tests/pools/abstract-pool.test.mjs

   1 import { EventEmitterAsyncResource } from 'node:events'
   2 import { dirname, join } from 'node:path'
   3 import { readFileSync } from 'node:fs'
   4 import { fileURLToPath } from 'node:url'
   5 import { createHook, executionAsyncId } from 'node:async_hooks'
   6 import { expect } from 'expect'
   7 import { restore, stub } from 'sinon'
   8 import {
   9   DynamicClusterPool,
  10   DynamicThreadPool,
  11   FixedClusterPool,
  12   FixedThreadPool,
  13   PoolEvents,
  14   PoolTypes,
  15   WorkerChoiceStrategies,
  16   WorkerTypes
  17 } from '../../lib/index.js'
  18 import { CircularArray } from '../../lib/circular-array.js'
  19 import { Deque } from '../../lib/deque.js'
  20 import { DEFAULT_TASK_NAME } from '../../lib/utils.js'
  21 import { waitPoolEvents } from '../test-utils.js'
  22 import { WorkerNode } from '../../lib/pools/worker-node.js'
  23
  24 describe('Abstract pool test suite', () => {
  25   const version = JSON.parse(
  26     readFileSync(
  27       join(dirname(fileURLToPath(import.meta.url)), '../..', 'package.json'),
  28       'utf8'
  29     )
  30   ).version
  31   const numberOfWorkers = 2
  32   class StubPoolWithIsMain extends FixedThreadPool {
  33     isMain () {
  34       return false
  35     }
  36   }
  37
  38   afterEach(() => {
  39     restore()
  40   })
  41
  42   it('Verify that pool can be created and destroyed', async () => {
  43     const pool = new FixedThreadPool(
  44       numberOfWorkers,
  45       './tests/worker-files/thread/testWorker.mjs'
  46     )
  47     expect(pool).toBeInstanceOf(FixedThreadPool)
  48     await pool.destroy()
  49   })
  50
  51   it('Verify that pool cannot be created from a non main thread/process', () => {
  52     expect(
  53       () =>
  54         new StubPoolWithIsMain(
  55           numberOfWorkers,
  56           './tests/worker-files/thread/testWorker.mjs',
  57           {
  58             errorHandler: e => console.error(e)
  59           }
  60         )
  61     ).toThrow(
  62       new Error(
  63         'Cannot start a pool from a worker with the same type as the pool'
  64       )
  65     )
  66   })
  67
  68   it('Verify that pool statuses properties are set', async () => {
  69     const pool = new FixedThreadPool(
  70       numberOfWorkers,
  71       './tests/worker-files/thread/testWorker.mjs'
  72     )
  73     expect(pool.started).toBe(true)
  74     expect(pool.starting).toBe(false)
  75     expect(pool.destroying).toBe(false)
  76     await pool.destroy()
  77   })
  78
  79   it('Verify that filePath is checked', () => {
  80     expect(() => new FixedThreadPool(numberOfWorkers)).toThrow(
  81       new TypeError('The worker file path must be specified')
  82     )
  83     expect(() => new FixedThreadPool(numberOfWorkers, 0)).toThrow(
  84       new TypeError('The worker file path must be a string')
  85     )
  86     expect(
  87       () => new FixedThreadPool(numberOfWorkers, './dummyWorker.ts')
  88     ).toThrow(new Error("Cannot find the worker file './dummyWorker.ts'"))
  89   })
  90
  91   it('Verify that numberOfWorkers is checked', () => {
  92     expect(
  93       () =>
  94         new FixedThreadPool(
  95           undefined,
  96           './tests/worker-files/thread/testWorker.mjs'
  97         )
  98     ).toThrow(
  99       new Error(
 100         'Cannot instantiate a pool without specifying the number of workers'
 101       )
 102     )
 103   })
 104
 105   it('Verify that a negative number of workers is checked', () => {
 106     expect(
 107       () =>
 108         new FixedClusterPool(-1, './tests/worker-files/cluster/testWorker.js')
 109     ).toThrow(
 110       new RangeError(
 111         'Cannot instantiate a pool with a negative number of workers'
 112       )
 113     )
 114   })
 115
 116   it('Verify that a non integer number of workers is checked', () => {
 117     expect(
 118       () =>
 119         new FixedThreadPool(0.25, './tests/worker-files/thread/testWorker.mjs')
 120     ).toThrow(
 121       new TypeError(
 122         'Cannot instantiate a pool with a non safe integer number of workers'
 123       )
 124     )
 125   })
 126
 127   it('Verify that pool arguments number and pool type are checked', () => {
 128     expect(
 129       () =>
 130         new FixedThreadPool(
 131           numberOfWorkers,
 132           './tests/worker-files/thread/testWorker.mjs',
 133           undefined,
 134           numberOfWorkers * 2
 135         )
 136     ).toThrow(
 137       new Error(
 138         'Cannot instantiate a fixed pool with a maximum number of workers specified at initialization'
 139       )
 140     )
 141   })
 142
 143   it('Verify that dynamic pool sizing is checked', () => {
 144     expect(
 145       () =>
 146         new DynamicClusterPool(
 147           1,
 148           undefined,
 149           './tests/worker-files/cluster/testWorker.js'
 150         )
 151     ).toThrow(
 152       new TypeError(
 153         'Cannot instantiate a dynamic pool without specifying the maximum pool size'
 154       )
 155     )
 156     expect(
 157       () =>
 158         new DynamicThreadPool(
 159           0.5,
 160           1,
 161           './tests/worker-files/thread/testWorker.mjs'
 162         )
 163     ).toThrow(
 164       new TypeError(
 165         'Cannot instantiate a pool with a non safe integer number of workers'
 166       )
 167     )
 168     expect(
 169       () =>
 170         new DynamicClusterPool(
 171           0,
 172           0.5,
 173           './tests/worker-files/cluster/testWorker.js'
 174         )
 175     ).toThrow(
 176       new TypeError(
 177         'Cannot instantiate a dynamic pool with a non safe integer maximum pool size'
 178       )
 179     )
 180     expect(
 181       () =>
 182         new DynamicThreadPool(
 183           2,
 184           1,
 185           './tests/worker-files/thread/testWorker.mjs'
 186         )
 187     ).toThrow(
 188       new RangeError(
 189         'Cannot instantiate a dynamic pool with a maximum pool size inferior to the minimum pool size'
 190       )
 191     )
 192     expect(
 193       () =>
 194         new DynamicThreadPool(
 195           0,
 196           0,
 197           './tests/worker-files/thread/testWorker.mjs'
 198         )
 199     ).toThrow(
 200       new RangeError(
 201         'Cannot instantiate a dynamic pool with a maximum pool size equal to zero'
 202       )
 203     )
 204     expect(
 205       () =>
 206         new DynamicClusterPool(
 207           1,
 208           1,
 209           './tests/worker-files/cluster/testWorker.js'
 210         )
 211     ).toThrow(
 212       new RangeError(
 213         'Cannot instantiate a dynamic pool with a minimum pool size equal to the maximum pool size. Use a fixed pool instead'
 214       )
 215     )
 216   })
 217
 218   it('Verify that pool options are checked', async () => {
 219     let pool = new FixedThreadPool(
 220       numberOfWorkers,
 221       './tests/worker-files/thread/testWorker.mjs'
 222     )
 223     expect(pool.emitter).toBeInstanceOf(EventEmitterAsyncResource)
 224     expect(pool.opts).toStrictEqual({
 225       startWorkers: true,
 226       enableEvents: true,
 227       restartWorkerOnError: true,
 228       enableTasksQueue: false,
 229       workerChoiceStrategy: WorkerChoiceStrategies.ROUND_ROBIN
 230     })
 231     expect(pool.workerChoiceStrategyContext.opts).toStrictEqual({
 232       retries:
 233         pool.info.maxSize +
 234         Object.keys(pool.workerChoiceStrategyContext.opts.weights).length,
 235       runTime: { median: false },
 236       waitTime: { median: false },
 237       elu: { median: false },
 238       weights: expect.objectContaining({
 239         0: expect.any(Number),
 240         [pool.info.maxSize - 1]: expect.any(Number)
 241       })
 242     })
 243     for (const [, workerChoiceStrategy] of pool.workerChoiceStrategyContext
 244       .workerChoiceStrategies) {
 245       expect(workerChoiceStrategy.opts).toStrictEqual(
 246         expect.objectContaining({
 247           retries:
