3 All notable changes to this project will be documented in this file.
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).
10 ## [4.0.6] - 2024-05-10
14 - Fix pools' `addTaskFunction()` type definition.
16 ## [4.0.5] - 2024-05-09
20 - Avoid queued tasks redistribution on the errored worker node.
22 ## [4.0.4] - 2024-05-08
26 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
28 ## [4.0.3] - 2024-05-08
32 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
34 ## [4.0.2] - 2024-05-06
38 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
40 ## [4.0.1] - 2024-05-02
44 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
45 - Account for tasks wait time in task execution time computation in worker choice strategies to avoid biased decisions under load with several prioritized task functions and tasks queue enabled.
47 ## [4.0.0] - 2024-04-30
51 - Support per task function(s) priority and worker choice strategy definition via a task function object: `{ taskFunction: (data?: Data) => Response | Promise<Response>, priority?: number, strategy?: WorkerChoiceStrategy }`.
52 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
53 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
54 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
58 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
60 ## [3.1.30] - 2024-04-22
64 - Fix `transferList` argument type definition.
66 ## [3.1.29] - 2024-04-02
70 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
72 ## [3.1.28] - 2024-04-01
76 - Ensure the minimum number of workers on a started pool is guaranteed.
78 ## [3.1.27] - 2024-03-27
82 - Fix publishing on JSR, take 4.
84 ## [3.1.26] - 2024-03-27
88 - Fix publishing on JSR, take 3.
90 ## [3.1.25] - 2024-03-27
94 - Fix publishing on JSR, take 2.
96 ## [3.1.24] - 2024-03-27
100 - Fix publishing on JSR.
102 ## [3.1.23] - 2024-03-27
108 ## [3.1.22] - 2024-03-15
112 - Fix pool event emitter registered callbacks removal at `destroy()`.
114 ## [3.1.21] - 2024-02-22
118 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
120 ## [3.1.20] - 2024-02-11
124 - Ensure `worker_threads` workers are unreferenced at termination.
126 ## [3.1.19] - 2024-01-16
130 - Fix possible null exception at task finishing handling.
134 - Optimize Deque implementation to improve tasks queueing performance.
136 ## [3.1.18] - 2024-01-06
140 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
142 ## [3.1.17] - 2024-01-05
146 - Improve performance by clean up unneeded condition checks on hot code paths.
148 ## [3.1.16] - 2024-01-03
152 - Add missing type to TS type definitions.
154 ## [3.1.15] - 2024-01-02
158 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
160 ## [3.1.15-0] - 2024-01-02
164 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
166 ## [3.1.14] - 2024-01-01
170 - Properly handle dynamic pool with zero minimum size.
172 ## [3.1.13] - 2023-12-30
176 - Reduce branching in several hot code paths.
177 - Use faster object cloning implementation.
179 ## [3.1.12] - 2023-12-27
183 - Fix tasks redistribution triggers at pool destroying.
187 - Switch TypeScript module resolution to Node16.
189 ## [3.1.12-0] - 2023-12-27
193 - Fix tasks redistribution triggers at pool destroying.
195 ## [3.1.11] - 2023-12-24
199 - Avoid worker node cross tasks stealing.
200 - Ensure only half the pool worker nodes can steal tasks.
202 ## [3.1.10] - 2023-12-23
206 - Avoid useless branching on pool type.
208 ## [3.1.9] - 2023-12-22
212 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
214 ## [3.1.8] - 2023-12-21
218 - Fix default worker weight computation.
219 - Fix possible null exception at pool destroying.
221 ## [3.1.7] - 2023-12-20
225 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
227 ## [3.1.6] - 2023-12-18
231 - Fix pool destroying with tasks queuing enabled.
233 ## [3.1.5] - 2023-12-18
237 - Add queued tasks end timeout support to worker node termination.
239 ## [3.1.4] - 2023-12-18
243 - Make more robust the fix for possible null exception at handling task execution response.
245 ## [3.1.3] - 2023-12-17
249 - Fix possible null exception at handling task execution response.
251 ## [3.1.2] - 2023-12-17
255 - Wait for queued tasks to end at worker node termination.
257 ## [3.1.1] - 2023-12-16
261 - Fix pool options TS type definition.
