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 - Switch to optimized circular buffer implementation to store tasks execution measurements.
14 ## [4.0.10] - 2024-05-20
18 - Ensure tasks stealing dynamic worker node is not destroyed on inactivity.
20 ## [4.0.9] - 2024-05-19
24 - Add ELU `utilization` statistics to pool information.
26 ## [4.0.8] - 2024-05-15
30 - Fix default task function worker choice strategy and priority handling.
32 ## [4.0.7] - 2024-05-13
36 - Add ELU statistics to pool information.
38 ## [4.0.6] - 2024-05-10
42 - Fix pools' `addTaskFunction()` type definition.
44 ## [4.0.5] - 2024-05-09
48 - Avoid queued tasks redistribution on the errored worker node.
50 ## [4.0.4] - 2024-05-08
54 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
56 ## [4.0.3] - 2024-05-08
60 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
62 ## [4.0.2] - 2024-05-06
66 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
68 ## [4.0.1] - 2024-05-02
72 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
73 - 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.
75 ## [4.0.0] - 2024-04-30
79 - 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 }`.
80 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
81 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
82 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
86 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
88 ## [3.1.30] - 2024-04-22
92 - Fix `transferList` argument type definition.
94 ## [3.1.29] - 2024-04-02
98 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
100 ## [3.1.28] - 2024-04-01
104 - Ensure the minimum number of workers on a started pool is guaranteed.
106 ## [3.1.27] - 2024-03-27
110 - Fix publishing on JSR, take 4.
112 ## [3.1.26] - 2024-03-27
116 - Fix publishing on JSR, take 3.
118 ## [3.1.25] - 2024-03-27
122 - Fix publishing on JSR, take 2.
124 ## [3.1.24] - 2024-03-27
128 - Fix publishing on JSR.
130 ## [3.1.23] - 2024-03-27
136 ## [3.1.22] - 2024-03-15
140 - Fix pool event emitter registered callbacks removal at `destroy()`.
142 ## [3.1.21] - 2024-02-22
146 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
148 ## [3.1.20] - 2024-02-11
152 - Ensure `worker_threads` workers are unreferenced at termination.
154 ## [3.1.19] - 2024-01-16
158 - Fix possible null exception at task finishing handling.
162 - Optimize Deque implementation to improve tasks queueing performance.
164 ## [3.1.18] - 2024-01-06
168 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
170 ## [3.1.17] - 2024-01-05
174 - Improve performance by clean up unneeded condition checks on hot code paths.
176 ## [3.1.16] - 2024-01-03
180 - Add missing type to TS type definitions.
182 ## [3.1.15] - 2024-01-02
186 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
188 ## [3.1.15-0] - 2024-01-02
192 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
194 ## [3.1.14] - 2024-01-01
198 - Properly handle dynamic pool with zero minimum size.
200 ## [3.1.13] - 2023-12-30
204 - Reduce branching in several hot code paths.
205 - Use faster object cloning implementation.
207 ## [3.1.12] - 2023-12-27
211 - Fix tasks redistribution triggers at pool destroying.
215 - Switch TypeScript module resolution to Node16.
217 ## [3.1.12-0] - 2023-12-27
221 - Fix tasks redistribution triggers at pool destroying.
223 ## [3.1.11] - 2023-12-24
227 - Avoid worker node cross tasks stealing.
228 - Ensure only half the pool worker nodes can steal tasks.
230 ## [3.1.10] - 2023-12-23
234 - Avoid useless branching on pool type.
236 ## [3.1.9] - 2023-12-22
240 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
242 ## [3.1.8] - 2023-12-21
246 - Fix default worker weight computation.
247 - Fix possible null exception at pool destroying.
249 ## [3.1.7] - 2023-12-20
253 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
255 ## [3.1.6] - 2023-12-18
259 - Fix pool destroying with tasks queuing enabled.
261 ## [3.1.5] - 2023-12-18
265 - Add queued tasks end timeout support to worker node termination.
267 ## [3.1.4] - 2023-12-18
271 - Make more robust the fix for possible null exception at handling task execution response.
273 ## [3.1.3] - 2023-12-17
277 - Fix possible null exception at handling task execution response.
