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 ## [4.0.10] - 2024-05-20
14 - Ensure tasks stealing dynamic worker node is not destroyed on inactivity.
16 ## [4.0.9] - 2024-05-19
20 - Add ELU `utilization` statistics to pool information.
22 ## [4.0.8] - 2024-05-15
26 - Fix default task function worker choice strategy and priority handling.
28 ## [4.0.7] - 2024-05-13
32 - Add ELU statistics to pool information.
34 ## [4.0.6] - 2024-05-10
38 - Fix pools' `addTaskFunction()` type definition.
40 ## [4.0.5] - 2024-05-09
44 - Avoid queued tasks redistribution on the errored worker node.
46 ## [4.0.4] - 2024-05-08
50 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
52 ## [4.0.3] - 2024-05-08
56 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
58 ## [4.0.2] - 2024-05-06
62 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
64 ## [4.0.1] - 2024-05-02
68 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
69 - 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.
71 ## [4.0.0] - 2024-04-30
75 - 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 }`.
76 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
77 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
78 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
82 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
84 ## [3.1.30] - 2024-04-22
88 - Fix `transferList` argument type definition.
90 ## [3.1.29] - 2024-04-02
94 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
96 ## [3.1.28] - 2024-04-01
100 - Ensure the minimum number of workers on a started pool is guaranteed.
102 ## [3.1.27] - 2024-03-27
106 - Fix publishing on JSR, take 4.
108 ## [3.1.26] - 2024-03-27
112 - Fix publishing on JSR, take 3.
114 ## [3.1.25] - 2024-03-27
118 - Fix publishing on JSR, take 2.
120 ## [3.1.24] - 2024-03-27
124 - Fix publishing on JSR.
126 ## [3.1.23] - 2024-03-27
132 ## [3.1.22] - 2024-03-15
136 - Fix pool event emitter registered callbacks removal at `destroy()`.
138 ## [3.1.21] - 2024-02-22
142 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
144 ## [3.1.20] - 2024-02-11
148 - Ensure `worker_threads` workers are unreferenced at termination.
150 ## [3.1.19] - 2024-01-16
154 - Fix possible null exception at task finishing handling.
158 - Optimize Deque implementation to improve tasks queueing performance.
160 ## [3.1.18] - 2024-01-06
164 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
166 ## [3.1.17] - 2024-01-05
170 - Improve performance by clean up unneeded condition checks on hot code paths.
172 ## [3.1.16] - 2024-01-03
176 - Add missing type to TS type definitions.
178 ## [3.1.15] - 2024-01-02
182 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
184 ## [3.1.15-0] - 2024-01-02
188 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
190 ## [3.1.14] - 2024-01-01
194 - Properly handle dynamic pool with zero minimum size.
196 ## [3.1.13] - 2023-12-30
200 - Reduce branching in several hot code paths.
201 - Use faster object cloning implementation.
203 ## [3.1.12] - 2023-12-27
207 - Fix tasks redistribution triggers at pool destroying.
211 - Switch TypeScript module resolution to Node16.
213 ## [3.1.12-0] - 2023-12-27
217 - Fix tasks redistribution triggers at pool destroying.
219 ## [3.1.11] - 2023-12-24
223 - Avoid worker node cross tasks stealing.
224 - Ensure only half the pool worker nodes can steal tasks.
226 ## [3.1.10] - 2023-12-23
230 - Avoid useless branching on pool type.
232 ## [3.1.9] - 2023-12-22
236 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
238 ## [3.1.8] - 2023-12-21
242 - Fix default worker weight computation.
243 - Fix possible null exception at pool destroying.
245 ## [3.1.7] - 2023-12-20
249 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
251 ## [3.1.6] - 2023-12-18
255 - Fix pool destroying with tasks queuing enabled.
257 ## [3.1.5] - 2023-12-18
261 - Add queued tasks end timeout support to worker node termination.
263 ## [3.1.4] - 2023-12-18
267 - Make more robust the fix for possible null exception at handling task execution response.
269 ## [3.1.3] - 2023-12-17
273 - Fix possible null exception at handling task execution response.