263 ## [3.1.0] - 2023-12-16
267 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
269 ## [3.0.14] - 2023-12-13
273 - Fix possible null exception with worker_threads pools.
275 ## [3.0.13] - 2023-12-12
279 - Ensure worker choice strategy wait for worker nodes readiness.
283 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
285 ## [3.0.12] - 2023-12-12
289 - Add infinite retries support in worker choice strategy.
291 ## [3.0.11] - 2023-12-11
295 - Ensure pool asynchronous resource properly track tasks execution.
297 ## [3.0.10] - 2023-12-08
301 - Add a fastpath when tasks stealing or redistribution is impossible.
303 ## [3.0.9] - 2023-11-26
307 - Remove all pool events listener at pool destroying.
308 - Remove all worker node events listener at worker node destroying.
309 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
311 ## [3.0.8] - 2023-11-25
315 - Ensure continuous tasks stealing on idle start at worker node idling.
317 ## [3.0.7] - 2023-11-24
321 - Make continuous tasks stealing start at worker node idling.
323 ## [3.0.6] - 2023-11-24
327 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
328 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
330 ## [3.0.5] - 2023-10-27
334 - Ensure pool `ready` event can be emitted only once.
336 ## [3.0.4] - 2023-10-20
340 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
341 - Use builtin retry mechanism in worker choice strategies instead of custom one.
343 ## [3.0.3] - 2023-10-19
347 - Avoid null exception at sending message to worker.
348 - Avoid null exception at checking worker node readiness.
350 ## [3.0.2] - 2023-10-17
354 - 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).
356 ## [3.0.1] - 2023-10-16
360 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
364 - Switch the worker node eventing code to `EventTarget` API.
366 ## [3.0.0] - 2023-10-08
370 - Remove Node.js 16.x.x (EOL) support.
372 ## [2.7.5] - 2023-10-03
376 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
378 ## [2.7.4] - 2023-09-25
382 - Fix source maps (bundler issue).
384 ## [2.7.3] - 2023-09-24
388 - Convert pool event emitter to event emitter async resource.
390 ## [2.7.2] - 2023-09-23
394 - Add source maps to npm package to ease debugging.
398 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
400 ## [2.7.1] - 2023-09-20
404 - Ensure worker message listener used one time are removed after usage.
406 ## [2.7.0] - 2023-09-19
410 - Fix task stealing related tasks queue options handling at runtime.
414 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
418 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
419 - Stricter worker constructor arguments validation.
421 ## [2.6.45] - 2023-09-17
425 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
429 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
430 - Add `start()` method to pool API to start the minimum number of workers.
431 - Add `taskStealing` and `tasksStealingOnBackPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
432 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
434 ## [2.6.44] - 2023-09-08
438 - Use a dedicated PAT to publish on GitHub packages registry.
442 - Publish on GitHub packages registry on release.
446 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
448 ## [2.6.43] - 2023-09-08
452 - Publish on GitHub packages registry on release.
456 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
458 ## [2.6.42] - 2023-09-06
462 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
464 ## [2.6.41] - 2023-09-03
468 - Optimize worker choice strategies implementation.
470 ## [2.6.40] - 2023-09-01
474 - Do not pre-choose in WRR worker choice strategy to avoid bias.
475 - Avoid array out of bound in worker choice strategies after worker node removal.
477 ## [2.6.39] - 2023-08-30
481 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
483 ## [2.6.38] - 2023-08-30
487 - Bundle typescript types declaration into one file.
491 - Improve interleaved weighted round robin worker choice strategy implementation.
493 ## [2.6.37] - 2023-08-28
497 - Ensure unused worker usage statistics are deleted at runtime.
501 - Rename worker choice strategy options `choiceRetries` to `retries`.
502 - Avoid unnecessary branching in worker choice strategies.
504 ## [2.6.36] - 2023-08-27
508 - Fix pool `execute()` arguments check.
512 - Make continuous tasks stealing algorithm less aggressive.
513 - Fine tune tasks stealing algorithm under back pressure.
515 ## [2.6.35] - 2023-08-25
519 - Don't account worker usage statistics for tasks that have failed.