279 ## [3.1.2] - 2023-12-17
283 - Wait for queued tasks to end at worker node termination.
285 ## [3.1.1] - 2023-12-16
289 - Fix pool options TS type definition.
291 ## [3.1.0] - 2023-12-16
295 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
297 ## [3.0.14] - 2023-12-13
301 - Fix possible null exception with worker_threads pools.
303 ## [3.0.13] - 2023-12-12
307 - Ensure worker choice strategy wait for worker nodes readiness.
311 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
313 ## [3.0.12] - 2023-12-12
317 - Add infinite retries support in worker choice strategy.
319 ## [3.0.11] - 2023-12-11
323 - Ensure pool asynchronous resource properly track tasks execution.
325 ## [3.0.10] - 2023-12-08
329 - Add a fastpath when tasks stealing or redistribution is impossible.
331 ## [3.0.9] - 2023-11-26
335 - Remove all pool events listener at pool destroying.
336 - Remove all worker node events listener at worker node destroying.
337 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
339 ## [3.0.8] - 2023-11-25
343 - Ensure continuous tasks stealing on idle start at worker node idling.
345 ## [3.0.7] - 2023-11-24
349 - Make continuous tasks stealing start at worker node idling.
351 ## [3.0.6] - 2023-11-24
355 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
356 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
358 ## [3.0.5] - 2023-10-27
362 - Ensure pool `ready` event can be emitted only once.
364 ## [3.0.4] - 2023-10-20
368 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
369 - Use builtin retry mechanism in worker choice strategies instead of custom one.
371 ## [3.0.3] - 2023-10-19
375 - Avoid null exception at sending message to worker.
376 - Avoid null exception at checking worker node readiness.
378 ## [3.0.2] - 2023-10-17
382 - 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).
384 ## [3.0.1] - 2023-10-16
388 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
392 - Switch the worker node eventing code to `EventTarget` API.
394 ## [3.0.0] - 2023-10-08
398 - Remove Node.js 16.x.x (EOL) support.
400 ## [2.7.5] - 2023-10-03
404 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
406 ## [2.7.4] - 2023-09-25
410 - Fix source maps (bundler issue).
412 ## [2.7.3] - 2023-09-24
416 - Convert pool event emitter to event emitter async resource.
418 ## [2.7.2] - 2023-09-23
422 - Add source maps to npm package to ease debugging.
426 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
428 ## [2.7.1] - 2023-09-20
432 - Ensure worker message listener used one time are removed after usage.
434 ## [2.7.0] - 2023-09-19
438 - Fix task stealing related tasks queue options handling at runtime.
442 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
446 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
447 - Stricter worker constructor arguments validation.
449 ## [2.6.45] - 2023-09-17
453 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
457 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
458 - Add `start()` method to pool API to start the minimum number of workers.
459 - 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.
460 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
462 ## [2.6.44] - 2023-09-08
466 - Use a dedicated PAT to publish on GitHub packages registry.
470 - Publish on GitHub packages registry on release.
474 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
476 ## [2.6.43] - 2023-09-08
480 - Publish on GitHub packages registry on release.
484 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
486 ## [2.6.42] - 2023-09-06
490 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
492 ## [2.6.41] - 2023-09-03
496 - Optimize worker choice strategies implementation.
498 ## [2.6.40] - 2023-09-01
502 - Do not pre-choose in WRR worker choice strategy to avoid bias.
503 - Avoid array out of bound in worker choice strategies after worker node removal.
505 ## [2.6.39] - 2023-08-30
509 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
511 ## [2.6.38] - 2023-08-30
515 - Bundle typescript types declaration into one file.
519 - Improve interleaved weighted round robin worker choice strategy implementation.
521 ## [2.6.37] - 2023-08-28
525 - Ensure unused worker usage statistics are deleted at runtime.
529 - Rename worker choice strategy options `choiceRetries` to `retries`.
530 - Avoid unnecessary branching in worker choice strategies.
532 ## [2.6.36] - 2023-08-27
536 - Fix pool `execute()` arguments check.
540 - Make continuous tasks stealing algorithm less aggressive.
541 - Fine tune tasks stealing algorithm under back pressure.
