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mix-async-generator

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``` npm i mix-async-generator ```

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import { Evt } from "evt"; import { safePromiseThen, PromiseOut } from "@bfchain/util-extends-promise"; import { FastQuene } from "./FastQuene"; const DONE = Promise.resolve({ step: { value: undefined, done: true }, }); export class MixAsyncGenerator { constructor() { this._allGenList = new FastQuene(); /**正在执行中的任务,等待返回后就从这个集合中移除 */ this._runnings = new Map(); /**候补队列 */ this._benchGen = new FastQuene(); /**自由队列 */ this._freeGen = new FastQuene(); this._genWaitter = new FastQuene(); // private _traceCount = 0; this._freeResult = new FastQuene(); this._benchResult = new FastQuene(); this._resultWaiter = new FastQuene(); this.onError = new Evt(); } join(runner, opts) { let bench = false; let jumpGun; let name = `gen-${this._allGenList.size + 1}`; if (opts !== undefined) { opts.name !== undefined && (name = opts.name); opts.bench !== undefined && (bench = opts.bench); jumpGun = opts.jumpGun; } if (jumpGun === undefined) { jumpGun = bench ? 1 : 1; /**非惰性元素至少抢跑1步 */ } if (bench === false && jumpGun < 1) { throw new RangeError("when runner no in bench, jump gun should not be 0"); } return this._join({ runner, name, bench, jumpGun, currentStep: undefined, inQueueSteps: 0, }); } _join(gen) { this._allGenList.push(gen); /// 否则保存到惰性列表中,需要时再使用 if (gen.bench) { this._benchGen.push(gen); } /// 如果是非惰性的,那么直接启动迭代 else { this._handleGen(gen); } return gen; } remove(gen) { if (this._allGenList.remove(gen)) { /// 如果全部归空了,那么将其余在等待中的都关闭掉 if (this._allGenList.size === 0) { do { const waiter = this._resultWaiter.shift(); if (waiter === undefined) { break; } waiter.resolve(DONE); } while (true); } return true; } return false; } _enqueueGen(gen) { // 是否有在等待中的 const waiter = this._genWaitter.shift(); if (waiter) { waiter.resolve(gen); } /// 如果是惰性元素,那么回到惰性队列 else if (gen.bench) { this._benchGen.push(gen); } /// 如果是非惰性元素,那么回到自由队列 else { this._freeGen.push(gen); } } async _dequeueGen() { // 获取一个可用的迭代器 const gen = this._freeGen.shift() || this._benchGen.shift() || (await this._genWaitter.push(new PromiseOut()).promise); this._handleGen(gen); } _handleGen(gen) { const item = gen.runner.next(); this._runnings.set(item, gen); // 如果完成,则回到自由队列 safePromiseThen(item, (value) => { this._runnings.delete(item); // 缓存当前结果 gen.currentStep = value; /// 如果已经完结了,那么直接移除掉了 if (value.done) { this.remove(gen); /// 如果没有任何在执行中的元素,就需要继续从队列中读取出来执行,否则外面的Promise就永远无法resolve if (this._runnings.size === 0) { this._dequeueGen(); } } /// 否则回到队列中继续提供下一个迭代 else { // 传递到结果队列中 this._enqueueResult({ from: gen, step: value }); /// 如果可以偷跑,那么继续执行 if (gen.inQueueSteps < gen.jumpGun) { this._handleGen(gen); } else { // 回到空闲队列中 this._enqueueGen(gen); } } }, (reason) => { this._runnings.delete(item); // 如果已经出错,那么直接移除 this.remove(gen); // 向外传递错误 this.onError.post({ from: gen, reason }); }); } /**入列 * 这个函数与_handleGen是紧密关联的,是_handleGen的一部分 */ _enqueueResult(result) { /// 是否有在等待中的 const waiter = this._resultWaiter.shift(); if (waiter !== undefined) { /** * 因为本就是要直接返回的,所以这里直接将步数减去 * * Waiter模式不需要修改inQueueSteps,因为是预约的,直接返回 */ waiter.resolve(result); } else { result.from.bench ? this._benchResult.push(result) : this._freeResult.push(result); result.from.inQueueSteps += 1; } } /**出列 */ _dequeueResult() { /// 再从结果队列中读取 const resultWithFrom1 = this._freeResult.shift(); if (resultWithFrom1 !