CHANGELOG.md

   1 # Changelog
   2
   3 All notable changes to this project will be documented in this file.
   4
   5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
   6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   7
   8 ## [Unreleased]
   9
  10 ### Added
  11
  12 - Bundle typescript types declaration into one file.
  13
  14 ### Changed
  15
  16 - Improve interleaved weighted round robin worker choice strategy implementation.
  17
  18 ## [2.6.37] - 2023-08-28
  19
  20 ### Fixed
  21
  22 - Ensure unused worker usage statistics are deleted at runtime.
  23
  24 ### Changed
  25
  26 - Rename worker choice strategy options `choiceRetries` to `retries`.
  27 - Avoid unnecessary branching in worker choice strategies.
  28
  29 ## [2.6.36] - 2023-08-27
  30
  31 ### Fixed
  32
  33 - Fix pool `execute()` arguments check.
  34
  35 ### Changed
  36
  37 - Make continuous tasks stealing algorithm less aggressive.
  38 - Fine tune tasks stealing algorithm under back pressure.
  39
  40 ## [2.6.35] - 2023-08-25
  41
  42 ### Fixed
  43
  44 - Don't account worker usage statistics for tasks that have failed.
  45 - Fix pool information runtime and wait time median computation.
  46
  47 ### Changed
  48
  49 - Update simple moving average implementation to use a circular buffer.
  50 - Update simple moving median implementation to use a circular buffer.
  51 - Account for stolen tasks in worker usage statistics and pool information.
  52
  53 ### Added
  54
  55 - Continuous tasks stealing algorithm.
  56
  57 ## [2.6.34] - 2023-08-24
  58
  59 ### Fixes
  60
  61 - Avoid cascading tasks stealing under back pressure.
  62
  63 ### Changed
  64
  65 - Add fastpath to queued tasks rescheduling.
  66
  67 ## [2.6.33] - 2023-08-24
  68
  69 ### Fixed
  70
  71 - Fix queued tasks rescheduling.
  72
  73 ### Changed
  74
  75 - Rename tasks queue options `queueMaxSize` to `size`.
  76
  77 ### Added
  78
  79 - Task stealing scheduling algorithm if tasks queueing is enabled.
  80
  81 ## [2.6.32] - 2023-08-23
  82
  83 ### Fixed
  84
  85 - Ensure no task can be executed when the pool is destroyed.
  86
  87 ### Added
  88
  89 - Add `queueMaxSize` option to tasks queue options.
  90 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
  91 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
  92
  93 ## [2.6.31] - 2023-08-20
  94
  95 ### Fixed
  96
  97 - Fix worker choice strategy retries mechanism in some edge cases.
  98
  99 ### Changed
 100
 101 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
 102 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
 103
 104 ## [2.6.30] - 2023-08-19
 105
 106 ### Fixed
 107
 108 - Ensure pool event `backPressure` is emitted.
 109 - Ensure pool event `full` is emitted only once.
 110 - Ensure worker node cannot be instantiated without proper arguments.
 111
 112 ## [2.6.29] - 2023-08-18
 113
 114 ### Fixed
 115
 116 - Fix race condition between ready and task functions worker message handling at startup.
 117 - Fix duplicate task function worker usage statistics computation per task function.
 118 - Update task function worker usage statistics if and only if there's at least two different task functions.
 119 - Fix race condition at task function worker usage executing task computation leading to negative value.
 120
 121 ### Added
 122
 123 - Add back pressure detection on the worker node queue. Event `backPressure` is emitted when all worker node queues are full (worker node queue size >= poolMaxSize^2).
 124 - Use back pressure detection in worker choice strategies.
 125 - Add worker choice strategies retries mechanism if no worker is eligible.
 126
 127 ## [2.6.28] - 2023-08-16
 128
 129 ### Fixed
 130
 131 - Ensure pool workers are properly initialized.
 132
 133 ### Added
 134
 135 - HTTP server pool examples: express-cluster, express-hybrid.
 136
 137 ### Changed
 138
 139 - Remove now useless branching in worker hot code path.
