Demo application for Sharpenter.BootstrapperLoader library

https://www.codeproject.com/Articles/1162975/Bootstrapper-Loader-for-Layered-Architecture

Run the application

• Build the solution (make sure your machine has .NET Core - Version 2.0.0):

  dotnet build
  

• Make sure you have PostgreSQL database running. If you want to use Docker, here is the command to create a PostgreSQL container for testing purpose:

  docker run --name bootstrapper-loader-demo -p 5432:5432 -e POSTGRES_PASSWORD=mysecretpassword -d postgres
  

• Update connection string in BootstrapperLoaderDemo\appsettings.json to correct database connection string (The connection string provided in appsettings.json assumes we are using PostgreSQL database created from docker command above)

• Run BootstrapperLoaderDemo

  dotnet run
  

If everything works correctly, it should show this home page:

Project structure

• BootstrapperLoaderDemo: main UI project, contains a single HomeController that displays a list of books retrieved from database
• BootstrapperLoaderDemo.Core: contain domain model (Book) and repository interface (IBookRepository)
• BootstrapperLoaderDemo.Repository: contains implementation of book repository (BookRepository)

Notes

• There's no project reference from BootstrapperLoader to BootstrapperLoaderDemo.Repository. Controllers work strictly with repository interfaces (from Core project)

• Since there's no project reference from BootstrapperLoader to BootstrapperLoaderDemo.Repository, Visual Studio will not copy BootstrapperLoaderDemo.Repository.dll and its dependencies to output directory of BootstrapperLoader during building. To work around this, I use PostBuild target in BootstrapperLoaderDemo.csproj:

  <Target Name="PostBuild" AfterTargets="PostBuildEvent">
    <ItemGroup>
      <ItemsToCopy Include="./../BootstrapperLoaderDemo.Repository/bin/$(Configuration)/$(TargetFramework)/*.dll" />
    </ItemGroup>
    <Copy
        SourceFiles="@(ItemsToCopy)"
        DestinationFolder="./bin/$(Configuration)/$(TargetFramework)/temp/">
        <Output
            TaskParameter="CopiedFiles"
            ItemName="SuccessfullyCopiedFiles"/>
      </Copy>
      <Message Importance="High" Text="PostBuild Target successfully copied:%0a@(ItemsToCopy->'- %(fullpath)', '%0a')%0a -> %0a@(SuccessfullyCopiedFiles->'- %(fullpath)', '%0a')"/>
  </Target>
  

• BootstrapperLoaderDemo.Repository is responsible for its own initialization (in Bootstrapper class):

  • It registers concrete implementation of repositories to their interface in Bootstrapper.ConfigureContainer()
  • It does database initialization (drop and create database, create tables, seeds data) in Bootstrapper.ConfigureDevelopment()

• BootstrapperLoader object is created and configured in BootstrapperLoaderDemo.Startup constructor:

  _bootstrapperLoader = new LoaderBuilder()
                          //Look for all dlls starting with BootstrapperLoaderDemo
                          .Use(new FileSystemAssemblyProvider(PlatformServices.Default.Application.ApplicationBasePath, "BootstrapperLoaderDemo.*.dll"))
                          .ForClass()
                              //Inject Configuration object into Bootstrapper classes found in those dlls
                              .HasConstructorParameter(Configuration)
                              //Call Bootstrapper.ConfigureDevelopment() if it's development environment
                              .When(env.IsDevelopment)
                                  .AddMethodNameConvention("Development")
                          .Build();
  

It triggers ConfigureContainer() in bootstrapper classes in Startup.ConfigureServices(), passing in IServiceCollection instance so that bootstrapper classes can register IoC mapping:

_bootstrapperLoader.TriggerConfigureContainer(services);

And trigger ConfigureDevelopment() in bootstrapper classes in Startup.Configure(), passing in IoC GetService():

// need to create scope during application startup due to: https://stackoverflow.com/questions/44180773/dependency-injection-in-asp-net-core-2-thows-exception
var scopeFactory = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>();
using (var scope = scopeFactory.CreateScope())
{
    _bootstrapperLoader.TriggerConfigure(scope.ServiceProvider.GetRequiredService);
}