3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
10 ## [4.0.11] - 2024-05-21
14 - Switch to optimized circular buffer implementation to store task execution measurements.
16 ## [4.0.10] - 2024-05-20
20 - Ensure tasks stealing dynamic worker node is not destroyed on inactivity.
22 ## [4.0.9] - 2024-05-19
26 - Add ELU `utilization` statistics to pool information.
28 ## [4.0.8] - 2024-05-15
32 - Fix default task function worker choice strategy and priority handling.
34 ## [4.0.7] - 2024-05-13
38 - Add ELU statistics to pool information.
40 ## [4.0.6] - 2024-05-10
44 - Fix pools' `addTaskFunction()` type definition.
46 ## [4.0.5] - 2024-05-09
50 - Avoid queued tasks redistribution on the errored worker node.
52 ## [4.0.4] - 2024-05-08
56 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
58 ## [4.0.3] - 2024-05-08
62 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
64 ## [4.0.2] - 2024-05-06
68 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
70 ## [4.0.1] - 2024-05-02
74 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
75 - 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.
77 ## [4.0.0] - 2024-04-30
81 - 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 }`.
82 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
83 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
84 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
88 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
90 ## [3.1.30] - 2024-04-22
94 - Fix `transferList` argument type definition.
96 ## [3.1.29] - 2024-04-02
100 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
102 ## [3.1.28] - 2024-04-01
106 - Ensure the minimum number of workers on a started pool is guaranteed.
108 ## [3.1.27] - 2024-03-27
112 - Fix publishing on JSR, take 4.
114 ## [3.1.26] - 2024-03-27
118 - Fix publishing on JSR, take 3.
120 ## [3.1.25] - 2024-03-27
124 - Fix publishing on JSR, take 2.
126 ## [3.1.24] - 2024-03-27
130 - Fix publishing on JSR.
132 ## [3.1.23] - 2024-03-27
138 ## [3.1.22] - 2024-03-15
142 - Fix pool event emitter registered callbacks removal at `destroy()`.
144 ## [3.1.21] - 2024-02-22
148 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
150 ## [3.1.20] - 2024-02-11
154 - Ensure `worker_threads` workers are unreferenced at termination.
156 ## [3.1.19] - 2024-01-16
160 - Fix possible null exception at task finishing handling.
164 - Optimize Deque implementation to improve tasks queueing performance.
166 ## [3.1.18] - 2024-01-06
170 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
172 ## [3.1.17] - 2024-01-05
176 - Improve performance by clean up unneeded condition checks on hot code paths.
178 ## [3.1.16] - 2024-01-03
182 - Add missing type to TS type definitions.
184 ## [3.1.15] - 2024-01-02
188 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
190 ## [3.1.15-0] - 2024-01-02
194 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
196 ## [3.1.14] - 2024-01-01
200 - Properly handle dynamic pool with zero minimum size.
202 ## [3.1.13] - 2023-12-30
206 - Reduce branching in several hot code paths.
207 - Use faster object cloning implementation.
209 ## [3.1.12] - 2023-12-27
213 - Fix tasks redistribution triggers at pool destroying.
217 - Switch TypeScript module resolution to Node16.
219 ## [3.1.12-0] - 2023-12-27
223 - Fix tasks redistribution triggers at pool destroying.
225 ## [3.1.11] - 2023-12-24
229 - Avoid worker node cross tasks stealing.
230 - Ensure only half the pool worker nodes can steal tasks.
232 ## [3.1.10] - 2023-12-23
236 - Avoid useless branching on pool type.
238 ## [3.1.9] - 2023-12-22
242 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
244 ## [3.1.8] - 2023-12-21
248 - Fix default worker weight computation.
249 - Fix possible null exception at pool destroying.
251 ## [3.1.7] - 2023-12-20
255 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
257 ## [3.1.6] - 2023-12-18
261 - Fix pool destroying with tasks queuing enabled.
263 ## [3.1.5] - 2023-12-18
267 - Add queued tasks end timeout support to worker node termination.
269 ## [3.1.4] - 2023-12-18
273 - Make more robust the fix for possible null exception at handling task execution response.
275 ## [3.1.3] - 2023-12-17
279 - Fix possible null exception at handling task execution response.