 140
 141 ## [2.6.27] - 2023-08-15
 142
 143 ### Fixed
 144
 145 - Add `KillHandler` type definition to exported types.
 146
 147 ### Added
 148
 149 - Add `destroy` event to pool API.
 150
 151 ## [2.6.26] - 2023-08-15
 152
 153 ### Added
 154
 155 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 156 - Add `listTaskFunctions()` method to pool API.
 157 - SMTP server pool example: nodemailer.
 158
 159 ## [2.6.25] - 2023-08-13
 160
 161 ### Added
 162
 163 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 164 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 165
 166 ## [2.6.24] - 2023-08-12
 167
 168 ### Added
 169
 170 - Add array of transferable objects to the `execute()` method arguments.
 171 - WebSocket server pool examples: ws-worker_threads.
 172
 173 ## [2.6.23] - 2023-08-11
 174
 175 ### Fixed
 176
 177 - Fix pool busyness semantic when tasks queueing is enabled: the pool is busy when the number of executing tasks on each worker has reached the maximum tasks concurrency per worker.
 178
 179 ### Added
 180
 181 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 182 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 183
 184 ## [2.6.22] - 2023-08-10
 185
 186 ### Fixed
 187
 188 - Add missing `types` field to package.json `exports`.
 189
 190 ### Changed
 191
 192 - Structure markdown documentation (PR #811).
 193
 194 ## [2.6.21] - 2023-08-03
 195
 196 ### Changed
 197
 198 - Improve code documentation.
 199 - Code refactoring and cleanup for better maintainability and readability.
 200
 201 ## [2.6.20] - 2023-07-21
 202
 203 ### Fixed
 204
 205 - Fix queued tasks redistribution on error task execution starvation.
 206 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 207
 208 ### Changed
 209
 210 - Drastically reduce lookups by worker in the worker nodes.
 211
 212 ## [2.6.19] - 2023-07-20
 213
 214 ### Added
 215
 216 - Dedicated internal communication channel for worker_threads pools.
 217
 218 ## [2.6.18] - 2023-07-19
 219
 220 ### Changed
 221
 222 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 223
 224 ## [2.6.17] - 2023-07-16
 225
 226 ### Added
 227
 228 - Add `listTaskFunctions()` method to worker API.
 229
 230 ## [2.6.16] - 2023-07-12
 231
 232 ### Fixed
 233
 234 - Fix pool startup detection.
 235 - Fix worker task functions handling.
 236
 237 ## [2.6.15] - 2023-07-11
 238
 239 ### Added
 240
 241 - Take into account worker node readiness in worker choice strategies.
 242
 243 ## [2.6.14] - 2023-07-10
 244
 245 ### Fixed
 246
 247 - Fix task function statistics tracking.
 248
 249 ## [2.6.13] - 2023-07-10
 250
 251 ### Added
 252
 253 - Add per task function statistics tracking.
 254 - Add public methods to manipulate the worker task functions at runtime.
 255
 256 ## [2.6.12] - 2023-07-09
 257
 258 ### Fixed
 259
 260 - Workaround import issue with `node:os` module in node 16.x.x.
 261
 262 ## [2.6.11] - 2023-07-09
 263
 264 ### Fixed
 265
 266 - Fix pool readiness semantic.
 267
 268 ## [2.6.10] - 2023-07-08
 269
 270 ### Fixed
 271
 272 - Ensure workers are not recreated on error at pool startup.
 273
 274 ### Added
 275
 276 - Add `ready` and `strategy` fields to pool information.
 277 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 278 - Add dynamic pool sizing checks.
 279
 280 ## [2.6.9] - 2023-07-07
 281
 282 ### Fixed
 283
 284 - Recreate the right worker type on uncaught exception.
 285
 286 ### Added
 287
 288 - Add minimum and maximum to internal measurement statistics.
 289 - Add `runTime` and `waitTime` to pool information.
 290 - Check worker inactive time only on dynamic worker.
 291
 292 ## [2.6.8] - 2023-07-03
 293
 294 ### Fixed
 295
 296 - Brown paper bag release to fix version handling in pool information.