275 ## [3.1.2] - 2023-12-17
279 - Wait for queued tasks to end at worker node termination.
281 ## [3.1.1] - 2023-12-16
285 - Fix pool options TS type definition.
287 ## [3.1.0] - 2023-12-16
291 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
293 ## [3.0.14] - 2023-12-13
297 - Fix possible null exception with worker_threads pools.
299 ## [3.0.13] - 2023-12-12
303 - Ensure worker choice strategy wait for worker nodes readiness.
307 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
309 ## [3.0.12] - 2023-12-12
313 - Add infinite retries support in worker choice strategy.
315 ## [3.0.11] - 2023-12-11
319 - Ensure pool asynchronous resource properly track tasks execution.
321 ## [3.0.10] - 2023-12-08
325 - Add a fastpath when tasks stealing or redistribution is impossible.
327 ## [3.0.9] - 2023-11-26
331 - Remove all pool events listener at pool destroying.
332 - Remove all worker node events listener at worker node destroying.
333 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
335 ## [3.0.8] - 2023-11-25
339 - Ensure continuous tasks stealing on idle start at worker node idling.
341 ## [3.0.7] - 2023-11-24
345 - Make continuous tasks stealing start at worker node idling.
347 ## [3.0.6] - 2023-11-24
351 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
352 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
354 ## [3.0.5] - 2023-10-27
358 - Ensure pool `ready` event can be emitted only once.
360 ## [3.0.4] - 2023-10-20
364 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
365 - Use builtin retry mechanism in worker choice strategies instead of custom one.
367 ## [3.0.3] - 2023-10-19
371 - Avoid null exception at sending message to worker.
372 - Avoid null exception at checking worker node readiness.
374 ## [3.0.2] - 2023-10-17
378 - 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).
380 ## [3.0.1] - 2023-10-16
384 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
388 - Switch the worker node eventing code to `EventTarget` API.
390 ## [3.0.0] - 2023-10-08
394 - Remove Node.js 16.x.x (EOL) support.
396 ## [2.7.5] - 2023-10-03
400 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
402 ## [2.7.4] - 2023-09-25
406 - Fix source maps (bundler issue).
408 ## [2.7.3] - 2023-09-24
412 - Convert pool event emitter to event emitter async resource.
414 ## [2.7.2] - 2023-09-23
418 - Add source maps to npm package to ease debugging.
422 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
424 ## [2.7.1] - 2023-09-20
428 - Ensure worker message listener used one time are removed after usage.
430 ## [2.7.0] - 2023-09-19
434 - Fix task stealing related tasks queue options handling at runtime.
438 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
442 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
443 - Stricter worker constructor arguments validation.
445 ## [2.6.45] - 2023-09-17
449 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
453 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
454 - Add `start()` method to pool API to start the minimum number of workers.
455 - 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.
456 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
458 ## [2.6.44] - 2023-09-08
462 - Use a dedicated PAT to publish on GitHub packages registry.
466 - Publish on GitHub packages registry on release.
470 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
472 ## [2.6.43] - 2023-09-08
476 - Publish on GitHub packages registry on release.
480 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
482 ## [2.6.42] - 2023-09-06
486 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
488 ## [2.6.41] - 2023-09-03
492 - Optimize worker choice strategies implementation.
494 ## [2.6.40] - 2023-09-01
498 - Do not pre-choose in WRR worker choice strategy to avoid bias.
499 - Avoid array out of bound in worker choice strategies after worker node removal.
501 ## [2.6.39] - 2023-08-30
505 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
507 ## [2.6.38] - 2023-08-30
511 - Bundle typescript types declaration into one file.
515 - Improve interleaved weighted round robin worker choice strategy implementation.
517 ## [2.6.37] - 2023-08-28
521 - Ensure unused worker usage statistics are deleted at runtime.
525 - Rename worker choice strategy options `choiceRetries` to `retries`.
526 - Avoid unnecessary branching in worker choice strategies.
528 ## [2.6.36] - 2023-08-27
532 - Fix pool `execute()` arguments check.
536 - Make continuous tasks stealing algorithm less aggressive.
