Add project files.

src/common/Elsa.Features/Abstractions/FeatureBase.cs

@@ -0,0 +1,60 @@
+using Elsa.Features.Services;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace Elsa.Features.Abstractions;
+
+/// <summary>
+/// Base type for classes that represent a feature. 
+/// </summary>
+public abstract class FeatureBase : IFeature
+{
+    /// <summary>
+    /// Constructor.
+    /// </summary>
+    protected FeatureBase(IModule module)
+    {
+        Module = module;
+    }
+
+    /// <summary>
+    /// The module this feature is a part of.
+    /// </summary>
+    public IModule Module { get; }
+    
+    /// <summary>
+    /// A reference to the <see cref="IServiceCollection"/> to which services can be added.
+    /// </summary>
+    public IServiceCollection Services => Module.Services;
+
+    /// <summary>
+    /// Override this method to configure your feature.
+    /// </summary>
+    public virtual void Configure()
+    {
+    }
+
+    /// <summary>
+    /// Override this method to register any hosted services provided by your feature.
+    /// </summary>
+    public virtual void ConfigureHostedServices()
+    {
+    }
+
+    /// <summary>
+    /// Override this to register services with <see cref="Services"/>.
+    /// </summary>
+    public virtual void Apply()
+    {
+    }
+
+    /// <summary>
+    /// Configures the specified hosted service using an optional priority to control in which order it will be registered with the service container.
+    /// </summary>
+    /// <param name="priority">The priority.</param>
+    /// <typeparam name="T">The type of hosted service to configure.</typeparam>
+    protected void ConfigureHostedService<T>(int priority = 0) where T : class, IHostedService
+    {
+        Module.ConfigureHostedService<T>(priority);
+    }
+}