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).
12 - Fix `transferList` argument type definition.
14 ## [3.1.29] - 2024-04-02
18 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
20 ## [3.1.28] - 2024-04-01
24 - Ensure the minimum number of workers on a started pool is guaranteed.
26 ## [3.1.27] - 2024-03-27
30 - Fix publishing on JSR, take 4.
32 ## [3.1.26] - 2024-03-27
36 - Fix publishing on JSR, take 3.
38 ## [3.1.25] - 2024-03-27
42 - Fix publishing on JSR, take 2.
44 ## [3.1.24] - 2024-03-27
48 - Fix publishing on JSR.
50 ## [3.1.23] - 2024-03-27
56 ## [3.1.22] - 2024-03-15
60 - Fix pool event emitter registered callbacks removal at `destroy()`.
62 ## [3.1.21] - 2024-02-22
66 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
68 ## [3.1.20] - 2024-02-11
72 - Ensure `worker_threads` workers are unreferenced at termination.
74 ## [3.1.19] - 2024-01-16
78 - Fix possible null exception at task finishing handling.
82 - Optimize Deque implementation to improve tasks queueing performance.
84 ## [3.1.18] - 2024-01-06
88 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
90 ## [3.1.17] - 2024-01-05
94 - Improve performance by clean up unneeded condition checks on hot code paths.
96 ## [3.1.16] - 2024-01-03
100 - Add missing type to TS type definitions.
102 ## [3.1.15] - 2024-01-02
106 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
108 ## [3.1.15-0] - 2024-01-02
112 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
114 ## [3.1.14] - 2024-01-01
118 - Properly handle dynamic pool with zero minimum size.
120 ## [3.1.13] - 2023-12-30
124 - Reduce branching in several hot code paths.
125 - Use faster object cloning implementation.
127 ## [3.1.12] - 2023-12-27
131 - Fix tasks redistribution triggers at pool destroying.
135 - Switch TypeScript module resolution to Node16.
137 ## [3.1.12-0] - 2023-12-27
141 - Fix tasks redistribution triggers at pool destroying.
143 ## [3.1.11] - 2023-12-24
147 - Avoid worker node cross tasks stealing.
148 - Ensure only half the pool worker nodes can steal tasks.
150 ## [3.1.10] - 2023-12-23
154 - Avoid useless branching on pool type.
156 ## [3.1.9] - 2023-12-22
160 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
162 ## [3.1.8] - 2023-12-21
166 - Fix default worker weight computation.
167 - Fix possible null exception at pool destroying.
169 ## [3.1.7] - 2023-12-20
173 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
175 ## [3.1.6] - 2023-12-18
179 - Fix pool destroying with tasks queuing enabled.
181 ## [3.1.5] - 2023-12-18
185 - Add queued tasks end timeout support to worker node termination.
187 ## [3.1.4] - 2023-12-18
191 - Make more robust the fix for possible null exception at handling task execution response.
193 ## [3.1.3] - 2023-12-17
197 - Fix possible null exception at handling task execution response.
199 ## [3.1.2] - 2023-12-17
203 - Wait for queued tasks to end at worker node termination.
205 ## [3.1.1] - 2023-12-16
209 - Fix pool options TS type definition.
211 ## [3.1.0] - 2023-12-16
215 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
217 ## [3.0.14] - 2023-12-13
221 - Fix possible null exception with worker_threads pools.
223 ## [3.0.13] - 2023-12-12
227 - Ensure worker choice strategy wait for worker nodes readiness.
231 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
233 ## [3.0.12] - 2023-12-12
237 - Add infinite retries support in worker choice strategy.
239 ## [3.0.11] - 2023-12-11
243 - Ensure pool asynchronous resource properly track tasks execution.
245 ## [3.0.10] - 2023-12-08
249 - Add a fastpath when tasks stealing or redistribution is impossible.
251 ## [3.0.9] - 2023-11-26
255 - Remove all pool events listener at pool destroying.
256 - Remove all worker node events listener at worker node destroying.