 297
 298 ## [2.6.7] - 2023-07-03
 299
 300 ### Fixed
 301
 302 - Ensure worker queued tasks at error are reassigned to other pool workers.
 303
 304 ### Added
 305
 306 - Add pool `utilization` ratio to pool information.
 307 - Add `version` to pool information.
 308 - Add worker information to worker nodes.
 309
 310 ## [2.6.6] - 2023-07-01
 311
 312 ### Added
 313
 314 - Add safe helper `availableParallelism()` to help sizing the pool.
 315
 316 ### Fixed
 317
 318 - Ensure message handler is only registered in worker.
 319
 320 ## [2.6.5] - 2023-06-27
 321
 322 ### Known issues
 323
 324 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 325
 326 ### Fixed
 327
 328 - Artificial version bump to 2.6.5 to workaround publication issue.
 329 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 330 - Ensure pool event is emitted before task error promise rejection.
 331 - Fix queued tasks count computation.
 332
 333 ### Removed
 334
 335 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 336
 337 ## [2.6.4] - 2023-06-27
 338
 339 ### Known issues
 340
 341 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 342
 343 ### Fixed
 344
 345 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 346 - Ensure pool event is emitted before task error promise rejection.
 347 - Fix queued tasks count computation.
 348
 349 ### Removed
 350
 351 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 352
 353 ## [2.6.3] - 2023-06-19
 354
 355 ### Fixed
 356
 357 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 358 - Update strategies internals after statistics computation.
 359
 360 ### Changed
 361
 362 - Optimize O(1) queue implementation.
 363
 364 ## [2.6.2] - 2023-06-12
 365
 366 ### Fixed
 367
 368 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 369
 370 ## [2.6.1] - 2023-06-10
 371
 372 ### Added
 373
 374 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 375
 376 ### Fixed
 377
 378 - Fix average statistics computation: ensure failed tasks are not accounted.
 379
 380 ## [2.6.0] - 2023-06-09
 381
 382 ### Added
 383
 384 - Add `LEAST_ELU` worker choice strategy (experimental).
 385 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 386
 387 ### Changed
 388
 389 - Refactor pool worker node usage internals.
 390 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 391 - Breaking change: pool information `info` property object fields have been renamed.
 392
 393 ### Fixed
 394
 395 - Fix wait time accounting.
 396 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 397 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 398
 399 ## [2.5.4] - 2023-06-07
 400
 401 ### Added
 402
 403 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 404
 405 ### Changed
 406
 407 - Compute statistics at the worker level only if needed.
 408 - Add `worker_threads` options to thread pool options.
 409
 410 ### Fixed
 411
 412 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 413
 414 ## [2.5.3] - 2023-06-04
 415
 416 ### Changed
 417
 418 - Refine pool information content.
 419 - Limit pool internals public exposure.
 420
 421 ## [2.5.2] - 2023-06-02
 422
 423 ### Added
 424
 425 - Add `taskError` pool event for task execution error.
 426 - Add pool information `info` property to pool.
 427 - Emit pool information on `busy` and `full` pool events.
 428
 429 ## [2.5.1] - 2023-06-01
 430
 431 ### Added
 432
 433 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 434 - Add `error` pool event for uncaught worker error.
 435
 436 ## [2.5.0] - 2023-05-31
 437
 438 ### Added
 439
 440 - Switch pool event emitter to `EventEmitterAsyncResource`.
 441 - Add tasks wait time accounting in per worker tasks usage.
 442 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 443
 444 ### Changed
 445
 446 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 447
 448 ## [2.4.14] - 2023-05-09
 449
 450 ### Fixed
 451
 452 - Ensure no undefined task runtime can land in the tasks history.
 453 - Fix median computation implementation once again.
 454
 455 ### Added
 456
 457 - Unit tests for median and queue implementations.
 458
 459 ## [2.4.13] - 2023-05-08
 460
 461 ### Fixed
 462
 463 - Fix worker choice strategy options validation.
 464 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 465
 466 ## [2.4.12] - 2023-05-06
 467
 468 ### Added
 469
 470 - Support multiple task functions per worker.