== undefined) { const gen = resultWithFrom1.from; gen.inQueueSteps -= 1; if (this._freeGen.remove(gen)) { this._handleGen(gen); } return resultWithFrom1; } const resultWithFrom2 = this._benchResult.shift(); if (resultWithFrom2 !== undefined) { const gen = resultWithFrom2.from; gen.inQueueSteps -= 1; if (this._benchGen.remove(gen)) { this._handleGen(gen); } /** * @TODO 使用了候补元素,那么就要对元素尽快进行补充 */ return resultWithFrom2; } // 否则排队进行等待,Waiter模式不需要修改inQueueSteps,因为是预约的,直接返回 const resultPromise = this._resultWaiter.push(new PromiseOut()).promise; /// 必要时,让选手出列 if ( // 如果没有任何一个在运行中的任务:那么立刻执行 this._runnings.size === 0 || // 如果自由队列为空,但是候补队列有存在的:那么也立刻执行 (this._freeGen.size === 0 && this._benchGen.size !== 0)) { this._dequeueGen(); } // console.log(++this._traceCount); // if (this._traceCount === 2) { // debugger; // } return resultPromise; } next() { if (this.isDone) { return DONE; } return this._dequeueResult(); } get isDone() { return ( /* _allGenList为空也就意味着_running为空 */ this._allGenList.size === 0 && this._freeResult.size === 0 && this._benchResult.size === 0); } async *toAsyncIterator() { while (true) { const result = await this.next(); if (result.step.done) { return; } yield result.step.value; } } async toPromise() { while (true) { const result = await this.next(); if (result.step.done) { return; } } } } //# 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{ Evt } from \"evt\";\r\nimport { safePromiseThen, PromiseOut } from \"@bfchain/util-extends-promise\";\r\nimport { FastQuene } from \"./FastQuene\";\r\n\r\nexport declare namespace MixAsyncGenerator {\r\n  type AG<NextOut = unknown, Return = unknown, NextIn = unknown> = [\r\n    NextOut,\r\n    Return,\r\n    NextIn\r\n  ];\r\n  type Gen<T extends AG, B extends boolean = boolean> = {\r\n    name: string;\r\n    runner: AsyncGenerator<T[0], T[1], T[2]>;\r\n    /**替补元素/惰性元素\r\n     * 意味着只有到不得不用的时候才会去使用\r\n     */\r\n    bench: B;\r\n    /**当前的步伐 */\r\n    currentStep: IteratorResult<T[0], T[1]> | undefined;\r\n    /**偷跑的步数，默认是0\r\n     * 偷跑意味着它始终会努力提供jumpGun个result\r\n     * 替补元素也可以偷跑，但只有轮到它上场才能偷跑\r\n     */\r\n    jumpGun: number;\r\n    /**缓存在队列中的步伐数 */\r\n    inQueueSteps: number;\r\n  };\r\n  type Result<T extends AG> = {\r\n    step: IteratorResult<T[0], T[1]>;\r\n    from?: Gen<T>;\r\n  };\r\n  type ResultWithFrom<T extends AG, B extends boolean = boolean> = {\r\n    step: IteratorResult<T[0], T[1]>;\r\n    from: Gen<T, B>;\r\n  };\r\n  type Error<T extends AG> = {\r\n    from: Gen<T>;\r\n    reason: unknown;\r\n  };\r\n}\r\n\r\nconst DONE = Promise.resolve({\r\n  step: { value: undefined, done: true as const },\r\n});\r\n\r\nexport class MixAsyncGenerator<\r\n  T extends MixAsyncGenerator.AG = MixAsyncGenerator.AG\r\n> {\r\n  private _allGenList = new FastQuene<MixAsyncGenerator.Gen<T>>();\r\n  join(\r\n    runner: AsyncGenerator<T[0], T[1], T[2]>,\r\n    opts?: { name?: string; bench?: boolean; jumpGun?: number }\r\n  ) {\r\n    let bench = false;\r\n    let jumpGun: number | undefined;\r\n    let name = `gen-${this._allGenList.size + 1}`;\r\n    if (opts !== undefined) {\r\n      opts.name !== undefined && (name = opts.name);\r\n      opts.bench !