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 ## [3.0.2] - 2023-10-17
  11
  12 ### Fixed
  13
  14 - Fix race condition at dynamic worker node task assignment and scheduled removal. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468) and [#1496](https://github.com/poolifier/poolifier/issues/1496)
  15
  16 ## [3.0.1] - 2023-10-16
  17
  18 ### Fixed
  19
  20 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
  21
  22 ### Changed
  23
  24 - Switch the worker node eventing code to `EventTarget` API .
  25
  26 ## [3.0.0] - 2023-10-08
  27
  28 ### Changed
  29
  30 - Remove Node.js 16.x.x (EOL) support.
  31
  32 ## [2.7.5] - 2023-10-03
  33
  34 ### Changed
  35
  36 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
  37
  38 ## [2.7.4] - 2023-09-25
  39
  40 ### Fixed
  41
  42 - Fix source maps (bundler issue).
  43
  44 ## [2.7.3] - 2023-09-24
  45
  46 ### Changed
  47
  48 - Convert pool event emitter to event emitter async resource.
  49
  50 ## [2.7.2] - 2023-09-23
  51
  52 ### Changed
  53
  54 - Add source maps to npm package to ease debugging.
  55
  56 ### Added
  57
  58 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
  59
  60 ## [2.7.1] - 2023-09-20
  61
  62 ### Fixed
  63
  64 - Ensure worker message listener used one time are removed after usage.
  65
  66 ## [2.7.0] - 2023-09-19
  67
  68 ### Fixed
  69
  70 - Fix task stealing related tasks queue options handling at runtime.
  71
  72 ### Changed
  73
  74 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
  75
  76 ### Added
  77
  78 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
  79 - Stricter worker constructor arguments validation.
  80
  81 ## [2.6.45] - 2023-09-17
  82
  83 ### Changed
  84
  85 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
  86
  87 ### Added
  88
  89 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
  90 - Add `start()` method to pool API to start the minimum number of workers.
  91 - Add `taskStealing` and `tasksStealingOnPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
  92 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
  93
  94 ## [2.6.44] - 2023-09-08
  95
  96 ### Fixed
  97
  98 - Use a dedicated PAT to publish on GitHub packages registry.
  99
 100 ### Added
 101
 102 - Publish on GitHub packages registry on release.
 103
 104 ### Changed
 105
 106 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 107
 108 ## [2.6.43] - 2023-09-08
 109
 110 ### Added
 111
 112 - Publish on GitHub packages registry on release.
 113
 114 ### Changed
 115
 116 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
 117
 118 ## [2.6.42] - 2023-09-06
 119
 120 ### Changed
 121
 122 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
 123
 124 ## [2.6.41] - 2023-09-03
 125
 126 ### Changed
 127
 128 - Optimize worker choice strategies implementation.
 129
 130 ## [2.6.40] - 2023-09-01
 131
 132 ### Fixed
 133
 134 - Do not pre-choose in WRR worker choice strategy to avoid bias.
 135 - Avoid array out of bound in worker choice strategies after worker node removal.
 136
 137 ## [2.6.39] - 2023-08-30
 138
 139 ### Fixed
 140
 141 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
 142
 143 ## [2.6.38] - 2023-08-30
 144
 145 ### Added
 146
 147 - Bundle typescript types declaration into one file.
 148
 149 ### Changed
 150
 151 - Improve interleaved weighted round robin worker choice strategy implementation.
 152
 153 ## [2.6.37] - 2023-08-28
 154
 155 ### Fixed
 156
 157 - Ensure unused worker usage statistics are deleted at runtime.
 158
 159 ### Changed
 160
 161 - Rename worker choice strategy options `choiceRetries` to `retries`.
 162 - Avoid unnecessary branching in worker choice strategies.
 163
 164 ## [2.6.36] - 2023-08-27
 165
 166 ### Fixed
 167
 168 - Fix pool `execute()` arguments check.