520 - Fix pool information runtime and wait time median computation.
524 - Update simple moving average implementation to use a circular buffer.
525 - Update simple moving median implementation to use a circular buffer.
526 - Account for stolen tasks in worker usage statistics and pool information.
530 - Continuous tasks stealing algorithm.
532 ## [2.6.34] - 2023-08-24
536 - Avoid cascading tasks stealing under back pressure.
540 - Add fastpath to queued tasks rescheduling.
542 ## [2.6.33] - 2023-08-24
546 - Fix queued tasks rescheduling.
550 - Rename tasks queue options `queueMaxSize` to `size`.
554 - Task stealing scheduling algorithm if tasks queueing is enabled.
556 ## [2.6.32] - 2023-08-23
560 - Ensure no task can be executed when the pool is destroyed.
564 - Add `queueMaxSize` option to tasks queue options.
565 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
566 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
568 ## [2.6.31] - 2023-08-20
572 - Fix worker choice strategy retries mechanism in some edge cases.
576 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
577 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
579 ## [2.6.30] - 2023-08-19
583 - Ensure pool event `backPressure` is emitted.
584 - Ensure pool event `full` is emitted only once.
585 - Ensure worker node cannot be instantiated without proper arguments.
587 ## [2.6.29] - 2023-08-18
591 - Fix race condition between readiness and task functions worker message handling at startup.
592 - Fix duplicate task function worker usage statistics computation per task function.
593 - Update task function worker usage statistics if and only if there's at least two different task functions.
594 - Fix race condition at task function worker usage executing task computation leading to negative value.
598 - 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).
599 - Use back pressure detection in worker choice strategies.
600 - Add worker choice strategies retries mechanism if no worker is eligible.
602 ## [2.6.28] - 2023-08-16
606 - Ensure pool workers are properly initialized.
610 - HTTP server pool examples: express-cluster, express-hybrid.
614 - Remove now useless branching in worker hot code path.
616 ## [2.6.27] - 2023-08-15
620 - Add `KillHandler` type definition to exported types.
624 - Add `destroy` event to pool API.
626 ## [2.6.26] - 2023-08-15
630 - Add kill handler to worker options allowing to execute custom code when worker is killed.
631 - Add `listTaskFunctions()` method to pool API.
632 - SMTP client pool example: nodemailer.
634 ## [2.6.25] - 2023-08-13
638 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
639 - WebSocket server pool examples: ws-cluster, ws-hybrid.
641 ## [2.6.24] - 2023-08-12
645 - Add array of transferable objects to the `execute()` method arguments.
646 - WebSocket server pool examples: ws-worker_threads.
648 ## [2.6.23] - 2023-08-11
652 - 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.
656 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
657 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
659 ## [2.6.22] - 2023-08-10
663 - Add missing `types` field to package.json `exports`.
667 - Structure markdown documentation (PR #811).
669 ## [2.6.21] - 2023-08-03
673 - Improve code documentation.
674 - Code refactoring and cleanup for better maintainability and readability.
676 ## [2.6.20] - 2023-07-21
680 - Fix queued tasks redistribution on error task execution starvation.
681 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
685 - Drastically reduce lookups by worker in the worker nodes.
687 ## [2.6.19] - 2023-07-20
691 - Dedicated internal communication channel for worker_threads pools.
693 ## [2.6.18] - 2023-07-19
697 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
699 ## [2.6.17] - 2023-07-16
703 - Add `listTaskFunctions()` method to worker API.
705 ## [2.6.16] - 2023-07-12
709 - Fix pool startup detection.
710 - Fix worker task functions handling.
712 ## [2.6.15] - 2023-07-11
716 - Take into account worker node readiness in worker choice strategies.
718 ## [2.6.14] - 2023-07-10
722 - Fix task function statistics tracking.
724 ## [2.6.13] - 2023-07-10
728 - Add per task function statistics tracking.
729 - Add public methods to manipulate the worker task functions at runtime.
731 ## [2.6.12] - 2023-07-09
735 - Workaround import issue with `node:os` module in node 16.x.x.
737 ## [2.6.11] - 2023-07-09
741 - Fix pool readiness semantic.
