GFramework/GFramework.Cqrs/Cqrs/Command/AbstractStreamCommandHandler.cs
GeWuYou e36c80229a feat(cqrs): 添加CQRS处理器基类和测试运行时支持
- 引入AbstractCommandHandler、AbstractQueryHandler等各类处理器基类
- 实现CqrsContextAwareHandlerBase提供上下文感知功能
- 添加CqrsTestRuntime为测试项目提供CQRS运行时访问入口
- 创建AbstractCqrsHandlerContextTests验证上下文注入行为
- 支持命令、查询、通知及流式处理的各种抽象基类实现
2026-04-15 20:34:08 +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.Cqrs.Abstractions.Cqrs;
using GFramework.Cqrs.Abstractions.Cqrs.Command;
namespace GFramework.Cqrs.Cqrs.Command;
/// <summary>
/// 抽象流式命令处理器基类。
/// 继承自轻量 CQRS 上下文基类并实现 <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> : CqrsContextAwareHandlerBase,
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);
}