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Promise 任务并发控制器

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需求描述

  1. PromiseConcurrencyController 构造函数接受一个 number 类型的参数，作为并发数量。
  2. 实例上有一个 run 方法，接受一组返回 Promise 的函数，多次调用 run 方法时传入的函数将以传入的顺序执行，同一个 PromiseConcurrencyController 实例不管调用多少次 run 方法，传入的任务都需要按照构造函数中定义的并发数量运行。
  3. run 方法返回 ConcurrencyResult 实例，它实现了 AsyncIterator<T, void, void> 接口，也就是说它可以用 for ... await 语句进行迭代。ConcurrencyResult 类我们已经帮你实现，并且有相应的测试代码: concurrency-result.spec.ts, 你可以在当前目录下执行 yarn test 查看测试结果。
  4. stop 方法可以暂停控制器，这个方法返回一个 Promise, 等待当前正在执行的所有 Promise resolve/reject 之后返回的 Promise 被 resolve，该方法返回的 Promise 只有可能被 resolve 不会被 reject。如果已经被暂停则直接 resolve 返回的 Promise。
  5. resume 方法可以继续控制器的执行，用于控制器被 stop 之后恢复执行。
  6. 可以通过实例上的 activeCount 与 pendingCount 获得正在运行的任务个数以及等待个数。

评判标准

  • 完成需求
  • 补充 PromiseConcurrencyController 的单元测试
  • 工程化 (CI/CD/Lint 等)
  • 代码风格

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