743 ## [2.6.10] - 2023-07-08
747 - Ensure workers are not recreated on error at pool startup.
751 - Add `ready` and `strategy` fields to pool information.
752 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
753 - Add dynamic pool sizing checks.
755 ## [2.6.9] - 2023-07-07
759 - Recreate the right worker type on uncaught exception.
763 - Add minimum and maximum to internal measurement statistics.
764 - Add `runTime` and `waitTime` to pool information.
765 - Check worker inactive time only on dynamic worker.
767 ## [2.6.8] - 2023-07-03
771 - Brown paper bag release to fix version handling in pool information.
773 ## [2.6.7] - 2023-07-03
777 - Ensure worker queued tasks at error are reassigned to other pool workers.
781 - Add pool `utilization` ratio to pool information.
782 - Add `version` to pool information.
783 - Add worker information to worker nodes.
785 ## [2.6.6] - 2023-07-01
789 - Add safe helper `availableParallelism()` to help sizing the pool.
793 - Ensure message handler is only registered in worker.
795 ## [2.6.5] - 2023-06-27
799 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
803 - Artificial version bump to 2.6.5 to workaround publication issue.
804 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
805 - Ensure pool event is emitted before task error promise rejection.
806 - Fix queued tasks count computation.
810 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
812 ## [2.6.4] - 2023-06-27
816 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
820 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
821 - Ensure pool event is emitted before task error promise rejection.
822 - Fix queued tasks count computation.
826 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
828 ## [2.6.3] - 2023-06-19
832 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
833 - Update strategies internals after statistics computation.
837 - Optimize O(1) queue implementation.
839 ## [2.6.2] - 2023-06-12
843 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
845 ## [2.6.1] - 2023-06-10
849 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
853 - Fix average statistics computation: ensure failed tasks are not accounted.
855 ## [2.6.0] - 2023-06-09
859 - Add `LEAST_ELU` worker choice strategy (experimental).
860 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
864 - Refactor pool worker node usage internals.
865 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
866 - Breaking change: pool information `info` property object fields have been renamed.
870 - Fix wait time accounting.
871 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
872 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
874 ## [2.5.4] - 2023-06-07
878 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
882 - Compute statistics at the worker level only if needed.
883 - Add `worker_threads` options to thread pool options.
887 - Make the `LEAST_BUSY` strategy only relies on task runtime.
889 ## [2.5.3] - 2023-06-04
893 - Refine pool information content.
894 - Limit pool internals public exposure.
896 ## [2.5.2] - 2023-06-02
900 - Add `taskError` pool event for task execution error.
901 - Add pool information `info` property to pool.
902 - Emit pool information on `busy` and `full` pool events.
904 ## [2.5.1] - 2023-06-01
908 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
909 - Add `error` pool event for uncaught worker error.
911 ## [2.5.0] - 2023-05-31
915 - Switch pool event emitter to `EventEmitterAsyncResource`.
916 - Add tasks wait time accounting in per worker tasks usage.
917 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
921 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
923 ## [2.4.14] - 2023-05-09
927 - Ensure no undefined task runtime can land in the tasks history.
928 - Fix median computation implementation once again.
932 - Unit tests for median and queue implementations.
934 ## [2.4.13] - 2023-05-08
938 - Fix worker choice strategy options validation.
939 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
941 ## [2.4.12] - 2023-05-06
945 - Support multiple task functions per worker.
946 - Add custom worker weights support to worker choice strategies options.
950 - Use O(1) queue implementation for tasks queueing.
954 - Fix median computation implementation.
955 - Fix fair share worker choice strategy internals update.
957 ## [2.4.11] - 2023-04-23
961 - Optimize free worker finding in worker choice strategies.
963 ## [2.4.10] - 2023-04-15
967 - Fix typescript type definition for task function: ensure the input data is optional.
968 - Fix typescript type definition for pool execute(): ensure the input data is optional.
970 ## [2.4.9] - 2023-04-15
974 - Add tasks queue enablement runtime setter to pool.
975 - Add tasks queue options runtime setter to pool.
976 - Add worker choice strategy options runtime setter to pool.
980 - Remove the tasks queuing experimental status.
984 - Fix task function type definition and validation.