537 - Fine tune tasks stealing algorithm under back pressure.
539 ## [2.6.35] - 2023-08-25
543 - Don't account worker usage statistics for tasks that have failed.
544 - Fix pool information runtime and wait time median computation.
548 - Update simple moving average implementation to use a circular buffer.
549 - Update simple moving median implementation to use a circular buffer.
550 - Account for stolen tasks in worker usage statistics and pool information.
554 - Continuous tasks stealing algorithm.
556 ## [2.6.34] - 2023-08-24
560 - Avoid cascading tasks stealing under back pressure.
564 - Add fastpath to queued tasks rescheduling.
566 ## [2.6.33] - 2023-08-24
570 - Fix queued tasks rescheduling.
574 - Rename tasks queue options `queueMaxSize` to `size`.
578 - Task stealing scheduling algorithm if tasks queueing is enabled.
580 ## [2.6.32] - 2023-08-23
584 - Ensure no task can be executed when the pool is destroyed.
588 - Add `queueMaxSize` option to tasks queue options.
589 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
590 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
592 ## [2.6.31] - 2023-08-20
596 - Fix worker choice strategy retries mechanism in some edge cases.
600 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
601 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
603 ## [2.6.30] - 2023-08-19
607 - Ensure pool event `backPressure` is emitted.
608 - Ensure pool event `full` is emitted only once.
609 - Ensure worker node cannot be instantiated without proper arguments.
611 ## [2.6.29] - 2023-08-18
615 - Fix race condition between readiness and task functions worker message handling at startup.
616 - Fix duplicate task function worker usage statistics computation per task function.
617 - Update task function worker usage statistics if and only if there's at least two different task functions.
618 - Fix race condition at task function worker usage executing task computation leading to negative value.
622 - 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).
623 - Use back pressure detection in worker choice strategies.
624 - Add worker choice strategies retries mechanism if no worker is eligible.
626 ## [2.6.28] - 2023-08-16
630 - Ensure pool workers are properly initialized.
634 - HTTP server pool examples: express-cluster, express-hybrid.
638 - Remove now useless branching in worker hot code path.
640 ## [2.6.27] - 2023-08-15
644 - Add `KillHandler` type definition to exported types.
648 - Add `destroy` event to pool API.
650 ## [2.6.26] - 2023-08-15
654 - Add kill handler to worker options allowing to execute custom code when worker is killed.
655 - Add `listTaskFunctions()` method to pool API.
656 - SMTP client pool example: nodemailer.
658 ## [2.6.25] - 2023-08-13
662 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
663 - WebSocket server pool examples: ws-cluster, ws-hybrid.
665 ## [2.6.24] - 2023-08-12
669 - Add array of transferable objects to the `execute()` method arguments.
670 - WebSocket server pool examples: ws-worker_threads.
672 ## [2.6.23] - 2023-08-11
676 - 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.
680 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
681 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
683 ## [2.6.22] - 2023-08-10
687 - Add missing `types` field to package.json `exports`.
691 - Structure markdown documentation (PR #811).
693 ## [2.6.21] - 2023-08-03
697 - Improve code documentation.
698 - Code refactoring and cleanup for better maintainability and readability.
700 ## [2.6.20] - 2023-07-21
704 - Fix queued tasks redistribution on error task execution starvation.
705 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
709 - Drastically reduce lookups by worker in the worker nodes.
711 ## [2.6.19] - 2023-07-20
715 - Dedicated internal communication channel for worker_threads pools.
717 ## [2.6.18] - 2023-07-19
721 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
723 ## [2.6.17] - 2023-07-16
727 - Add `listTaskFunctions()` method to worker API.
729 ## [2.6.16] - 2023-07-12
733 - Fix pool startup detection.
734 - Fix worker task functions handling.
736 ## [2.6.15] - 2023-07-11
740 - Take into account worker node readiness in worker choice strategies.
742 ## [2.6.14] - 2023-07-10
746 - Fix task function statistics tracking.
748 ## [2.6.13] - 2023-07-10
752 - Add per task function statistics tracking.