 169
 170 ### Changed
 171
 172 - Make continuous tasks stealing algorithm less aggressive.
 173 - Fine tune tasks stealing algorithm under back pressure.
 174
 175 ## [2.6.35] - 2023-08-25
 176
 177 ### Fixed
 178
 179 - Don't account worker usage statistics for tasks that have failed.
 180 - Fix pool information runtime and wait time median computation.
 181
 182 ### Changed
 183
 184 - Update simple moving average implementation to use a circular buffer.
 185 - Update simple moving median implementation to use a circular buffer.
 186 - Account for stolen tasks in worker usage statistics and pool information.
 187
 188 ### Added
 189
 190 - Continuous tasks stealing algorithm.
 191
 192 ## [2.6.34] - 2023-08-24
 193
 194 ### Fixes
 195
 196 - Avoid cascading tasks stealing under back pressure.
 197
 198 ### Changed
 199
 200 - Add fastpath to queued tasks rescheduling.
 201
 202 ## [2.6.33] - 2023-08-24
 203
 204 ### Fixed
 205
 206 - Fix queued tasks rescheduling.
 207
 208 ### Changed
 209
 210 - Rename tasks queue options `queueMaxSize` to `size`.
 211
 212 ### Added
 213
 214 - Task stealing scheduling algorithm if tasks queueing is enabled.
 215
 216 ## [2.6.32] - 2023-08-23
 217
 218 ### Fixed
 219
 220 - Ensure no task can be executed when the pool is destroyed.
 221
 222 ### Added
 223
 224 - Add `queueMaxSize` option to tasks queue options.
 225 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
 226 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
 227
 228 ## [2.6.31] - 2023-08-20
 229
 230 ### Fixed
 231
 232 - Fix worker choice strategy retries mechanism in some edge cases.
 233
 234 ### Changed
 235
 236 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
 237 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
 238
 239 ## [2.6.30] - 2023-08-19
 240
 241 ### Fixed
 242
 243 - Ensure pool event `backPressure` is emitted.
 244 - Ensure pool event `full` is emitted only once.
 245 - Ensure worker node cannot be instantiated without proper arguments.
 246
 247 ## [2.6.29] - 2023-08-18
 248
 249 ### Fixed
 250
 251 - Fix race condition between ready and task functions worker message handling at startup.
 252 - Fix duplicate task function worker usage statistics computation per task function.
 253 - Update task function worker usage statistics if and only if there's at least two different task functions.
 254 - Fix race condition at task function worker usage executing task computation leading to negative value.
 255
 256 ### Added
 257
 258 - 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).
 259 - Use back pressure detection in worker choice strategies.
 260 - Add worker choice strategies retries mechanism if no worker is eligible.
 261
 262 ## [2.6.28] - 2023-08-16
 263
 264 ### Fixed
 265
 266 - Ensure pool workers are properly initialized.
 267
 268 ### Added
 269
 270 - HTTP server pool examples: express-cluster, express-hybrid.
 271
 272 ### Changed
 273
 274 - Remove now useless branching in worker hot code path.
 275
 276 ## [2.6.27] - 2023-08-15
 277
 278 ### Fixed
 279
 280 - Add `KillHandler` type definition to exported types.
 281
 282 ### Added
 283
 284 - Add `destroy` event to pool API.
 285
 286 ## [2.6.26] - 2023-08-15
 287
 288 ### Added
 289
 290 - Add kill handler to worker options allowing to execute custom code when worker is killed.
 291 - Add `listTaskFunctions()` method to pool API.
 292 - SMTP client pool example: nodemailer.
 293
 294 ## [2.6.25] - 2023-08-13
 295
 296 ### Added
 297
 298 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
 299 - WebSocket server pool examples: ws-cluster, ws-hybrid.
 300
 301 ## [2.6.24] - 2023-08-12
 302
 303 ### Added
 304
 305 - Add array of transferable objects to the `execute()` method arguments.
 306 - WebSocket server pool examples: ws-worker_threads.