985 - Fix worker choice strategy options handling.
987 ## [2.4.8] - 2023-04-12
991 - Fix message between main worker and worker type definition for tasks.
992 - Fix code documentation.
994 ## [2.4.7] - 2023-04-11
998 - Add worker tasks queue options to pool options.
1002 - Fix missing documentation.
1004 ## [2.4.6] - 2023-04-10
1008 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1009 - Properly count worker executing tasks with tasks queueing enabled.
1011 ## [2.4.5] - 2023-04-09
1015 - Use monotonic high resolution timer for worker tasks runtime.
1016 - Add worker tasks median runtime to statistics.
1017 - Add worker tasks queue (experimental).
1019 ## [2.4.4] - 2023-04-07
1023 - Add `PoolEvents` enumeration and `PoolEvent` type.
1027 - Destroy worker only on alive check.
1029 ## [2.4.3] - 2023-04-07
1033 - Fix typedoc generation with inheritance.
1035 ## [2.4.2] - 2023-04-06
1039 - Add `full` event to dynamic pool.
1040 - Keep worker choice strategy in memory for conditional reuse.
1044 - Fix possible negative worker key at worker removal in worker choice strategies.
1046 ## [2.4.1] - 2023-04-05
1050 - Optimize worker choice strategy for dynamic pool.
1054 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1056 ## [2.4.0] - 2023-04-04
1060 - Add `LESS_BUSY` worker choice strategy.
1064 - Optimize worker storage in pool.
1065 - Optimize worker alive status check.
1066 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1067 - Optimize `LESS_USED` worker choice strategy.
1068 - Update benchmark versus external threads pools.
1069 - Optimize tasks usage statistics requirements for worker choice strategy.
1073 - Ensure trimmable characters are checked at pool initialization.
1074 - Fix message id integer overflow.
1075 - Fix pool worker removal in worker choice strategy internals.
1076 - Fix package publication with pnpm.
1078 ## [2.4.0-3] - 2023-04-04
1082 - Add `LESS_BUSY` worker choice strategy.
1086 - Optimize worker storage in pool.
1087 - Optimize worker alive status check.
1088 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1089 - Optimize `LESS_USED` worker choice strategy.
1090 - Update benchmark versus external threads pools.
1094 - Ensure trimmable characters are checked at pool initialization.
1095 - Fix message id integer overflow.
1096 - Fix pool worker removal in worker choice strategy internals.
1097 - Fix package publication with pnpm.
1099 ## [2.4.0-2] - 2023-04-03
1103 - Add `LESS_BUSY` worker choice strategy.
1107 - Optimize worker storage in pool.
1108 - Optimize worker alive status check.
1109 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1110 - Optimize `LESS_USED` worker choice strategy.
1114 - Ensure trimmable characters are checked at pool initialization.
1115 - Fix message id integer overflow.
1116 - Fix pool worker removal in worker choice strategy internals.
1117 - Fix package publication with pnpm.
1119 ## [2.4.0-1] - 2023-04-03
1123 - Add `LESS_BUSY` worker choice strategy.
1127 - Optimize worker storage in pool.
1128 - Optimize worker alive status check.
1129 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1130 - Optimize `LESS_USED` worker choice strategy.
1134 - Ensure trimmable characters are checked at pool initialization.
1135 - Fix message id integer overflow.
1136 - Fix pool worker removal in worker choice strategy internals.
1138 ## [2.4.0-0] - 2023-04-03
1142 - Add `LESS_BUSY` worker choice strategy.
1146 - Optimize worker storage in pool.
1147 - Optimize worker alive status check.
1148 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1149 - Optimize `LESS_USED` worker choice strategy.
1153 - Ensure trimmable characters are checked at pool initialization.
1154 - Fix message id integer overflow.
1155 - Fix pool worker removal in worker choice strategy internals.
1157 ## [2.3.10] - 2023-03-18
1161 - Fix package.json `exports` syntax for ESM and CommonJS.
1165 - Permit SemVer pre-release publication.
1167 ## [2.3.10-2] - 2023-03-18
1171 - Fix package.json `exports` syntax for ESM and CommonJS.
1173 ## [2.3.10-1] - 2023-03-18
1177 - Permit SemVer pre-release publication.