753 - Add public methods to manipulate the worker task functions at runtime.
755 ## [2.6.12] - 2023-07-09
759 - Workaround import issue with `node:os` module in node 16.x.x.
761 ## [2.6.11] - 2023-07-09
765 - Fix pool readiness semantic.
767 ## [2.6.10] - 2023-07-08
771 - Ensure workers are not recreated on error at pool startup.
775 - Add `ready` and `strategy` fields to pool information.
776 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
777 - Add dynamic pool sizing checks.
779 ## [2.6.9] - 2023-07-07
783 - Recreate the right worker type on uncaught exception.
787 - Add minimum and maximum to internal measurement statistics.
788 - Add `runTime` and `waitTime` to pool information.
789 - Check worker inactive time only on dynamic worker.
791 ## [2.6.8] - 2023-07-03
795 - Brown paper bag release to fix version handling in pool information.
797 ## [2.6.7] - 2023-07-03
801 - Ensure worker queued tasks at error are reassigned to other pool workers.
805 - Add pool `utilization` ratio to pool information.
806 - Add `version` to pool information.
807 - Add worker information to worker nodes.
809 ## [2.6.6] - 2023-07-01
813 - Add safe helper `availableParallelism()` to help sizing the pool.
817 - Ensure message handler is only registered in worker.
819 ## [2.6.5] - 2023-06-27
823 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
827 - Artificial version bump to 2.6.5 to workaround publication issue.
828 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
829 - Ensure pool event is emitted before task error promise rejection.
830 - Fix queued tasks count computation.
834 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
836 ## [2.6.4] - 2023-06-27
840 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
844 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
845 - Ensure pool event is emitted before task error promise rejection.
846 - Fix queued tasks count computation.
850 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
852 ## [2.6.3] - 2023-06-19
856 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
857 - Update strategies internals after statistics computation.
861 - Optimize O(1) queue implementation.
863 ## [2.6.2] - 2023-06-12
867 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
869 ## [2.6.1] - 2023-06-10
873 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
877 - Fix average statistics computation: ensure failed tasks are not accounted.
879 ## [2.6.0] - 2023-06-09
883 - Add `LEAST_ELU` worker choice strategy (experimental).
884 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
888 - Refactor pool worker node usage internals.
889 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
890 - Breaking change: pool information `info` property object fields have been renamed.
894 - Fix wait time accounting.
895 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
896 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
898 ## [2.5.4] - 2023-06-07
902 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
906 - Compute statistics at the worker level only if needed.
907 - Add `worker_threads` options to thread pool options.
911 - Make the `LEAST_BUSY` strategy only relies on task runtime.
913 ## [2.5.3] - 2023-06-04
917 - Refine pool information content.
918 - Limit pool internals public exposure.
920 ## [2.5.2] - 2023-06-02
924 - Add `taskError` pool event for task execution error.
925 - Add pool information `info` property to pool.
926 - Emit pool information on `busy` and `full` pool events.
928 ## [2.5.1] - 2023-06-01
932 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
933 - Add `error` pool event for uncaught worker error.
935 ## [2.5.0] - 2023-05-31
939 - Switch pool event emitter to `EventEmitterAsyncResource`.
940 - Add tasks wait time accounting in per worker tasks usage.
941 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
945 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
947 ## [2.4.14] - 2023-05-09
951 - Ensure no undefined task runtime can land in the tasks history.
952 - Fix median computation implementation once again.
956 - Unit tests for median and queue implementations.
958 ## [2.4.13] - 2023-05-08
962 - Fix worker choice strategy options validation.
963 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
965 ## [2.4.12] - 2023-05-06
969 - Support multiple task functions per worker.
970 - Add custom worker weights support to worker choice strategies options.
974 - Use O(1) queue implementation for tasks queueing.
978 - Fix median computation implementation.
979 - Fix fair share worker choice strategy internals update.
981 ## [2.4.11] - 2023-04-23
985 - Optimize free worker finding in worker choice strategies.
987 ## [2.4.10] - 2023-04-15
991 - Fix typescript type definition for task function: ensure the input data is optional.