 471 - Add custom worker weights support to worker choice strategies options.
 472
 473 ### Changed
 474
 475 - Use O(1) queue implementation for tasks queueing.
 476
 477 ### Fixed
 478
 479 - Fix median computation implementation.
 480 - Fix fair share worker choice strategy internals update.
 481
 482 ## [2.4.11] - 2023-04-23
 483
 484 ### Changed
 485
 486 - Optimize free worker finding in worker choice strategies.
 487
 488 ## [2.4.10] - 2023-04-15
 489
 490 ### Fixed
 491
 492 - Fix typescript type definition for task function: ensure the input data is optional.
 493 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 494
 495 ## [2.4.9] - 2023-04-15
 496
 497 ### Added
 498
 499 - Add tasks queue enablement runtime setter to pool.
 500 - Add tasks queue options runtime setter to pool.
 501 - Add worker choice strategy options runtime setter to pool.
 502
 503 ### Changed
 504
 505 - Remove the tasks queuing experimental status.
 506
 507 ### Fixed
 508
 509 - Fix task function type definition and validation.
 510 - Fix worker choice strategy options handling.
 511
 512 ## [2.4.8] - 2023-04-12
 513
 514 ### Fixed
 515
 516 - Fix message between main worker and worker type definition for tasks.
 517 - Fix code documentation.
 518
 519 ## [2.4.7] - 2023-04-11
 520
 521 ### Added
 522
 523 - Add worker tasks queue options to pool options.
 524
 525 ### Fixed
 526
 527 - Fix missing documentation.
 528
 529 ## [2.4.6] - 2023-04-10
 530
 531 ### Fixed
 532
 533 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 534 - Properly count worker executing tasks with tasks queueing enabled.
 535
 536 ## [2.4.5] - 2023-04-09
 537
 538 ### Added
 539
 540 - Use monotonic high resolution timer for worker tasks runtime.
 541 - Add worker tasks median runtime to statistics.
 542 - Add worker tasks queue (experimental).
 543
 544 ## [2.4.4] - 2023-04-07
 545
 546 ### Added
 547
 548 - Add `PoolEvents` enumeration and `PoolEvent` type.
 549
 550 ### Fixed
 551
 552 - Destroy worker only on alive check.
 553
 554 ## [2.4.3] - 2023-04-07
 555
 556 ### Fixed
 557
 558 - Fix typedoc generation with inheritance.
 559
 560 ## [2.4.2] - 2023-04-06
 561
 562 ### Added
 563
 564 - Add `full` event to dynamic pool.
 565 - Keep worker choice strategy in memory for conditional reuse.
 566
 567 ### Fixed
 568
 569 - Fix possible negative worker key at worker removal in worker choice strategies.
 570
 571 ## [2.4.1] - 2023-04-05
 572
 573 ### Changed
 574
 575 - Optimize worker choice strategy for dynamic pool.
 576
 577 ### Fixed
 578
 579 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 580
 581 ## [2.4.0] - 2023-04-04
 582
 583 ### Added
 584
 585 - Add `LESS_BUSY` worker choice strategy.
 586
 587 ### Changed
 588
 589 - Optimize worker storage in pool.
 590 - Optimize worker alive status check.
 591 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 592 - Optimize `LESS_USED` worker choice strategy.
 593 - Update benchmarks versus external threads pools.
 594 - Optimize tasks usage statistics requirements for worker choice strategy.
 595
 596 ### Fixed
 597
 598 - Ensure trimmable characters are checked at pool initialization.
 599 - Fix message id integer overflow.
 600 - Fix pool worker removal in worker choice strategy internals.
 601 - Fix package publication with pnpm.
 602
 603 ## [2.4.0-3] - 2023-04-04
 604
 605 ### Added
 606
 607 - Add `LESS_BUSY` worker choice strategy.
 608
 609 ### Changed
 610
 611 - Optimize worker storage in pool.
 612 - Optimize worker alive status check.
 613 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 614 - Optimize `LESS_USED` worker choice strategy.
 615 - Update benchmarks versus external threads pools.