281 ## [3.1.2] - 2023-12-17
285 - Wait for queued tasks to end at worker node termination.
287 ## [3.1.1] - 2023-12-16
291 - Fix pool options TS type definition.
293 ## [3.1.0] - 2023-12-16
297 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
299 ## [3.0.14] - 2023-12-13
303 - Fix possible null exception with worker_threads pools.
305 ## [3.0.13] - 2023-12-12
309 - Ensure worker choice strategy wait for worker nodes readiness.
313 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
315 ## [3.0.12] - 2023-12-12
319 - Add infinite retries support in worker choice strategy.
321 ## [3.0.11] - 2023-12-11
325 - Ensure pool asynchronous resource properly track tasks execution.
327 ## [3.0.10] - 2023-12-08
331 - Add a fastpath when tasks stealing or redistribution is impossible.
333 ## [3.0.9] - 2023-11-26
337 - Remove all pool events listener at pool destroying.
338 - Remove all worker node events listener at worker node destroying.
339 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
341 ## [3.0.8] - 2023-11-25
345 - Ensure continuous tasks stealing on idle start at worker node idling.
347 ## [3.0.7] - 2023-11-24
351 - Make continuous tasks stealing start at worker node idling.
353 ## [3.0.6] - 2023-11-24
357 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
358 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
360 ## [3.0.5] - 2023-10-27
364 - Ensure pool `ready` event can be emitted only once.
366 ## [3.0.4] - 2023-10-20
370 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
371 - Use builtin retry mechanism in worker choice strategies instead of custom one.
373 ## [3.0.3] - 2023-10-19
377 - Avoid null exception at sending message to worker.
378 - Avoid null exception at checking worker node readiness.
380 ## [3.0.2] - 2023-10-17
384 - 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).
386 ## [3.0.1] - 2023-10-16
390 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
394 - Switch the worker node eventing code to `EventTarget` API.
396 ## [3.0.0] - 2023-10-08
400 - Remove Node.js 16.x.x (EOL) support.
402 ## [2.7.5] - 2023-10-03
406 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
408 ## [2.7.4] - 2023-09-25
412 - Fix source maps (bundler issue).
414 ## [2.7.3] - 2023-09-24
418 - Convert pool event emitter to event emitter async resource.
420 ## [2.7.2] - 2023-09-23
424 - Add source maps to npm package to ease debugging.
428 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
430 ## [2.7.1] - 2023-09-20
434 - Ensure worker message listener used one time are removed after usage.
436 ## [2.7.0] - 2023-09-19
440 - Fix task stealing related tasks queue options handling at runtime.
444 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
448 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
449 - Stricter worker constructor arguments validation.
451 ## [2.6.45] - 2023-09-17
455 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
459 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
460 - Add `start()` method to pool API to start the minimum number of workers.
461 - 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.
462 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
464 ## [2.6.44] - 2023-09-08
468 - Use a dedicated PAT to publish on GitHub packages registry.
472 - Publish on GitHub packages registry on release.
476 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
478 ## [2.6.43] - 2023-09-08
482 - Publish on GitHub packages registry on release.
486 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
488 ## [2.6.42] - 2023-09-06
492 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
494 ## [2.6.41] - 2023-09-03
498 - Optimize worker choice strategies implementation.
500 ## [2.6.40] - 2023-09-01
504 - Do not pre-choose in WRR worker choice strategy to avoid bias.
505 - Avoid array out of bound in worker choice strategies after worker node removal.
507 ## [2.6.39] - 2023-08-30
511 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
513 ## [2.6.38] - 2023-08-30
517 - Bundle typescript types declaration into one file.
521 - Improve interleaved weighted round robin worker choice strategy implementation.
523 ## [2.6.37] - 2023-08-28
527 - Ensure unused worker usage statistics are deleted at runtime.
531 - Rename worker choice strategy options `choiceRetries` to `retries`.
532 - Avoid unnecessary branching in worker choice strategies.
534 ## [2.6.36] - 2023-08-27
538 - Fix pool `execute()` arguments check.
542 - Make continuous tasks stealing algorithm less aggressive.