543 ## [2.6.35] - 2023-08-25
547 - Don't account worker usage statistics for tasks that have failed.
548 - Fix pool information runtime and wait time median computation.
552 - Update simple moving average implementation to use a circular buffer.
553 - Update simple moving median implementation to use a circular buffer.
554 - Account for stolen tasks in worker usage statistics and pool information.
558 - Continuous tasks stealing algorithm.
560 ## [2.6.34] - 2023-08-24
564 - Avoid cascading tasks stealing under back pressure.
568 - Add fastpath to queued tasks rescheduling.
570 ## [2.6.33] - 2023-08-24
574 - Fix queued tasks rescheduling.
578 - Rename tasks queue options `queueMaxSize` to `size`.
582 - Task stealing scheduling algorithm if tasks queueing is enabled.
584 ## [2.6.32] - 2023-08-23
588 - Ensure no task can be executed when the pool is destroyed.
592 - Add `queueMaxSize` option to tasks queue options.
593 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
594 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
596 ## [2.6.31] - 2023-08-20
600 - Fix worker choice strategy retries mechanism in some edge cases.
604 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
605 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
607 ## [2.6.30] - 2023-08-19
611 - Ensure pool event `backPressure` is emitted.
612 - Ensure pool event `full` is emitted only once.
613 - Ensure worker node cannot be instantiated without proper arguments.
615 ## [2.6.29] - 2023-08-18
619 - Fix race condition between readiness and task functions worker message handling at startup.
620 - Fix duplicate task function worker usage statistics computation per task function.
621 - Update task function worker usage statistics if and only if there's at least two different task functions.
622 - Fix race condition at task function worker usage executing task computation leading to negative value.
626 - 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).
627 - Use back pressure detection in worker choice strategies.
628 - Add worker choice strategies retries mechanism if no worker is eligible.
630 ## [2.6.28] - 2023-08-16
634 - Ensure pool workers are properly initialized.
638 - HTTP server pool examples: express-cluster, express-hybrid.
642 - Remove now useless branching in worker hot code path.
644 ## [2.6.27] - 2023-08-15
648 - Add `KillHandler` type definition to exported types.
652 - Add `destroy` event to pool API.
654 ## [2.6.26] - 2023-08-15
658 - Add kill handler to worker options allowing to execute custom code when worker is killed.
659 - Add `listTaskFunctions()` method to pool API.
660 - SMTP client pool example: nodemailer.
662 ## [2.6.25] - 2023-08-13
666 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
667 - WebSocket server pool examples: ws-cluster, ws-hybrid.
669 ## [2.6.24] - 2023-08-12
673 - Add array of transferable objects to the `execute()` method arguments.
674 - WebSocket server pool examples: ws-worker_threads.
676 ## [2.6.23] - 2023-08-11
680 - 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.
684 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
685 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
687 ## [2.6.22] - 2023-08-10
691 - Add missing `types` field to package.json `exports`.
695 - Structure markdown documentation (PR #811).
697 ## [2.6.21] - 2023-08-03
701 - Improve code documentation.
702 - Code refactoring and cleanup for better maintainability and readability.
704 ## [2.6.20] - 2023-07-21
708 - Fix queued tasks redistribution on error task execution starvation.
709 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
713 - Drastically reduce lookups by worker in the worker nodes.
715 ## [2.6.19] - 2023-07-20
719 - Dedicated internal communication channel for worker_threads pools.
721 ## [2.6.18] - 2023-07-19
725 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
727 ## [2.6.17] - 2023-07-16
731 - Add `listTaskFunctions()` method to worker API.
733 ## [2.6.16] - 2023-07-12
737 - Fix pool startup detection.
738 - Fix worker task functions handling.
740 ## [2.6.15] - 2023-07-11
744 - Take into account worker node readiness in worker choice strategies.
746 ## [2.6.14] - 2023-07-10
750 - Fix task function statistics tracking.
752 ## [2.6.13] - 2023-07-10
756 - Add per task function statistics tracking.
757 - Add public methods to manipulate the worker task functions at runtime.
759 ## [2.6.12] - 2023-07-09
763 - Workaround import issue with `node:os` module in node 16.x.x.
