF backend services representing the checking, payment, and retirement account systems; these services will have data contracts, but will be "stubbed out". We will then implement a workflow service, which will be our aggregator, and also a sample ASP.NET page which will represent our web tier. A key aspect of this solution architecture is to follow service-oriented principles and keep our design as loosely coupled as possible. Within the organization, passing data by a data contract is acceptable; if we were interfacing with external systems we would implement message transformation.

• Internet Bank ASP.NET page

• Aggregator Windows Server AppFabric workflow

• Checking Account WCF service

• Savings Account WCF service

• Retirement Account WCF service