 248             pool.info.maxSize +
 249             Object.keys(workerChoiceStrategy.opts.weights).length,
 250           runTime: { median: false },
 251           waitTime: { median: false },
 252           elu: { median: false }
 253         })
 254       )
 255     }
 256     await pool.destroy()
 257     const testHandler = () => console.info('test handler executed')
 258     pool = new FixedThreadPool(
 259       numberOfWorkers,
 260       './tests/worker-files/thread/testWorker.mjs',
 261       {
 262         workerChoiceStrategy: WorkerChoiceStrategies.LEAST_USED,
 263         workerChoiceStrategyOptions: {
 264           runTime: { median: true },
 265           weights: { 0: 300, 1: 200 }
 266         },
 267         enableEvents: false,
 268         restartWorkerOnError: false,
 269         enableTasksQueue: true,
 270         tasksQueueOptions: { concurrency: 2 },
 271         messageHandler: testHandler,
 272         errorHandler: testHandler,
 273         onlineHandler: testHandler,
 274         exitHandler: testHandler
 275       }
 276     )
 277     expect(pool.emitter).toBeUndefined()
 278     expect(pool.opts).toStrictEqual({
 279       startWorkers: true,
 280       enableEvents: false,
 281       restartWorkerOnError: false,
 282       enableTasksQueue: true,
 283       tasksQueueOptions: {
 284         concurrency: 2,
 285         size: Math.pow(numberOfWorkers, 2),
 286         taskStealing: true,
 287         tasksStealingOnBackPressure: true,
 288         tasksFinishedTimeout: 2000
 289       },
 290       workerChoiceStrategy: WorkerChoiceStrategies.LEAST_USED,
 291       workerChoiceStrategyOptions: {
 292         runTime: { median: true },
 293         weights: { 0: 300, 1: 200 }
 294       },
 295       onlineHandler: testHandler,
 296       messageHandler: testHandler,
 297       errorHandler: testHandler,
 298       exitHandler: testHandler
 299     })
 300     expect(pool.workerChoiceStrategyContext.opts).toStrictEqual({
 301       retries:
 302         pool.info.maxSize +
 303         Object.keys(pool.opts.workerChoiceStrategyOptions.weights).length,
 304       runTime: { median: true },
 305       waitTime: { median: false },
 306       elu: { median: false },
 307       weights: { 0: 300, 1: 200 }
 308     })
 309     for (const [, workerChoiceStrategy] of pool.workerChoiceStrategyContext
 310       .workerChoiceStrategies) {
 311       expect(workerChoiceStrategy.opts).toStrictEqual({
 312         retries:
 313           pool.info.maxSize +
 314           Object.keys(pool.opts.workerChoiceStrategyOptions.weights).length,
 315         runTime: { median: true },
 316         waitTime: { median: false },
 317         elu: { median: false },
 318         weights: { 0: 300, 1: 200 }
 319       })
 320     }
 321     await pool.destroy()
 322   })
 323
 324   it('Verify that pool options are validated', () => {
 325     expect(
 326       () =>
 327         new FixedThreadPool(
 328           numberOfWorkers,
 329           './tests/worker-files/thread/testWorker.mjs',
 330           {
 331             workerChoiceStrategy: 'invalidStrategy'
 332           }
 333         )
 334     ).toThrow(new Error("Invalid worker choice strategy 'invalidStrategy'"))
 335     expect(
 336       () =>
 337         new FixedThreadPool(
 338           numberOfWorkers,
 339           './tests/worker-files/thread/testWorker.mjs',
 340           {
 341             workerChoiceStrategyOptions: { weights: {} }
 342           }
 343         )
 344     ).toThrow(
 345       new Error(
 346         'Invalid worker choice strategy options: must have a weight for each worker node'
 347       )
 348     )
 349     expect(
 350       () =>
 351         new FixedThreadPool(
 352           numberOfWorkers,
 353           './tests/worker-files/thread/testWorker.mjs',
 354           {
 355             workerChoiceStrategyOptions: { measurement: 'invalidMeasurement' }
 356           }
 357         )
 358     ).toThrow(
 359       new Error(
 360         "Invalid worker choice strategy options: invalid measurement 'invalidMeasurement'"
 361       )
 362     )
 363     expect(
 364       () =>
 365         new FixedThreadPool(
 366           numberOfWorkers,
 367           './tests/worker-files/thread/testWorker.mjs',
 368           {
 369             enableTasksQueue: true,
 370             tasksQueueOptions: 'invalidTasksQueueOptions'
 371           }
 372         )
 373     ).toThrow(
 374       new TypeError('Invalid tasks queue options: must be a plain object')
 375     )
 376     expect(
 377       () =>
 378         new FixedThreadPool(
 379           numberOfWorkers,
 380           './tests/worker-files/thread/testWorker.mjs',
 381           {
 382             enableTasksQueue: true,
 383             tasksQueueOptions: { concurrency: 0 }
 384           }
 385         )
 386     ).toThrow(
 387       new RangeError(
 388         'Invalid worker node tasks concurrency: 0 is a negative integer or zero'
 389       )
 390     )
 391     expect(
 392       () =>
 393         new FixedThreadPool(
 394           numberOfWorkers,
 395           './tests/worker-files/thread/testWorker.mjs',
 396           {
 397             enableTasksQueue: true,
 398             tasksQueueOptions: { concurrency: -1 }
 399           }
 400         )
 401     ).toThrow(
 402       new RangeError(
 403         'Invalid worker node tasks concurrency: -1 is a negative integer or zero'
 404       )
 405     )
 406     expect(
 407       () =>
 408         new FixedThreadPool(
 409           numberOfWorkers,
 410           './tests/worker-files/thread/testWorker.mjs',
 411           {
 412             enableTasksQueue: true,
 413             tasksQueueOptions: { concurrency: 0.2 }
 414           }
 415         )
 416     ).toThrow(
 417       new TypeError('Invalid worker node tasks concurrency: must be an integer')
 418     )
 419     expect(
 420       () =>
 421         new FixedThreadPool(
 422           numberOfWorkers,
 423           './tests/worker-files/thread/testWorker.mjs',
 424           {
 425             enableTasksQueue: true,
 426             tasksQueueOptions: { size: 0 }
 427           }
 428         )
 429     ).toThrow(
 430       new RangeError(
 431         'Invalid worker node tasks queue size: 0 is a negative integer or zero'
 432       )
 433     )
 434     expect(
 435       () =>
 436         new FixedThreadPool(
 437           numberOfWorkers,
 438           './tests/worker-files/thread/testWorker.mjs',
 439           {
 440             enableTasksQueue: true,
 441             tasksQueueOptions: { size: -1 }
 442           }
 443         )
 444     ).toThrow(
 445       new RangeError(
 446         'Invalid worker node tasks queue size: -1 is a negative integer or zero'
 447       )
 448     )
 449     expect(
 450       () =>
 451         new FixedThreadPool(
 452           numberOfWorkers,
 453           './tests/worker-files/thread/testWorker.mjs',
 454           {
 455             enableTasksQueue: true,
 456             tasksQueueOptions: { size: 0.2 }
 457           }
 458         )
 459     ).toThrow(
 460       new TypeError('Invalid worker node tasks queue size: must be an integer')
 461     )
 462   })
 463
 464   it('Verify that pool worker choice strategy options can be set', async () => {
 465     const pool = new FixedThreadPool(
 466       numberOfWorkers,
 467       './tests/worker-files/thread/testWorker.mjs',
 468       { workerChoiceStrategy: WorkerChoiceStrategies.FAIR_SHARE }
 469     )
 470     expect(pool.opts.workerChoiceStrategyOptions).toBeUndefined()
 471     expect(pool.workerChoiceStrategyContext.opts).toStrictEqual({
 472       retries:
 473         pool.info.maxSize +
 474         Object.keys(pool.workerChoiceStrategyContext.opts.weights).length,
 475       runTime: { median: false },
 476       waitTime: { median: false },
 477       elu: { median: false },
 478       weights: expect.objectContaining({
 479         0: expect.any(Number),
 480         [pool.info.maxSize - 1]: expect.any(Number)
 481       })
 482     })
 483     for (const [, workerChoiceStrategy] of pool.workerChoiceStrategyContext
