consumer-type.md

Consumer type

ConsumerType is used to get the consumer type of the given dependency. The use of ConsumerType is demonstrated on the example of Serilog library:

using Shouldly;
using Serilog.Core;
using Serilog.Events;
using Pure.DI;
using Serilog.Core;

Serilog.ILogger serilogLogger = new Serilog.LoggerConfiguration().CreateLogger();
var composition = new Composition(logger: serilogLogger);
var service = composition.Root;

interface IDependency;

class Dependency : IDependency
{
    public Dependency(Serilog.ILogger log)
    {
        log.Information("Dependency created");
    }
}

interface IService
{
    IDependency Dependency { get; }
}

class Service : IService
{
    public Service(
        Serilog.ILogger log,
        IDependency dependency)
    {
        Dependency = dependency;
        log.Information("Service initialized");
    }

    public IDependency Dependency { get; }
}

partial class Composition
{
    private void Setup() =>

        DI.Setup(nameof(Composition))
            .Arg<Serilog.ILogger>("logger", "from arg")
            .Bind().To(ctx => {
                ctx.Inject<Serilog.ILogger>("from arg", out var logger);

                // Enriches the logger with the specific context of the consumer type.
                // ctx.ConsumerType represents the type into which the dependency is being injected.
                // This allows logs to be tagged with the name of the class that created them.
                return logger.ForContext(ctx.ConsumerType);
            })
            .Bind().To<Dependency>()
            .Bind().To<Service>()
            .Root<IService>(nameof(Root));
}

dotnet --list-sdk

dotnet new console -n Sample

dotnet add package Pure.DI
dotnet add package Shouldly
dotnet add package Serilog.Core
dotnet add package Serilog.Events

dotnet run

partial class Composition
{
  private readonly Serilog.ILogger _argLogger;

  [OrdinalAttribute(128)]
  public Composition(Serilog.ILogger logger)
  {
    _argLogger = logger ?? throw new ArgumentNullException(nameof(logger));
  }

  public IService Root
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      Serilog.ILogger transientILogger1;
      Serilog.ILogger localLogger = _argLogger;
      // Enriches the logger with the specific context of the consumer type.
      // ctx.ConsumerType represents the type into which the dependency is being injected.
      // This allows logs to be tagged with the name of the class that created them.
      transientILogger1 = localLogger.ForContext(typeof(Dependency));
      Serilog.ILogger transientILogger;
      Serilog.ILogger localLogger1 = _argLogger;
      // Enriches the logger with the specific context of the consumer type.
      // ctx.ConsumerType represents the type into which the dependency is being injected.
      // This allows logs to be tagged with the name of the class that created them.
      transientILogger = localLogger1.ForContext(typeof(Service));
      return new Service(transientILogger, new Dependency(transientILogger1));
    }
  }
}

Class diagram:

---
 config:
  class:
   hideEmptyMembersBox: true
---
classDiagram
	Dependency --|> IDependency
	Service --|> IService
	Composition ..> Service : IService Root
	ILogger o-- ILogger : "from arg" Argument "logger"
	Dependency *-- ILogger : ILogger
	Service *-- ILogger : ILogger
	Service *-- Dependency : IDependency
	namespace Pure.DI.UsageTests.Basics.ConsumerTypeScenario {
		class Composition {
		<<partial>>
		+IService Root
		}
		class Dependency {
				<<class>>
			+Dependency(ILogger log)
		}
		class IDependency {
			<<interface>>
		}
		class IService {
			<<interface>>
		}
		class Service {
				<<class>>
			+Service(ILogger log, IDependency dependency)
		}
	}
	namespace Serilog {
		class ILogger {
				<<interface>>
		}
	}

See also:

• Consumer types