== undefined && (bench = opts.bench);\r\n      jumpGun = opts.jumpGun;\r\n    }\r\n    if (jumpGun === undefined) {\r\n      jumpGun = bench ? 1 : 1; /**非惰性元素至少抢跑1步 */\r\n    }\r\n    if (bench === false && jumpGun < 1) {\r\n      throw new RangeError(\"when runner no in bench, jump gun should not be 0\");\r\n    }\r\n\r\n    return this._join({\r\n      runner,\r\n      name,\r\n      bench,\r\n      jumpGun,\r\n      currentStep: undefined,\r\n      inQueueSteps: 0,\r\n    });\r\n  }\r\n  private _join(gen: MixAsyncGenerator.Gen<T>) {\r\n    this._allGenList.push(gen);\r\n    /// 否则保存到惰性列表中，需要时再使用\r\n    if (gen.bench) {\r\n      this._benchGen.push(gen as MixAsyncGenerator.Gen<T, true>);\r\n    }\r\n    /// 如果是非惰性的，那么直接启动迭代\r\n    else {\r\n      this._handleGen(gen);\r\n    }\r\n    return gen;\r\n  }\r\n  remove(gen: MixAsyncGenerator.Gen<T>) {\r\n    if (this._allGenList.remove(gen)) {\r\n      /// 如果全部归空了，那么将其余在等待中的都关闭掉\r\n      if (this._allGenList.size === 0) {\r\n        do {\r\n          const waiter = this._resultWaiter.shift();\r\n          if (waiter === undefined) {\r\n            break;\r\n          }\r\n          waiter.resolve(DONE);\r\n        } while (true);\r\n      }\r\n      return true;\r\n    }\r\n    return false;\r\n  }\r\n  private _enqueueGen(gen: MixAsyncGenerator.Gen<T>) {\r\n    // 是否有在等待中的\r\n    const waiter = this._genWaitter.shift();\r\n    if (waiter) {\r\n      waiter.resolve(gen);\r\n    }\r\n    /// 如果是惰性元素，那么回到惰性队列\r\n    else if (gen.bench) {\r\n      this._benchGen.push(gen as MixAsyncGenerator.Gen<T, true>);\r\n    }\r\n    /// 如果是非惰性元素，那么回到自由队列\r\n    else {\r\n      this._freeGen.push(gen as MixAsyncGenerator.Gen<T, false>);\r\n    }\r\n  }\r\n  private async _dequeueGen() {\r\n    // 获取一个可用的迭代器\r\n    const gen =\r\n      this._freeGen.shift() ||\r\n      this._benchGen.shift() ||\r\n      (await this._genWaitter.push(new PromiseOut()).promise);\r\n    this._handleGen(gen);\r\n  }\r\n  /**正在执行中的任务，等待返回后就从这个集合中移除 */\r\n  private _runnings = new Map<\r\n    Promise<IteratorResult<T[0], T[1]>>,\r\n    MixAsyncGenerator.Gen<T>\r\n  >();\r\n  private _handleGen(gen: MixAsyncGenerator.Gen<T>) {\r\n    const item = gen.runner.next();\r\n    this._runnings.set(item, gen);\r\n    // 如果完成，则回到自由队列\r\n    safePromiseThen(\r\n      item,\r\n      (value) => {\r\n        this._runnings.delete(item);\r\n        // 缓存当前结果\r\n        gen.currentStep = value;\r\n        /// 如果已经完结了，那么直接移除掉了\r\n        if (value.done) {\r\n          this.remove(gen);\r\n\r\n          /// 如果没有任何在执行中的元素，就需要继续从队列中读取出来执行，否则外面的Promise就永远无法resolve\r\n          if (this._runnings.size === 0) {\r\n            this._dequeueGen();\r\n          }\r\n        }\r\n        /// 否则回到队列中继续提供下一个迭代\r\n        else {\r\n          // 传递到结果队列中\r\n          this._enqueueResult({ from: gen, step: value });\r\n\r\n          /// 如果可以偷跑，那么继续执行\r\n          if (gen.inQueueSteps < gen.jumpGun) {\r\n            this._handleGen(gen);\r\n          } else {\r\n            // 回到空闲队列中\r\n            this._enqueueGen(gen);\r\n          }\r\n        }\r\n      },\r\n      (reason: unknown) => {\r\n        this._runnings.delete(item);\r\n        // 如果已经出错，那么直接移除\r\n        this.remove(gen);\r\n        // 向外传递错误\r\n        this.onError.post({ from: gen, reason });\r\n      }\r\n    );\r\n  }\r\n\r\n  /**候补队列 */\r\n  private _benchGen = new FastQuene<MixAsyncGenerator.Gen<T, true>>();\r\n  /**自由队列 */\r\n  private _freeGen = new FastQuene<MixAsyncGenerator.Gen<T, false>>();\r\n  private _genWaitter = new FastQuene<PromiseOut<MixAsyncGenerator.Gen<T>>>();\r\n  /**入列\r\n   * 这个函数与_handleGen是紧密关联的，是_handleGen的一部分\r\n   */\r\n  private _enqueueResult(result: MixAsyncGenerator.ResultWithFrom<T>) {\r\n    /// 是否有在等待中的\r\n    const waiter = this._resultWaiter.shift();\r\n    if (waiter !