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 - Optimize circular buffer implementation to store task execution measurements.
14 ## [4.0.11] - 2024-05-21
18 - Switch to optimized circular buffer implementation to store task execution measurements.
20 ## [4.0.10] - 2024-05-20
24 - Ensure tasks stealing dynamic worker node is not destroyed on inactivity.
26 ## [4.0.9] - 2024-05-19
30 - Add ELU `utilization` statistics to pool information.
32 ## [4.0.8] - 2024-05-15
36 - Fix default task function worker choice strategy and priority handling.
38 ## [4.0.7] - 2024-05-13
42 - Add ELU statistics to pool information.
44 ## [4.0.6] - 2024-05-10
48 - Fix pools' `addTaskFunction()` type definition.
50 ## [4.0.5] - 2024-05-09
54 - Avoid queued tasks redistribution on the errored worker node.
56 ## [4.0.4] - 2024-05-08
60 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
62 ## [4.0.3] - 2024-05-08
66 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
68 ## [4.0.2] - 2024-05-06
72 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
74 ## [4.0.1] - 2024-05-02
78 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
79 - 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.
81 ## [4.0.0] - 2024-04-30
85 - 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 }`.
86 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
87 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
88 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
92 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
94 ## [3.1.30] - 2024-04-22
98 - Fix `transferList` argument type definition.
100 ## [3.1.29] - 2024-04-02
104 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
106 ## [3.1.28] - 2024-04-01
110 - Ensure the minimum number of workers on a started pool is guaranteed.
112 ## [3.1.27] - 2024-03-27
116 - Fix publishing on JSR, take 4.
118 ## [3.1.26] - 2024-03-27
122 - Fix publishing on JSR, take 3.
124 ## [3.1.25] - 2024-03-27
128 - Fix publishing on JSR, take 2.
130 ## [3.1.24] - 2024-03-27
134 - Fix publishing on JSR.
136 ## [3.1.23] - 2024-03-27
142 ## [3.1.22] - 2024-03-15
146 - Fix pool event emitter registered callbacks removal at `destroy()`.
148 ## [3.1.21] - 2024-02-22
152 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
154 ## [3.1.20] - 2024-02-11
158 - Ensure `worker_threads` workers are unreferenced at termination.
160 ## [3.1.19] - 2024-01-16
164 - Fix possible null exception at task finishing handling.
168 - Optimize Deque implementation to improve tasks queueing performance.
170 ## [3.1.18] - 2024-01-06
174 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
176 ## [3.1.17] - 2024-01-05
180 - Improve performance by clean up unneeded condition checks on hot code paths.
182 ## [3.1.16] - 2024-01-03
186 - Add missing type to TS type definitions.
188 ## [3.1.15] - 2024-01-02
192 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
194 ## [3.1.15-0] - 2024-01-02
198 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
200 ## [3.1.14] - 2024-01-01
204 - Properly handle dynamic pool with zero minimum size.
206 ## [3.1.13] - 2023-12-30
210 - Reduce branching in several hot code paths.
211 - Use faster object cloning implementation.
213 ## [3.1.12] - 2023-12-27
217 - Fix tasks redistribution triggers at pool destroying.
221 - Switch TypeScript module resolution to Node16.
223 ## [3.1.12-0] - 2023-12-27
227 - Fix tasks redistribution triggers at pool destroying.
229 ## [3.1.11] - 2023-12-24
233 - Avoid worker node cross tasks stealing.
234 - Ensure only half the pool worker nodes can steal tasks.
236 ## [3.1.10] - 2023-12-23
240 - Avoid useless branching on pool type.
242 ## [3.1.9] - 2023-12-22
246 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
248 ## [3.1.8] - 2023-12-21
252 - Fix default worker weight computation.
253 - Fix possible null exception at pool destroying.
255 ## [3.1.7] - 2023-12-20
259 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
261 ## [3.1.6] - 2023-12-18
265 - Fix pool destroying with tasks queuing enabled.
267 ## [3.1.5] - 2023-12-18
271 - Add queued tasks end timeout support to worker node termination.
273 ## [3.1.4] - 2023-12-18
277 - Make more robust the fix for possible null exception at handling task execution response.
