3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
12 - Add mapExecute() helper to execute a task function on an iterable data's input.
14 ## [4.0.13] - 2024-05-29
18 - Optimize tasks queue implementation.
19 - Enable prioritized tasks queueing only when necessary.
21 ## [4.0.12] - 2024-05-25
25 - Optimize circular buffer implementation to store task execution measurements.
27 ## [4.0.11] - 2024-05-21
31 - Switch to optimized circular buffer implementation to store task execution measurements.
33 ## [4.0.10] - 2024-05-20
37 - Ensure tasks stealing dynamic worker node is not destroyed on inactivity.
39 ## [4.0.9] - 2024-05-19
43 - Add ELU `utilization` statistics to pool information.
45 ## [4.0.8] - 2024-05-15
49 - Fix default task function worker choice strategy and priority handling.
51 ## [4.0.7] - 2024-05-13
55 - Add ELU statistics to pool information.
57 ## [4.0.6] - 2024-05-10
61 - Fix pools' `addTaskFunction()` type definition.
63 ## [4.0.5] - 2024-05-09
67 - Avoid queued tasks redistribution on the errored worker node.
69 ## [4.0.4] - 2024-05-08
73 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
75 ## [4.0.3] - 2024-05-08
79 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
81 ## [4.0.2] - 2024-05-06
85 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
87 ## [4.0.1] - 2024-05-02
91 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
92 - 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.
94 ## [4.0.0] - 2024-04-30
98 - 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 }`.
99 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
100 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
101 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
105 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
107 ## [3.1.30] - 2024-04-22
111 - Fix `transferList` argument type definition.
113 ## [3.1.29] - 2024-04-02
117 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
119 ## [3.1.28] - 2024-04-01
123 - Ensure the minimum number of workers on a started pool is guaranteed.
125 ## [3.1.27] - 2024-03-27
129 - Fix publishing on JSR, take 4.
131 ## [3.1.26] - 2024-03-27
135 - Fix publishing on JSR, take 3.
137 ## [3.1.25] - 2024-03-27
141 - Fix publishing on JSR, take 2.
143 ## [3.1.24] - 2024-03-27
147 - Fix publishing on JSR.
149 ## [3.1.23] - 2024-03-27
155 ## [3.1.22] - 2024-03-15
159 - Fix pool event emitter registered callbacks removal at `destroy()`.
161 ## [3.1.21] - 2024-02-22
165 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
167 ## [3.1.20] - 2024-02-11
171 - Ensure `worker_threads` workers are unreferenced at termination.
173 ## [3.1.19] - 2024-01-16
177 - Fix possible null exception at task finishing handling.
181 - Optimize Deque implementation to improve tasks queueing performance.
183 ## [3.1.18] - 2024-01-06
187 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
189 ## [3.1.17] - 2024-01-05
193 - Improve performance by clean up unneeded condition checks on hot code paths.
195 ## [3.1.16] - 2024-01-03
199 - Add missing type to TS type definitions.
201 ## [3.1.15] - 2024-01-02
205 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
207 ## [3.1.15-0] - 2024-01-02
211 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
213 ## [3.1.14] - 2024-01-01
217 - Properly handle dynamic pool with zero minimum size.
219 ## [3.1.13] - 2023-12-30
223 - Reduce branching in several hot code paths.
224 - Use faster object cloning implementation.
226 ## [3.1.12] - 2023-12-27
230 - Fix tasks redistribution triggers at pool destroying.
234 - Switch TypeScript module resolution to Node16.
236 ## [3.1.12-0] - 2023-12-27
240 - Fix tasks redistribution triggers at pool destroying.
242 ## [3.1.11] - 2023-12-24
246 - Avoid worker node cross tasks stealing.
247 - Ensure only half the pool worker nodes can steal tasks.
249 ## [3.1.10] - 2023-12-23
253 - Avoid useless branching on pool type.
255 ## [3.1.9] - 2023-12-22
259 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
261 ## [3.1.8] - 2023-12-21
265 - Fix default worker weight computation.
266 - Fix possible null exception at pool destroying.
268 ## [3.1.7] - 2023-12-20
272 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
274 ## [3.1.6] - 2023-12-18
278 - Fix pool destroying with tasks queuing enabled.
280 ## [3.1.5] - 2023-12-18
284 - Add queued tasks end timeout support to worker node termination.
286 ## [3.1.4] - 2023-12-18
290 - Make more robust the fix for possible null exception at handling task execution response.
292 ## [3.1.3] - 2023-12-17
296 - Fix possible null exception at handling task execution response.
