StartableTests.cs

// Copyright (c) Autofac Project. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.

using Autofac.Builder;
using Autofac.Core;

namespace Autofac.Specification.Test.Features;

public class StartableTests
{
    private interface IMyService
    {
    }

    private interface IStartableDependency
    {
    }

    [Fact]
    public void AutoActivate_CanBeAddedToChildLifetimeScope()
    {
        // Issue #567
        var singletonCount = 0;
        var container = new ContainerBuilder().Build();
        using (var scope = container.BeginLifetimeScope(b => b.RegisterType<MyComponent>().As<IMyService>().SingleInstance().AutoActivate().OnActivated(e => singletonCount++)))
        {
            Assert.Equal(1, singletonCount);
        }
    }

    [Fact]
    public void AutoActivate_InvalidLifetimeConflictsWithAutoStart()
    {
        var builder = new ContainerBuilder();
        builder.RegisterType<MyComponent2>().InstancePerMatchingLifetimeScope("foo").AutoActivate();
        Assert.Throws<DependencyResolutionException>(() => builder.Build());
    }

    [Fact]
    public void AutoActivate_MultipleAutoStartFlagsOnlyStartTheComponentOnce()
    {
        var instanceCount = 0;
        var builder = new ContainerBuilder();
        builder.RegisterType<MyComponent2>().AutoActivate().AutoActivate().AutoActivate().OnActivated(e => instanceCount++);
        builder.Build();
        Assert.Equal(1, instanceCount);
    }

    [Fact]
    public void AutoActivate_RegistrationsAddedToChildDoNotDoubleActivateParent()
    {
        // Issue #567
        var parentCount = 0;
        var childCount = 0;
        var builder = new ContainerBuilder();
        builder.RegisterType<MyComponent2>().AutoActivate().OnActivated(e => parentCount++);
        var container = builder.Build();
        using (var scope = container.BeginLifetimeScope(b => b.RegisterType<MyComponent>().AutoActivate().OnActivated(e => childCount++)))
        {
            using (var scope2 = scope.BeginLifetimeScope(b => b.RegisterInstance("x")))
            {
                Assert.Equal(1, childCount);
                Assert.Equal(1, parentCount);
            }
        }
    }

    [Fact]
    public void AutoActivate_ResolvesComponentsAutomatically()
    {
        var singletonCount = 0;
        var instanceCount = 0;
        var builder = new ContainerBuilder();
        builder.RegisterType<MyComponent>().As<IMyService>().SingleInstance().AutoActivate().OnActivated(e => singletonCount++);
        builder.RegisterType<MyComponent2>().AutoActivate().OnActivated(e => instanceCount++);
        builder.Build();
        Assert.Equal(1, singletonCount);
        Assert.Equal(1, instanceCount);
    }

    [Fact]
    public void Startable_WhenChildScopeBegins_NewStartableComponentsAreStarted()
    {
        var startable = new Startable();
        var builder = new ContainerBuilder();
        var container = builder.Build();
        var scope = container.BeginLifetimeScope(b => b.RegisterInstance(startable).As<IStartable>());
        Assert.True(startable.StartCount > 0);
    }

    [Fact]
    public void Startable_WhenNoStartIsSpecified_StartableComponentsAreIgnoredInChildLifetimeScope()
    {
        var startable = new Startable();
        var builder = new ContainerBuilder();
        var container = builder.Build(ContainerBuildOptions.IgnoreStartableComponents);
        var scope = container.BeginLifetimeScope(b => b.RegisterInstance(startable).As<IStartable>());
        Assert.False(startable.StartCount > 0);
    }

    [Fact]
    public void Startable_WhenNoStartIsSpecified_StartableComponentsAreIgnoredInContainer()
    {
        var startable = new Startable();
        var builder = new ContainerBuilder();
        builder.RegisterInstance(startable).As<IStartable>();
        builder.Build(ContainerBuildOptions.IgnoreStartableComponents);
        Assert.False(startable.StartCount > 0);
    }

    [Fact]
    public void Startable_WhenStartableCreatesChildScope_NoExceptionIsThrown()
    {
        // Issue #916
        var builder = new ContainerBuilder();
        builder.RegisterType<StartableCreatesLifetimeScope>().As<IStartable>().SingleInstance();