 484       .workerChoiceStrategies) {
 485       expect(workerChoiceStrategy.opts).toStrictEqual(
 486         expect.objectContaining({
 487           retries:
 488             pool.info.maxSize +
 489             Object.keys(workerChoiceStrategy.opts.weights).length,
 490           runTime: { median: false },
 491           waitTime: { median: false },
 492           elu: { median: false }
 493         })
 494       )
 495     }
 496     expect(
 497       pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
 498     ).toStrictEqual({
 499       runTime: {
 500         aggregate: true,
 501         average: true,
 502         median: false
 503       },
 504       waitTime: {
 505         aggregate: false,
 506         average: false,
 507         median: false
 508       },
 509       elu: {
 510         aggregate: true,
 511         average: true,
 512         median: false
 513       }
 514     })
 515     pool.setWorkerChoiceStrategyOptions({
 516       runTime: { median: true },
 517       elu: { median: true }
 518     })
 519     expect(pool.opts.workerChoiceStrategyOptions).toStrictEqual({
 520       runTime: { median: true },
 521       elu: { median: true }
 522     })
 523     expect(pool.workerChoiceStrategyContext.opts).toStrictEqual({
 524       retries:
 525         pool.info.maxSize +
 526         Object.keys(pool.workerChoiceStrategyContext.opts.weights).length,
 527       runTime: { median: true },
 528       waitTime: { median: false },
 529       elu: { median: true },
 530       weights: expect.objectContaining({
 531         0: expect.any(Number),
 532         [pool.info.maxSize - 1]: expect.any(Number)
 533       })
 534     })
 535     for (const [, workerChoiceStrategy] of pool.workerChoiceStrategyContext
 536       .workerChoiceStrategies) {
 537       expect(workerChoiceStrategy.opts).toStrictEqual(
 538         expect.objectContaining({
 539           retries:
 540             pool.info.maxSize +
 541             Object.keys(workerChoiceStrategy.opts.weights).length,
 542           runTime: { median: true },
 543           waitTime: { median: false },
 544           elu: { median: true }
 545         })
 546       )
 547     }
 548     expect(
 549       pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
 550     ).toStrictEqual({
 551       runTime: {
 552         aggregate: true,
 553         average: false,
 554         median: true
 555       },
 556       waitTime: {
 557         aggregate: false,
 558         average: false,
 559         median: false
 560       },
 561       elu: {
 562         aggregate: true,
 563         average: false,
 564         median: true
 565       }
 566     })
 567     pool.setWorkerChoiceStrategyOptions({
 568       runTime: { median: false },
 569       elu: { median: false }
 570     })
 571     expect(pool.opts.workerChoiceStrategyOptions).toStrictEqual({
 572       runTime: { median: false },
 573       elu: { median: false }
 574     })
 575     expect(pool.workerChoiceStrategyContext.opts).toStrictEqual({
 576       retries:
 577         pool.info.maxSize +
 578         Object.keys(pool.workerChoiceStrategyContext.opts.weights).length,
 579       runTime: { median: false },
 580       waitTime: { median: false },
 581       elu: { median: false },
 582       weights: expect.objectContaining({
 583         0: expect.any(Number),
 584         [pool.info.maxSize - 1]: expect.any(Number)
 585       })
 586     })
 587     for (const [, workerChoiceStrategy] of pool.workerChoiceStrategyContext
 588       .workerChoiceStrategies) {
 589       expect(workerChoiceStrategy.opts).toStrictEqual(
 590         expect.objectContaining({
 591           retries:
 592             pool.info.maxSize +
 593             Object.keys(workerChoiceStrategy.opts.weights).length,
 594           runTime: { median: false },
 595           waitTime: { median: false },
 596           elu: { median: false }
 597         })
 598       )
 599     }
 600     expect(
 601       pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
 602     ).toStrictEqual({
 603       runTime: {
 604         aggregate: true,
 605         average: true,
 606         median: false
 607       },
 608       waitTime: {
 609         aggregate: false,
 610         average: false,
 611         median: false
 612       },
 613       elu: {
 614         aggregate: true,
 615         average: true,
 616         median: false
 617       }
 618     })
 619     expect(() =>
 620       pool.setWorkerChoiceStrategyOptions('invalidWorkerChoiceStrategyOptions')
 621     ).toThrow(
 622       new TypeError(
 623         'Invalid worker choice strategy options: must be a plain object'
 624       )
 625     )
 626     expect(() => pool.setWorkerChoiceStrategyOptions({ weights: {} })).toThrow(
 627       new Error(
 628         'Invalid worker choice strategy options: must have a weight for each worker node'
 629       )
 630     )
 631     expect(() =>
 632       pool.setWorkerChoiceStrategyOptions({ measurement: 'invalidMeasurement' })
 633     ).toThrow(
 634       new Error(
 635         "Invalid worker choice strategy options: invalid measurement 'invalidMeasurement'"
 636       )
 637     )
 638     await pool.destroy()
 639   })
 640
 641   it('Verify that pool tasks queue can be enabled/disabled', async () => {
 642     const pool = new FixedThreadPool(
 643       numberOfWorkers,
 644       './tests/worker-files/thread/testWorker.mjs'
 645     )
 646     expect(pool.opts.enableTasksQueue).toBe(false)
 647     expect(pool.opts.tasksQueueOptions).toBeUndefined()
 648     pool.enableTasksQueue(true)
 649     expect(pool.opts.enableTasksQueue).toBe(true)
 650     expect(pool.opts.tasksQueueOptions).toStrictEqual({
 651       concurrency: 1,
 652       size: Math.pow(numberOfWorkers, 2),
 653       taskStealing: true,
 654       tasksStealingOnBackPressure: true,
 655       tasksFinishedTimeout: 2000
 656     })
 657     pool.enableTasksQueue(true, { concurrency: 2 })
 658     expect(pool.opts.enableTasksQueue).toBe(true)
 659     expect(pool.opts.tasksQueueOptions).toStrictEqual({
 660       concurrency: 2,
 661       size: Math.pow(numberOfWorkers, 2),
 662       taskStealing: true,
 663       tasksStealingOnBackPressure: true,
 664       tasksFinishedTimeout: 2000
 665     })
 666     pool.enableTasksQueue(false)
 667     expect(pool.opts.enableTasksQueue).toBe(false)
 668     expect(pool.opts.tasksQueueOptions).toBeUndefined()
 669     await pool.destroy()
 670   })
 671
 672   it('Verify that pool tasks queue options can be set', async () => {
 673     const pool = new FixedThreadPool(
 674       numberOfWorkers,
 675       './tests/worker-files/thread/testWorker.mjs',
 676       { enableTasksQueue: true }
 677     )
 678     expect(pool.opts.tasksQueueOptions).toStrictEqual({
 679       concurrency: 1,
 680       size: Math.pow(numberOfWorkers, 2),
 681       taskStealing: true,
 682       tasksStealingOnBackPressure: true,
 683       tasksFinishedTimeout: 2000
 684     })
 685     for (const workerNode of pool.workerNodes) {
 686       expect(workerNode.tasksQueueBackPressureSize).toBe(
 687         pool.opts.tasksQueueOptions.size
 688       )
 689     }
 690     pool.setTasksQueueOptions({
 691       concurrency: 2,
 692       size: 2,
 693       taskStealing: false,
 694       tasksStealingOnBackPressure: false,
 695       tasksFinishedTimeout: 3000
 696     })
 697     expect(pool.opts.tasksQueueOptions).toStrictEqual({
 698       concurrency: 2,
 699       size: 2,
 700       taskStealing: false,
 701       tasksStealingOnBackPressure: false,
 702       tasksFinishedTimeout: 3000
 703     })
 704     for (const workerNode of pool.workerNodes) {
 705       expect(workerNode.tasksQueueBackPressureSize).toBe(
 706         pool.opts.tasksQueueOptions.size
 707       )
 708     }
 709     pool.setTasksQueueOptions({
 710       concurrency: 1,
 711       taskStealing: true,
 712       tasksStealingOnBackPressure: true
 713     })
 714     expect(pool.opts.tasksQueueOptions).toStrictEqual({
 715       concurrency: 1,
 716       size: Math.pow(numberOfWorkers, 2),
 717       taskStealing: true,
