partly or unimplemented features - now implemented

src/__Libraries/StellaOps.Provcache/ProvcacheServiceCollectionExtensions.Invalidation.cs

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: BUSL-1.1
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Microsoft.Extensions.Hosting;
+using StellaOps.Messaging;
+using StellaOps.Messaging.Abstractions;
+using StellaOps.Provcache.Events;
+using StellaOps.Provcache.Invalidation;
+
+namespace StellaOps.Provcache;
+
+public static partial class ProvcacheServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds event-driven invalidator services for Provcache.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddProvcacheInvalidators(this IServiceCollection services)
+    {
+        ArgumentNullException.ThrowIfNull(services);
+
+        services.TryAddSingleton<IEventStream<SignerRevokedEvent>>(sp =>
+        {
+            var factory = sp.GetRequiredService<IEventStreamFactory>();
+            return factory.Create<SignerRevokedEvent>(new EventStreamOptions
+            {
+                StreamName = SignerRevokedEvent.StreamName
+            });
+        });
+
+        services.TryAddSingleton<IEventStream<FeedEpochAdvancedEvent>>(sp =>
+        {
+            var factory = sp.GetRequiredService<IEventStreamFactory>();
+            return factory.Create<FeedEpochAdvancedEvent>(new EventStreamOptions
+            {
+                StreamName = FeedEpochAdvancedEvent.StreamName
+            });
+        });
+
+        services.TryAddEnumerable(ServiceDescriptor.Singleton<IProvcacheInvalidator, SignerSetInvalidator>());
+        services.TryAddEnumerable(ServiceDescriptor.Singleton<IProvcacheInvalidator, FeedEpochInvalidator>());
+        services.TryAddEnumerable(ServiceDescriptor.Singleton<IHostedService, InvalidatorHostedService>());
+
+        return services;
+    }
+}