        // Assert.DoesNotThrow, basically.
        builder.Build();
    }

    [Fact]
    public void Startable_WhenStartIsSpecified_StartableComponentsAreStarted()
    {
        var startable = new Startable();
        var builder = new ContainerBuilder();
        builder.RegisterInstance(startable).As<IStartable>();
        builder.Build();
        Assert.True(startable.StartCount > 0);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void Startable_WhenTheContainerIsBuilt_StartableComponentsAreStartedInDependencyOrder(bool ignoreStartableComponents)
    {
        var builder = new ContainerBuilder();

        builder.RegisterType<StartableTakesDependency>().AsSelf()
            .SingleInstance().As<IStartable>();

        builder.RegisterType<ComponentTakesStartableDependency>()
            .WithParameter("expectStarted", !ignoreStartableComponents)
            .AsSelf()
            .As<IStartable>();

        var container = builder.Build(ignoreStartableComponents ? ContainerBuildOptions.IgnoreStartableComponents : ContainerBuildOptions.None);
        container.Resolve<ComponentTakesStartableDependency>();
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void Startable_WhenTheContainerIsBuilt_StartableComponentsThatDependOnAutoActivateComponents_AreNotStartedTwice(bool isSingleton)
    {
        var builder = new ContainerBuilder();
        var expectedStartCount = isSingleton ? 1 : 2;
        var dependencyRegistration = builder.RegisterType<StartableDependency>().As<IStartableDependency>().AutoActivate();
        if (isSingleton)
        {
            dependencyRegistration.SingleInstance();
        }

        builder.RegisterType<StartableTakesDependency>().AsSelf().As<IStartable>();

        StartableDependency.Count = 0;
        builder.Build();
        Assert.Equal(expectedStartCount, StartableDependency.Count);
    }

    [Fact]
    public void AutoActivate_DoesNotHideDefaultSelfService()
    {
        var builder = new ContainerBuilder();
        builder.RegisterType<MyComponent2>().AutoActivate();
        using var container = builder.Build();
        Assert.True(container.IsRegistered<MyComponent2>());
    }

    [Fact]
    public void AutoActivate_RegisterInstanceActivationWorksWhenDefaultServiceOverloaded()
    {
        var instanceCount = 0;
        var builder = new ContainerBuilder();
        builder.RegisterInstance(new MyComponent2()).As<object>().OnActivated(_ => instanceCount++);
        builder.RegisterType<object>();
        builder.Build();
        Assert.Equal(1, instanceCount);
    }

    private class ComponentTakesStartableDependency : IStartable
    {
        public ComponentTakesStartableDependency(StartableTakesDependency dependency, bool expectStarted)
        {
            Assert.Equal(expectStarted, dependency.WasStarted);
        }

        public void Start()
        {
        }
    }

    private sealed class MyComponent : IMyService
    {
    }

    private sealed class MyComponent2
    {
    }

    private class Startable : IStartable
    {
        public int StartCount { get; private set; }

        public void Start()
        {
            StartCount++;
        }
    }

    // Issue #916
    private class StartableCreatesLifetimeScope : IStartable
    {
        private readonly ILifetimeScope _scope;

        public StartableCreatesLifetimeScope(ILifetimeScope scope)
        {
            _scope = scope;
        }

        public void Start()
        {
            using (var nested = _scope.BeginLifetimeScope("tag", b => { }))
            {
            }

            using (var nested = _scope.BeginLifetimeScope(b => { }))
            {
            }

            using (var nested = _scope.BeginLifetimeScope("tag"))
            {
            }

            using (var nested = _scope.BeginLifetimeScope())
            {
            }
        }
    }

    private class StartableDependency : IStartableDependency
    {
        public StartableDependency()
        {
            Count++;
        }

        public static int Count { get; set; }
    }

    private class StartableTakesDependency : IStartable
    {
        public StartableTakesDependency(IStartableDependency[] dependencies)
        {
        }

        public bool WasStarted { get; private set; }

        public void Start()
        {
            WasStarted = true;
        }
    }
}