 718       tasksStealingOnBackPressure: true,
 719       tasksFinishedTimeout: 2000
 720     })
 721     for (const workerNode of pool.workerNodes) {
 722       expect(workerNode.tasksQueueBackPressureSize).toBe(
 723         pool.opts.tasksQueueOptions.size
 724       )
 725     }
 726     expect(() => pool.setTasksQueueOptions('invalidTasksQueueOptions')).toThrow(
 727       new TypeError('Invalid tasks queue options: must be a plain object')
 728     )
 729     expect(() => pool.setTasksQueueOptions({ concurrency: 0 })).toThrow(
 730       new RangeError(
 731         'Invalid worker node tasks concurrency: 0 is a negative integer or zero'
 732       )
 733     )
 734     expect(() => pool.setTasksQueueOptions({ concurrency: -1 })).toThrow(
 735       new RangeError(
 736         'Invalid worker node tasks concurrency: -1 is a negative integer or zero'
 737       )
 738     )
 739     expect(() => pool.setTasksQueueOptions({ concurrency: 0.2 })).toThrow(
 740       new TypeError('Invalid worker node tasks concurrency: must be an integer')
 741     )
 742     expect(() => pool.setTasksQueueOptions({ size: 0 })).toThrow(
 743       new RangeError(
 744         'Invalid worker node tasks queue size: 0 is a negative integer or zero'
 745       )
 746     )
 747     expect(() => pool.setTasksQueueOptions({ size: -1 })).toThrow(
 748       new RangeError(
 749         'Invalid worker node tasks queue size: -1 is a negative integer or zero'
 750       )
 751     )
 752     expect(() => pool.setTasksQueueOptions({ size: 0.2 })).toThrow(
 753       new TypeError('Invalid worker node tasks queue size: must be an integer')
 754     )
 755     await pool.destroy()
 756   })
 757
 758   it('Verify that pool info is set', async () => {
 759     let pool = new FixedThreadPool(
 760       numberOfWorkers,
 761       './tests/worker-files/thread/testWorker.mjs'
 762     )
 763     expect(pool.info).toStrictEqual({
 764       version,
 765       type: PoolTypes.fixed,
 766       worker: WorkerTypes.thread,
 767       started: true,
 768       ready: true,
 769       strategy: WorkerChoiceStrategies.ROUND_ROBIN,
 770       minSize: numberOfWorkers,
 771       maxSize: numberOfWorkers,
 772       workerNodes: numberOfWorkers,
 773       idleWorkerNodes: numberOfWorkers,
 774       busyWorkerNodes: 0,
 775       executedTasks: 0,
 776       executingTasks: 0,
 777       failedTasks: 0
 778     })
 779     await pool.destroy()
 780     pool = new DynamicClusterPool(
 781       Math.floor(numberOfWorkers / 2),
 782       numberOfWorkers,
 783       './tests/worker-files/cluster/testWorker.js'
 784     )
 785     expect(pool.info).toStrictEqual({
 786       version,
 787       type: PoolTypes.dynamic,
 788       worker: WorkerTypes.cluster,
 789       started: true,
 790       ready: true,
 791       strategy: WorkerChoiceStrategies.ROUND_ROBIN,
 792       minSize: Math.floor(numberOfWorkers / 2),
 793       maxSize: numberOfWorkers,
 794       workerNodes: Math.floor(numberOfWorkers / 2),
 795       idleWorkerNodes: Math.floor(numberOfWorkers / 2),
 796       busyWorkerNodes: 0,
 797       executedTasks: 0,
 798       executingTasks: 0,
 799       failedTasks: 0
 800     })
 801     await pool.destroy()
 802   })
 803
 804   it('Verify that pool worker tasks usage are initialized', async () => {
 805     const pool = new FixedClusterPool(
 806       numberOfWorkers,
 807       './tests/worker-files/cluster/testWorker.js'
 808     )
 809     for (const workerNode of pool.workerNodes) {
 810       expect(workerNode).toBeInstanceOf(WorkerNode)
 811       expect(workerNode.usage).toStrictEqual({
 812         tasks: {
 813           executed: 0,
 814           executing: 0,
 815           queued: 0,
 816           maxQueued: 0,
 817           sequentiallyStolen: 0,
 818           stolen: 0,
 819           failed: 0
 820         },
 821         runTime: {
 822           history: new CircularArray()
 823         },
 824         waitTime: {
 825           history: new CircularArray()
 826         },
 827         elu: {
 828           idle: {
 829             history: new CircularArray()
 830           },
 831           active: {
 832             history: new CircularArray()
 833           }
 834         }
 835       })
 836     }
 837     await pool.destroy()
 838   })
 839
 840   it('Verify that pool worker tasks queue are initialized', async () => {
 841     let pool = new FixedClusterPool(
 842       numberOfWorkers,
 843       './tests/worker-files/cluster/testWorker.js'
 844     )
 845     for (const workerNode of pool.workerNodes) {
 846       expect(workerNode).toBeInstanceOf(WorkerNode)
 847       expect(workerNode.tasksQueue).toBeInstanceOf(Deque)
 848       expect(workerNode.tasksQueue.size).toBe(0)
 849       expect(workerNode.tasksQueue.maxSize).toBe(0)
 850     }
 851     await pool.destroy()
 852     pool = new DynamicThreadPool(
 853       Math.floor(numberOfWorkers / 2),
 854       numberOfWorkers,
 855       './tests/worker-files/thread/testWorker.mjs'
 856     )
 857     for (const workerNode of pool.workerNodes) {
 858       expect(workerNode).toBeInstanceOf(WorkerNode)
 859       expect(workerNode.tasksQueue).toBeInstanceOf(Deque)
 860       expect(workerNode.tasksQueue.size).toBe(0)
 861       expect(workerNode.tasksQueue.maxSize).toBe(0)
 862     }
 863     await pool.destroy()
 864   })
 865
 866   it('Verify that pool worker info are initialized', async () => {
 867     let pool = new FixedClusterPool(
 868       numberOfWorkers,
 869       './tests/worker-files/cluster/testWorker.js'
 870     )
 871     for (const workerNode of pool.workerNodes) {
 872       expect(workerNode).toBeInstanceOf(WorkerNode)
 873       expect(workerNode.info).toStrictEqual({
 874         id: expect.any(Number),
 875         type: WorkerTypes.cluster,
 876         dynamic: false,
 877         ready: true
 878       })
 879     }
 880     await pool.destroy()
 881     pool = new DynamicThreadPool(
 882       Math.floor(numberOfWorkers / 2),
 883       numberOfWorkers,
 884       './tests/worker-files/thread/testWorker.mjs'
 885     )
 886     for (const workerNode of pool.workerNodes) {
 887       expect(workerNode).toBeInstanceOf(WorkerNode)
 888       expect(workerNode.info).toStrictEqual({
 889         id: expect.any(Number),
 890         type: WorkerTypes.thread,
 891         dynamic: false,
 892         ready: true
 893       })
 894     }
 895     await pool.destroy()
 896   })
 897
 898   it('Verify that pool statuses are checked at start or destroy', async () => {
 899     const pool = new FixedThreadPool(
 900       numberOfWorkers,
 901       './tests/worker-files/thread/testWorker.mjs'
 902     )
 903     expect(pool.info.started).toBe(true)
 904     expect(pool.info.ready).toBe(true)
 905     expect(() => pool.start()).toThrow(
 906       new Error('Cannot start an already started pool')
 907     )
 908     await pool.destroy()
 909     expect(pool.info.started).toBe(false)
 910     expect(pool.info.ready).toBe(false)
 911     await expect(pool.destroy()).rejects.toThrow(
 912       new Error('Cannot destroy an already destroyed pool')
 913     )
 914   })
 915
 916   it('Verify that pool can be started after initialization', async () => {
 917     const pool = new FixedClusterPool(
 918       numberOfWorkers,
 919       './tests/worker-files/cluster/testWorker.js',
 920       {
 921         startWorkers: false
 922       }
 923     )
 924     expect(pool.info.started).toBe(false)
 925     expect(pool.info.ready).toBe(false)
 926     expect(pool.readyEventEmitted).toBe(false)
 927     expect(pool.workerNodes).toStrictEqual([])
 928     await expect(pool.execute()).rejects.toThrow(
 929       new Error('Cannot execute a task on not started pool')
 930     )
 931     pool.start()
 932     expect(pool.info.started).toBe(true)
 933     expect(pool.info.ready).toBe(true)
 934     await waitPoolEvents(pool, PoolEvents.ready, 1)
 935     expect(pool.readyEventEmitted).toBe(true)
 936     expect(pool.workerNodes.length).toBe(numberOfWorkers)
 937     for (const workerNode of pool.workerNodes) {
 938       expect(workerNode).toBeInstanceOf(WorkerNode)
