Controller

Create and commit a controller class of your semester project with methods/operations from operation contracts. if already exists then add your operations of your operation contract to it.

Creator

Create and commit a "Factory" class which will be responsible for creating objects in your whole project for all layers except UI. This will be the only class where "new" keyword is allowed in the code.

Pure Fabrication with High Cohesion

Create a pure fabricated class "Validator", where you will write input validation methods for example isValidEmail, isValidName, isValidDate etc. Validator should return the results in a well defined highly cohesive "Response" object.

Indirection

Create a proxy class to controll the access to a sensitive data object e.g. Account. If request passed a condition then we return actual Account object, Otherwise a FakeAccount object is return.