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Merge pull request #33 from MrDave1999/feat/issue-32
feat: Add support for dependency injection via constructor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| namespace Example.Contracts; | ||
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| public interface ITestService | ||
| { | ||
| string Execute(); | ||
| } |
10 changes: 10 additions & 0 deletions
10
samples/HostApplications/WebApi/Controllers/ServiceController.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| namespace Example.HostWebApi.Controllers; | ||
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| [ApiController] | ||
| [Route("[controller]")] | ||
| public class ServiceController | ||
| { | ||
| [HttpGet] | ||
| public ActionResult<string> Get(IEnumerable<ITestService> services) | ||
| => services.First().Execute(); | ||
| } |
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9 changes: 9 additions & 0 deletions
9
samples/Plugins/DependencyInjectionPlugin/Example.DependencyInjectionPlugin.csproj
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,9 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk.Web"> | ||
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| <PropertyGroup> | ||
| <OutDir>$(WebApiProjectDir)</OutDir> | ||
| <OutputType>Library</OutputType> | ||
| <NoDefaultLaunchSettingsFile>true</NoDefaultLaunchSettingsFile> | ||
| </PropertyGroup> | ||
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| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| global using Example.Contracts; | ||
| global using CPlugin.Net; | ||
| global using Example.DependencyInjectionPlugin; |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,23 @@ | ||
| [assembly: Plugin(typeof(TestService))] | ||
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| namespace Example.DependencyInjectionPlugin; | ||
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| public class TestService : ITestService | ||
| { | ||
| private readonly ILogger<TestService> _logger; | ||
| private readonly IConfiguration _configuration; | ||
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| public TestService( | ||
| ILogger<TestService> logger, | ||
| IConfiguration configuration) | ||
| { | ||
| _logger = logger; | ||
| _configuration = configuration; | ||
| } | ||
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| public string Execute() | ||
| { | ||
| _logger.LogInformation("TestService"); | ||
| return _configuration["ServiceName"]; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using System.Reflection; | ||
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| namespace CPlugin.Net; | ||
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| /// <summary> | ||
| /// Extension methods for adding services to an <see cref="IServiceCollection"/>. | ||
| /// </summary> | ||
| public static class CPluginServiceCollectionExtensions | ||
| { | ||
| /// <summary> | ||
| /// Adds the subtypes that implement the contract specified by <typeparamref name="TSupertype"/> | ||
| /// to the service collection, using the assemblies loaded by <see cref="PluginLoader"/>. | ||
| /// </summary> | ||
| /// <typeparam name="TSupertype"> | ||
| /// The type of contract (base type) shared between the host application and the plugins. | ||
| /// </typeparam> | ||
| /// <param name="services"> | ||
| /// The <see cref="IServiceCollection"/> to add the service to. | ||
| /// </param> | ||
| /// <param name="serviceLifetime"> | ||
| /// Specifies the lifetime of the services to be added to the service collection. | ||
| /// </param> | ||
| /// <remarks> | ||
| /// This method uses the <see cref="PluginAttribute"/> type to add the implementations of the contract | ||
| /// to the service collection, so plugins must use it. | ||
| /// </remarks> | ||
| /// <returns> | ||
| /// A reference to this instance after the operation has completed. | ||
| /// </returns> | ||
| public static IServiceCollection AddSubtypesOf<TSupertype>( | ||
| this IServiceCollection services, | ||
| ServiceLifetime serviceLifetime) where TSupertype : class | ||
| => services.AddSubtypesOf<TSupertype>(PluginLoader.Assemblies, serviceLifetime); | ||
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| // This method is only to be used for testing. | ||
| // This way you don't have to depend on the plugin loader when testing. | ||
| internal static IServiceCollection AddSubtypesOf<TSupertype>( | ||
| this IServiceCollection services, | ||
| IEnumerable<Assembly> assemblies, | ||
| ServiceLifetime serviceLifetime) where TSupertype : class | ||
| { | ||
| if (assemblies is null) | ||
| throw new ArgumentNullException(nameof(assemblies)); | ||
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| foreach (Assembly assembly in assemblies) | ||
| { | ||
| var pluginAttributes = assembly.GetCustomAttributes<PluginAttribute>(); | ||
| foreach (PluginAttribute pluginAttribute in pluginAttributes) | ||
| { | ||
| Type implementationType = pluginAttribute.PluginType; | ||
| if (typeof(TSupertype).IsAssignableFrom(implementationType)) | ||
| { | ||
| services.AddService( | ||
| serviceType: typeof(TSupertype), | ||
| implementationType, | ||
| serviceLifetime); | ||
| } | ||
| } | ||
| } | ||
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| return services; | ||
| } | ||
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| private static IServiceCollection AddService( | ||
| this IServiceCollection services, | ||
| Type serviceType, | ||
| Type implementationType, | ||
| ServiceLifetime serviceLifetime) => serviceLifetime switch | ||
| { | ||
| ServiceLifetime.Singleton => services.AddSingleton(serviceType, implementationType), | ||
| ServiceLifetime.Transient => services.AddTransient(serviceType, implementationType), | ||
| ServiceLifetime.Scoped => services.AddScoped(serviceType, implementationType), | ||
| _ => throw new NotSupportedException($"Lifetime '{serviceLifetime}' is not supported.") | ||
| }; | ||
| } |
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