 307
 308 ## [2.6.23] - 2023-08-11
 309
 310 ### Fixed
 311
 312 - 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.
 313
 314 ### Added
 315
 316 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
 317 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
 318
 319 ## [2.6.22] - 2023-08-10
 320
 321 ### Fixed
 322
 323 - Add missing `types` field to package.json `exports`.
 324
 325 ### Changed
 326
 327 - Structure markdown documentation (PR #811).
 328
 329 ## [2.6.21] - 2023-08-03
 330
 331 ### Changed
 332
 333 - Improve code documentation.
 334 - Code refactoring and cleanup for better maintainability and readability.
 335
 336 ## [2.6.20] - 2023-07-21
 337
 338 ### Fixed
 339
 340 - Fix queued tasks redistribution on error task execution starvation.
 341 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
 342
 343 ### Changed
 344
 345 - Drastically reduce lookups by worker in the worker nodes.
 346
 347 ## [2.6.19] - 2023-07-20
 348
 349 ### Added
 350
 351 - Dedicated internal communication channel for worker_threads pools.
 352
 353 ## [2.6.18] - 2023-07-19
 354
 355 ### Changed
 356
 357 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
 358
 359 ## [2.6.17] - 2023-07-16
 360
 361 ### Added
 362
 363 - Add `listTaskFunctions()` method to worker API.
 364
 365 ## [2.6.16] - 2023-07-12
 366
 367 ### Fixed
 368
 369 - Fix pool startup detection.
 370 - Fix worker task functions handling.
 371
 372 ## [2.6.15] - 2023-07-11
 373
 374 ### Added
 375
 376 - Take into account worker node readiness in worker choice strategies.
 377
 378 ## [2.6.14] - 2023-07-10
 379
 380 ### Fixed
 381
 382 - Fix task function statistics tracking.
 383
 384 ## [2.6.13] - 2023-07-10
 385
 386 ### Added
 387
 388 - Add per task function statistics tracking.
 389 - Add public methods to manipulate the worker task functions at runtime.
 390
 391 ## [2.6.12] - 2023-07-09
 392
 393 ### Fixed
 394
 395 - Workaround import issue with `node:os` module in node 16.x.x.
 396
 397 ## [2.6.11] - 2023-07-09
 398
 399 ### Fixed
 400
 401 - Fix pool readiness semantic.
 402
 403 ## [2.6.10] - 2023-07-08
 404
 405 ### Fixed
 406
 407 - Ensure workers are not recreated on error at pool startup.
 408
 409 ### Added
 410
 411 - Add `ready` and `strategy` fields to pool information.
 412 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
 413 - Add dynamic pool sizing checks.
 414
 415 ## [2.6.9] - 2023-07-07
 416
 417 ### Fixed
 418
 419 - Recreate the right worker type on uncaught exception.
 420
 421 ### Added
 422
 423 - Add minimum and maximum to internal measurement statistics.
 424 - Add `runTime` and `waitTime` to pool information.
 425 - Check worker inactive time only on dynamic worker.
 426
 427 ## [2.6.8] - 2023-07-03
 428
 429 ### Fixed
 430
 431 - Brown paper bag release to fix version handling in pool information.
 432
 433 ## [2.6.7] - 2023-07-03
 434
 435 ### Fixed
 436
 437 - Ensure worker queued tasks at error are reassigned to other pool workers.
 438
 439 ### Added
 440
 441 - Add pool `utilization` ratio to pool information.
 442 - Add `version` to pool information.
 443 - Add worker information to worker nodes.
 444
 445 ## [2.6.6] - 2023-07-01
 446
 447 ### Added
 448
 449 - Add safe helper `availableParallelism()` to help sizing the pool.
 450
 451 ### Fixed
 452
 453 - Ensure message handler is only registered in worker.
 454
 455 ## [2.6.5] - 2023-06-27
 456
 457 ### Known issues
 458
 459 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 460
 461 ### Fixed
 462
 463 - Artificial version bump to 2.6.5 to workaround publication issue.