279 ## [3.1.3] - 2023-12-17
283 - Fix possible null exception at handling task execution response.
285 ## [3.1.2] - 2023-12-17
289 - Wait for queued tasks to end at worker node termination.
291 ## [3.1.1] - 2023-12-16
295 - Fix pool options TS type definition.
297 ## [3.1.0] - 2023-12-16
301 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
303 ## [3.0.14] - 2023-12-13
307 - Fix possible null exception with worker_threads pools.
309 ## [3.0.13] - 2023-12-12
313 - Ensure worker choice strategy wait for worker nodes readiness.
317 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
319 ## [3.0.12] - 2023-12-12
323 - Add infinite retries support in worker choice strategy.
325 ## [3.0.11] - 2023-12-11
329 - Ensure pool asynchronous resource properly track tasks execution.
331 ## [3.0.10] - 2023-12-08
335 - Add a fastpath when tasks stealing or redistribution is impossible.
337 ## [3.0.9] - 2023-11-26
341 - Remove all pool events listener at pool destroying.
342 - Remove all worker node events listener at worker node destroying.
343 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
345 ## [3.0.8] - 2023-11-25
349 - Ensure continuous tasks stealing on idle start at worker node idling.
351 ## [3.0.7] - 2023-11-24
355 - Make continuous tasks stealing start at worker node idling.
357 ## [3.0.6] - 2023-11-24
361 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
362 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
364 ## [3.0.5] - 2023-10-27
368 - Ensure pool `ready` event can be emitted only once.
370 ## [3.0.4] - 2023-10-20
374 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
375 - Use builtin retry mechanism in worker choice strategies instead of custom one.
377 ## [3.0.3] - 2023-10-19
381 - Avoid null exception at sending message to worker.
382 - Avoid null exception at checking worker node readiness.
384 ## [3.0.2] - 2023-10-17
388 - 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).
390 ## [3.0.1] - 2023-10-16
394 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
398 - Switch the worker node eventing code to `EventTarget` API.
400 ## [3.0.0] - 2023-10-08
404 - Remove Node.js 16.x.x (EOL) support.
406 ## [2.7.5] - 2023-10-03
410 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
412 ## [2.7.4] - 2023-09-25
416 - Fix source maps (bundler issue).
418 ## [2.7.3] - 2023-09-24
422 - Convert pool event emitter to event emitter async resource.
424 ## [2.7.2] - 2023-09-23
428 - Add source maps to npm package to ease debugging.
432 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
434 ## [2.7.1] - 2023-09-20
438 - Ensure worker message listener used one time are removed after usage.
440 ## [2.7.0] - 2023-09-19
444 - Fix task stealing related tasks queue options handling at runtime.
448 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
452 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
453 - Stricter worker constructor arguments validation.
455 ## [2.6.45] - 2023-09-17
459 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
463 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
464 - Add `start()` method to pool API to start the minimum number of workers.
465 - 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.
466 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
468 ## [2.6.44] - 2023-09-08
472 - Use a dedicated PAT to publish on GitHub packages registry.
476 - Publish on GitHub packages registry on release.
480 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
482 ## [2.6.43] - 2023-09-08
486 - Publish on GitHub packages registry on release.
490 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
492 ## [2.6.42] - 2023-09-06
496 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
498 ## [2.6.41] - 2023-09-03
502 - Optimize worker choice strategies implementation.
504 ## [2.6.40] - 2023-09-01
508 - Do not pre-choose in WRR worker choice strategy to avoid bias.
509 - Avoid array out of bound in worker choice strategies after worker node removal.
511 ## [2.6.39] - 2023-08-30
515 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
517 ## [2.6.38] - 2023-08-30
521 - Bundle typescript types declaration into one file.
525 - Improve interleaved weighted round robin worker choice strategy implementation.
527 ## [2.6.37] - 2023-08-28
531 - Ensure unused worker usage statistics are deleted at runtime.
535 - Rename worker choice strategy options `choiceRetries` to `retries`.
536 - Avoid unnecessary branching in worker choice strategies.
538 ## [2.6.36] - 2023-08-27
542 - Fix pool `execute()` arguments check.
546 - Make continuous tasks stealing algorithm less aggressive.
547 - Fine tune tasks stealing algorithm under back pressure.