== undefined) {\r\n      /**\r\n       * 因为本就是要直接返回的，所以这里直接将步数减去\r\n       *\r\n       * Waiter模式不需要修改inQueueSteps，因为是预约的，直接返回\r\n       */\r\n      waiter.resolve(result);\r\n    } else {\r\n      result.from.bench\r\n        ? this._benchResult.push(\r\n            result as MixAsyncGenerator.ResultWithFrom<T, true>\r\n          )\r\n        : this._freeResult.push(\r\n            result as MixAsyncGenerator.ResultWithFrom<T, false>\r\n          );\r\n      result.from.inQueueSteps += 1;\r\n    }\r\n  }\r\n  /**出列 */\r\n  private _dequeueResult() {\r\n    /// 再从结果队列中读取\r\n    const resultWithFrom1 = this._freeResult.shift();\r\n    if (resultWithFrom1 !== undefined) {\r\n      const gen = resultWithFrom1.from;\r\n      gen.inQueueSteps -= 1;\r\n      if (this._freeGen.remove(gen)) {\r\n        this._handleGen(gen);\r\n      }\r\n      return resultWithFrom1;\r\n    }\r\n\r\n    const resultWithFrom2 = this._benchResult.shift();\r\n    if (resultWithFrom2 !== undefined) {\r\n      const gen = resultWithFrom2.from;\r\n      gen.inQueueSteps -= 1;\r\n      if (this._benchGen.remove(gen)) {\r\n        this._handleGen(gen);\r\n      }\r\n      /**\r\n       * @TODO 使用了候补元素，那么就要对元素尽快进行补充\r\n       */\r\n      return resultWithFrom2;\r\n    }\r\n\r\n    // 否则排队进行等待，Waiter模式不需要修改inQueueSteps，因为是预约的，直接返回\r\n    const resultPromise = this._resultWaiter.push(new PromiseOut()).promise;\r\n    /// 必要时，让选手出列\r\n    if (\r\n      // 如果没有任何一个在运行中的任务：那么立刻执行\r\n      this._runnings.size === 0 ||\r\n      // 如果自由队列为空，但是候补队列有存在的：那么也立刻执行\r\n      (this._freeGen.size === 0 && this._benchGen.size !== 0)\r\n    ) {\r\n      this._dequeueGen();\r\n    }\r\n    // console.log(++this._traceCount);\r\n    // if (this._traceCount === 2) {\r\n    //   debugger;\r\n    // }\r\n    return resultPromise;\r\n  }\r\n  // private _traceCount = 0;\r\n  private _freeResult = new FastQuene<\r\n    MixAsyncGenerator.ResultWithFrom<T, false>\r\n  >();\r\n  private _benchResult = new FastQuene<\r\n    MixAsyncGenerator.ResultWithFrom<T, true>\r\n  >();\r\n  private _resultWaiter = new FastQuene<\r\n    PromiseOut<MixAsyncGenerator.Result<T>>\r\n  >();\r\n  readonly onError = new Evt<MixAsyncGenerator.Error<T>>();\r\n  next() {\r\n    if (this.isDone) {\r\n      return DONE as Promise<MixAsyncGenerator.Result<T>>;\r\n    }\r\n    return this._dequeueResult();\r\n  }\r\n  get isDone() {\r\n    return (\r\n      /* _allGenList为空也就意味着_running为空 */ this._allGenList.size === 0 &&\r\n      this._freeResult.size === 0 &&\r\n      this._benchResult.size === 0\r\n    );\r\n  }\r\n  async *toAsyncIterator() {\r\n    while (true) {\r\n      const result = await this.next();\r\n      if (result.step.done) {\r\n        return;\r\n      }\r\n      yield result.step.value;\r\n    }\r\n  }\r\n  async toPromise() {\r\n    while (true) {\r\n      const result = await this.next();\r\n      if (result.step.done) {\r\n        return;\r\n      }\r\n    }\r\n  }\r\n}\r\n"]}