 464 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 465 - Ensure pool event is emitted before task error promise rejection.
 466 - Fix queued tasks count computation.
 467
 468 ### Removed
 469
 470 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 471
 472 ## [2.6.4] - 2023-06-27
 473
 474 ### Known issues
 475
 476 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
 477
 478 ### Fixed
 479
 480 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
 481 - Ensure pool event is emitted before task error promise rejection.
 482 - Fix queued tasks count computation.
 483
 484 ### Removed
 485
 486 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
 487
 488 ## [2.6.3] - 2023-06-19
 489
 490 ### Fixed
 491
 492 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
 493 - Update strategies internals after statistics computation.
 494
 495 ### Changed
 496
 497 - Optimize O(1) queue implementation.
 498
 499 ## [2.6.2] - 2023-06-12
 500
 501 ### Fixed
 502
 503 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
 504
 505 ## [2.6.1] - 2023-06-10
 506
 507 ### Added
 508
 509 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
 510
 511 ### Fixed
 512
 513 - Fix average statistics computation: ensure failed tasks are not accounted.
 514
 515 ## [2.6.0] - 2023-06-09
 516
 517 ### Added
 518
 519 - Add `LEAST_ELU` worker choice strategy (experimental).
 520 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
 521
 522 ### Changed
 523
 524 - Refactor pool worker node usage internals.
 525 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
 526 - Breaking change: pool information `info` property object fields have been renamed.
 527
 528 ### Fixed
 529
 530 - Fix wait time accounting.
 531 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
 532 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
 533
 534 ## [2.5.4] - 2023-06-07
 535
 536 ### Added
 537
 538 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
 539
 540 ### Changed
 541
 542 - Compute statistics at the worker level only if needed.
 543 - Add `worker_threads` options to thread pool options.
 544
 545 ### Fixed
 546
 547 - Make the `LEAST_BUSY` strategy only relies on task runtime.
 548
 549 ## [2.5.3] - 2023-06-04
 550
 551 ### Changed
 552
 553 - Refine pool information content.
 554 - Limit pool internals public exposure.
 555
 556 ## [2.5.2] - 2023-06-02
 557
 558 ### Added
 559
 560 - Add `taskError` pool event for task execution error.
 561 - Add pool information `info` property to pool.
 562 - Emit pool information on `busy` and `full` pool events.
 563
 564 ## [2.5.1] - 2023-06-01
 565
 566 ### Added
 567
 568 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
 569 - Add `error` pool event for uncaught worker error.
 570
 571 ## [2.5.0] - 2023-05-31
 572
 573 ### Added
 574
 575 - Switch pool event emitter to `EventEmitterAsyncResource`.
 576 - Add tasks wait time accounting in per worker tasks usage.
 577 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
 578
 579 ### Changed
 580
 581 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
 582
 583 ## [2.4.14] - 2023-05-09
 584
 585 ### Fixed
 586
 587 - Ensure no undefined task runtime can land in the tasks history.
 588 - Fix median computation implementation once again.
 589
 590 ### Added
 591
 592 - Unit tests for median and queue implementations.
 593
 594 ## [2.4.13] - 2023-05-08
 595
 596 ### Fixed
 597
 598 - Fix worker choice strategy options validation.
 599 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
 600
 601 ## [2.4.12] - 2023-05-06
 602
 603 ### Added
 604
 605 - Support multiple task functions per worker.
 606 - Add custom worker weights support to worker choice strategies options.
 607
 608 ### Changed
 609
 610 - Use O(1) queue implementation for tasks queueing.
 611
 612 ### Fixed
 613
 614 - Fix median computation implementation.
 615 - Fix fair share worker choice strategy internals update.
 616
 617 ## [2.4.11] - 2023-04-23
 618
 619 ### Changed
 620
 621 - Optimize free worker finding in worker choice strategies.
