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 - Add ELU statistics to pool information.
14 ## [4.0.6] - 2024-05-10
18 - Fix pools' `addTaskFunction()` type definition.
20 ## [4.0.5] - 2024-05-09
24 - Avoid queued tasks redistribution on the errored worker node.
26 ## [4.0.4] - 2024-05-08
30 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
32 ## [4.0.3] - 2024-05-08
36 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
38 ## [4.0.2] - 2024-05-06
42 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
44 ## [4.0.1] - 2024-05-02
48 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
49 - 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.
51 ## [4.0.0] - 2024-04-30
55 - 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 }`.
56 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
57 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
58 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
62 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
64 ## [3.1.30] - 2024-04-22
68 - Fix `transferList` argument type definition.
70 ## [3.1.29] - 2024-04-02
74 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
76 ## [3.1.28] - 2024-04-01
80 - Ensure the minimum number of workers on a started pool is guaranteed.
82 ## [3.1.27] - 2024-03-27
86 - Fix publishing on JSR, take 4.
88 ## [3.1.26] - 2024-03-27
92 - Fix publishing on JSR, take 3.
94 ## [3.1.25] - 2024-03-27
98 - Fix publishing on JSR, take 2.
100 ## [3.1.24] - 2024-03-27
104 - Fix publishing on JSR.
106 ## [3.1.23] - 2024-03-27
112 ## [3.1.22] - 2024-03-15
116 - Fix pool event emitter registered callbacks removal at `destroy()`.
118 ## [3.1.21] - 2024-02-22
122 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
124 ## [3.1.20] - 2024-02-11
128 - Ensure `worker_threads` workers are unreferenced at termination.
130 ## [3.1.19] - 2024-01-16
134 - Fix possible null exception at task finishing handling.
138 - Optimize Deque implementation to improve tasks queueing performance.
140 ## [3.1.18] - 2024-01-06
144 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
146 ## [3.1.17] - 2024-01-05
150 - Improve performance by clean up unneeded condition checks on hot code paths.
152 ## [3.1.16] - 2024-01-03
156 - Add missing type to TS type definitions.
158 ## [3.1.15] - 2024-01-02
162 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
164 ## [3.1.15-0] - 2024-01-02
168 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
170 ## [3.1.14] - 2024-01-01
174 - Properly handle dynamic pool with zero minimum size.
176 ## [3.1.13] - 2023-12-30
180 - Reduce branching in several hot code paths.
181 - Use faster object cloning implementation.
183 ## [3.1.12] - 2023-12-27
187 - Fix tasks redistribution triggers at pool destroying.
191 - Switch TypeScript module resolution to Node16.
193 ## [3.1.12-0] - 2023-12-27
197 - Fix tasks redistribution triggers at pool destroying.
199 ## [3.1.11] - 2023-12-24
203 - Avoid worker node cross tasks stealing.
204 - Ensure only half the pool worker nodes can steal tasks.
206 ## [3.1.10] - 2023-12-23
210 - Avoid useless branching on pool type.
212 ## [3.1.9] - 2023-12-22
216 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
218 ## [3.1.8] - 2023-12-21
222 - Fix default worker weight computation.
223 - Fix possible null exception at pool destroying.
225 ## [3.1.7] - 2023-12-20
229 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
231 ## [3.1.6] - 2023-12-18
235 - Fix pool destroying with tasks queuing enabled.
237 ## [3.1.5] - 2023-12-18
241 - Add queued tasks end timeout support to worker node termination.
243 ## [3.1.4] - 2023-12-18
247 - Make more robust the fix for possible null exception at handling task execution response.
249 ## [3.1.3] - 2023-12-17
253 - Fix possible null exception at handling task execution response.
255 ## [3.1.2] - 2023-12-17
259 - Wait for queued tasks to end at worker node termination.
261 ## [3.1.1] - 2023-12-16
265 - Fix pool options TS type definition.
267 ## [3.1.0] - 2023-12-16
271 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
273 ## [3.0.14] - 2023-12-13
277 - Fix possible null exception with worker_threads pools.
279 ## [3.0.13] - 2023-12-12
283 - Ensure worker choice strategy wait for worker nodes readiness.