257 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
259 ## [3.0.8] - 2023-11-25
263 - Ensure continuous tasks stealing on idle start at worker node idling.
265 ## [3.0.7] - 2023-11-24
269 - Make continuous tasks stealing start at worker node idling.
271 ## [3.0.6] - 2023-11-24
275 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
276 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
278 ## [3.0.5] - 2023-10-27
282 - Ensure pool `ready` event can be emitted only once.
284 ## [3.0.4] - 2023-10-20
288 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
289 - Use builtin retry mechanism in worker choice strategies instead of custom one.
291 ## [3.0.3] - 2023-10-19
295 - Avoid null exception at sending message to worker.
296 - Avoid null exception at checking worker node readiness.
298 ## [3.0.2] - 2023-10-17
302 - 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).
304 ## [3.0.1] - 2023-10-16
308 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
312 - Switch the worker node eventing code to `EventTarget` API.
314 ## [3.0.0] - 2023-10-08
318 - Remove Node.js 16.x.x (EOL) support.
320 ## [2.7.5] - 2023-10-03
324 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
326 ## [2.7.4] - 2023-09-25
330 - Fix source maps (bundler issue).
332 ## [2.7.3] - 2023-09-24
336 - Convert pool event emitter to event emitter async resource.
338 ## [2.7.2] - 2023-09-23
342 - Add source maps to npm package to ease debugging.
346 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
348 ## [2.7.1] - 2023-09-20
352 - Ensure worker message listener used one time are removed after usage.
354 ## [2.7.0] - 2023-09-19
358 - Fix task stealing related tasks queue options handling at runtime.
362 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
366 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
367 - Stricter worker constructor arguments validation.
369 ## [2.6.45] - 2023-09-17
373 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
377 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
378 - Add `start()` method to pool API to start the minimum number of workers.
379 - 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.
380 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
382 ## [2.6.44] - 2023-09-08
386 - Use a dedicated PAT to publish on GitHub packages registry.
390 - Publish on GitHub packages registry on release.
394 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
396 ## [2.6.43] - 2023-09-08
400 - Publish on GitHub packages registry on release.
404 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
406 ## [2.6.42] - 2023-09-06
410 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
412 ## [2.6.41] - 2023-09-03
416 - Optimize worker choice strategies implementation.
418 ## [2.6.40] - 2023-09-01
422 - Do not pre-choose in WRR worker choice strategy to avoid bias.
423 - Avoid array out of bound in worker choice strategies after worker node removal.
425 ## [2.6.39] - 2023-08-30
429 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
431 ## [2.6.38] - 2023-08-30
435 - Bundle typescript types declaration into one file.
439 - Improve interleaved weighted round robin worker choice strategy implementation.
441 ## [2.6.37] - 2023-08-28
445 - Ensure unused worker usage statistics are deleted at runtime.
449 - Rename worker choice strategy options `choiceRetries` to `retries`.
450 - Avoid unnecessary branching in worker choice strategies.
452 ## [2.6.36] - 2023-08-27
456 - Fix pool `execute()` arguments check.
460 - Make continuous tasks stealing algorithm less aggressive.
461 - Fine tune tasks stealing algorithm under back pressure.
463 ## [2.6.35] - 2023-08-25
467 - Don't account worker usage statistics for tasks that have failed.
468 - Fix pool information runtime and wait time median computation.
472 - Update simple moving average implementation to use a circular buffer.
473 - Update simple moving median implementation to use a circular buffer.
474 - Account for stolen tasks in worker usage statistics and pool information.
478 - Continuous tasks stealing algorithm.
480 ## [2.6.34] - 2023-08-24
484 - Avoid cascading tasks stealing under back pressure.
488 - Add fastpath to queued tasks rescheduling.
490 ## [2.6.33] - 2023-08-24
494 - Fix queued tasks rescheduling.
498 - Rename tasks queue options `queueMaxSize` to `size`.
502 - Task stealing scheduling algorithm if tasks queueing is enabled.