 622
 623 ## [2.4.10] - 2023-04-15
 624
 625 ### Fixed
 626
 627 - Fix typescript type definition for task function: ensure the input data is optional.
 628 - Fix typescript type definition for pool execute(): ensure the input data is optional.
 629
 630 ## [2.4.9] - 2023-04-15
 631
 632 ### Added
 633
 634 - Add tasks queue enablement runtime setter to pool.
 635 - Add tasks queue options runtime setter to pool.
 636 - Add worker choice strategy options runtime setter to pool.
 637
 638 ### Changed
 639
 640 - Remove the tasks queuing experimental status.
 641
 642 ### Fixed
 643
 644 - Fix task function type definition and validation.
 645 - Fix worker choice strategy options handling.
 646
 647 ## [2.4.8] - 2023-04-12
 648
 649 ### Fixed
 650
 651 - Fix message between main worker and worker type definition for tasks.
 652 - Fix code documentation.
 653
 654 ## [2.4.7] - 2023-04-11
 655
 656 ### Added
 657
 658 - Add worker tasks queue options to pool options.
 659
 660 ### Fixed
 661
 662 - Fix missing documentation.
 663
 664 ## [2.4.6] - 2023-04-10
 665
 666 ### Fixed
 667
 668 - Ensure one task at a time is executed per worker with tasks queueing enabled.
 669 - Properly count worker executing tasks with tasks queueing enabled.
 670
 671 ## [2.4.5] - 2023-04-09
 672
 673 ### Added
 674
 675 - Use monotonic high resolution timer for worker tasks runtime.
 676 - Add worker tasks median runtime to statistics.
 677 - Add worker tasks queue (experimental).
 678
 679 ## [2.4.4] - 2023-04-07
 680
 681 ### Added
 682
 683 - Add `PoolEvents` enumeration and `PoolEvent` type.
 684
 685 ### Fixed
 686
 687 - Destroy worker only on alive check.
 688
 689 ## [2.4.3] - 2023-04-07
 690
 691 ### Fixed
 692
 693 - Fix typedoc generation with inheritance.
 694
 695 ## [2.4.2] - 2023-04-06
 696
 697 ### Added
 698
 699 - Add `full` event to dynamic pool.
 700 - Keep worker choice strategy in memory for conditional reuse.
 701
 702 ### Fixed
 703
 704 - Fix possible negative worker key at worker removal in worker choice strategies.
 705
 706 ## [2.4.1] - 2023-04-05
 707
 708 ### Changed
 709
 710 - Optimize worker choice strategy for dynamic pool.
 711
 712 ### Fixed
 713
 714 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
 715
 716 ## [2.4.0] - 2023-04-04
 717
 718 ### Added
 719
 720 - Add `LESS_BUSY` worker choice strategy.
 721
 722 ### Changed
 723
 724 - Optimize worker storage in pool.
 725 - Optimize worker alive status check.
 726 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 727 - Optimize `LESS_USED` worker choice strategy.
 728 - Update benchmark versus external threads pools.
 729 - Optimize tasks usage statistics requirements for worker choice strategy.
 730
 731 ### Fixed
 732
 733 - Ensure trimmable characters are checked at pool initialization.
 734 - Fix message id integer overflow.
 735 - Fix pool worker removal in worker choice strategy internals.
 736 - Fix package publication with pnpm.
 737
 738 ## [2.4.0-3] - 2023-04-04
 739
 740 ### Added
 741
 742 - Add `LESS_BUSY` worker choice strategy.
 743
 744 ### Changed
 745
 746 - Optimize worker storage in pool.
 747 - Optimize worker alive status check.
 748 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 749 - Optimize `LESS_USED` worker choice strategy.
 750 - Update benchmark versus external threads pools.
 751
 752 ### Fixed
 753
 754 - Ensure trimmable characters are checked at pool initialization.
 755 - Fix message id integer overflow.
 756 - Fix pool worker removal in worker choice strategy internals.
 757 - Fix package publication with pnpm.