287 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
289 ## [3.0.12] - 2023-12-12
293 - Add infinite retries support in worker choice strategy.
295 ## [3.0.11] - 2023-12-11
299 - Ensure pool asynchronous resource properly track tasks execution.
301 ## [3.0.10] - 2023-12-08
305 - Add a fastpath when tasks stealing or redistribution is impossible.
307 ## [3.0.9] - 2023-11-26
311 - Remove all pool events listener at pool destroying.
312 - Remove all worker node events listener at worker node destroying.
313 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
315 ## [3.0.8] - 2023-11-25
319 - Ensure continuous tasks stealing on idle start at worker node idling.
321 ## [3.0.7] - 2023-11-24
325 - Make continuous tasks stealing start at worker node idling.
327 ## [3.0.6] - 2023-11-24
331 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
332 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
334 ## [3.0.5] - 2023-10-27
338 - Ensure pool `ready` event can be emitted only once.
340 ## [3.0.4] - 2023-10-20
344 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
345 - Use builtin retry mechanism in worker choice strategies instead of custom one.
347 ## [3.0.3] - 2023-10-19
351 - Avoid null exception at sending message to worker.
352 - Avoid null exception at checking worker node readiness.
354 ## [3.0.2] - 2023-10-17
358 - 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).
360 ## [3.0.1] - 2023-10-16
364 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
368 - Switch the worker node eventing code to `EventTarget` API.
370 ## [3.0.0] - 2023-10-08
374 - Remove Node.js 16.x.x (EOL) support.
376 ## [2.7.5] - 2023-10-03
380 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
382 ## [2.7.4] - 2023-09-25
386 - Fix source maps (bundler issue).
388 ## [2.7.3] - 2023-09-24
392 - Convert pool event emitter to event emitter async resource.
394 ## [2.7.2] - 2023-09-23
398 - Add source maps to npm package to ease debugging.
402 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
404 ## [2.7.1] - 2023-09-20
408 - Ensure worker message listener used one time are removed after usage.
410 ## [2.7.0] - 2023-09-19
414 - Fix task stealing related tasks queue options handling at runtime.
418 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
422 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
423 - Stricter worker constructor arguments validation.
425 ## [2.6.45] - 2023-09-17
429 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
433 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
434 - Add `start()` method to pool API to start the minimum number of workers.
435 - 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.
436 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
438 ## [2.6.44] - 2023-09-08
442 - Use a dedicated PAT to publish on GitHub packages registry.
446 - Publish on GitHub packages registry on release.
450 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
452 ## [2.6.43] - 2023-09-08
456 - Publish on GitHub packages registry on release.
460 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
462 ## [2.6.42] - 2023-09-06
466 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
468 ## [2.6.41] - 2023-09-03
472 - Optimize worker choice strategies implementation.
474 ## [2.6.40] - 2023-09-01
478 - Do not pre-choose in WRR worker choice strategy to avoid bias.
479 - Avoid array out of bound in worker choice strategies after worker node removal.
481 ## [2.6.39] - 2023-08-30
485 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
487 ## [2.6.38] - 2023-08-30
491 - Bundle typescript types declaration into one file.
495 - Improve interleaved weighted round robin worker choice strategy implementation.
497 ## [2.6.37] - 2023-08-28
501 - Ensure unused worker usage statistics are deleted at runtime.
505 - Rename worker choice strategy options `choiceRetries` to `retries`.
506 - Avoid unnecessary branching in worker choice strategies.
508 ## [2.6.36] - 2023-08-27
512 - Fix pool `execute()` arguments check.
516 - Make continuous tasks stealing algorithm less aggressive.
517 - Fine tune tasks stealing algorithm under back pressure.
519 ## [2.6.35] - 2023-08-25
523 - Don't account worker usage statistics for tasks that have failed.
524 - Fix pool information runtime and wait time median computation.
528 - Update simple moving average implementation to use a circular buffer.
529 - Update simple moving median implementation to use a circular buffer.
530 - Account for stolen tasks in worker usage statistics and pool information.
534 - Continuous tasks stealing algorithm.