549 ## [2.6.35] - 2023-08-25
553 - Don't account worker usage statistics for tasks that have failed.
554 - Fix pool information runtime and wait time median computation.
558 - Update simple moving average implementation to use a circular buffer.
559 - Update simple moving median implementation to use a circular buffer.
560 - Account for stolen tasks in worker usage statistics and pool information.
564 - Continuous tasks stealing algorithm.
566 ## [2.6.34] - 2023-08-24
570 - Avoid cascading tasks stealing under back pressure.
574 - Add fastpath to queued tasks rescheduling.
576 ## [2.6.33] - 2023-08-24
580 - Fix queued tasks rescheduling.
584 - Rename tasks queue options `queueMaxSize` to `size`.
588 - Task stealing scheduling algorithm if tasks queueing is enabled.
590 ## [2.6.32] - 2023-08-23
594 - Ensure no task can be executed when the pool is destroyed.
598 - Add `queueMaxSize` option to tasks queue options.
599 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
600 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
602 ## [2.6.31] - 2023-08-20
606 - Fix worker choice strategy retries mechanism in some edge cases.
610 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
611 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
613 ## [2.6.30] - 2023-08-19
617 - Ensure pool event `backPressure` is emitted.
618 - Ensure pool event `full` is emitted only once.
619 - Ensure worker node cannot be instantiated without proper arguments.
621 ## [2.6.29] - 2023-08-18
625 - Fix race condition between readiness and task functions worker message handling at startup.
626 - Fix duplicate task function worker usage statistics computation per task function.
627 - Update task function worker usage statistics if and only if there's at least two different task functions.
628 - Fix race condition at task function worker usage executing task computation leading to negative value.
632 - 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).
633 - Use back pressure detection in worker choice strategies.
634 - Add worker choice strategies retries mechanism if no worker is eligible.
636 ## [2.6.28] - 2023-08-16
640 - Ensure pool workers are properly initialized.
644 - HTTP server pool examples: express-cluster, express-hybrid.
648 - Remove now useless branching in worker hot code path.
650 ## [2.6.27] - 2023-08-15
654 - Add `KillHandler` type definition to exported types.
658 - Add `destroy` event to pool API.
660 ## [2.6.26] - 2023-08-15
664 - Add kill handler to worker options allowing to execute custom code when worker is killed.
665 - Add `listTaskFunctions()` method to pool API.
666 - SMTP client pool example: nodemailer.
668 ## [2.6.25] - 2023-08-13
672 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
673 - WebSocket server pool examples: ws-cluster, ws-hybrid.
675 ## [2.6.24] - 2023-08-12
679 - Add array of transferable objects to the `execute()` method arguments.
680 - WebSocket server pool examples: ws-worker_threads.
682 ## [2.6.23] - 2023-08-11
686 - 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.
690 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
691 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
693 ## [2.6.22] - 2023-08-10
697 - Add missing `types` field to package.json `exports`.
701 - Structure markdown documentation (PR #811).
703 ## [2.6.21] - 2023-08-03
707 - Improve code documentation.
708 - Code refactoring and cleanup for better maintainability and readability.
710 ## [2.6.20] - 2023-07-21
714 - Fix queued tasks redistribution on error task execution starvation.
715 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
719 - Drastically reduce lookups by worker in the worker nodes.
721 ## [2.6.19] - 2023-07-20
725 - Dedicated internal communication channel for worker_threads pools.
727 ## [2.6.18] - 2023-07-19
731 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
733 ## [2.6.17] - 2023-07-16
737 - Add `listTaskFunctions()` method to worker API.
739 ## [2.6.16] - 2023-07-12
743 - Fix pool startup detection.
744 - Fix worker task functions handling.
746 ## [2.6.15] - 2023-07-11
750 - Take into account worker node readiness in worker choice strategies.
752 ## [2.6.14] - 2023-07-10
756 - Fix task function statistics tracking.
758 ## [2.6.13] - 2023-07-10
762 - Add per task function statistics tracking.
763 - Add public methods to manipulate the worker task functions at runtime.
765 ## [2.6.12] - 2023-07-09
769 - Workaround import issue with `node:os` module in node 16.x.x.