504 ## [2.6.32] - 2023-08-23
508 - Ensure no task can be executed when the pool is destroyed.
512 - Add `queueMaxSize` option to tasks queue options.
513 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
514 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
516 ## [2.6.31] - 2023-08-20
520 - Fix worker choice strategy retries mechanism in some edge cases.
524 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
525 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
527 ## [2.6.30] - 2023-08-19
531 - Ensure pool event `backPressure` is emitted.
532 - Ensure pool event `full` is emitted only once.
533 - Ensure worker node cannot be instantiated without proper arguments.
535 ## [2.6.29] - 2023-08-18
539 - Fix race condition between readiness and task functions worker message handling at startup.
540 - Fix duplicate task function worker usage statistics computation per task function.
541 - Update task function worker usage statistics if and only if there's at least two different task functions.
542 - Fix race condition at task function worker usage executing task computation leading to negative value.
546 - 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).
547 - Use back pressure detection in worker choice strategies.
548 - Add worker choice strategies retries mechanism if no worker is eligible.
550 ## [2.6.28] - 2023-08-16
554 - Ensure pool workers are properly initialized.
558 - HTTP server pool examples: express-cluster, express-hybrid.
562 - Remove now useless branching in worker hot code path.
564 ## [2.6.27] - 2023-08-15
568 - Add `KillHandler` type definition to exported types.
572 - Add `destroy` event to pool API.
574 ## [2.6.26] - 2023-08-15
578 - Add kill handler to worker options allowing to execute custom code when worker is killed.
579 - Add `listTaskFunctions()` method to pool API.
580 - SMTP client pool example: nodemailer.
582 ## [2.6.25] - 2023-08-13
586 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
587 - WebSocket server pool examples: ws-cluster, ws-hybrid.
589 ## [2.6.24] - 2023-08-12
593 - Add array of transferable objects to the `execute()` method arguments.
594 - WebSocket server pool examples: ws-worker_threads.
596 ## [2.6.23] - 2023-08-11
600 - 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.
604 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
605 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
607 ## [2.6.22] - 2023-08-10
611 - Add missing `types` field to package.json `exports`.
615 - Structure markdown documentation (PR #811).
617 ## [2.6.21] - 2023-08-03
621 - Improve code documentation.
622 - Code refactoring and cleanup for better maintainability and readability.
624 ## [2.6.20] - 2023-07-21
628 - Fix queued tasks redistribution on error task execution starvation.
629 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
633 - Drastically reduce lookups by worker in the worker nodes.
635 ## [2.6.19] - 2023-07-20
639 - Dedicated internal communication channel for worker_threads pools.
641 ## [2.6.18] - 2023-07-19
645 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
647 ## [2.6.17] - 2023-07-16
651 - Add `listTaskFunctions()` method to worker API.
653 ## [2.6.16] - 2023-07-12
657 - Fix pool startup detection.
658 - Fix worker task functions handling.
660 ## [2.6.15] - 2023-07-11
664 - Take into account worker node readiness in worker choice strategies.
666 ## [2.6.14] - 2023-07-10
670 - Fix task function statistics tracking.
672 ## [2.6.13] - 2023-07-10
676 - Add per task function statistics tracking.
677 - Add public methods to manipulate the worker task functions at runtime.
679 ## [2.6.12] - 2023-07-09
683 - Workaround import issue with `node:os` module in node 16.x.x.
685 ## [2.6.11] - 2023-07-09
689 - Fix pool readiness semantic.
691 ## [2.6.10] - 2023-07-08
695 - Ensure workers are not recreated on error at pool startup.
699 - Add `ready` and `strategy` fields to pool information.
700 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
701 - Add dynamic pool sizing checks.
703 ## [2.6.9] - 2023-07-07
707 - Recreate the right worker type on uncaught exception.
711 - Add minimum and maximum to internal measurement statistics.
712 - Add `runTime` and `waitTime` to pool information.
713 - Check worker inactive time only on dynamic worker.
715 ## [2.6.8] - 2023-07-03
719 - Brown paper bag release to fix version handling in pool information.