543 - Fine tune tasks stealing algorithm under back pressure.
545 ## [2.6.35] - 2023-08-25
549 - Don't account worker usage statistics for tasks that have failed.
550 - Fix pool information runtime and wait time median computation.
554 - Update simple moving average implementation to use a circular buffer.
555 - Update simple moving median implementation to use a circular buffer.
556 - Account for stolen tasks in worker usage statistics and pool information.
560 - Continuous tasks stealing algorithm.
562 ## [2.6.34] - 2023-08-24
566 - Avoid cascading tasks stealing under back pressure.
570 - Add fastpath to queued tasks rescheduling.
572 ## [2.6.33] - 2023-08-24
576 - Fix queued tasks rescheduling.
580 - Rename tasks queue options `queueMaxSize` to `size`.
584 - Task stealing scheduling algorithm if tasks queueing is enabled.
586 ## [2.6.32] - 2023-08-23
590 - Ensure no task can be executed when the pool is destroyed.
594 - Add `queueMaxSize` option to tasks queue options.
595 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
596 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
598 ## [2.6.31] - 2023-08-20
602 - Fix worker choice strategy retries mechanism in some edge cases.
606 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
607 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
609 ## [2.6.30] - 2023-08-19
613 - Ensure pool event `backPressure` is emitted.
614 - Ensure pool event `full` is emitted only once.
615 - Ensure worker node cannot be instantiated without proper arguments.
617 ## [2.6.29] - 2023-08-18
621 - Fix race condition between readiness and task functions worker message handling at startup.
622 - Fix duplicate task function worker usage statistics computation per task function.
623 - Update task function worker usage statistics if and only if there's at least two different task functions.
624 - Fix race condition at task function worker usage executing task computation leading to negative value.
628 - 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).
629 - Use back pressure detection in worker choice strategies.
630 - Add worker choice strategies retries mechanism if no worker is eligible.
632 ## [2.6.28] - 2023-08-16
636 - Ensure pool workers are properly initialized.
640 - HTTP server pool examples: express-cluster, express-hybrid.
644 - Remove now useless branching in worker hot code path.
646 ## [2.6.27] - 2023-08-15
650 - Add `KillHandler` type definition to exported types.
654 - Add `destroy` event to pool API.
656 ## [2.6.26] - 2023-08-15
660 - Add kill handler to worker options allowing to execute custom code when worker is killed.
661 - Add `listTaskFunctions()` method to pool API.
662 - SMTP client pool example: nodemailer.
664 ## [2.6.25] - 2023-08-13
668 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
669 - WebSocket server pool examples: ws-cluster, ws-hybrid.
671 ## [2.6.24] - 2023-08-12
675 - Add array of transferable objects to the `execute()` method arguments.
676 - WebSocket server pool examples: ws-worker_threads.
678 ## [2.6.23] - 2023-08-11
682 - 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.
686 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
687 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
689 ## [2.6.22] - 2023-08-10
693 - Add missing `types` field to package.json `exports`.
697 - Structure markdown documentation (PR #811).
699 ## [2.6.21] - 2023-08-03
703 - Improve code documentation.
704 - Code refactoring and cleanup for better maintainability and readability.
706 ## [2.6.20] - 2023-07-21
710 - Fix queued tasks redistribution on error task execution starvation.
711 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
715 - Drastically reduce lookups by worker in the worker nodes.
717 ## [2.6.19] - 2023-07-20
721 - Dedicated internal communication channel for worker_threads pools.
723 ## [2.6.18] - 2023-07-19
727 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
729 ## [2.6.17] - 2023-07-16
733 - Add `listTaskFunctions()` method to worker API.
735 ## [2.6.16] - 2023-07-12
739 - Fix pool startup detection.
740 - Fix worker task functions handling.
742 ## [2.6.15] - 2023-07-11
746 - Take into account worker node readiness in worker choice strategies.
748 ## [2.6.14] - 2023-07-10
752 - Fix task function statistics tracking.
754 ## [2.6.13] - 2023-07-10
758 - Add per task function statistics tracking.
759 - Add public methods to manipulate the worker task functions at runtime.
761 ## [2.6.12] - 2023-07-09
765 - Workaround import issue with `node:os` module in node 16.x.x.