 758
 759 ## [2.4.0-2] - 2023-04-03
 760
 761 ### Added
 762
 763 - Add `LESS_BUSY` worker choice strategy.
 764
 765 ### Changed
 766
 767 - Optimize worker storage in pool.
 768 - Optimize worker alive status check.
 769 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 770 - Optimize `LESS_USED` worker choice strategy.
 771
 772 ### Fixed
 773
 774 - Ensure trimmable characters are checked at pool initialization.
 775 - Fix message id integer overflow.
 776 - Fix pool worker removal in worker choice strategy internals.
 777 - Fix package publication with pnpm.
 778
 779 ## [2.4.0-1] - 2023-04-03
 780
 781 ### Added
 782
 783 - Add `LESS_BUSY` worker choice strategy.
 784
 785 ### Changed
 786
 787 - Optimize worker storage in pool.
 788 - Optimize worker alive status check.
 789 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 790 - Optimize `LESS_USED` worker choice strategy.
 791
 792 ### Fixed
 793
 794 - Ensure trimmable characters are checked at pool initialization.
 795 - Fix message id integer overflow.
 796 - Fix pool worker removal in worker choice strategy internals.
 797
 798 ## [2.4.0-0] - 2023-04-03
 799
 800 ### Added
 801
 802 - Add `LESS_BUSY` worker choice strategy.
 803
 804 ### Changed
 805
 806 - Optimize worker storage in pool.
 807 - Optimize worker alive status check.
 808 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
 809 - Optimize `LESS_USED` worker choice strategy.
 810
 811 ### Fixed
 812
 813 - Ensure trimmable characters are checked at pool initialization.
 814 - Fix message id integer overflow.
 815 - Fix pool worker removal in worker choice strategy internals.
 816
 817 ## [2.3.10] - 2023-03-18
 818
 819 ### Fixed
 820
 821 - Fix package.json `exports` syntax for ESM and CommonJS.
 822
 823 ### Changed
 824
 825 - Permit SemVer pre-release publication.
 826
 827 ## [2.3.10-2] - 2023-03-18
 828
 829 ### Fixed
 830
 831 - Fix package.json `exports` syntax for ESM and CommonJS.
 832
 833 ## [2.3.10-1] - 2023-03-18
 834
 835 ### Changed
 836
 837 - Permit SemVer pre-release publication.
 838
 839 ## [2.3.10-0] - 2023-03-18
 840
 841 ### Fixed
 842
 843 - Fix package.json `exports` syntax for ESM and CommonJS.
 844
 845 ## [2.3.9] - 2023-03-18
 846
 847 ### Changed
 848
 849 - Introduce ESM module support along with CommonJS one.
 850
 851 ### Fixed
 852
 853 - Fix brown paper bag bug referencing the same object literal.
 854
 855 ## [2.3.8] - 2023-03-18
 856
 857 ### Changed
 858
 859 - Switch internal benchmarking code to benny.
 860 - Switch to TypeScript 5.x.x.
 861 - Switch rollup bundler plugins to core ones.
 862 - Switch to TSDoc syntax.
 863 - Enforce conventional commits.
 864
 865 ### Fixed
 866
 867 - Fix random integer generator.
 868 - Fix worker choice strategy pool type identification at initialization.
 869
 870 ## [2.3.7] - 2022-10-23
 871
 872 ### Changed
 873
 874 - Switch to open collective FOSS project funding platform.
 875 - Switch to ts-standard linter configuration on TypeScript code.
 876
 877 ### Fixed
 878
 879 - Fixed missing async on pool execute method.
 880 - Fixed typing in TypeScript example.
 881 - Fixed types in unit tests.
 882
 883 ## [2.3.6] - 2022-10-22
 884
 885 ### Changed
 886
 887 - Cleanup pool attributes and methods.
 888 - Refine error types thrown.
 889
 890 ### Fixed
 891
 892 - Fix continuous integration build on windows.
 893 - Fix code coverage reporting by using c8 instead of nyc.
