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dependent-compositions.md

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Dependent compositions

CSharp

The Setup method has an additional argument kind, which defines the type of composition:

  • CompositionKind.Public - will create a normal composition class, this is the default setting and can be omitted, it can also use the DependsOn method to use it as a dependency in other compositions
  • CompositionKind.Internal - the composition class will not be created, but that composition can be used to create other compositions by calling the DependsOn method with its name
  • CompositionKind.Global - the composition class will also not be created, but that composition will automatically be used to create other compositions
interface IDependency;

class Dependency : IDependency;

interface IService;

class Service(IDependency dependency) : IService;

class Program(IService service)
{
    public IService Service { get; } = service;
}

// This setup does not generate code, but can be used as a dependency
// and requires the use of the "DependsOn" call to add it as a dependency
DI.Setup("BaseComposition", CompositionKind.Internal)
    .Bind<IDependency>().To<Dependency>();

// This setup generates code and can also be used as a dependency
DI.Setup(nameof(Composition))
    // Uses "BaseComposition" setup
    .DependsOn("BaseComposition")
    .Bind<IService>().To<Service>()
    .Root<IService>("Root");

// As in the previous case, this setup generates code and can also be used as a dependency
DI.Setup(nameof(OtherComposition))
    // Uses "Composition" setup
    .DependsOn(nameof(Composition))
    .Root<Program>("Program");

var composition = new Composition();
var service = composition.Root;

var otherComposition = new OtherComposition();
service = otherComposition.Program.Service;

The following partial class will be generated:

partial class Composition
{
  private readonly Composition _root;

  [OrdinalAttribute(20)]
  public Composition()
  {
    _root = this;
  }

  internal Composition(Composition parentScope)
  {
    _root = (parentScope ?? throw new ArgumentNullException(nameof(parentScope)))._root;
  }

  public IService Root
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      return new Service(new Dependency());
    }
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public T Resolve<T>()
  {
    return Resolver<T>.Value.Resolve(this);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public T Resolve<T>(object? tag)
  {
    return Resolver<T>.Value.ResolveByTag(this, tag);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public object Resolve(Type type)
  {
    var index = (int)(_bucketSize * ((uint)RuntimeHelpers.GetHashCode(type) % 1));
    ref var pair = ref _buckets[index];
    return pair.Key == type ? pair.Value.Resolve(this) : Resolve(type, index);
  }

  [MethodImpl(MethodImplOptions.NoInlining)]
  private object Resolve(Type type, int index)
  {
    var finish = index + _bucketSize;
    while (++index < finish)
    {
      ref var pair = ref _buckets[index];
      if (pair.Key == type)
      {
        return pair.Value.Resolve(this);
      }
    }

    throw new InvalidOperationException($"{CannotResolveMessage} {OfTypeMessage} {type}.");
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public object Resolve(Type type, object? tag)
  {
    var index = (int)(_bucketSize * ((uint)RuntimeHelpers.GetHashCode(type) % 1));
    ref var pair = ref _buckets[index];
    return pair.Key == type ? pair.Value.ResolveByTag(this, tag) : Resolve(type, tag, index);
  }

  [MethodImpl(MethodImplOptions.NoInlining)]
  private object Resolve(Type type, object? tag, int index)
  {
    var finish = index + _bucketSize;
    while (++index < finish)
    {
      ref var pair = ref _buckets[index];
      if (pair.Key == type)
      {
        return pair.Value.ResolveByTag(this, tag);
      }
    }

    throw new InvalidOperationException($"{CannotResolveMessage} \"{tag}\" {OfTypeMessage} {type}.");
  }

  private readonly static int _bucketSize;
  private readonly static Pair<Type, IResolver<Composition, object>>[] _buckets;

  static Composition()
  {
    var valResolver_0000 = new Resolver_0000();
    Resolver<IService>.Value = valResolver_0000;
    _buckets = Buckets<Type, IResolver<Composition, object>>.Create(
      1,
      out _bucketSize,
      new Pair<Type, IResolver<Composition, object>>[1]
      {
         new Pair<Type, IResolver<Composition, object>>(typeof(IService), valResolver_0000)
      });
  }

  private const string CannotResolveMessage = "Cannot resolve composition root ";
  private const string OfTypeMessage = "of type ";

  private class Resolver<T>: IResolver<Composition, T>
  {
    public static IResolver<Composition, T> Value = new Resolver<T>();

    public virtual T Resolve(Composition composite)
    {
      throw new InvalidOperationException($"{CannotResolveMessage}{OfTypeMessage}{typeof(T)}.");
    }

    public virtual T ResolveByTag(Composition composite, object tag)
    {
      throw new InvalidOperationException($"{CannotResolveMessage}\"{tag}\" {OfTypeMessage}{typeof(T)}.");
    }
  }

  private sealed class Resolver_0000: Resolver<IService>
  {
    public override IService Resolve(Composition composition)
    {
      return composition.Root;
    }

    public override IService ResolveByTag(Composition composition, object tag)
    {
      switch (tag)
      {
        case null:
          return composition.Root;

        default:
          return base.ResolveByTag(composition, tag);
      }
    }
  }
}