 939     }
 940     await pool.destroy()
 941   })
 942
 943   it('Verify that pool execute() arguments are checked', async () => {
 944     const pool = new FixedClusterPool(
 945       numberOfWorkers,
 946       './tests/worker-files/cluster/testWorker.js'
 947     )
 948     await expect(pool.execute(undefined, 0)).rejects.toThrow(
 949       new TypeError('name argument must be a string')
 950     )
 951     await expect(pool.execute(undefined, '')).rejects.toThrow(
 952       new TypeError('name argument must not be an empty string')
 953     )
 954     await expect(pool.execute(undefined, undefined, {})).rejects.toThrow(
 955       new TypeError('transferList argument must be an array')
 956     )
 957     await expect(pool.execute(undefined, 'unknown')).rejects.toBe(
 958       "Task function 'unknown' not found"
 959     )
 960     await pool.destroy()
 961     await expect(pool.execute()).rejects.toThrow(
 962       new Error('Cannot execute a task on not started pool')
 963     )
 964   })
 965
 966   it('Verify that pool worker tasks usage are computed', async () => {
 967     const pool = new FixedClusterPool(
 968       numberOfWorkers,
 969       './tests/worker-files/cluster/testWorker.js'
 970     )
 971     const promises = new Set()
 972     const maxMultiplier = 2
 973     for (let i = 0; i < numberOfWorkers * maxMultiplier; i++) {
 974       promises.add(pool.execute())
 975     }
 976     for (const workerNode of pool.workerNodes) {
 977       expect(workerNode.usage).toStrictEqual({
 978         tasks: {
 979           executed: 0,
 980           executing: maxMultiplier,
 981           queued: 0,
 982           maxQueued: 0,
 983           sequentiallyStolen: 0,
 984           stolen: 0,
 985           failed: 0
 986         },
 987         runTime: {
 988           history: expect.any(CircularArray)
 989         },
 990         waitTime: {
 991           history: expect.any(CircularArray)
 992         },
 993         elu: {
 994           idle: {
 995             history: expect.any(CircularArray)
 996           },
 997           active: {
 998             history: expect.any(CircularArray)
 999           }
1000         }
1001       })
1002     }
1003     await Promise.all(promises)
1004     for (const workerNode of pool.workerNodes) {
1005       expect(workerNode.usage).toStrictEqual({
1006         tasks: {
1007           executed: maxMultiplier,
1008           executing: 0,
1009           queued: 0,
1010           maxQueued: 0,
1011           sequentiallyStolen: 0,
1012           stolen: 0,
1013           failed: 0
1014         },
1015         runTime: {
1016           history: expect.any(CircularArray)
1017         },
1018         waitTime: {
1019           history: expect.any(CircularArray)
1020         },
1021         elu: {
1022           idle: {
1023             history: expect.any(CircularArray)
1024           },
1025           active: {
1026             history: expect.any(CircularArray)
1027           }
1028         }
1029       })
1030     }
1031     await pool.destroy()
1032   })
1033
1034   it('Verify that pool worker tasks usage are reset at worker choice strategy change', async () => {
1035     const pool = new DynamicThreadPool(
1036       Math.floor(numberOfWorkers / 2),
1037       numberOfWorkers,
1038       './tests/worker-files/thread/testWorker.mjs'
1039     )
1040     const promises = new Set()
1041     const maxMultiplier = 2
1042     for (let i = 0; i < numberOfWorkers * maxMultiplier; i++) {
1043       promises.add(pool.execute())
1044     }
1045     await Promise.all(promises)
1046     for (const workerNode of pool.workerNodes) {
1047       expect(workerNode.usage).toStrictEqual({
1048         tasks: {
1049           executed: expect.any(Number),
1050           executing: 0,
1051           queued: 0,
1052           maxQueued: 0,
1053           sequentiallyStolen: 0,
1054           stolen: 0,
1055           failed: 0
1056         },
1057         runTime: {
1058           history: expect.any(CircularArray)
1059         },
1060         waitTime: {
1061           history: expect.any(CircularArray)
1062         },
1063         elu: {
1064           idle: {
1065             history: expect.any(CircularArray)
1066           },
1067           active: {
1068             history: expect.any(CircularArray)
1069           }
1070         }
1071       })
1072       expect(workerNode.usage.tasks.executed).toBeGreaterThan(0)
1073       expect(workerNode.usage.tasks.executed).toBeLessThanOrEqual(
1074         numberOfWorkers * maxMultiplier
1075       )
1076       expect(workerNode.usage.runTime.history.length).toBe(0)
1077       expect(workerNode.usage.waitTime.history.length).toBe(0)
1078       expect(workerNode.usage.elu.idle.history.length).toBe(0)
1079       expect(workerNode.usage.elu.active.history.length).toBe(0)
1080     }
1081     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
1082     for (const workerNode of pool.workerNodes) {
1083       expect(workerNode.usage).toStrictEqual({
1084         tasks: {
1085           executed: 0,
1086           executing: 0,
1087           queued: 0,
1088           maxQueued: 0,
1089           sequentiallyStolen: 0,
1090           stolen: 0,
1091           failed: 0
1092         },
1093         runTime: {
1094           history: expect.any(CircularArray)
1095         },
1096         waitTime: {
1097           history: expect.any(CircularArray)
1098         },
1099         elu: {
1100           idle: {
1101             history: expect.any(CircularArray)
1102           },
1103           active: {
1104             history: expect.any(CircularArray)
1105           }
1106         }
1107       })
1108       expect(workerNode.usage.runTime.history.length).toBe(0)
1109       expect(workerNode.usage.waitTime.history.length).toBe(0)
1110       expect(workerNode.usage.elu.idle.history.length).toBe(0)
1111       expect(workerNode.usage.elu.active.history.length).toBe(0)
1112     }
1113     await pool.destroy()
1114   })
1115
1116   it("Verify that pool event emitter 'ready' event can register a callback", async () => {
1117     const pool = new DynamicClusterPool(
1118       Math.floor(numberOfWorkers / 2),
1119       numberOfWorkers,
1120       './tests/worker-files/cluster/testWorker.js'
1121     )
1122     expect(pool.emitter.eventNames()).toStrictEqual([])
1123     let poolInfo
1124     let poolReady = 0
1125     pool.emitter.on(PoolEvents.ready, info => {
1126       ++poolReady
1127       poolInfo = info
1128     })
1129     await waitPoolEvents(pool, PoolEvents.ready, 1)
1130     expect(pool.emitter.eventNames()).toStrictEqual([PoolEvents.ready])
1131     expect(poolReady).toBe(1)
1132     expect(poolInfo).toStrictEqual({
1133       version,
1134       type: PoolTypes.dynamic,
1135       worker: WorkerTypes.cluster,
1136       started: true,
1137       ready: true,
1138       strategy: WorkerChoiceStrategies.ROUND_ROBIN,
1139       minSize: expect.any(Number),
1140       maxSize: expect.any(Number),
1141       workerNodes: expect.any(Number),
1142       idleWorkerNodes: expect.any(Number),
1143       busyWorkerNodes: expect.any(Number),
1144       executedTasks: expect.any(Number),
1145       executingTasks: expect.any(Number),
1146       failedTasks: expect.any(Number)
1147     })
1148     await pool.destroy()
1149   })
1150
1151   it("Verify that pool event emitter 'busy' event can register a callback", async () => {
1152     const pool = new FixedThreadPool(
1153       numberOfWorkers,
1154       './tests/worker-files/thread/testWorker.mjs'
1155     )
1156     expect(pool.emitter.eventNames()).toStrictEqual([])
1157     const promises = new Set()
1158     let poolBusy = 0
1159     let poolInfo
1160     pool.emitter.on(PoolEvents.busy, info => {
1161       ++poolBusy
1162       poolInfo = info
1163     })
1164     expect(pool.emitter.eventNames()).toStrictEqual([PoolEvents.busy])
1165     for (let i = 0; i < numberOfWorkers * 2; i++) {
1166       promises.add(pool.execute())
1167     }
1168     await Promise.all(promises)
1169     // The `busy` event is triggered when the number of submitted tasks at once reach the number of fixed pool workers.