536 ## [2.6.34] - 2023-08-24
540 - Avoid cascading tasks stealing under back pressure.
544 - Add fastpath to queued tasks rescheduling.
546 ## [2.6.33] - 2023-08-24
550 - Fix queued tasks rescheduling.
554 - Rename tasks queue options `queueMaxSize` to `size`.
558 - Task stealing scheduling algorithm if tasks queueing is enabled.
560 ## [2.6.32] - 2023-08-23
564 - Ensure no task can be executed when the pool is destroyed.
568 - Add `queueMaxSize` option to tasks queue options.
569 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
570 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
572 ## [2.6.31] - 2023-08-20
576 - Fix worker choice strategy retries mechanism in some edge cases.
580 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
581 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
583 ## [2.6.30] - 2023-08-19
587 - Ensure pool event `backPressure` is emitted.
588 - Ensure pool event `full` is emitted only once.
589 - Ensure worker node cannot be instantiated without proper arguments.
591 ## [2.6.29] - 2023-08-18
595 - Fix race condition between readiness and task functions worker message handling at startup.
596 - Fix duplicate task function worker usage statistics computation per task function.
597 - Update task function worker usage statistics if and only if there's at least two different task functions.
598 - Fix race condition at task function worker usage executing task computation leading to negative value.
602 - 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).
603 - Use back pressure detection in worker choice strategies.
604 - Add worker choice strategies retries mechanism if no worker is eligible.
606 ## [2.6.28] - 2023-08-16
610 - Ensure pool workers are properly initialized.
614 - HTTP server pool examples: express-cluster, express-hybrid.
618 - Remove now useless branching in worker hot code path.
620 ## [2.6.27] - 2023-08-15
624 - Add `KillHandler` type definition to exported types.
628 - Add `destroy` event to pool API.
630 ## [2.6.26] - 2023-08-15
634 - Add kill handler to worker options allowing to execute custom code when worker is killed.
635 - Add `listTaskFunctions()` method to pool API.
636 - SMTP client pool example: nodemailer.
638 ## [2.6.25] - 2023-08-13
642 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
643 - WebSocket server pool examples: ws-cluster, ws-hybrid.
645 ## [2.6.24] - 2023-08-12
649 - Add array of transferable objects to the `execute()` method arguments.
650 - WebSocket server pool examples: ws-worker_threads.
652 ## [2.6.23] - 2023-08-11
656 - 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.
660 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
661 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
663 ## [2.6.22] - 2023-08-10
667 - Add missing `types` field to package.json `exports`.
671 - Structure markdown documentation (PR #811).
673 ## [2.6.21] - 2023-08-03
677 - Improve code documentation.
678 - Code refactoring and cleanup for better maintainability and readability.
680 ## [2.6.20] - 2023-07-21
684 - Fix queued tasks redistribution on error task execution starvation.
685 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
689 - Drastically reduce lookups by worker in the worker nodes.
691 ## [2.6.19] - 2023-07-20
695 - Dedicated internal communication channel for worker_threads pools.
697 ## [2.6.18] - 2023-07-19
701 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
703 ## [2.6.17] - 2023-07-16
707 - Add `listTaskFunctions()` method to worker API.
709 ## [2.6.16] - 2023-07-12
713 - Fix pool startup detection.
714 - Fix worker task functions handling.
716 ## [2.6.15] - 2023-07-11
720 - Take into account worker node readiness in worker choice strategies.
722 ## [2.6.14] - 2023-07-10
726 - Fix task function statistics tracking.
728 ## [2.6.13] - 2023-07-10
732 - Add per task function statistics tracking.
733 - Add public methods to manipulate the worker task functions at runtime.
735 ## [2.6.12] - 2023-07-09
739 - Workaround import issue with `node:os` module in node 16.x.x.
741 ## [2.6.11] - 2023-07-09
745 - Fix pool readiness semantic.
747 ## [2.6.10] - 2023-07-08
751 - Ensure workers are not recreated on error at pool startup.
755 - Add `ready` and `strategy` fields to pool information.
756 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
757 - Add dynamic pool sizing checks.