765 ## [2.6.11] - 2023-07-09
769 - Fix pool readiness semantic.
771 ## [2.6.10] - 2023-07-08
775 - Ensure workers are not recreated on error at pool startup.
779 - Add `ready` and `strategy` fields to pool information.
780 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
781 - Add dynamic pool sizing checks.
783 ## [2.6.9] - 2023-07-07
787 - Recreate the right worker type on uncaught exception.
791 - Add minimum and maximum to internal measurement statistics.
792 - Add `runTime` and `waitTime` to pool information.
793 - Check worker inactive time only on dynamic worker.
795 ## [2.6.8] - 2023-07-03
799 - Brown paper bag release to fix version handling in pool information.
801 ## [2.6.7] - 2023-07-03
805 - Ensure worker queued tasks at error are reassigned to other pool workers.
809 - Add pool `utilization` ratio to pool information.
810 - Add `version` to pool information.
811 - Add worker information to worker nodes.
813 ## [2.6.6] - 2023-07-01
817 - Add safe helper `availableParallelism()` to help sizing the pool.
821 - Ensure message handler is only registered in worker.
823 ## [2.6.5] - 2023-06-27
827 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
831 - Artificial version bump to 2.6.5 to workaround publication issue.
832 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
833 - Ensure pool event is emitted before task error promise rejection.
834 - Fix queued tasks count computation.
838 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
840 ## [2.6.4] - 2023-06-27
844 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
848 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
849 - Ensure pool event is emitted before task error promise rejection.
850 - Fix queued tasks count computation.
854 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
856 ## [2.6.3] - 2023-06-19
860 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
861 - Update strategies internals after statistics computation.
865 - Optimize O(1) queue implementation.
867 ## [2.6.2] - 2023-06-12
871 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
873 ## [2.6.1] - 2023-06-10
877 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
881 - Fix average statistics computation: ensure failed tasks are not accounted.
883 ## [2.6.0] - 2023-06-09
887 - Add `LEAST_ELU` worker choice strategy (experimental).
888 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
892 - Refactor pool worker node usage internals.
893 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
894 - Breaking change: pool information `info` property object fields have been renamed.
898 - Fix wait time accounting.
899 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
900 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
902 ## [2.5.4] - 2023-06-07
906 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
910 - Compute statistics at the worker level only if needed.
911 - Add `worker_threads` options to thread pool options.
915 - Make the `LEAST_BUSY` strategy only relies on task runtime.
917 ## [2.5.3] - 2023-06-04
921 - Refine pool information content.
922 - Limit pool internals public exposure.
924 ## [2.5.2] - 2023-06-02
928 - Add `taskError` pool event for task execution error.
929 - Add pool information `info` property to pool.
930 - Emit pool information on `busy` and `full` pool events.
932 ## [2.5.1] - 2023-06-01
936 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
937 - Add `error` pool event for uncaught worker error.
939 ## [2.5.0] - 2023-05-31
943 - Switch pool event emitter to `EventEmitterAsyncResource`.
944 - Add tasks wait time accounting in per worker tasks usage.
945 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
949 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
951 ## [2.4.14] - 2023-05-09
955 - Ensure no undefined task runtime can land in the tasks history.
956 - Fix median computation implementation once again.
960 - Unit tests for median and queue implementations.
962 ## [2.4.13] - 2023-05-08
966 - Fix worker choice strategy options validation.
967 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
969 ## [2.4.12] - 2023-05-06
973 - Support multiple task functions per worker.
974 - Add custom worker weights support to worker choice strategies options.
978 - Use O(1) queue implementation for tasks queueing.
982 - Fix median computation implementation.
983 - Fix fair share worker choice strategy internals update.
985 ## [2.4.11] - 2023-04-23
989 - Optimize free worker finding in worker choice strategies.
991 ## [2.4.10] - 2023-04-15
995 - Fix typescript type definition for task function: ensure the input data is optional.
996 - Fix typescript type definition for pool execute(): ensure the input data is optional.
998 ## [2.4.9] - 2023-04-15
1002 - Add tasks queue enablement runtime setter to pool.
1003 - Add tasks queue options runtime setter to pool.