1170     // So in total numberOfWorkers + 1 times for a loop submitting up to numberOfWorkers * 2 tasks to the fixed pool.
1171     expect(poolBusy).toBe(numberOfWorkers + 1)
1172     expect(poolInfo).toStrictEqual({
1173       version,
1174       type: PoolTypes.fixed,
1175       worker: WorkerTypes.thread,
1176       started: true,
1177       ready: true,
1178       strategy: WorkerChoiceStrategies.ROUND_ROBIN,
1179       minSize: expect.any(Number),
1180       maxSize: expect.any(Number),
1181       workerNodes: expect.any(Number),
1182       idleWorkerNodes: expect.any(Number),
1183       busyWorkerNodes: expect.any(Number),
1184       executedTasks: expect.any(Number),
1185       executingTasks: expect.any(Number),
1186       failedTasks: expect.any(Number)
1187     })
1188     await pool.destroy()
1189   })
1190
1191   it("Verify that pool event emitter 'full' event can register a callback", async () => {
1192     const pool = new DynamicThreadPool(
1193       Math.floor(numberOfWorkers / 2),
1194       numberOfWorkers,
1195       './tests/worker-files/thread/testWorker.mjs'
1196     )
1197     expect(pool.emitter.eventNames()).toStrictEqual([])
1198     const promises = new Set()
1199     let poolFull = 0
1200     let poolInfo
1201     pool.emitter.on(PoolEvents.full, info => {
1202       ++poolFull
1203       poolInfo = info
1204     })
1205     expect(pool.emitter.eventNames()).toStrictEqual([PoolEvents.full])
1206     for (let i = 0; i < numberOfWorkers * 2; i++) {
1207       promises.add(pool.execute())
1208     }
1209     await Promise.all(promises)
1210     expect(poolFull).toBe(1)
1211     expect(poolInfo).toStrictEqual({
1212       version,
1213       type: PoolTypes.dynamic,
1214       worker: WorkerTypes.thread,
1215       started: true,
1216       ready: true,
1217       strategy: WorkerChoiceStrategies.ROUND_ROBIN,
1218       minSize: expect.any(Number),
1219       maxSize: expect.any(Number),
1220       workerNodes: expect.any(Number),
1221       idleWorkerNodes: expect.any(Number),
1222       busyWorkerNodes: expect.any(Number),
1223       executedTasks: expect.any(Number),
1224       executingTasks: expect.any(Number),
1225       failedTasks: expect.any(Number)
1226     })
1227     await pool.destroy()
1228   })
1229
1230   it("Verify that pool event emitter 'backPressure' event can register a callback", async () => {
1231     const pool = new FixedThreadPool(
1232       numberOfWorkers,
1233       './tests/worker-files/thread/testWorker.mjs',
1234       {
1235         enableTasksQueue: true
1236       }
1237     )
1238     stub(pool, 'hasBackPressure').returns(true)
1239     expect(pool.emitter.eventNames()).toStrictEqual([])
1240     const promises = new Set()
1241     let poolBackPressure = 0
1242     let poolInfo
1243     pool.emitter.on(PoolEvents.backPressure, info => {
1244       ++poolBackPressure
1245       poolInfo = info
1246     })
1247     expect(pool.emitter.eventNames()).toStrictEqual([PoolEvents.backPressure])
1248     for (let i = 0; i < numberOfWorkers + 1; i++) {
1249       promises.add(pool.execute())
1250     }
1251     await Promise.all(promises)
1252     expect(poolBackPressure).toBe(1)
1253     expect(poolInfo).toStrictEqual({
1254       version,
1255       type: PoolTypes.fixed,
1256       worker: WorkerTypes.thread,
1257       started: true,
1258       ready: true,
1259       strategy: WorkerChoiceStrategies.ROUND_ROBIN,
1260       minSize: expect.any(Number),
1261       maxSize: expect.any(Number),
1262       workerNodes: expect.any(Number),
1263       idleWorkerNodes: expect.any(Number),
1264       busyWorkerNodes: expect.any(Number),
1265       executedTasks: expect.any(Number),
1266       executingTasks: expect.any(Number),
1267       maxQueuedTasks: expect.any(Number),
1268       queuedTasks: expect.any(Number),
1269       backPressure: true,
1270       stolenTasks: expect.any(Number),
1271       failedTasks: expect.any(Number)
1272     })
1273     expect(pool.hasBackPressure.callCount).toBe(5)
1274     await pool.destroy()
1275   })
1276
1277   it('Verify that destroy() waits for queued tasks to finish', async () => {
1278     const tasksFinishedTimeout = 2500
1279     const pool = new FixedThreadPool(
1280       numberOfWorkers,
1281       './tests/worker-files/thread/asyncWorker.mjs',
1282       {
1283         enableTasksQueue: true,
1284         tasksQueueOptions: { tasksFinishedTimeout }
1285       }
1286     )
1287     const maxMultiplier = 4
1288     let tasksFinished = 0
1289     for (const workerNode of pool.workerNodes) {
1290       workerNode.on('taskFinished', () => {
1291         ++tasksFinished
1292       })
1293     }
1294     for (let i = 0; i < numberOfWorkers * maxMultiplier; i++) {
1295       pool.execute()
1296     }
1297     expect(pool.info.queuedTasks).toBeGreaterThan(0)
1298     const startTime = performance.now()
1299     await pool.destroy()
1300     const elapsedTime = performance.now() - startTime
1301     expect(tasksFinished).toBeGreaterThanOrEqual(numberOfWorkers)
1302     expect(tasksFinished).toBeLessThanOrEqual(numberOfWorkers * maxMultiplier)
1303     expect(elapsedTime).toBeGreaterThanOrEqual(2000)
1304     expect(elapsedTime).toBeLessThanOrEqual(tasksFinishedTimeout + 100)
1305   })
1306
1307   it('Verify that destroy() waits until the tasks finished timeout is reached', async () => {
1308     const tasksFinishedTimeout = 1000
1309     const pool = new FixedThreadPool(
1310       numberOfWorkers,
1311       './tests/worker-files/thread/asyncWorker.mjs',
1312       {
1313         enableTasksQueue: true,
1314         tasksQueueOptions: { tasksFinishedTimeout }
1315       }
1316     )
1317     const maxMultiplier = 4
1318     let tasksFinished = 0
1319     for (const workerNode of pool.workerNodes) {
1320       workerNode.on('taskFinished', () => {
1321         ++tasksFinished
1322       })
1323     }
1324     for (let i = 0; i < numberOfWorkers * maxMultiplier; i++) {
1325       pool.execute()
1326     }
1327     expect(pool.info.queuedTasks).toBeGreaterThan(0)
1328     const startTime = performance.now()
1329     await pool.destroy()
1330     const elapsedTime = performance.now() - startTime
1331     expect(tasksFinished).toBe(0)
1332     expect(elapsedTime).toBeLessThanOrEqual(tasksFinishedTimeout + 800)
1333   })
1334
1335   it('Verify that pool asynchronous resource track tasks execution', async () => {
1336     let taskAsyncId
1337     let initCalls = 0
1338     let beforeCalls = 0
1339     let afterCalls = 0
1340     let resolveCalls = 0
1341     const hook = createHook({
1342       init (asyncId, type) {
1343         if (type === 'poolifier:task') {
1344           initCalls++
1345           taskAsyncId = asyncId
1346         }
1347       },
1348       before (asyncId) {
1349         if (asyncId === taskAsyncId) beforeCalls++
1350       },
1351       after (asyncId) {
1352         if (asyncId === taskAsyncId) afterCalls++
1353       },
1354       promiseResolve () {