 894
 895 ## [2.3.5] - 2022-10-21
 896
 897 ### Changed
 898
 899 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
 900 - Optimize tasks usage lookup implementation.
 901
 902 ### Fixed
 903
 904 - Fix missed pool event emitter type export.
 905 - Fix typedoc documentation generation.
 906
 907 ## [2.3.4] - 2022-10-17
 908
 909 ### Added
 910
 911 - Fully automate release process with release-it.
 912
 913 ### Changed
 914
 915 - Optimize fair share task scheduling algorithm implementation.
 916 - Update benchmark versus external pools results with latest version.
 917
 918 ## [2.3.3] - 2022-10-15
 919
 920 ### Added
 921
 922 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
 923
 924 ## [2.3.2] - 2022-10-14
 925
 926 ### Changed
 927
 928 - Optimize fair share worker selection strategy implementation.
 929
 930 ### Fixed
 931
 932 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
 933
 934 ## [2.3.1] - 2022-10-13
 935
 936 ### Added
 937
 938 - Pool worker choice strategies:
 939   - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
 940   - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
 941
 942 ## [2.2.2] - 2022-10-09
 943
 944 ### Fixed
 945
 946 - Fixed `README.md` file.
 947
 948 ## [2.2.1] - 2022-10-08
 949
 950 ### Added
 951
 952 - Dynamic worker choice strategy change at runtime.
 953
 954 ## [2.2.0] - 2022-01-05
 955
 956 ### Breaking Changes
 957
 958 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
 959
 960 ## [2.1.0] - 2021-08-29
 961
 962 ### Added
 963
 964 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
 965
 966 ### Breaking Changes
 967
 968 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
 969 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
 970 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
 971 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
 972
 973 ## [2.0.2] - 2021-05-12
 974
 975 ### Bug fixes
 976
 977 - Fix `busy` event emission on fixed pool type
 978
 979 ## [2.0.1] - 2021-03-16
 980
 981 ### Bug fixes
 982
 983 - Check if pool options are properly set.
 984 - `busy` event is emitted on all pool types.
 985
 986 ## [2.0.0] - 2021-03-01
 987
 988 ### Bug fixes
 989
 990 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
 991
 992 ### Breaking Changes
 993
 994 - `FullPool` event is now renamed to `busy`.
 995 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
 996   _Find more details on our JSDoc._
 997
 998 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
 999
1000 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1001
1002 ### Pool options types declaration merge
1003
1004 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1005
1006 #### New `export` strategy
1007
1008 ```js
1009 // Before
1010 const DynamicThreadPool = require('poolifier/lib/dynamic')
1011 // After
1012 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1013 ```
1014
1015 But you should always prefer just using
1016
1017 ```js
1018 const { DynamicThreadPool } = require('poolifier')
1019 ```
1020
1021 #### New type definitions for input data and response
1022
1023 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1024 _This is not a limitation by poolifier but Node.js._
1025
1026 #### Public property replacements
1027
1028 `numWorkers` property is now `numberOfWorkers`
1029
1030 #### Internal (protected) properties and methods renaming
1031
1032 These properties are not intended for end users
1033
1034 - `id` => `nextMessageId`
1035
1036 These methods are not intended for end users
1037
1038 - `_chooseWorker` => `chooseWorker`
1039 - `_newWorker` => `createWorker`
1040 - `_execute` => `internalExecute`
1041 - `_chooseWorker` => `chooseWorker`
1042 - `_checkAlive` => `checkAlive`
1043 - `_run` => `run`
1044 - `_runAsync` => `runAsync`
1045
1046 ## [1.1.0] - 2020-05-21
1047
1048 ### Added
1049
1050 - ThreadWorker support async functions as option
1051 - Various external library patches
1052
1053 ## [1.0.0] - 2020-01-24
1054
1055 ### Added
1056
1057 - FixedThreadPool implementation
1058 - DynamicThreadPool implementation
1059 - WorkerThread implementation to improve developer experience