767 ## [2.6.11] - 2023-07-09
771 - Fix pool readiness semantic.
773 ## [2.6.10] - 2023-07-08
777 - Ensure workers are not recreated on error at pool startup.
781 - Add `ready` and `strategy` fields to pool information.
782 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
783 - Add dynamic pool sizing checks.
785 ## [2.6.9] - 2023-07-07
789 - Recreate the right worker type on uncaught exception.
793 - Add minimum and maximum to internal measurement statistics.
794 - Add `runTime` and `waitTime` to pool information.
795 - Check worker inactive time only on dynamic worker.
797 ## [2.6.8] - 2023-07-03
801 - Brown paper bag release to fix version handling in pool information.
803 ## [2.6.7] - 2023-07-03
807 - Ensure worker queued tasks at error are reassigned to other pool workers.
811 - Add pool `utilization` ratio to pool information.
812 - Add `version` to pool information.
813 - Add worker information to worker nodes.
815 ## [2.6.6] - 2023-07-01
819 - Add safe helper `availableParallelism()` to help sizing the pool.
823 - Ensure message handler is only registered in worker.
825 ## [2.6.5] - 2023-06-27
829 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
833 - Artificial version bump to 2.6.5 to workaround publication issue.
834 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
835 - Ensure pool event is emitted before task error promise rejection.
836 - Fix queued tasks count computation.
840 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
842 ## [2.6.4] - 2023-06-27
846 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
850 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
851 - Ensure pool event is emitted before task error promise rejection.
852 - Fix queued tasks count computation.
856 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
858 ## [2.6.3] - 2023-06-19
862 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
863 - Update strategies internals after statistics computation.
867 - Optimize O(1) queue implementation.
869 ## [2.6.2] - 2023-06-12
873 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
875 ## [2.6.1] - 2023-06-10
879 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
883 - Fix average statistics computation: ensure failed tasks are not accounted.
885 ## [2.6.0] - 2023-06-09
889 - Add `LEAST_ELU` worker choice strategy (experimental).
890 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
894 - Refactor pool worker node usage internals.
895 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
896 - Breaking change: pool information `info` property object fields have been renamed.
900 - Fix wait time accounting.
901 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
902 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
904 ## [2.5.4] - 2023-06-07
908 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
912 - Compute statistics at the worker level only if needed.
913 - Add `worker_threads` options to thread pool options.
917 - Make the `LEAST_BUSY` strategy only relies on task runtime.
919 ## [2.5.3] - 2023-06-04
923 - Refine pool information content.
924 - Limit pool internals public exposure.
926 ## [2.5.2] - 2023-06-02
930 - Add `taskError` pool event for task execution error.
931 - Add pool information `info` property to pool.
932 - Emit pool information on `busy` and `full` pool events.
934 ## [2.5.1] - 2023-06-01
938 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
939 - Add `error` pool event for uncaught worker error.
941 ## [2.5.0] - 2023-05-31
945 - Switch pool event emitter to `EventEmitterAsyncResource`.
946 - Add tasks wait time accounting in per worker tasks usage.
947 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
951 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
953 ## [2.4.14] - 2023-05-09
957 - Ensure no undefined task runtime can land in the tasks history.
958 - Fix median computation implementation once again.
962 - Unit tests for median and queue implementations.
964 ## [2.4.13] - 2023-05-08
968 - Fix worker choice strategy options validation.
969 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
971 ## [2.4.12] - 2023-05-06
975 - Support multiple task functions per worker.
976 - Add custom worker weights support to worker choice strategies options.
980 - Use O(1) queue implementation for tasks queueing.
984 - Fix median computation implementation.
985 - Fix fair share worker choice strategy internals update.
987 ## [2.4.11] - 2023-04-23
991 - Optimize free worker finding in worker choice strategies.
993 ## [2.4.10] - 2023-04-15
997 - Fix typescript type definition for task function: ensure the input data is optional.
998 - Fix typescript type definition for pool execute(): ensure the input data is optional.
1000 ## [2.4.9] - 2023-04-15
1004 - Add tasks queue enablement runtime setter to pool.
1005 - Add tasks queue options runtime setter to pool.