759 ## [2.6.9] - 2023-07-07
763 - Recreate the right worker type on uncaught exception.
767 - Add minimum and maximum to internal measurement statistics.
768 - Add `runTime` and `waitTime` to pool information.
769 - Check worker inactive time only on dynamic worker.
771 ## [2.6.8] - 2023-07-03
775 - Brown paper bag release to fix version handling in pool information.
777 ## [2.6.7] - 2023-07-03
781 - Ensure worker queued tasks at error are reassigned to other pool workers.
785 - Add pool `utilization` ratio to pool information.
786 - Add `version` to pool information.
787 - Add worker information to worker nodes.
789 ## [2.6.6] - 2023-07-01
793 - Add safe helper `availableParallelism()` to help sizing the pool.
797 - Ensure message handler is only registered in worker.
799 ## [2.6.5] - 2023-06-27
803 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
807 - Artificial version bump to 2.6.5 to workaround publication issue.
808 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
809 - Ensure pool event is emitted before task error promise rejection.
810 - Fix queued tasks count computation.
814 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
816 ## [2.6.4] - 2023-06-27
820 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
824 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
825 - Ensure pool event is emitted before task error promise rejection.
826 - Fix queued tasks count computation.
830 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
832 ## [2.6.3] - 2023-06-19
836 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
837 - Update strategies internals after statistics computation.
841 - Optimize O(1) queue implementation.
843 ## [2.6.2] - 2023-06-12
847 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
849 ## [2.6.1] - 2023-06-10
853 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
857 - Fix average statistics computation: ensure failed tasks are not accounted.
859 ## [2.6.0] - 2023-06-09
863 - Add `LEAST_ELU` worker choice strategy (experimental).
864 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
868 - Refactor pool worker node usage internals.
869 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
870 - Breaking change: pool information `info` property object fields have been renamed.
874 - Fix wait time accounting.
875 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
876 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
878 ## [2.5.4] - 2023-06-07
882 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
886 - Compute statistics at the worker level only if needed.
887 - Add `worker_threads` options to thread pool options.
891 - Make the `LEAST_BUSY` strategy only relies on task runtime.
893 ## [2.5.3] - 2023-06-04
897 - Refine pool information content.
898 - Limit pool internals public exposure.
900 ## [2.5.2] - 2023-06-02
904 - Add `taskError` pool event for task execution error.
905 - Add pool information `info` property to pool.
906 - Emit pool information on `busy` and `full` pool events.
908 ## [2.5.1] - 2023-06-01
912 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
913 - Add `error` pool event for uncaught worker error.
915 ## [2.5.0] - 2023-05-31
919 - Switch pool event emitter to `EventEmitterAsyncResource`.
920 - Add tasks wait time accounting in per worker tasks usage.
921 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
925 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
927 ## [2.4.14] - 2023-05-09
931 - Ensure no undefined task runtime can land in the tasks history.
932 - Fix median computation implementation once again.
936 - Unit tests for median and queue implementations.
938 ## [2.4.13] - 2023-05-08
942 - Fix worker choice strategy options validation.
943 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
945 ## [2.4.12] - 2023-05-06
949 - Support multiple task functions per worker.
950 - Add custom worker weights support to worker choice strategies options.
954 - Use O(1) queue implementation for tasks queueing.
958 - Fix median computation implementation.
959 - Fix fair share worker choice strategy internals update.
961 ## [2.4.11] - 2023-04-23
965 - Optimize free worker finding in worker choice strategies.
967 ## [2.4.10] - 2023-04-15
971 - Fix typescript type definition for task function: ensure the input data is optional.
972 - Fix typescript type definition for pool execute(): ensure the input data is optional.
974 ## [2.4.9] - 2023-04-15
978 - Add tasks queue enablement runtime setter to pool.
979 - Add tasks queue options runtime setter to pool.
980 - Add worker choice strategy options runtime setter to pool.
984 - Remove the tasks queuing experimental status.
988 - Fix task function type definition and validation.
989 - Fix worker choice strategy options handling.
991 ## [2.4.8] - 2023-04-12
995 - Fix message between main worker and worker type definition for tasks.
