Sandwich Order System

General Description

Sandwich Order System is a console program written in C# using Visual Studio Community Edition 2015. It allows the user to order sandwiches according to the following requirements:

• An order may consist of either a Signature Sandwich or a Custom Sandwich

• A Custom Sandwich must have one Bread and one Filling

• Optional extras for a Custom Sandwich include Cheese, Vegetables, and Condiments

  • If selected, only one Cheese is allowed
  • If selected, unlimited Vegetables and Condiments are allowed

• Optional extras for each order include a Drink and Chips

  • If selected, only one Drink is allowed
  • If selected, only one Chips is allowed
  • If both are selected, a ComboMeal discount is applied

• A list of several options for each type of item is presented

• The system allows the user to create as many orders as desired.

User functions available to the user are:

• Add order, which starts the order creation process
• Show all orders, the prices of all items, and the total price
• Delete all orders
• Finish and checkout
• Quit to exit the system

During the order creation process, the user may:

• Delete the current order
• Review the current order before finalizing it

Upon choosing to finish ordering:

• The user is prompted to review all of his orders, each item price, and the total price.
• He may then choose to pay and checkout, after which his order is sent to fulfillment, and the orders collection is reset for the next user.

Program Entry Point

sandwich-order-system\src\SandwichOrderSystem\SandwichOrderSystem\Program.cs

Third Party Library Framework and Database Dependencies

• Castle Windsor : dependency injection
• Entity : object relational mapping
• Moq : unit test mocking
• SQL Server LocalDB : database

Note that SQL Server LocalDB is provided by default in Visual Studio Community Edition 2015. The default local database should be named (localdb)\MSSQLLocalDB, which this system requires to function.

Database Seed Data

Seed data for the items are specified in files separated by item names in:

sandwich-order-system\src\SandwichOrderSystem\SandwichOrderSystemShared\Data\

Upon first-time startup, database initialization may cause a lag of roughly 10 seconds. A welcoming message is displayed during this initialization period. After the first-time startup, system initialization is less than a second.

To change the seed data:

1. Edit the contents of item seed files in the ...\SandwichOrderSystemShared\Data\ directory. The format is the name and price separated by a comma, one item per line.

2. In Visual Studio's SQL Server Object Explorer, delete the database named SandwichOrderSystem within (localdb)\MSSQLLocalDB.

3. Clean, Rebuild, and Run the project.

Visual Studio Solution Projects

The entire solution is separated into 4 projects:

1. SandwichOrderSystem

• DI
• Models
• Services
• ViewControllers
• ViewModels
• Views

2. SandwichOrderSystemShared

• DI
• Data
• DataAccess
• Models
• Services

3. SandwichOrderSystemTests

• Unit Tests for SandwichOrderSystem project

4. SandwichOrderSystemSharedTests

• Unit Tests for SandwichOrderSystemShared project

The SandwichOrderSystem is the core console app project, and its classes are concerned with the console-driven UI/UX.

The SandwichOrderSystemShared project is a Class Library (dll). It was separated out because these interfaces form a shared resource which can be used in other presentations, for example, a web-based UI/UX front-end using ASP.Net.

High-Level Design Notes

Several design patterns were used, including:

• Adaptor to wrap System IO and Database resources
• Dependency Injection for inversion of control
• Factory for object creation
• MVVM to separate concerns
• State to efficiently organize the many view states, contexts, and segues in the UI/UX
• Repository to handle database interaction