1355         if (executionAsyncId() === taskAsyncId) resolveCalls++
1356       }
1357     })
1358     const pool = new FixedThreadPool(
1359       numberOfWorkers,
1360       './tests/worker-files/thread/testWorker.mjs'
1361     )
1362     hook.enable()
1363     await pool.execute()
1364     hook.disable()
1365     expect(initCalls).toBe(1)
1366     expect(beforeCalls).toBe(1)
1367     expect(afterCalls).toBe(1)
1368     expect(resolveCalls).toBe(1)
1369     await pool.destroy()
1370   })
1371
1372   it('Verify that hasTaskFunction() is working', async () => {
1373     const dynamicThreadPool = new DynamicThreadPool(
1374       Math.floor(numberOfWorkers / 2),
1375       numberOfWorkers,
1376       './tests/worker-files/thread/testMultipleTaskFunctionsWorker.mjs'
1377     )
1378     await waitPoolEvents(dynamicThreadPool, PoolEvents.ready, 1)
1379     expect(dynamicThreadPool.hasTaskFunction(DEFAULT_TASK_NAME)).toBe(true)
1380     expect(dynamicThreadPool.hasTaskFunction('jsonIntegerSerialization')).toBe(
1381       true
1382     )
1383     expect(dynamicThreadPool.hasTaskFunction('factorial')).toBe(true)
1384     expect(dynamicThreadPool.hasTaskFunction('fibonacci')).toBe(true)
1385     expect(dynamicThreadPool.hasTaskFunction('unknown')).toBe(false)
1386     await dynamicThreadPool.destroy()
1387     const fixedClusterPool = new FixedClusterPool(
1388       numberOfWorkers,
1389       './tests/worker-files/cluster/testMultipleTaskFunctionsWorker.js'
1390     )
1391     await waitPoolEvents(fixedClusterPool, PoolEvents.ready, 1)
1392     expect(fixedClusterPool.hasTaskFunction(DEFAULT_TASK_NAME)).toBe(true)
1393     expect(fixedClusterPool.hasTaskFunction('jsonIntegerSerialization')).toBe(
1394       true
1395     )
1396     expect(fixedClusterPool.hasTaskFunction('factorial')).toBe(true)
1397     expect(fixedClusterPool.hasTaskFunction('fibonacci')).toBe(true)
1398     expect(fixedClusterPool.hasTaskFunction('unknown')).toBe(false)
1399     await fixedClusterPool.destroy()
1400   })
1401
1402   it('Verify that addTaskFunction() is working', async () => {
1403     const dynamicThreadPool = new DynamicThreadPool(
1404       Math.floor(numberOfWorkers / 2),
1405       numberOfWorkers,
1406       './tests/worker-files/thread/testWorker.mjs'
1407     )
1408     await waitPoolEvents(dynamicThreadPool, PoolEvents.ready, 1)
1409     await expect(
1410       dynamicThreadPool.addTaskFunction(0, () => {})
1411     ).rejects.toThrow(new TypeError('name argument must be a string'))
1412     await expect(
1413       dynamicThreadPool.addTaskFunction('', () => {})
1414     ).rejects.toThrow(
1415       new TypeError('name argument must not be an empty string')
1416     )
1417     await expect(dynamicThreadPool.addTaskFunction('test', 0)).rejects.toThrow(
1418       new TypeError('fn argument must be a function')
1419     )
1420     await expect(dynamicThreadPool.addTaskFunction('test', '')).rejects.toThrow(
1421       new TypeError('fn argument must be a function')
1422     )
1423     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1424       DEFAULT_TASK_NAME,
1425       'test'
1426     ])
1427     const echoTaskFunction = data => {
1428       return data
1429     }
1430     await expect(
1431       dynamicThreadPool.addTaskFunction('echo', echoTaskFunction)
1432     ).resolves.toBe(true)
1433     expect(dynamicThreadPool.taskFunctions.size).toBe(1)
1434     expect(dynamicThreadPool.taskFunctions.get('echo')).toStrictEqual(
1435       echoTaskFunction
1436     )
1437     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1438       DEFAULT_TASK_NAME,
1439       'test',
1440       'echo'
1441     ])
1442     const taskFunctionData = { test: 'test' }
1443     const echoResult = await dynamicThreadPool.execute(taskFunctionData, 'echo')
1444     expect(echoResult).toStrictEqual(taskFunctionData)
1445     for (const workerNode of dynamicThreadPool.workerNodes) {
1446       expect(workerNode.getTaskFunctionWorkerUsage('echo')).toStrictEqual({
1447         tasks: {
1448           executed: expect.any(Number),
1449           executing: 0,
1450           queued: 0,
1451           sequentiallyStolen: 0,
1452           stolen: 0,
1453           failed: 0
1454         },
1455         runTime: {
1456           history: new CircularArray()
1457         },
1458         waitTime: {
1459           history: new CircularArray()
1460         },
1461         elu: {
1462           idle: {
1463             history: new CircularArray()
1464           },
1465           active: {
1466             history: new CircularArray()
1467           }
1468         }
1469       })
1470     }
1471     await dynamicThreadPool.destroy()
1472   })
1473
1474   it('Verify that removeTaskFunction() is working', async () => {
1475     const dynamicThreadPool = new DynamicThreadPool(
1476       Math.floor(numberOfWorkers / 2),
1477       numberOfWorkers,
1478       './tests/worker-files/thread/testWorker.mjs'
1479     )
1480     await waitPoolEvents(dynamicThreadPool, PoolEvents.ready, 1)
1481     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1482       DEFAULT_TASK_NAME,
1483       'test'
1484     ])
1485     await expect(dynamicThreadPool.removeTaskFunction('test')).rejects.toThrow(
1486       new Error('Cannot remove a task function not handled on the pool side')
1487     )
1488     const echoTaskFunction = data => {
1489       return data
1490     }
1491     await dynamicThreadPool.addTaskFunction('echo', echoTaskFunction)
1492     expect(dynamicThreadPool.taskFunctions.size).toBe(1)
1493     expect(dynamicThreadPool.taskFunctions.get('echo')).toStrictEqual(
1494       echoTaskFunction
1495     )
1496     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1497       DEFAULT_TASK_NAME,
1498       'test',
1499       'echo'
1500     ])
1501     await expect(dynamicThreadPool.removeTaskFunction('echo')).resolves.toBe(
1502       true
1503     )
1504     expect(dynamicThreadPool.taskFunctions.size).toBe(0)
1505     expect(dynamicThreadPool.taskFunctions.get('echo')).toBeUndefined()
1506     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1507       DEFAULT_TASK_NAME,
1508       'test'
1509     ])
1510     await dynamicThreadPool.destroy()
1511   })
1512
1513   it('Verify that listTaskFunctionNames() is working', async () => {
1514     const dynamicThreadPool = new DynamicThreadPool(
1515       Math.floor(numberOfWorkers / 2),
1516       numberOfWorkers,
1517       './tests/worker-files/thread/testMultipleTaskFunctionsWorker.mjs'
1518     )
1519     await waitPoolEvents(dynamicThreadPool, PoolEvents.ready, 1)
1520     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1521       DEFAULT_TASK_NAME,
1522       'jsonIntegerSerialization',
1523       'factorial',
1524       'fibonacci'
1525     ])
1526     await dynamicThreadPool.destroy()
1527     const fixedClusterPool = new FixedClusterPool(
1528       numberOfWorkers,
1529       './tests/worker-files/cluster/testMultipleTaskFunctionsWorker.js'