The following partial class will be generated:

partial class OtherComposition
{
  private readonly OtherComposition _root;

  [OrdinalAttribute(20)]
  public OtherComposition()
  {
    _root = this;
  }

  internal OtherComposition(OtherComposition parentScope)
  {
    _root = (parentScope ?? throw new ArgumentNullException(nameof(parentScope)))._root;
  }

  public IService Root
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      return new Service(new Dependency());
    }
  }

  public Program Program
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      return new Program(new Service(new Dependency()));
    }
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public T Resolve<T>()
  {
    return Resolver<T>.Value.Resolve(this);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public T Resolve<T>(object? tag)
  {
    return Resolver<T>.Value.ResolveByTag(this, tag);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public object Resolve(Type type)
  {
    var index = (int)(_bucketSize * ((uint)RuntimeHelpers.GetHashCode(type) % 4));
    ref var pair = ref _buckets[index];
    return pair.Key == type ? pair.Value.Resolve(this) : Resolve(type, index);
  }

  [MethodImpl(MethodImplOptions.NoInlining)]
  private object Resolve(Type type, int index)
  {
    var finish = index + _bucketSize;
    while (++index < finish)
    {
      ref var pair = ref _buckets[index];
      if (pair.Key == type)
      {
        return pair.Value.Resolve(this);
      }
    }

    throw new InvalidOperationException($"{CannotResolveMessage} {OfTypeMessage} {type}.");
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public object Resolve(Type type, object? tag)
  {
    var index = (int)(_bucketSize * ((uint)RuntimeHelpers.GetHashCode(type) % 4));
    ref var pair = ref _buckets[index];
    return pair.Key == type ? pair.Value.ResolveByTag(this, tag) : Resolve(type, tag, index);
  }

  [MethodImpl(MethodImplOptions.NoInlining)]
  private object Resolve(Type type, object? tag, int index)
  {
    var finish = index + _bucketSize;
    while (++index < finish)
    {
      ref var pair = ref _buckets[index];
      if (pair.Key == type)
      {
        return pair.Value.ResolveByTag(this, tag);
      }
    }

    throw new InvalidOperationException($"{CannotResolveMessage} \"{tag}\" {OfTypeMessage} {type}.");
  }

  private readonly static int _bucketSize;
  private readonly static Pair<Type, IResolver<OtherComposition, object>>[] _buckets;

  static OtherComposition()
  {
    var valResolver_0000 = new Resolver_0000();
    Resolver<IService>.Value = valResolver_0000;
    var valResolver_0001 = new Resolver_0001();
    Resolver<Program>.Value = valResolver_0001;
    _buckets = Buckets<Type, IResolver<OtherComposition, object>>.Create(
      4,
      out _bucketSize,
      new Pair<Type, IResolver<OtherComposition, object>>[2]
      {
         new Pair<Type, IResolver<OtherComposition, object>>(typeof(IService), valResolver_0000)
        ,new Pair<Type, IResolver<OtherComposition, object>>(typeof(Program), valResolver_0001)
      });
  }

  private const string CannotResolveMessage = "Cannot resolve composition root ";
  private const string OfTypeMessage = "of type ";

  private class Resolver<T>: IResolver<OtherComposition, T>
  {
    public static IResolver<OtherComposition, T> Value = new Resolver<T>();

    public virtual T Resolve(OtherComposition composite)
    {
      throw new InvalidOperationException($"{CannotResolveMessage}{OfTypeMessage}{typeof(T)}.");
    }

    public virtual T ResolveByTag(OtherComposition composite, object tag)
    {
      throw new InvalidOperationException($"{CannotResolveMessage}\"{tag}\" {OfTypeMessage}{typeof(T)}.");
    }
  }

  private sealed class Resolver_0000: Resolver<IService>
  {
    public override IService Resolve(OtherComposition composition)
    {
      return composition.Root;
    }

    public override IService ResolveByTag(OtherComposition composition, object tag)
    {
      switch (tag)
      {
        case null:
          return composition.Root;

        default:
          return base.ResolveByTag(composition, tag);
      }
    }
  }

  private sealed class Resolver_0001: Resolver<Program>
  {
    public override Program Resolve(OtherComposition composition)
    {
      return composition.Program;
    }

    public override Program ResolveByTag(OtherComposition composition, object tag)
    {
      switch (tag)
      {
        case null:
          return composition.Program;

        default:
          return base.ResolveByTag(composition, tag);
      }
    }
  }
}

Class diagram:

classDiagram
	class OtherComposition {
		<<partial>>
		+Program Program
		+IService Root
		+ T ResolveᐸTᐳ()
		+ T ResolveᐸTᐳ(object? tag)
		+ object Resolve(Type type)
		+ object Resolve(Type type, object? tag)
	}
	class Program {
		+Program(IService service)
	}
	Service --|> IService
	class Service {
		+Service(IDependency dependency)
	}
	Dependency --|> IDependency
	class Dependency {
		+Dependency()
	}
	class IService {
		<<interface>>
	}
	class IDependency {
		<<interface>>
	}
	Program *--  Service : IService
	OtherComposition ..> Program : Program Program
	OtherComposition ..> Service : IService Root
	Service *--  Dependency : IDependency
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