771 ## [2.6.11] - 2023-07-09
775 - Fix pool readiness semantic.
777 ## [2.6.10] - 2023-07-08
781 - Ensure workers are not recreated on error at pool startup.
785 - Add `ready` and `strategy` fields to pool information.
786 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
787 - Add dynamic pool sizing checks.
789 ## [2.6.9] - 2023-07-07
793 - Recreate the right worker type on uncaught exception.
797 - Add minimum and maximum to internal measurement statistics.
798 - Add `runTime` and `waitTime` to pool information.
799 - Check worker inactive time only on dynamic worker.
801 ## [2.6.8] - 2023-07-03
805 - Brown paper bag release to fix version handling in pool information.
807 ## [2.6.7] - 2023-07-03
811 - Ensure worker queued tasks at error are reassigned to other pool workers.
815 - Add pool `utilization` ratio to pool information.
816 - Add `version` to pool information.
817 - Add worker information to worker nodes.
819 ## [2.6.6] - 2023-07-01
823 - Add safe helper `availableParallelism()` to help sizing the pool.
827 - Ensure message handler is only registered in worker.
829 ## [2.6.5] - 2023-06-27
833 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
837 - Artificial version bump to 2.6.5 to workaround publication issue.
838 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
839 - Ensure pool event is emitted before task error promise rejection.
840 - Fix queued tasks count computation.
844 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
846 ## [2.6.4] - 2023-06-27
850 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
854 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
855 - Ensure pool event is emitted before task error promise rejection.
856 - Fix queued tasks count computation.
860 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
862 ## [2.6.3] - 2023-06-19
866 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
867 - Update strategies internals after statistics computation.
871 - Optimize O(1) queue implementation.
873 ## [2.6.2] - 2023-06-12
877 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
879 ## [2.6.1] - 2023-06-10
883 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
887 - Fix average statistics computation: ensure failed tasks are not accounted.
889 ## [2.6.0] - 2023-06-09
893 - Add `LEAST_ELU` worker choice strategy (experimental).
894 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
898 - Refactor pool worker node usage internals.
899 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
900 - Breaking change: pool information `info` property object fields have been renamed.
904 - Fix wait time accounting.
905 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
906 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
908 ## [2.5.4] - 2023-06-07
912 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
916 - Compute statistics at the worker level only if needed.
917 - Add `worker_threads` options to thread pool options.
921 - Make the `LEAST_BUSY` strategy only relies on task runtime.
923 ## [2.5.3] - 2023-06-04
927 - Refine pool information content.
928 - Limit pool internals public exposure.
930 ## [2.5.2] - 2023-06-02
934 - Add `taskError` pool event for task execution error.
935 - Add pool information `info` property to pool.
936 - Emit pool information on `busy` and `full` pool events.
938 ## [2.5.1] - 2023-06-01
942 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
943 - Add `error` pool event for uncaught worker error.
945 ## [2.5.0] - 2023-05-31
949 - Switch pool event emitter to `EventEmitterAsyncResource`.
950 - Add tasks wait time accounting in per worker tasks usage.
951 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
955 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
957 ## [2.4.14] - 2023-05-09
961 - Ensure no undefined task runtime can land in the tasks history.
962 - Fix median computation implementation once again.
966 - Unit tests for median and queue implementations.
968 ## [2.4.13] - 2023-05-08
972 - Fix worker choice strategy options validation.
973 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
975 ## [2.4.12] - 2023-05-06
979 - Support multiple task functions per worker.
980 - Add custom worker weights support to worker choice strategies options.
984 - Use O(1) queue implementation for tasks queueing.
988 - Fix median computation implementation.
989 - Fix fair share worker choice strategy internals update.
991 ## [2.4.11] - 2023-04-23
995 - Optimize free worker finding in worker choice strategies.
997 ## [2.4.10] - 2023-04-15
1001 - Fix typescript type definition for task function: ensure the input data is optional.
1002 - Fix typescript type definition for pool execute(): ensure the input data is optional.
1004 ## [2.4.9] - 2023-04-15
1008 - Add tasks queue enablement runtime setter to pool.
1009 - Add tasks queue options runtime setter to pool.
1010 - Add worker choice strategy options runtime setter to pool.
1014 - Remove the tasks queuing experimental status.