996 - Fix code documentation.
998 ## [2.4.7] - 2023-04-11
1002 - Add worker tasks queue options to pool options.
1006 - Fix missing documentation.
1008 ## [2.4.6] - 2023-04-10
1012 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1013 - Properly count worker executing tasks with tasks queueing enabled.
1015 ## [2.4.5] - 2023-04-09
1019 - Use monotonic high resolution timer for worker tasks runtime.
1020 - Add worker tasks median runtime to statistics.
1021 - Add worker tasks queue (experimental).
1023 ## [2.4.4] - 2023-04-07
1027 - Add `PoolEvents` enumeration and `PoolEvent` type.
1031 - Destroy worker only on alive check.
1033 ## [2.4.3] - 2023-04-07
1037 - Fix typedoc generation with inheritance.
1039 ## [2.4.2] - 2023-04-06
1043 - Add `full` event to dynamic pool.
1044 - Keep worker choice strategy in memory for conditional reuse.
1048 - Fix possible negative worker key at worker removal in worker choice strategies.
1050 ## [2.4.1] - 2023-04-05
1054 - Optimize worker choice strategy for dynamic pool.
1058 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1060 ## [2.4.0] - 2023-04-04
1064 - Add `LESS_BUSY` worker choice strategy.
1068 - Optimize worker storage in pool.
1069 - Optimize worker alive status check.
1070 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1071 - Optimize `LESS_USED` worker choice strategy.
1072 - Update benchmark versus external threads pools.
1073 - Optimize tasks usage statistics requirements for worker choice strategy.
1077 - Ensure trimmable characters are checked at pool initialization.
1078 - Fix message id integer overflow.
1079 - Fix pool worker removal in worker choice strategy internals.
1080 - Fix package publication with pnpm.
1082 ## [2.4.0-3] - 2023-04-04
1086 - Add `LESS_BUSY` worker choice strategy.
1090 - Optimize worker storage in pool.
1091 - Optimize worker alive status check.
1092 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1093 - Optimize `LESS_USED` worker choice strategy.
1094 - Update benchmark versus external threads pools.
1098 - Ensure trimmable characters are checked at pool initialization.
1099 - Fix message id integer overflow.
1100 - Fix pool worker removal in worker choice strategy internals.
1101 - Fix package publication with pnpm.
1103 ## [2.4.0-2] - 2023-04-03
1107 - Add `LESS_BUSY` worker choice strategy.
1111 - Optimize worker storage in pool.
1112 - Optimize worker alive status check.
1113 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1114 - Optimize `LESS_USED` worker choice strategy.
1118 - Ensure trimmable characters are checked at pool initialization.
1119 - Fix message id integer overflow.
1120 - Fix pool worker removal in worker choice strategy internals.
1121 - Fix package publication with pnpm.
1123 ## [2.4.0-1] - 2023-04-03
1127 - Add `LESS_BUSY` worker choice strategy.
1131 - Optimize worker storage in pool.
1132 - Optimize worker alive status check.
1133 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1134 - Optimize `LESS_USED` worker choice strategy.
1138 - Ensure trimmable characters are checked at pool initialization.
1139 - Fix message id integer overflow.
1140 - Fix pool worker removal in worker choice strategy internals.
1142 ## [2.4.0-0] - 2023-04-03
1146 - Add `LESS_BUSY` worker choice strategy.
1150 - Optimize worker storage in pool.
1151 - Optimize worker alive status check.
1152 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1153 - Optimize `LESS_USED` worker choice strategy.
1157 - Ensure trimmable characters are checked at pool initialization.
1158 - Fix message id integer overflow.
1159 - Fix pool worker removal in worker choice strategy internals.
1161 ## [2.3.10] - 2023-03-18
1165 - Fix package.json `exports` syntax for ESM and CommonJS.
1169 - Permit SemVer pre-release publication.
1171 ## [2.3.10-2] - 2023-03-18
1175 - Fix package.json `exports` syntax for ESM and CommonJS.
1177 ## [2.3.10-1] - 2023-03-18
1181 - Permit SemVer pre-release publication.