1004 - Add worker choice strategy options runtime setter to pool.
1008 - Remove the tasks queuing experimental status.
1012 - Fix task function type definition and validation.
1013 - Fix worker choice strategy options handling.
1015 ## [2.4.8] - 2023-04-12
1019 - Fix message between main worker and worker type definition for tasks.
1020 - Fix code documentation.
1022 ## [2.4.7] - 2023-04-11
1026 - Add worker tasks queue options to pool options.
1030 - Fix missing documentation.
1032 ## [2.4.6] - 2023-04-10
1036 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1037 - Properly count worker executing tasks with tasks queueing enabled.
1039 ## [2.4.5] - 2023-04-09
1043 - Use monotonic high resolution timer for worker tasks runtime.
1044 - Add worker tasks median runtime to statistics.
1045 - Add worker tasks queue (experimental).
1047 ## [2.4.4] - 2023-04-07
1051 - Add `PoolEvents` enumeration and `PoolEvent` type.
1055 - Destroy worker only on alive check.
1057 ## [2.4.3] - 2023-04-07
1061 - Fix typedoc generation with inheritance.
1063 ## [2.4.2] - 2023-04-06
1067 - Add `full` event to dynamic pool.
1068 - Keep worker choice strategy in memory for conditional reuse.
1072 - Fix possible negative worker key at worker removal in worker choice strategies.
1074 ## [2.4.1] - 2023-04-05
1078 - Optimize worker choice strategy for dynamic pool.
1082 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1084 ## [2.4.0] - 2023-04-04
1088 - Add `LESS_BUSY` worker choice strategy.
1092 - Optimize worker storage in pool.
1093 - Optimize worker alive status check.
1094 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1095 - Optimize `LESS_USED` worker choice strategy.
1096 - Update benchmark versus external threads pools.
1097 - Optimize tasks usage statistics requirements for 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.
1104 - Fix package publication with pnpm.
1106 ## [2.4.0-3] - 2023-04-04
1110 - Add `LESS_BUSY` worker choice strategy.
1114 - Optimize worker storage in pool.
1115 - Optimize worker alive status check.
1116 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1117 - Optimize `LESS_USED` worker choice strategy.
1118 - Update benchmark versus external threads pools.
1122 - Ensure trimmable characters are checked at pool initialization.
1123 - Fix message id integer overflow.
1124 - Fix pool worker removal in worker choice strategy internals.
1125 - Fix package publication with pnpm.
1127 ## [2.4.0-2] - 2023-04-03
1131 - Add `LESS_BUSY` worker choice strategy.
1135 - Optimize worker storage in pool.
1136 - Optimize worker alive status check.
1137 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1138 - Optimize `LESS_USED` worker choice strategy.
1142 - Ensure trimmable characters are checked at pool initialization.
1143 - Fix message id integer overflow.
1144 - Fix pool worker removal in worker choice strategy internals.
1145 - Fix package publication with pnpm.
1147 ## [2.4.0-1] - 2023-04-03
1151 - Add `LESS_BUSY` worker choice strategy.
1155 - Optimize worker storage in pool.
1156 - Optimize worker alive status check.
1157 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1158 - Optimize `LESS_USED` worker choice strategy.
1162 - Ensure trimmable characters are checked at pool initialization.
1163 - Fix message id integer overflow.
1164 - Fix pool worker removal in worker choice strategy internals.
1166 ## [2.4.0-0] - 2023-04-03
1170 - Add `LESS_BUSY` worker choice strategy.
1174 - Optimize worker storage in pool.
1175 - Optimize worker alive status check.
1176 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1177 - Optimize `LESS_USED` worker choice strategy.
1181 - Ensure trimmable characters are checked at pool initialization.
1182 - Fix message id integer overflow.
1183 - Fix pool worker removal in worker choice strategy internals.
1185 ## [2.3.10] - 2023-03-18
1189 - Fix package.json `exports` syntax for ESM and CommonJS.
1193 - Permit SemVer pre-release publication.
1195 ## [2.3.10-2] - 2023-03-18
1199 - Fix package.json `exports` syntax for ESM and CommonJS.
1201 ## [2.3.10-1] - 2023-03-18
1205 - Permit SemVer pre-release publication.