992 - Fix typescript type definition for pool execute(): ensure the input data is optional.
994 ## [2.4.9] - 2023-04-15
998 - Add tasks queue enablement runtime setter to pool.
999 - Add tasks queue options runtime setter to pool.
1000 - Add worker choice strategy options runtime setter to pool.
1004 - Remove the tasks queuing experimental status.
1008 - Fix task function type definition and validation.
1009 - Fix worker choice strategy options handling.
1011 ## [2.4.8] - 2023-04-12
1015 - Fix message between main worker and worker type definition for tasks.
1016 - Fix code documentation.
1018 ## [2.4.7] - 2023-04-11
1022 - Add worker tasks queue options to pool options.
1026 - Fix missing documentation.
1028 ## [2.4.6] - 2023-04-10
1032 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1033 - Properly count worker executing tasks with tasks queueing enabled.
1035 ## [2.4.5] - 2023-04-09
1039 - Use monotonic high resolution timer for worker tasks runtime.
1040 - Add worker tasks median runtime to statistics.
1041 - Add worker tasks queue (experimental).
1043 ## [2.4.4] - 2023-04-07
1047 - Add `PoolEvents` enumeration and `PoolEvent` type.
1051 - Destroy worker only on alive check.
1053 ## [2.4.3] - 2023-04-07
1057 - Fix typedoc generation with inheritance.
1059 ## [2.4.2] - 2023-04-06
1063 - Add `full` event to dynamic pool.
1064 - Keep worker choice strategy in memory for conditional reuse.
1068 - Fix possible negative worker key at worker removal in worker choice strategies.
1070 ## [2.4.1] - 2023-04-05
1074 - Optimize worker choice strategy for dynamic pool.
1078 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1080 ## [2.4.0] - 2023-04-04
1084 - Add `LESS_BUSY` worker choice strategy.
1088 - Optimize worker storage in pool.
1089 - Optimize worker alive status check.
1090 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1091 - Optimize `LESS_USED` worker choice strategy.
1092 - Update benchmark versus external threads pools.
1093 - Optimize tasks usage statistics requirements for worker choice strategy.
1097 - Ensure trimmable characters are checked at pool initialization.
1098 - Fix message id integer overflow.
1099 - Fix pool worker removal in worker choice strategy internals.
1100 - Fix package publication with pnpm.
1102 ## [2.4.0-3] - 2023-04-04
1106 - Add `LESS_BUSY` worker choice strategy.
1110 - Optimize worker storage in pool.
1111 - Optimize worker alive status check.
1112 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1113 - Optimize `LESS_USED` worker choice strategy.
1114 - Update benchmark versus external threads pools.
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 ## [2.4.0-2] - 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.
1141 - Fix package publication with pnpm.
1143 ## [2.4.0-1] - 2023-04-03
1147 - Add `LESS_BUSY` worker choice strategy.
1151 - Optimize worker storage in pool.
1152 - Optimize worker alive status check.
1153 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1154 - Optimize `LESS_USED` worker choice strategy.
1158 - Ensure trimmable characters are checked at pool initialization.
1159 - Fix message id integer overflow.
1160 - Fix pool worker removal in worker choice strategy internals.
1162 ## [2.4.0-0] - 2023-04-03
1166 - Add `LESS_BUSY` worker choice strategy.
1170 - Optimize worker storage in pool.
1171 - Optimize worker alive status check.
1172 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1173 - Optimize `LESS_USED` worker choice strategy.
1177 - Ensure trimmable characters are checked at pool initialization.
1178 - Fix message id integer overflow.
1179 - Fix pool worker removal in worker choice strategy internals.
1181 ## [2.3.10] - 2023-03-18
1185 - Fix package.json `exports` syntax for ESM and CommonJS.
1189 - Permit SemVer pre-release publication.
1191 ## [2.3.10-2] - 2023-03-18
1195 - Fix package.json `exports` syntax for ESM and CommonJS.
1197 ## [2.3.10-1] - 2023-03-18
1201 - Permit SemVer pre-release publication.