1183 ## [2.3.10-0] - 2023-03-18
1187 - Fix package.json `exports` syntax for ESM and CommonJS.
1189 ## [2.3.9] - 2023-03-18
1193 - Introduce ESM module support along with CommonJS one.
1197 - Fix brown paper bag bug referencing the same object literal.
1199 ## [2.3.8] - 2023-03-18
1203 - Switch internal benchmarking code to benny.
1204 - Switch to TypeScript 5.x.x.
1205 - Switch rollup bundler plugins to core ones.
1206 - Switch to TSDoc syntax.
1207 - Enforce conventional commits.
1211 - Fix random integer generator.
1212 - Fix worker choice strategy pool type identification at initialization.
1214 ## [2.3.7] - 2022-10-23
1218 - Switch to open collective FOSS project funding platform.
1219 - Switch to ts-standard linter configuration on TypeScript code.
1223 - Fixed missing async on pool execute method.
1224 - Fixed typing in TypeScript example.
1225 - Fixed types in unit tests.
1227 ## [2.3.6] - 2022-10-22
1231 - Cleanup pool attributes and methods.
1232 - Refine error types thrown.
1236 - Fix continuous integration build on windows.
1237 - Fix code coverage reporting by using c8 instead of nyc.
1239 ## [2.3.5] - 2022-10-21
1243 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1244 - Optimize tasks usage lookup implementation.
1248 - Fix missed pool event emitter type export.
1249 - Fix typedoc documentation generation.
1251 ## [2.3.4] - 2022-10-17
1255 - Fully automate release process with release-it.
1259 - Optimize fair share task scheduling algorithm implementation.
1260 - Update benchmark versus external pools results with latest version.
1262 ## [2.3.3] - 2022-10-15
1266 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1268 ## [2.3.2] - 2022-10-14
1272 - Optimize fair share worker selection strategy implementation.
1276 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1278 ## [2.3.1] - 2022-10-13
1282 - Pool worker choice strategies:
1283 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1284 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1286 ## [2.2.2] - 2022-10-09
1290 - Fixed `README.md` file.
1292 ## [2.2.1] - 2022-10-08
1296 - Dynamic worker choice strategy change at runtime.
1298 ## [2.2.0] - 2022-01-05
1300 ### Breaking Changes
1302 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1304 ## [2.1.0] - 2021-08-29
1308 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1310 ### Breaking Changes
1312 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1313 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1314 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1315 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1317 ## [2.0.2] - 2021-05-12
1321 - Fix `busy` event emission on fixed pool type
1323 ## [2.0.1] - 2021-03-16
1327 - Check if pool options are properly set.
1328 - `busy` event is emitted on all pool types.
1330 ## [2.0.0] - 2021-03-01
1334 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1336 ### Breaking Changes
1338 - `FullPool` event is now renamed to `busy`.
1339 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1340 _Find more details on our JSDoc._
1342 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1344 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1346 ### Pool options types declaration merge
1348 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1350 #### New `export` strategy
1354 const DynamicThreadPool = require('poolifier/lib/dynamic')
1356 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1359 But you should always prefer just using
1362 const { DynamicThreadPool } = require('poolifier')
1365 #### New type definitions for input data and response
1367 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1368 _This is not a limitation by poolifier but Node.js._
1370 #### Public property replacements
1372 `numWorkers` property is now `numberOfWorkers`
1374 #### Internal (protected) properties and methods renaming
1376 These properties are not intended for end users
1378 - `id` => `nextMessageId`
1380 These methods are not intended for end users
1382 - `_chooseWorker` => `chooseWorker`
1383 - `_newWorker` => `createWorker`
1384 - `_execute` => `internalExecute`
1385 - `_chooseWorker` => `chooseWorker`
1386 - `_checkAlive` => `checkAlive`
1388 - `_runAsync` => `runAsync`
1390 ## [1.1.0] - 2020-05-21
1394 - ThreadWorker support async functions as option
1395 - Various external library patches
1397 ## [1.0.0] - 2020-01-24
1401 - FixedThreadPool implementation
1402 - DynamicThreadPool implementation
1403 - WorkerThread implementation to improve developer experience