1018 - Fix task function type definition and validation.
1019 - Fix worker choice strategy options handling.
1021 ## [2.4.8] - 2023-04-12
1025 - Fix message between main worker and worker type definition for tasks.
1026 - Fix code documentation.
1028 ## [2.4.7] - 2023-04-11
1032 - Add worker tasks queue options to pool options.
1036 - Fix missing documentation.
1038 ## [2.4.6] - 2023-04-10
1042 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1043 - Properly count worker executing tasks with tasks queueing enabled.
1045 ## [2.4.5] - 2023-04-09
1049 - Use monotonic high resolution timer for worker tasks runtime.
1050 - Add worker tasks median runtime to statistics.
1051 - Add worker tasks queue (experimental).
1053 ## [2.4.4] - 2023-04-07
1057 - Add `PoolEvents` enumeration and `PoolEvent` type.
1061 - Destroy worker only on alive check.
1063 ## [2.4.3] - 2023-04-07
1067 - Fix typedoc generation with inheritance.
1069 ## [2.4.2] - 2023-04-06
1073 - Add `full` event to dynamic pool.
1074 - Keep worker choice strategy in memory for conditional reuse.
1078 - Fix possible negative worker key at worker removal in worker choice strategies.
1080 ## [2.4.1] - 2023-04-05
1084 - Optimize worker choice strategy for dynamic pool.
1088 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1090 ## [2.4.0] - 2023-04-04
1094 - Add `LESS_BUSY` worker choice strategy.
1098 - Optimize worker storage in pool.
1099 - Optimize worker alive status check.
1100 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1101 - Optimize `LESS_USED` worker choice strategy.
1102 - Update benchmark versus external threads pools.
1103 - Optimize tasks usage statistics requirements for worker choice strategy.
1107 - Ensure trimmable characters are checked at pool initialization.
1108 - Fix message id integer overflow.
1109 - Fix pool worker removal in worker choice strategy internals.
1110 - Fix package publication with pnpm.
1112 ## [2.4.0-3] - 2023-04-04
1116 - Add `LESS_BUSY` worker choice strategy.
1120 - Optimize worker storage in pool.
1121 - Optimize worker alive status check.
1122 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1123 - Optimize `LESS_USED` worker choice strategy.
1124 - Update benchmark versus external threads pools.
1128 - Ensure trimmable characters are checked at pool initialization.
1129 - Fix message id integer overflow.
1130 - Fix pool worker removal in worker choice strategy internals.
1131 - Fix package publication with pnpm.
1133 ## [2.4.0-2] - 2023-04-03
1137 - Add `LESS_BUSY` worker choice strategy.
1141 - Optimize worker storage in pool.
1142 - Optimize worker alive status check.
1143 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1144 - Optimize `LESS_USED` worker choice strategy.
1148 - Ensure trimmable characters are checked at pool initialization.
1149 - Fix message id integer overflow.
1150 - Fix pool worker removal in worker choice strategy internals.
1151 - Fix package publication with pnpm.
1153 ## [2.4.0-1] - 2023-04-03
1157 - Add `LESS_BUSY` worker choice strategy.
1161 - Optimize worker storage in pool.
1162 - Optimize worker alive status check.
1163 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1164 - Optimize `LESS_USED` worker choice strategy.
1168 - Ensure trimmable characters are checked at pool initialization.
1169 - Fix message id integer overflow.
1170 - Fix pool worker removal in worker choice strategy internals.
1172 ## [2.4.0-0] - 2023-04-03
1176 - Add `LESS_BUSY` worker choice strategy.
1180 - Optimize worker storage in pool.
1181 - Optimize worker alive status check.
1182 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1183 - Optimize `LESS_USED` worker choice strategy.
1187 - Ensure trimmable characters are checked at pool initialization.
1188 - Fix message id integer overflow.
1189 - Fix pool worker removal in worker choice strategy internals.
1191 ## [2.3.10] - 2023-03-18
1195 - Fix package.json `exports` syntax for ESM and CommonJS.
1199 - Permit SemVer pre-release publication.
1201 ## [2.3.10-2] - 2023-03-18
1205 - Fix package.json `exports` syntax for ESM and CommonJS.