1207 ## [2.3.10-0] - 2023-03-18
1211 - Fix package.json `exports` syntax for ESM and CommonJS.
1213 ## [2.3.9] - 2023-03-18
1217 - Introduce ESM module support along with CommonJS one.
1221 - Fix brown paper bag bug referencing the same object literal.
1223 ## [2.3.8] - 2023-03-18
1227 - Switch internal benchmarking code to benny.
1228 - Switch to TypeScript 5.x.x.
1229 - Switch rollup bundler plugins to core ones.
1230 - Switch to TSDoc syntax.
1231 - Enforce conventional commits.
1235 - Fix random integer generator.
1236 - Fix worker choice strategy pool type identification at initialization.
1238 ## [2.3.7] - 2022-10-23
1242 - Switch to open collective FOSS project funding platform.
1243 - Switch to ts-standard linter configuration on TypeScript code.
1247 - Fixed missing async on pool execute method.
1248 - Fixed typing in TypeScript example.
1249 - Fixed types in unit tests.
1251 ## [2.3.6] - 2022-10-22
1255 - Cleanup pool attributes and methods.
1256 - Refine error types thrown.
1260 - Fix continuous integration build on windows.
1261 - Fix code coverage reporting by using c8 instead of nyc.
1263 ## [2.3.5] - 2022-10-21
1267 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1268 - Optimize tasks usage lookup implementation.
1272 - Fix missed pool event emitter type export.
1273 - Fix typedoc documentation generation.
1275 ## [2.3.4] - 2022-10-17
1279 - Fully automate release process with release-it.
1283 - Optimize fair share task scheduling algorithm implementation.
1284 - Update benchmark versus external pools results with latest version.
1286 ## [2.3.3] - 2022-10-15
1290 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1292 ## [2.3.2] - 2022-10-14
1296 - Optimize fair share worker selection strategy implementation.
1300 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1302 ## [2.3.1] - 2022-10-13
1306 - Pool worker choice strategies:
1307 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1308 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1310 ## [2.2.2] - 2022-10-09
1314 - Fixed `README.md` file.
1316 ## [2.2.1] - 2022-10-08
1320 - Dynamic worker choice strategy change at runtime.
1322 ## [2.2.0] - 2022-01-05
1324 ### Breaking Changes
1326 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1328 ## [2.1.0] - 2021-08-29
1332 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1334 ### Breaking Changes
1336 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1337 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1338 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1339 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1341 ## [2.0.2] - 2021-05-12
1345 - Fix `busy` event emission on fixed pool type
1347 ## [2.0.1] - 2021-03-16
1351 - Check if pool options are properly set.
1352 - `busy` event is emitted on all pool types.
1354 ## [2.0.0] - 2021-03-01
1358 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1360 ### Breaking Changes
1362 - `FullPool` event is now renamed to `busy`.
1363 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1364 _Find more details on our JSDoc._
1366 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1368 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1370 ### Pool options types declaration merge
1372 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1374 #### New `export` strategy
1378 const DynamicThreadPool = require('poolifier/lib/dynamic')
1380 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1383 But you should always prefer just using
1386 const { DynamicThreadPool } = require('poolifier')
1389 #### New type definitions for input data and response
1391 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1392 _This is not a limitation by poolifier but Node.js._
1394 #### Public property replacements
1396 `numWorkers` property is now `numberOfWorkers`
1398 #### Internal (protected) properties and methods renaming
1400 These properties are not intended for end users
1402 - `id` => `nextMessageId`
1404 These methods are not intended for end users
1406 - `_chooseWorker` => `chooseWorker`
1407 - `_newWorker` => `createWorker`
1408 - `_execute` => `internalExecute`
1409 - `_chooseWorker` => `chooseWorker`
1410 - `_checkAlive` => `checkAlive`
1412 - `_runAsync` => `runAsync`
1414 ## [1.1.0] - 2020-05-21
1418 - ThreadWorker support async functions as option
1419 - Various external library patches
1421 ## [1.0.0] - 2020-01-24
1425 - FixedThreadPool implementation
1426 - DynamicThreadPool implementation
1427 - WorkerThread implementation to improve developer experience