721 ## [2.6.7] - 2023-07-03
725 - Ensure worker queued tasks at error are reassigned to other pool workers.
729 - Add pool `utilization` ratio to pool information.
730 - Add `version` to pool information.
731 - Add worker information to worker nodes.
733 ## [2.6.6] - 2023-07-01
737 - Add safe helper `availableParallelism()` to help sizing the pool.
741 - Ensure message handler is only registered in worker.
743 ## [2.6.5] - 2023-06-27
747 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
751 - Artificial version bump to 2.6.5 to workaround publication issue.
752 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
753 - Ensure pool event is emitted before task error promise rejection.
754 - Fix queued tasks count computation.
758 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
760 ## [2.6.4] - 2023-06-27
764 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
768 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
769 - Ensure pool event is emitted before task error promise rejection.
770 - Fix queued tasks count computation.
774 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
776 ## [2.6.3] - 2023-06-19
780 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
781 - Update strategies internals after statistics computation.
785 - Optimize O(1) queue implementation.
787 ## [2.6.2] - 2023-06-12
791 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
793 ## [2.6.1] - 2023-06-10
797 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
801 - Fix average statistics computation: ensure failed tasks are not accounted.
803 ## [2.6.0] - 2023-06-09
807 - Add `LEAST_ELU` worker choice strategy (experimental).
808 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
812 - Refactor pool worker node usage internals.
813 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
814 - Breaking change: pool information `info` property object fields have been renamed.
818 - Fix wait time accounting.
819 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
820 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
822 ## [2.5.4] - 2023-06-07
826 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
830 - Compute statistics at the worker level only if needed.
831 - Add `worker_threads` options to thread pool options.
835 - Make the `LEAST_BUSY` strategy only relies on task runtime.
837 ## [2.5.3] - 2023-06-04
841 - Refine pool information content.
842 - Limit pool internals public exposure.
844 ## [2.5.2] - 2023-06-02
848 - Add `taskError` pool event for task execution error.
849 - Add pool information `info` property to pool.
850 - Emit pool information on `busy` and `full` pool events.
852 ## [2.5.1] - 2023-06-01
856 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
857 - Add `error` pool event for uncaught worker error.
859 ## [2.5.0] - 2023-05-31
863 - Switch pool event emitter to `EventEmitterAsyncResource`.
864 - Add tasks wait time accounting in per worker tasks usage.
865 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
869 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
871 ## [2.4.14] - 2023-05-09
875 - Ensure no undefined task runtime can land in the tasks history.
876 - Fix median computation implementation once again.
880 - Unit tests for median and queue implementations.
882 ## [2.4.13] - 2023-05-08
886 - Fix worker choice strategy options validation.
887 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
889 ## [2.4.12] - 2023-05-06
893 - Support multiple task functions per worker.
894 - Add custom worker weights support to worker choice strategies options.
898 - Use O(1) queue implementation for tasks queueing.
902 - Fix median computation implementation.
903 - Fix fair share worker choice strategy internals update.
905 ## [2.4.11] - 2023-04-23
909 - Optimize free worker finding in worker choice strategies.
911 ## [2.4.10] - 2023-04-15
915 - Fix typescript type definition for task function: ensure the input data is optional.
916 - Fix typescript type definition for pool execute(): ensure the input data is optional.
918 ## [2.4.9] - 2023-04-15
922 - Add tasks queue enablement runtime setter to pool.
923 - Add tasks queue options runtime setter to pool.
924 - Add worker choice strategy options runtime setter to pool.
928 - Remove the tasks queuing experimental status.
932 - Fix task function type definition and validation.
933 - Fix worker choice strategy options handling.
935 ## [2.4.8] - 2023-04-12
939 - Fix message between main worker and worker type definition for tasks.
940 - Fix code documentation.
942 ## [2.4.7] - 2023-04-11
946 - Add worker tasks queue options to pool options.
950 - Fix missing documentation.
952 ## [2.4.6] - 2023-04-10
956 - Ensure one task at a time is executed per worker with tasks queueing enabled.
