dependency_injection_build 1.0.0.3

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.NET Core 2.1 Dependency Injection framework

Repository

build

Docs

wiki

Continious Integration

• CircleCI integration
• TravisCI integration

v1.0.0.3

Added support for automatic type resolution (type dependency resolution)

Examples

Automatic type dependency resolution

Usage:

// ServiceDataRepository depends upon SqlDataRepository
container.RegisterType<ServiceDataRepository>();
var sql = (ServiceDataRepository)container.CreateInstance("Build.Tests.TestSet16.ServiceDataRepository(Build.Tests.TestSet16.SqlDataRepository)");
Assert.NotNull(sql.Repository);

Definition:

public class SqlDataRepository : IPersonRepository
{
    [Dependency(RuntimeInstance.Singleton)]
    public SqlDataRepository(int repositoryId) => RepositoryId = repositoryId;

    public int RepositoryId { get; }

    public Person GetPerson(int personId)
    {
        // get the data from SQL DB and return Person instance.
        return new Person(this);
    }
}

public class ServiceDataRepository : IPersonRepository
{
    public ServiceDataRepository(int repositoryId) => RepositoryId = repositoryId;

    public ServiceDataRepository([Injection(typeof(SqlDataRepository), 2018)]IPersonRepository repository)
    {
        Repository = repository;
    }

    public IPersonRepository Repository { get; }
    public int RepositoryId { get; }

    public Person GetPerson(int personId)
    {
        // get the data from Web service and return Person instance.
        return new Person(this);
    }
}

Description

• Interface first-class support (instantiation, strong typing, external assembly)
• Circular references detection in type registration
• Automatic type resolution for all supported types
• Pure type instantiation (weak coupling)
• Declarative metadata attribute driven initialization
• Lazy type resolution and initialization (supports pure dependency injection decoupling anti-pattern)
• Singleton initialization support
• Automated and manual type registration
• Types aliases (user-friendly type identification)
• External assembly types support

v1.0.0.0

• Elimination of overlapped attribute specificators (removes violation of the SOLID principles)
• Circular references detection phase moved to type registration rather instantiation
• Automatic type resolution for all supported types if used in type instantiation
• Pure type instantiation as descriptive string with particular constructor and passing corresponding parameters

Features

• Declarative metadata attribute driven initialization
• Lazy type resolution and initialization (supports pure dependency decoupling anti-pattern)
• Circular references detection
• Singleton initialization
• Automated and manual type registration
• Type aliases
• External assembly types

Goal

The goal of development of this framework is to build automation of complex types initialization. Build can use declarative approach to define dependencies between types and their requirements. Constructor injection uses type resolution to resolve devendencies

Links

Dependency injection in ASP.NET Core

Inversion of Control Containers and the Dependency Injection pattern

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