1179 ## [2.3.10-0] - 2023-03-18
1183 - Fix package.json `exports` syntax for ESM and CommonJS.
1185 ## [2.3.9] - 2023-03-18
1189 - Introduce ESM module support along with CommonJS one.
1193 - Fix brown paper bag bug referencing the same object literal.
1195 ## [2.3.8] - 2023-03-18
1199 - Switch internal benchmarking code to benny.
1200 - Switch to TypeScript 5.x.x.
1201 - Switch rollup bundler plugins to core ones.
1202 - Switch to TSDoc syntax.
1203 - Enforce conventional commits.
1207 - Fix random integer generator.
1208 - Fix worker choice strategy pool type identification at initialization.
1210 ## [2.3.7] - 2022-10-23
1214 - Switch to open collective FOSS project funding platform.
1215 - Switch to ts-standard linter configuration on TypeScript code.
1219 - Fixed missing async on pool execute method.
1220 - Fixed typing in TypeScript example.
1221 - Fixed types in unit tests.
1223 ## [2.3.6] - 2022-10-22
1227 - Cleanup pool attributes and methods.
1228 - Refine error types thrown.
1232 - Fix continuous integration build on windows.
1233 - Fix code coverage reporting by using c8 instead of nyc.
1235 ## [2.3.5] - 2022-10-21
1239 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1240 - Optimize tasks usage lookup implementation.
1244 - Fix missed pool event emitter type export.
1245 - Fix typedoc documentation generation.
1247 ## [2.3.4] - 2022-10-17
1251 - Fully automate release process with release-it.
1255 - Optimize fair share task scheduling algorithm implementation.
1256 - Update benchmark versus external pools results with latest version.
1258 ## [2.3.3] - 2022-10-15
1262 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1264 ## [2.3.2] - 2022-10-14
1268 - Optimize fair share worker selection strategy implementation.
1272 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1274 ## [2.3.1] - 2022-10-13
1278 - Pool worker choice strategies:
1279 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1280 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1282 ## [2.2.2] - 2022-10-09
1286 - Fixed `README.md` file.
1288 ## [2.2.1] - 2022-10-08
1292 - Dynamic worker choice strategy change at runtime.
1294 ## [2.2.0] - 2022-01-05
1296 ### Breaking Changes
1298 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1300 ## [2.1.0] - 2021-08-29
1304 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1306 ### Breaking Changes
1308 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1309 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1310 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1311 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1313 ## [2.0.2] - 2021-05-12
1317 - Fix `busy` event emission on fixed pool type
1319 ## [2.0.1] - 2021-03-16
1323 - Check if pool options are properly set.
1324 - `busy` event is emitted on all pool types.
1326 ## [2.0.0] - 2021-03-01
1330 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1332 ### Breaking Changes
1334 - `FullPool` event is now renamed to `busy`.
1335 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1336 _Find more details on our JSDoc._
1338 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1340 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1342 ### Pool options types declaration merge
1344 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1346 #### New `export` strategy
1350 const DynamicThreadPool = require('poolifier/lib/dynamic')
1352 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1355 But you should always prefer just using
1358 const { DynamicThreadPool } = require('poolifier')
1361 #### New type definitions for input data and response
1363 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1364 _This is not a limitation by poolifier but Node.js._
1366 #### Public property replacements
1368 `numWorkers` property is now `numberOfWorkers`
1370 #### Internal (protected) properties and methods renaming
1372 These properties are not intended for end users
1374 - `id` => `nextMessageId`
1376 These methods are not intended for end users
1378 - `_chooseWorker` => `chooseWorker`
1379 - `_newWorker` => `createWorker`
1380 - `_execute` => `internalExecute`
1381 - `_chooseWorker` => `chooseWorker`
1382 - `_checkAlive` => `checkAlive`
1384 - `_runAsync` => `runAsync`
1386 ## [1.1.0] - 2020-05-21
1390 - ThreadWorker support async functions as option
1391 - Various external library patches
1393 ## [1.0.0] - 2020-01-24
1397 - FixedThreadPool implementation
1398 - DynamicThreadPool implementation
1399 - WorkerThread implementation to improve developer experience