957 - Properly count worker executing tasks with tasks queueing enabled.
959 ## [2.4.5] - 2023-04-09
963 - Use monotonic high resolution timer for worker tasks runtime.
964 - Add worker tasks median runtime to statistics.
965 - Add worker tasks queue (experimental).
967 ## [2.4.4] - 2023-04-07
971 - Add `PoolEvents` enumeration and `PoolEvent` type.
975 - Destroy worker only on alive check.
977 ## [2.4.3] - 2023-04-07
981 - Fix typedoc generation with inheritance.
983 ## [2.4.2] - 2023-04-06
987 - Add `full` event to dynamic pool.
988 - Keep worker choice strategy in memory for conditional reuse.
992 - Fix possible negative worker key at worker removal in worker choice strategies.
994 ## [2.4.1] - 2023-04-05
998 - Optimize worker choice strategy for dynamic pool.
1002 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1004 ## [2.4.0] - 2023-04-04
1008 - Add `LESS_BUSY` worker choice strategy.
1012 - Optimize worker storage in pool.
1013 - Optimize worker alive status check.
1014 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1015 - Optimize `LESS_USED` worker choice strategy.
1016 - Update benchmark versus external threads pools.
1017 - Optimize tasks usage statistics requirements for worker choice strategy.
1021 - Ensure trimmable characters are checked at pool initialization.
1022 - Fix message id integer overflow.
1023 - Fix pool worker removal in worker choice strategy internals.
1024 - Fix package publication with pnpm.
1026 ## [2.4.0-3] - 2023-04-04
1030 - Add `LESS_BUSY` worker choice strategy.
1034 - Optimize worker storage in pool.
1035 - Optimize worker alive status check.
1036 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1037 - Optimize `LESS_USED` worker choice strategy.
1038 - Update benchmark versus external threads pools.
1042 - Ensure trimmable characters are checked at pool initialization.
1043 - Fix message id integer overflow.
1044 - Fix pool worker removal in worker choice strategy internals.
1045 - Fix package publication with pnpm.
1047 ## [2.4.0-2] - 2023-04-03
1051 - Add `LESS_BUSY` worker choice strategy.
1055 - Optimize worker storage in pool.
1056 - Optimize worker alive status check.
1057 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1058 - Optimize `LESS_USED` worker choice strategy.
1062 - Ensure trimmable characters are checked at pool initialization.
1063 - Fix message id integer overflow.
1064 - Fix pool worker removal in worker choice strategy internals.
1065 - Fix package publication with pnpm.
1067 ## [2.4.0-1] - 2023-04-03
1071 - Add `LESS_BUSY` worker choice strategy.
1075 - Optimize worker storage in pool.
1076 - Optimize worker alive status check.
1077 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1078 - Optimize `LESS_USED` worker choice strategy.
1082 - Ensure trimmable characters are checked at pool initialization.
1083 - Fix message id integer overflow.
1084 - Fix pool worker removal in worker choice strategy internals.
1086 ## [2.4.0-0] - 2023-04-03
1090 - Add `LESS_BUSY` worker choice strategy.
1094 - Optimize worker storage in pool.
1095 - Optimize worker alive status check.
1096 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1097 - Optimize `LESS_USED` worker choice strategy.
1101 - Ensure trimmable characters are checked at pool initialization.
1102 - Fix message id integer overflow.
1103 - Fix pool worker removal in worker choice strategy internals.
1105 ## [2.3.10] - 2023-03-18
1109 - Fix package.json `exports` syntax for ESM and CommonJS.
1113 - Permit SemVer pre-release publication.
1115 ## [2.3.10-2] - 2023-03-18
1119 - Fix package.json `exports` syntax for ESM and CommonJS.
1121 ## [2.3.10-1] - 2023-03-18
1125 - Permit SemVer pre-release publication.
1127 ## [2.3.10-0] - 2023-03-18
1131 - Fix package.json `exports` syntax for ESM and CommonJS.