 616
 617 ### Fixed
 618
 619 - Ensure trimmable characters are checked at pool initialization.
 620 - Fix message id integer overflow.
 621 - Fix pool worker removal in worker choice strategy internals.
 622 - Fix package publication with pnpm.
 623
 624 ## [2.4.0-2] - 2023-04-03
 625
 626 ### Added
 627
 628 - Add `LESS_BUSY` worker choice strategy.
 629
 630 ### Changed
 631
 632 - Optimize worker storage in pool.
 633 - Optimize worker alive status check.
 634 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 635 - Optimize `LESS_USED` worker choice strategy.
 636
 637 ### Fixed
 638
 639 - Ensure trimmable characters are checked at pool initialization.
 640 - Fix message id integer overflow.
 641 - Fix pool worker removal in worker choice strategy internals.
 642 - Fix package publication with pnpm.
 643
 644 ## [2.4.0-1] - 2023-04-03
 645
 646 ### Added
 647
 648 - Add `LESS_BUSY` worker choice strategy.
 649
 650 ### Changed
 651
 652 - Optimize worker storage in pool.
 653 - Optimize worker alive status check.
 654 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 655 - Optimize `LESS_USED` worker choice strategy.
 656
 657 ### Fixed
 658
 659 - Ensure trimmable characters are checked at pool initialization.
 660 - Fix message id integer overflow.
 661 - Fix pool worker removal in worker choice strategy internals.
 662
 663 ## [2.4.0-0] - 2023-04-03
 664
 665 ### Added
 666
 667 - Add `LESS_BUSY` worker choice strategy.
 668
 669 ### Changed
 670
 671 - Optimize worker storage in pool.
 672 - Optimize worker alive status check.
 673 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 674 - Optimize `LESS_USED` worker choice strategy.
 675
 676 ### Fixed
 677
 678 - Ensure trimmable characters are checked at pool initialization.
 679 - Fix message id integer overflow.
 680 - Fix pool worker removal in worker choice strategy internals.
 681
 682 ## [2.3.10] - 2023-03-18
 683
 684 ### Fixed
 685
 686 - Fix package.json `exports` syntax for ESM and CommonJS.
 687
 688 ### Changed
 689
 690 - Permit SemVer pre-release publication.
 691
 692 ## [2.3.10-2] - 2023-03-18
 693
 694 ### Fixed
 695
 696 - Fix package.json `exports` syntax for ESM and CommonJS.
 697
 698 ## [2.3.10-1] - 2023-03-18
 699
 700 ### Changed
 701
 702 - Permit SemVer pre-release publication.
 703
 704 ## [2.3.10-0] - 2023-03-18
 705
 706 ### Fixed
 707
 708 - Fix package.json `exports` syntax for ESM and CommonJS.
 709
 710 ## [2.3.9] - 2023-03-18
 711
 712 ### Changed
 713
 714 - Introduce ESM module support along with CommonJS one.
 715
 716 ### Fixed
 717
 718 - Fix brown paper bag bug referencing the same object literal.
 719
 720 ## [2.3.8] - 2023-03-18
 721
 722 ### Changed
 723
 724 - Switch internal benchmarking code to benny.
 725 - Switch to TypeScript 5.x.x.
 726 - Switch rollup bundler plugins to core ones.
 727 - Switch to TSDoc syntax.
 728 - Enforce conventional commits.
 729
 730 ### Fixed
 731
 732 - Fix random integer generator.
 733 - Fix worker choice strategy pool type identification at initialization.
 734
 735 ## [2.3.7] - 2022-10-23
 736
 737 ### Changed
 738
 739 - Switch to open collective FOSS project funding platform.
 740 - Switch to ts-standard linter configuration on TypeScript code.
 741
 742 ### Fixed
 743
 744 - Fixed missing async on pool execute method.
 745 - Fixed typing in TypeScript example.
 746 - Fixed types in unit tests.
 747
 748 ## [2.3.6] - 2022-10-22
 749
 750 ### Changed
 751
 752 - Cleanup pool attributes and methods.
 753 - Refine error types thrown.