1006 - Add worker choice strategy options runtime setter to pool.
1010 - Remove the tasks queuing experimental status.
1014 - Fix task function type definition and validation.
1015 - Fix worker choice strategy options handling.
1017 ## [2.4.8] - 2023-04-12
1021 - Fix message between main worker and worker type definition for tasks.
1022 - Fix code documentation.
1024 ## [2.4.7] - 2023-04-11
1028 - Add worker tasks queue options to pool options.
1032 - Fix missing documentation.
1034 ## [2.4.6] - 2023-04-10
1038 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1039 - Properly count worker executing tasks with tasks queueing enabled.
1041 ## [2.4.5] - 2023-04-09
1045 - Use monotonic high resolution timer for worker tasks runtime.
1046 - Add worker tasks median runtime to statistics.
1047 - Add worker tasks queue (experimental).
1049 ## [2.4.4] - 2023-04-07
1053 - Add `PoolEvents` enumeration and `PoolEvent` type.
1057 - Destroy worker only on alive check.
1059 ## [2.4.3] - 2023-04-07
1063 - Fix typedoc generation with inheritance.
1065 ## [2.4.2] - 2023-04-06
1069 - Add `full` event to dynamic pool.
1070 - Keep worker choice strategy in memory for conditional reuse.
1074 - Fix possible negative worker key at worker removal in worker choice strategies.
1076 ## [2.4.1] - 2023-04-05
1080 - Optimize worker choice strategy for dynamic pool.
1084 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1086 ## [2.4.0] - 2023-04-04
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.
1098 - Update benchmark versus external threads pools.
1099 - Optimize tasks usage statistics requirements for worker choice strategy.
1103 - Ensure trimmable characters are checked at pool initialization.
1104 - Fix message id integer overflow.
1105 - Fix pool worker removal in worker choice strategy internals.
1106 - Fix package publication with pnpm.
1108 ## [2.4.0-3] - 2023-04-04
1112 - Add `LESS_BUSY` worker choice strategy.
1116 - Optimize worker storage in pool.
1117 - Optimize worker alive status check.
1118 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1119 - Optimize `LESS_USED` worker choice strategy.
1120 - Update benchmark versus external threads pools.
1124 - Ensure trimmable characters are checked at pool initialization.
1125 - Fix message id integer overflow.
1126 - Fix pool worker removal in worker choice strategy internals.
1127 - Fix package publication with pnpm.
1129 ## [2.4.0-2] - 2023-04-03
1133 - Add `LESS_BUSY` worker choice strategy.
1137 - Optimize worker storage in pool.
1138 - Optimize worker alive status check.
1139 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1140 - Optimize `LESS_USED` worker choice strategy.
1144 - Ensure trimmable characters are checked at pool initialization.
1145 - Fix message id integer overflow.
1146 - Fix pool worker removal in worker choice strategy internals.
1147 - Fix package publication with pnpm.
1149 ## [2.4.0-1] - 2023-04-03
1153 - Add `LESS_BUSY` worker choice strategy.
1157 - Optimize worker storage in pool.
1158 - Optimize worker alive status check.
1159 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1160 - Optimize `LESS_USED` worker choice strategy.
1164 - Ensure trimmable characters are checked at pool initialization.
1165 - Fix message id integer overflow.
1166 - Fix pool worker removal in worker choice strategy internals.
1168 ## [2.4.0-0] - 2023-04-03
1172 - Add `LESS_BUSY` worker choice strategy.
1176 - Optimize worker storage in pool.
1177 - Optimize worker alive status check.
1178 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1179 - Optimize `LESS_USED` worker choice strategy.
1183 - Ensure trimmable characters are checked at pool initialization.
1184 - Fix message id integer overflow.
1185 - Fix pool worker removal in worker choice strategy internals.
1187 ## [2.3.10] - 2023-03-18
1191 - Fix package.json `exports` syntax for ESM and CommonJS.
1195 - Permit SemVer pre-release publication.
1197 ## [2.3.10-2] - 2023-03-18
1201 - Fix package.json `exports` syntax for ESM and CommonJS.
1203 ## [2.3.10-1] - 2023-03-18
1207 - Permit SemVer pre-release publication.