1203 ## [2.3.10-0] - 2023-03-18
1207 - Fix package.json `exports` syntax for ESM and CommonJS.
1209 ## [2.3.9] - 2023-03-18
1213 - Introduce ESM module support along with CommonJS one.
1217 - Fix brown paper bag bug referencing the same object literal.
1219 ## [2.3.8] - 2023-03-18
1223 - Switch internal benchmarking code to benny.
1224 - Switch to TypeScript 5.x.x.
1225 - Switch rollup bundler plugins to core ones.
1226 - Switch to TSDoc syntax.
1227 - Enforce conventional commits.
1231 - Fix random integer generator.
1232 - Fix worker choice strategy pool type identification at initialization.
1234 ## [2.3.7] - 2022-10-23
1238 - Switch to open collective FOSS project funding platform.
1239 - Switch to ts-standard linter configuration on TypeScript code.
1243 - Fixed missing async on pool execute method.
1244 - Fixed typing in TypeScript example.
1245 - Fixed types in unit tests.
1247 ## [2.3.6] - 2022-10-22
1251 - Cleanup pool attributes and methods.
1252 - Refine error types thrown.
1256 - Fix continuous integration build on windows.
1257 - Fix code coverage reporting by using c8 instead of nyc.
1259 ## [2.3.5] - 2022-10-21
1263 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1264 - Optimize tasks usage lookup implementation.
1268 - Fix missed pool event emitter type export.
1269 - Fix typedoc documentation generation.
1271 ## [2.3.4] - 2022-10-17
1275 - Fully automate release process with release-it.
1279 - Optimize fair share task scheduling algorithm implementation.
1280 - Update benchmark versus external pools results with latest version.
1282 ## [2.3.3] - 2022-10-15
1286 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1288 ## [2.3.2] - 2022-10-14
1292 - Optimize fair share worker selection strategy implementation.
1296 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1298 ## [2.3.1] - 2022-10-13
1302 - Pool worker choice strategies:
1303 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1304 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1306 ## [2.2.2] - 2022-10-09
1310 - Fixed `README.md` file.
1312 ## [2.2.1] - 2022-10-08
1316 - Dynamic worker choice strategy change at runtime.
1318 ## [2.2.0] - 2022-01-05
1320 ### Breaking Changes
1322 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1324 ## [2.1.0] - 2021-08-29
1328 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1330 ### Breaking Changes
1332 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1333 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1334 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1335 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1337 ## [2.0.2] - 2021-05-12
1341 - Fix `busy` event emission on fixed pool type
1343 ## [2.0.1] - 2021-03-16
1347 - Check if pool options are properly set.
1348 - `busy` event is emitted on all pool types.
1350 ## [2.0.0] - 2021-03-01
1354 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1356 ### Breaking Changes
1358 - `FullPool` event is now renamed to `busy`.
1359 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1360 _Find more details on our JSDoc._
1362 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1364 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1366 ### Pool options types declaration merge
1368 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1370 #### New `export` strategy
1374 const DynamicThreadPool = require('poolifier/lib/dynamic')
1376 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1379 But you should always prefer just using
1382 const { DynamicThreadPool } = require('poolifier')
1385 #### New type definitions for input data and response
1387 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1388 _This is not a limitation by poolifier but Node.js._
1390 #### Public property replacements
1392 `numWorkers` property is now `numberOfWorkers`
1394 #### Internal (protected) properties and methods renaming
1396 These properties are not intended for end users
1398 - `id` => `nextMessageId`
1400 These methods are not intended for end users
1402 - `_chooseWorker` => `chooseWorker`
1403 - `_newWorker` => `createWorker`
1404 - `_execute` => `internalExecute`
1405 - `_chooseWorker` => `chooseWorker`
1406 - `_checkAlive` => `checkAlive`
1408 - `_runAsync` => `runAsync`
1410 ## [1.1.0] - 2020-05-21
1414 - ThreadWorker support async functions as option
1415 - Various external library patches
1417 ## [1.0.0] - 2020-01-24
1421 - FixedThreadPool implementation
1422 - DynamicThreadPool implementation
1423 - WorkerThread implementation to improve developer experience