yalamarti/Hw

Hello World program showcase

Hw - Hello World

A Hello World program showcasing .net/c# and app design

Requirements:

• Write “Hello World” to the console/screen.
• Provide an API that is separated from the program logic to eventually support mobile applications, web applications, or console applications, or windows services.
• Support future enhancements for writing to a database, console etc. by using:
  • Common design patterns (inheritance, e.g.) to account for these future concerns.
  • Configuration files or another industry-standard mechanism for determining where to write the information to.

Implementation details

The program is implemented as a .NET Framework 4.6.1 based Visual Studio 2017 Console Application solution using C# language.

The solution consists of the following projects:

• Hw.Console
  • Entry point .NET Framework 4.6.1 EXE
  • Uses Unity as the DI container to manage and setup dependencies
  • Makes use of a appsettings.json file to manage the configuration/settings
  • Using the NewtonSoft.JSON library, retrieves settings from the JSON configuration file
  • Configuration file contains a single 'RepoTarget' setting that defines the default repository target
• Hw.DataModels
  • Contains the entities/data models available for all layers, in a .NET Standard 2.0 class library
  • For this sample program assumed the types are shared across all layers
• Hw.BusinessLogic
  • Implements the business logic in a .NET Standard 2.0 class library
  • For this sample, consider this as the 'API' that the client application uses
  • Exposes a HelloWorldManager class that provides 'greeting' services
• Hw.DataAccess
  • Implements the data 'persistency' / 'repository' layer in a .NET Standard 2.0 class library
  • Determines the repository target using a factory pattern
  • Currently supports 'console' and 'file' as the repository targets
  • Implements the persistency mechanism for 'console' and 'file' targets
  • Implements a custom Configuration/Settings class that reads from the specified JSON content
• Hw.Tests
  • Implements unit tests using MS Unit
  • Contains tests for the HelloWorldManager business logic class
  • Makes use of Moq library