1133 ## [2.3.9] - 2023-03-18
1137 - Introduce ESM module support along with CommonJS one.
1141 - Fix brown paper bag bug referencing the same object literal.
1143 ## [2.3.8] - 2023-03-18
1147 - Switch internal benchmarking code to benny.
1148 - Switch to TypeScript 5.x.x.
1149 - Switch rollup bundler plugins to core ones.
1150 - Switch to TSDoc syntax.
1151 - Enforce conventional commits.
1155 - Fix random integer generator.
1156 - Fix worker choice strategy pool type identification at initialization.
1158 ## [2.3.7] - 2022-10-23
1162 - Switch to open collective FOSS project funding platform.
1163 - Switch to ts-standard linter configuration on TypeScript code.
1167 - Fixed missing async on pool execute method.
1168 - Fixed typing in TypeScript example.
1169 - Fixed types in unit tests.
1171 ## [2.3.6] - 2022-10-22
1175 - Cleanup pool attributes and methods.
1176 - Refine error types thrown.
1180 - Fix continuous integration build on windows.
1181 - Fix code coverage reporting by using c8 instead of nyc.
1183 ## [2.3.5] - 2022-10-21
1187 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1188 - Optimize tasks usage lookup implementation.
1192 - Fix missed pool event emitter type export.
1193 - Fix typedoc documentation generation.
1195 ## [2.3.4] - 2022-10-17
1199 - Fully automate release process with release-it.
1203 - Optimize fair share task scheduling algorithm implementation.
1204 - Update benchmark versus external pools results with latest version.
1206 ## [2.3.3] - 2022-10-15
1210 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1212 ## [2.3.2] - 2022-10-14
1216 - Optimize fair share worker selection strategy implementation.
1220 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1222 ## [2.3.1] - 2022-10-13
1226 - Pool worker choice strategies:
1227 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1228 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1230 ## [2.2.2] - 2022-10-09
1234 - Fixed `README.md` file.
1236 ## [2.2.1] - 2022-10-08
1240 - Dynamic worker choice strategy change at runtime.
1242 ## [2.2.0] - 2022-01-05
1244 ### Breaking Changes
1246 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1248 ## [2.1.0] - 2021-08-29
1252 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1254 ### Breaking Changes
1256 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1257 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1258 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1259 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1261 ## [2.0.2] - 2021-05-12
1265 - Fix `busy` event emission on fixed pool type
1267 ## [2.0.1] - 2021-03-16
1271 - Check if pool options are properly set.
1272 - `busy` event is emitted on all pool types.
1274 ## [2.0.0] - 2021-03-01
1278 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1280 ### Breaking Changes
1282 - `FullPool` event is now renamed to `busy`.
1283 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1284 _Find more details on our JSDoc._
1286 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1288 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1290 ### Pool options types declaration merge
1292 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1294 #### New `export` strategy
1298 const DynamicThreadPool = require('poolifier/lib/dynamic')
1300 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1303 But you should always prefer just using
1306 const { DynamicThreadPool } = require('poolifier')
1309 #### New type definitions for input data and response
1311 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1312 _This is not a limitation by poolifier but Node.js._
1314 #### Public property replacements
1316 `numWorkers` property is now `numberOfWorkers`
1318 #### Internal (protected) properties and methods renaming
1320 These properties are not intended for end users
1322 - `id` => `nextMessageId`
1324 These methods are not intended for end users
1326 - `_chooseWorker` => `chooseWorker`
1327 - `_newWorker` => `createWorker`
1328 - `_execute` => `internalExecute`
1329 - `_chooseWorker` => `chooseWorker`
1330 - `_checkAlive` => `checkAlive`
1332 - `_runAsync` => `runAsync`
1334 ## [1.1.0] - 2020-05-21
1338 - ThreadWorker support async functions as option
1339 - Various external library patches
1341 ## [1.0.0] - 2020-01-24
1345 - FixedThreadPool implementation
1346 - DynamicThreadPool implementation
1347 - WorkerThread implementation to improve developer experience