1530     )
1531     await waitPoolEvents(fixedClusterPool, PoolEvents.ready, 1)
1532     expect(fixedClusterPool.listTaskFunctionNames()).toStrictEqual([
1533       DEFAULT_TASK_NAME,
1534       'jsonIntegerSerialization',
1535       'factorial',
1536       'fibonacci'
1537     ])
1538     await fixedClusterPool.destroy()
1539   })
1540
1541   it('Verify that setDefaultTaskFunction() is working', async () => {
1542     const dynamicThreadPool = new DynamicThreadPool(
1543       Math.floor(numberOfWorkers / 2),
1544       numberOfWorkers,
1545       './tests/worker-files/thread/testMultipleTaskFunctionsWorker.mjs'
1546     )
1547     await waitPoolEvents(dynamicThreadPool, PoolEvents.ready, 1)
1548     const workerId = dynamicThreadPool.workerNodes[0].info.id
1549     await expect(dynamicThreadPool.setDefaultTaskFunction(0)).rejects.toThrow(
1550       new Error(
1551         `Task function operation 'default' failed on worker ${workerId} with error: 'TypeError: name parameter is not a string'`
1552       )
1553     )
1554     await expect(
1555       dynamicThreadPool.setDefaultTaskFunction(DEFAULT_TASK_NAME)
1556     ).rejects.toThrow(
1557       new Error(
1558         `Task function operation 'default' failed on worker ${workerId} with error: 'Error: Cannot set the default task function reserved name as the default task function'`
1559       )
1560     )
1561     await expect(
1562       dynamicThreadPool.setDefaultTaskFunction('unknown')
1563     ).rejects.toThrow(
1564       new Error(
1565         `Task function operation 'default' failed on worker ${workerId} with error: 'Error: Cannot set the default task function to a non-existing task function'`
1566       )
1567     )
1568     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1569       DEFAULT_TASK_NAME,
1570       'jsonIntegerSerialization',
1571       'factorial',
1572       'fibonacci'
1573     ])
1574     await expect(
1575       dynamicThreadPool.setDefaultTaskFunction('factorial')
1576     ).resolves.toBe(true)
1577     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1578       DEFAULT_TASK_NAME,
1579       'factorial',
1580       'jsonIntegerSerialization',
1581       'fibonacci'
1582     ])
1583     await expect(
1584       dynamicThreadPool.setDefaultTaskFunction('fibonacci')
1585     ).resolves.toBe(true)
1586     expect(dynamicThreadPool.listTaskFunctionNames()).toStrictEqual([
1587       DEFAULT_TASK_NAME,
1588       'fibonacci',
1589       'jsonIntegerSerialization',
1590       'factorial'
1591     ])
1592     await dynamicThreadPool.destroy()
1593   })
1594
1595   it('Verify that multiple task functions worker is working', async () => {
1596     const pool = new DynamicClusterPool(
1597       Math.floor(numberOfWorkers / 2),
1598       numberOfWorkers,
1599       './tests/worker-files/cluster/testMultipleTaskFunctionsWorker.js'
1600     )
1601     const data = { n: 10 }
1602     const result0 = await pool.execute(data)
1603     expect(result0).toStrictEqual({ ok: 1 })
1604     const result1 = await pool.execute(data, 'jsonIntegerSerialization')
1605     expect(result1).toStrictEqual({ ok: 1 })
1606     const result2 = await pool.execute(data, 'factorial')
1607     expect(result2).toBe(3628800)
1608     const result3 = await pool.execute(data, 'fibonacci')
1609     expect(result3).toBe(55)
1610     expect(pool.info.executingTasks).toBe(0)
1611     expect(pool.info.executedTasks).toBe(4)
1612     for (const workerNode of pool.workerNodes) {
1613       expect(workerNode.info.taskFunctionNames).toStrictEqual([
1614         DEFAULT_TASK_NAME,
1615         'jsonIntegerSerialization',
1616         'factorial',
1617         'fibonacci'
1618       ])
1619       expect(workerNode.taskFunctionsUsage.size).toBe(3)
1620       for (const name of pool.listTaskFunctionNames()) {
1621         expect(workerNode.getTaskFunctionWorkerUsage(name)).toStrictEqual({
1622           tasks: {
1623             executed: expect.any(Number),
1624             executing: 0,
1625             failed: 0,
1626             queued: 0,
1627             sequentiallyStolen: 0,
1628             stolen: 0
1629           },
1630           runTime: {
1631             history: expect.any(CircularArray)
1632           },
1633           waitTime: {
1634             history: expect.any(CircularArray)
1635           },
1636           elu: {
1637             idle: {
1638               history: expect.any(CircularArray)
1639             },
1640             active: {
1641               history: expect.any(CircularArray)
1642             }
1643           }
1644         })
1645         expect(
1646           workerNode.getTaskFunctionWorkerUsage(name).tasks.executed
1647         ).toBeGreaterThan(0)
1648       }
1649       expect(
1650         workerNode.getTaskFunctionWorkerUsage(DEFAULT_TASK_NAME)
1651       ).toStrictEqual(
1652         workerNode.getTaskFunctionWorkerUsage(
1653           workerNode.info.taskFunctionNames[1]
1654         )
1655       )
1656     }
1657     await pool.destroy()
1658   })
1659
1660   it('Verify sendKillMessageToWorker()', async () => {
1661     const pool = new DynamicClusterPool(
1662       Math.floor(numberOfWorkers / 2),
1663       numberOfWorkers,
1664       './tests/worker-files/cluster/testWorker.js'
1665     )
1666     const workerNodeKey = 0
1667     await expect(
1668       pool.sendKillMessageToWorker(workerNodeKey)
1669     ).resolves.toBeUndefined()
1670     await pool.destroy()
1671   })
1672
1673   it('Verify sendTaskFunctionOperationToWorker()', async () => {
1674     const pool = new DynamicClusterPool(
1675       Math.floor(numberOfWorkers / 2),
1676       numberOfWorkers,
1677       './tests/worker-files/cluster/testWorker.js'
1678     )
1679     const workerNodeKey = 0
1680     await expect(
1681       pool.sendTaskFunctionOperationToWorker(workerNodeKey, {
1682         taskFunctionOperation: 'add',
1683         taskFunctionName: 'empty',
1684         taskFunction: (() => {}).toString()
1685       })
1686     ).resolves.toBe(true)
1687     expect(
1688       pool.workerNodes[workerNodeKey].info.taskFunctionNames
1689     ).toStrictEqual([DEFAULT_TASK_NAME, 'test', 'empty'])
1690     await pool.destroy()
1691   })
1692
1693   it('Verify sendTaskFunctionOperationToWorkers()', async () => {
1694     const pool = new DynamicClusterPool(
1695       Math.floor(numberOfWorkers / 2),
1696       numberOfWorkers,
1697       './tests/worker-files/cluster/testWorker.js'
1698     )
1699     await expect(
1700       pool.sendTaskFunctionOperationToWorkers({
1701         taskFunctionOperation: 'add',
1702         taskFunctionName: 'empty',
1703         taskFunction: (() => {}).toString()
1704       })
1705     ).resolves.toBe(true)
1706     for (const workerNode of pool.workerNodes) {
1707       expect(workerNode.info.taskFunctionNames).toStrictEqual([
1708         DEFAULT_TASK_NAME,
1709         'test',
1710         'empty'
1711       ])
1712     }
1713     await pool.destroy()
1714   })
1715 })