1207 ## [2.3.10-1] - 2023-03-18
1211 - Permit SemVer pre-release publication.
1213 ## [2.3.10-0] - 2023-03-18
1217 - Fix package.json `exports` syntax for ESM and CommonJS.
1219 ## [2.3.9] - 2023-03-18
1223 - Introduce ESM module support along with CommonJS one.
1227 - Fix brown paper bag bug referencing the same object literal.
1229 ## [2.3.8] - 2023-03-18
1233 - Switch internal benchmarking code to benny.
1234 - Switch to TypeScript 5.x.x.
1235 - Switch rollup bundler plugins to core ones.
1236 - Switch to TSDoc syntax.
1237 - Enforce conventional commits.
1241 - Fix random integer generator.
1242 - Fix worker choice strategy pool type identification at initialization.
1244 ## [2.3.7] - 2022-10-23
1248 - Switch to open collective FOSS project funding platform.
1249 - Switch to ts-standard linter configuration on TypeScript code.
1253 - Fixed missing async on pool execute method.
1254 - Fixed typing in TypeScript example.
1255 - Fixed types in unit tests.
1257 ## [2.3.6] - 2022-10-22
1261 - Cleanup pool attributes and methods.
1262 - Refine error types thrown.
1266 - Fix continuous integration build on windows.
1267 - Fix code coverage reporting by using c8 instead of nyc.
1269 ## [2.3.5] - 2022-10-21
1273 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1274 - Optimize tasks usage lookup implementation.
1278 - Fix missed pool event emitter type export.
1279 - Fix typedoc documentation generation.
1281 ## [2.3.4] - 2022-10-17
1285 - Fully automate release process with release-it.
1289 - Optimize fair share task scheduling algorithm implementation.
1290 - Update benchmark versus external pools results with latest version.
1292 ## [2.3.3] - 2022-10-15
1296 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1298 ## [2.3.2] - 2022-10-14
1302 - Optimize fair share worker selection strategy implementation.
1306 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1308 ## [2.3.1] - 2022-10-13
1312 - Pool worker choice strategies:
1313 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1314 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1316 ## [2.2.2] - 2022-10-09
1320 - Fixed `README.md` file.
1322 ## [2.2.1] - 2022-10-08
1326 - Dynamic worker choice strategy change at runtime.
1328 ## [2.2.0] - 2022-01-05
1330 ### Breaking Changes
1332 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1334 ## [2.1.0] - 2021-08-29
1338 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1340 ### Breaking Changes
1342 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1343 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1344 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1345 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1347 ## [2.0.2] - 2021-05-12
1351 - Fix `busy` event emission on fixed pool type
1353 ## [2.0.1] - 2021-03-16
1357 - Check if pool options are properly set.
1358 - `busy` event is emitted on all pool types.
1360 ## [2.0.0] - 2021-03-01
1364 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1366 ### Breaking Changes
1368 - `FullPool` event is now renamed to `busy`.
1369 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1370 _Find more details on our JSDoc._
1372 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1374 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1376 ### Pool options types declaration merge
1378 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1380 #### New `export` strategy
1384 const DynamicThreadPool = require('poolifier/lib/dynamic')
1386 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1389 But you should always prefer just using
1392 const { DynamicThreadPool } = require('poolifier')
1395 #### New type definitions for input data and response
1397 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1398 _This is not a limitation by poolifier but Node.js._
1400 #### Public property replacements
1402 `numWorkers` property is now `numberOfWorkers`
1404 #### Internal (protected) properties and methods renaming
1406 These properties are not intended for end users
1408 - `id` => `nextMessageId`
1410 These methods are not intended for end users
1412 - `_chooseWorker` => `chooseWorker`
1413 - `_newWorker` => `createWorker`
1414 - `_execute` => `internalExecute`
1415 - `_chooseWorker` => `chooseWorker`
1416 - `_checkAlive` => `checkAlive`
1418 - `_runAsync` => `runAsync`
1420 ## [1.1.0] - 2020-05-21
1424 - ThreadWorker support async functions as option
1425 - Various external library patches
1427 ## [1.0.0] - 2020-01-24
1431 - FixedThreadPool implementation
1432 - DynamicThreadPool implementation
1433 - WorkerThread implementation to improve developer experience