1209 ## [2.3.10-0] - 2023-03-18
1213 - Fix package.json `exports` syntax for ESM and CommonJS.
1215 ## [2.3.9] - 2023-03-18
1219 - Introduce ESM module support along with CommonJS one.
1223 - Fix brown paper bag bug referencing the same object literal.
1225 ## [2.3.8] - 2023-03-18
1229 - Switch internal benchmarking code to benny.
1230 - Switch to TypeScript 5.x.x.
1231 - Switch rollup bundler plugins to core ones.
1232 - Switch to TSDoc syntax.
1233 - Enforce conventional commits.
1237 - Fix random integer generator.
1238 - Fix worker choice strategy pool type identification at initialization.
1240 ## [2.3.7] - 2022-10-23
1244 - Switch to open collective FOSS project funding platform.
1245 - Switch to ts-standard linter configuration on TypeScript code.
1249 - Fixed missing async on pool execute method.
1250 - Fixed typing in TypeScript example.
1251 - Fixed types in unit tests.
1253 ## [2.3.6] - 2022-10-22
1257 - Cleanup pool attributes and methods.
1258 - Refine error types thrown.
1262 - Fix continuous integration build on windows.
1263 - Fix code coverage reporting by using c8 instead of nyc.
1265 ## [2.3.5] - 2022-10-21
1269 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1270 - Optimize tasks usage lookup implementation.
1274 - Fix missed pool event emitter type export.
1275 - Fix typedoc documentation generation.
1277 ## [2.3.4] - 2022-10-17
1281 - Fully automate release process with release-it.
1285 - Optimize fair share task scheduling algorithm implementation.
1286 - Update benchmark versus external pools results with latest version.
1288 ## [2.3.3] - 2022-10-15
1292 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1294 ## [2.3.2] - 2022-10-14
1298 - Optimize fair share worker selection strategy implementation.
1302 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1304 ## [2.3.1] - 2022-10-13
1308 - Pool worker choice strategies:
1309 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1310 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1312 ## [2.2.2] - 2022-10-09
1316 - Fixed `README.md` file.
1318 ## [2.2.1] - 2022-10-08
1322 - Dynamic worker choice strategy change at runtime.
1324 ## [2.2.0] - 2022-01-05
1326 ### Breaking Changes
1328 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1330 ## [2.1.0] - 2021-08-29
1334 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1336 ### Breaking Changes
1338 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1339 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1340 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1341 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1343 ## [2.0.2] - 2021-05-12
1347 - Fix `busy` event emission on fixed pool type
1349 ## [2.0.1] - 2021-03-16
1353 - Check if pool options are properly set.
1354 - `busy` event is emitted on all pool types.
1356 ## [2.0.0] - 2021-03-01
1360 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1362 ### Breaking Changes
1364 - `FullPool` event is now renamed to `busy`.
1365 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1366 _Find more details on our JSDoc._
1368 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1370 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1372 ### Pool options types declaration merge
1374 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1376 #### New `export` strategy
1380 const DynamicThreadPool = require('poolifier/lib/dynamic')
1382 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1385 But you should always prefer just using
1388 const { DynamicThreadPool } = require('poolifier')
1391 #### New type definitions for input data and response
1393 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1394 _This is not a limitation by poolifier but Node.js._
1396 #### Public property replacements
1398 `numWorkers` property is now `numberOfWorkers`
1400 #### Internal (protected) properties and methods renaming
1402 These properties are not intended for end users
1404 - `id` => `nextMessageId`
1406 These methods are not intended for end users
1408 - `_chooseWorker` => `chooseWorker`
1409 - `_newWorker` => `createWorker`
1410 - `_execute` => `internalExecute`
1411 - `_chooseWorker` => `chooseWorker`
1412 - `_checkAlive` => `checkAlive`
1414 - `_runAsync` => `runAsync`
1416 ## [1.1.0] - 2020-05-21
1420 - ThreadWorker support async functions as option
1421 - Various external library patches
1423 ## [1.0.0] - 2020-01-24
1427 - FixedThreadPool implementation
1428 - DynamicThreadPool implementation
1429 - WorkerThread implementation to improve developer experience