GFramework/GFramework.Core/Cqrs/Command/AbstractStreamCommandHandler.cs
GeWuYou f8fa2a8481 feat(cqrs): 添加流式命令处理器和自动注册功能
- 实现 AbstractStreamCommandHandler 基类支持流式命令处理
- 创建 CqrsHandlerRegistrar 自动扫描注册 CQRS 处理器
- 添加流式处理器接口 IStreamRequestHandler 支持
- 实现处理器注册的容错机制和类型加载恢复
- 添加确定性排序确保跨环境稳定的处理器注册顺序
- 提供完整的单元测试验证注册行为和异常处理
2026-04-14 22:05:20 +08:00

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// Copyright (c) 2026 GeWuYou
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using GFramework.Core.Abstractions.Cqrs;
using GFramework.Core.Abstractions.Cqrs.Command;
using GFramework.Core.Rule;
namespace GFramework.Core.Cqrs.Command;
/// <summary>
/// 抽象流式命令处理器基类。
/// 继承自 <see cref="ContextAwareBase" /> 并实现 <see cref="IStreamRequestHandler{TRequest,TResponse}" />
/// 为具体的流式命令处理器提供基础功能。
/// </summary>
/// <typeparam name="TCommand">流式命令类型,必须实现 <see cref="IStreamCommand{TResponse}" />。</typeparam>
/// <typeparam name="TResponse">流式命令响应元素类型。</typeparam>
/// <remarks>
/// 框架会在每次调用 <c>CreateStream</c> 进入实际处理逻辑前,为当前处理器实例注入架构上下文,
/// 因此派生类只能在 <see cref="Handle" /> 执行期间及其返回的异步枚举序列内假定 <c>Context</c> 可用。
/// 默认注册器会将流式命令处理器注册为瞬态服务,以避免同一个上下文感知实例在多个流或并发请求之间复用。
/// 派生类不应缓存处理器实例,也不应把依赖当前上下文的可变状态泄漏到流外部。
/// 传入 <see cref="Handle" /> 的取消令牌同时约束流的创建与后续枚举,
/// 派生类应在启动阶段和每次生成响应前尊重取消请求,避免在调用方停止枚举后继续执行后台工作。
/// </remarks>
public abstract class AbstractStreamCommandHandler<TCommand, TResponse> : ContextAwareBase,
IStreamRequestHandler<TCommand, TResponse>
where TCommand : IStreamCommand<TResponse>
{
/// <summary>
/// 处理流式命令并返回异步可枚举的响应序列。
/// 由具体的流式命令处理器子类实现流式处理逻辑。
/// </summary>
/// <param name="command">要处理的流式命令对象。</param>
/// <param name="cancellationToken">取消令牌,用于取消流式处理操作。</param>
/// <returns>异步可枚举的响应序列,每个元素类型为 <typeparamref name="TResponse" />。</returns>
public abstract IAsyncEnumerable<TResponse> Handle(TCommand command, CancellationToken cancellationToken);
}