重构代码并抽取基础构建库

libraries/HelloShop.EventBus.Abstractions/DistributedEvent.cs

@@ -0,0 +1,24 @@
+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace HelloShop.EventBus.Abstractions
+{
+    public record DistributedEvent
+    {
+        public DistributedEvent()
+        {
+            Id = Guid.NewGuid();
+            CreationTime = TimeProvider.System.GetUtcNow();
+        }
+
+        public Guid Id { get; set; }
+
+        public DateTimeOffset CreationTime { get; set; }
+
+        [JsonExtensionData]
+        public Dictionary<string, JsonElement>? ExtensionData { get; set; }
+    }
+}

libraries/HelloShop.EventBus.Abstractions/EventBusBuilderExtensions.cs

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+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+using Microsoft.Extensions.DependencyInjection;
+using System.Reflection;
+using System.Text.Json;
+
+namespace HelloShop.EventBus.Abstractions
+{
+    public static class EventBusBuilderExtensions
+    {
+        public static IEventBusBuilder ConfigureJsonOptions(this IEventBusBuilder eventBusBuilder, Action<JsonSerializerOptions> configure)
+        {
+            eventBusBuilder.Services.Configure<EventBusOptions>(o =>
+            {
+                configure(o.JsonSerializerOptions);
+            });
+
+            return eventBusBuilder;
+        }
+
+        public static IEventBusBuilder AddSubscription<TEvent, TEventHandler>(this IEventBusBuilder eventBusBuilder) where TEvent : DistributedEvent where TEventHandler : class, IDistributedEventHandler<TEvent>
+        {
+            eventBusBuilder.Services.AddKeyedTransient<IDistributedEventHandler, TEventHandler>(typeof(TEvent));
+
+            eventBusBuilder.Services.Configure<EventBusOptions>(o =>
+            {
+                o.EventTypes[typeof(TEvent).Name] = typeof(TEvent);
+            });
+
+            return eventBusBuilder;
+        }
+
+        public static IEventBusBuilder AddSubscription(this IEventBusBuilder eventBusBuilder, Type eventType, Type eventHandlerType)
+        {
+            eventBusBuilder.Services.AddKeyedTransient(typeof(IDistributedEventHandler), eventType, eventHandlerType);
+
+            eventBusBuilder.Services.Configure<EventBusOptions>(o =>
+            {
+                o.EventTypes[eventType.Name] = eventType;
+            });
+
+            return eventBusBuilder;
+        }
+
+        public static IEventBusBuilder AddSubscriptionFromAssembly(this IEventBusBuilder eventBusBuilder, Assembly? assembly = null)
+        {
+            assembly ??= Assembly.GetCallingAssembly();
+
+            var handlers = assembly.GetTypes().Where(t => t.IsAssignableTo(typeof(IDistributedEventHandler))).ToList();
+
+            handlers.ForEach(handler =>
+            {
+                var eventType = handler.GetInterfaces().Single(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IDistributedEventHandler<>)).GetGenericArguments().Single();
+                eventBusBuilder.AddSubscription(eventType, handler);
+            });
+
+            return eventBusBuilder;
+        }
+    }
+}

libraries/HelloShop.EventBus.Abstractions/EventBusOptions.cs

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+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+using System.Text.Json;
+using System.Text.Json.Serialization.Metadata;
+
+namespace HelloShop.EventBus.Abstractions
+{
+    public class EventBusOptions
+    {
+        public Dictionary<string, Type> EventTypes { get; } = [];
+
+        public JsonSerializerOptions JsonSerializerOptions { get; } = new(DefaultSerializerOptions);
+
+        internal static readonly JsonSerializerOptions DefaultSerializerOptions = new()
+        {
+            TypeInfoResolver = JsonSerializer.IsReflectionEnabledByDefault ? new DefaultJsonTypeInfoResolver() : JsonTypeInfoResolver.Combine()
+        };
+    }
+}

libraries/HelloShop.EventBus.Abstractions/HelloShop.EventBus.Abstractions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <PackageReference Include="Microsoft.Extensions.Options" />
+  </ItemGroup>
+
+</Project>

libraries/HelloShop.EventBus.Abstractions/IDistributedEventHandler.cs

@@ -0,0 +1,17 @@
+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+namespace HelloShop.EventBus.Abstractions
+{
+    public interface IDistributedEventHandler
+    {
+        Task HandleAsync(DistributedEvent @event);
+    }
+
+    public interface IDistributedEventHandler<in TDistributedEvent> : IDistributedEventHandler where TDistributedEvent : DistributedEvent
+    {
+        Task HandleAsync(TDistributedEvent @event);
+
+        Task IDistributedEventHandler.HandleAsync(DistributedEvent @event) => HandleAsync((TDistributedEvent)@event);
+    }
+}

libraries/HelloShop.EventBus.Abstractions/IEventBus.cs

@@ -0,0 +1,10 @@
+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+namespace HelloShop.EventBus.Abstractions
+{
+    public interface IEventBus
+    {
+        Task PublishAsync(DistributedEvent @event, CancellationToken cancellationToken = default);
+    }
+}

libraries/HelloShop.EventBus.Abstractions/IEventBusBuilder.cs

@@ -0,0 +1,12 @@
+// Copyright (c) HelloShop Corporation. All rights reserved.
+// See the license file in the project root for more information.
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace HelloShop.EventBus.Abstractions
+{
+    public interface IEventBusBuilder
+    {
+        public IServiceCollection Services { get; }
+    }
+}