 754
 755 ### Fixed
 756
 757 - Fix continuous integration build on windows.
 758 - Fix code coverage reporting by using c8 instead of nyc.
 759
 760 ## [2.3.5] - 2022-10-21
 761
 762 ### Changed
 763
 764 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
 765 - Optimize tasks usage lookup implementation.
 766
 767 ### Fixed
 768
 769 - Fix missed pool event emitter type export.
 770 - Fix typedoc documentation generation.
 771
 772 ## [2.3.4] - 2022-10-17
 773
 774 ### Added
 775
 776 - Fully automate release process with release-it.
 777
 778 ### Changed
 779
 780 - Optimize fair share task scheduling algorithm implementation.
 781 - Update benchmarks versus external pools results with latest version.
 782
 783 ## [2.3.3] - 2022-10-15
 784
 785 ### Added
 786
 787 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
 788
 789 ## [2.3.2] - 2022-10-14
 790
 791 ### Changed
 792
 793 - Optimize fair share worker selection strategy implementation.
 794
 795 ### Fixed
 796
 797 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
 798
 799 ## [2.3.1] - 2022-10-13
 800
 801 ### Added
 802
 803 - Pool worker choice strategies:
 804   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
 805   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
 806
 807 ## [2.2.2] - 2022-10-09
 808
 809 ### Fixed
 810
 811 - Fixed `README.md` file.
 812
 813 ## [2.2.1] - 2022-10-08
 814
 815 ### Added
 816
 817 - Dynamic worker choice strategy change at runtime.
 818
 819 ## [2.2.0] - 2022-01-05
 820
 821 ### Breaking Changes
 822
 823 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
 824
 825 ## [2.1.0] - 2021-08-29
 826
 827 ### Added
 828
 829 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
 830
 831 ### Breaking Changes
 832
 833 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
 834 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
 835 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
 836 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
 837
 838 ## [2.0.2] - 2021-05-12
 839
 840 ### Bug fixes
 841
 842 - Fix `busy` event emission on fixed pool type
 843
 844 ## [2.0.1] - 2021-03-16
 845
 846 ### Bug fixes
 847
 848 - Check if pool options are properly set.
 849 - `busy` event is emitted on all pool types.
 850
 851 ## [2.0.0] - 2021-03-01
 852
 853 ### Bug fixes
 854
 855 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
 856
 857 ### Breaking Changes
 858
 859 - `FullPool` event is now renamed to `busy`.
 860 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
 861   _Find more details on our JSDoc._
 862
 863 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
 864
 865 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
 866
 867 ### Pool options types declaration merge
 868
 869 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
 870
 871 #### New `export` strategy
 872
 873 ```js
 874 // Before
 875 const DynamicThreadPool = require('poolifier/lib/dynamic')
 876 // After
 877 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
 878 ```
 879
 880 But you should always prefer just using
 881
 882 ```js
 883 const { DynamicThreadPool } = require('poolifier')
 884 ```
 885
 886 #### New type definitions for input data and response
 887
 888 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
 889 _This is not a limitation by poolifier but Node.js._
 890
 891 #### Public property replacements
 892
 893 `numWorkers` property is now `numberOfWorkers`
 894
 895 #### Internal (protected) properties and methods renaming
 896
 897 These properties are not intended for end users
 898
 899 - `id` => `nextMessageId`
 900
 901 These methods are not intended for end users
 902
 903 - `_chooseWorker` => `chooseWorker`
 904 - `_newWorker` => `createWorker`
 905 - `_execute` => `internalExecute`
 906 - `_chooseWorker` => `chooseWorker`
 907 - `_checkAlive` => `checkAlive`
 908 - `_run` => `run`
 909 - `_runAsync` => `runAsync`
 910
 911 ## [1.1.0] - 2020-05-21
 912
 913 ### Added
 914
 915 - ThreadWorker support async functions as option
 916 - Various external library patches
 917
 918 ## [1.0.0] - 2020-01-24
 919
 920 ### Added
 921
 922 - FixedThreadPool implementation
 923 - DynamicThreadPool implementation
 924 - WorkerThread implementation to improve developer experience