298 ## [3.1.2] - 2023-12-17
302 - Wait for queued tasks to end at worker node termination.
304 ## [3.1.1] - 2023-12-16
308 - Fix pool options TS type definition.
310 ## [3.1.0] - 2023-12-16
314 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
316 ## [3.0.14] - 2023-12-13
320 - Fix possible null exception with worker_threads pools.
322 ## [3.0.13] - 2023-12-12
326 - Ensure worker choice strategy wait for worker nodes readiness.
330 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
332 ## [3.0.12] - 2023-12-12
336 - Add infinite retries support in worker choice strategy.
338 ## [3.0.11] - 2023-12-11
342 - Ensure pool asynchronous resource properly track tasks execution.
344 ## [3.0.10] - 2023-12-08
348 - Add a fastpath when tasks stealing or redistribution is impossible.
350 ## [3.0.9] - 2023-11-26
354 - Remove all pool events listener at pool destroying.
355 - Remove all worker node events listener at worker node destroying.
356 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
358 ## [3.0.8] - 2023-11-25
362 - Ensure continuous tasks stealing on idle start at worker node idling.
364 ## [3.0.7] - 2023-11-24
368 - Make continuous tasks stealing start at worker node idling.
370 ## [3.0.6] - 2023-11-24
374 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
375 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
377 ## [3.0.5] - 2023-10-27
381 - Ensure pool `ready` event can be emitted only once.
383 ## [3.0.4] - 2023-10-20
387 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
388 - Use builtin retry mechanism in worker choice strategies instead of custom one.
390 ## [3.0.3] - 2023-10-19
394 - Avoid null exception at sending message to worker.
395 - Avoid null exception at checking worker node readiness.
397 ## [3.0.2] - 2023-10-17
401 - 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).
403 ## [3.0.1] - 2023-10-16
407 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
411 - Switch the worker node eventing code to `EventTarget` API.
413 ## [3.0.0] - 2023-10-08
417 - Remove Node.js 16.x.x (EOL) support.
419 ## [2.7.5] - 2023-10-03
423 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
425 ## [2.7.4] - 2023-09-25
429 - Fix source maps (bundler issue).
431 ## [2.7.3] - 2023-09-24
435 - Convert pool event emitter to event emitter async resource.
437 ## [2.7.2] - 2023-09-23
441 - Add source maps to npm package to ease debugging.
445 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
447 ## [2.7.1] - 2023-09-20
451 - Ensure worker message listener used one time are removed after usage.
453 ## [2.7.0] - 2023-09-19
457 - Fix task stealing related tasks queue options handling at runtime.
461 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
465 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
466 - Stricter worker constructor arguments validation.
468 ## [2.6.45] - 2023-09-17
472 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
476 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
477 - Add `start()` method to pool API to start the minimum number of workers.
478 - 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.
479 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
481 ## [2.6.44] - 2023-09-08
485 - Use a dedicated PAT to publish on GitHub packages registry.
489 - Publish on GitHub packages registry on release.
493 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
495 ## [2.6.43] - 2023-09-08
499 - Publish on GitHub packages registry on release.
503 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
505 ## [2.6.42] - 2023-09-06
509 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
511 ## [2.6.41] - 2023-09-03
515 - Optimize worker choice strategies implementation.
517 ## [2.6.40] - 2023-09-01
521 - Do not pre-choose in WRR worker choice strategy to avoid bias.
522 - Avoid array out of bound in worker choice strategies after worker node removal.
524 ## [2.6.39] - 2023-08-30
528 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
530 ## [2.6.38] - 2023-08-30
534 - Bundle typescript types declaration into one file.
538 - Improve interleaved weighted round robin worker choice strategy implementation.
540 ## [2.6.37] - 2023-08-28
544 - Ensure unused worker usage statistics are deleted at runtime.
548 - Rename worker choice strategy options `choiceRetries` to `retries`.
549 - Avoid unnecessary branching in worker choice strategies.
551 ## [2.6.36] - 2023-08-27
555 - Fix pool `execute()` arguments check.
559 - Make continuous tasks stealing algorithm less aggressive.
560 - Fine tune tasks stealing algorithm under back pressure.
562 ## [2.6.35] - 2023-08-25
566 - Don't account worker usage statistics for tasks that have failed.
567 - Fix pool information runtime and wait time median computation.
571 - Update simple moving average implementation to use a circular buffer.
572 - Update simple moving median implementation to use a circular buffer.
573 - Account for stolen tasks in worker usage statistics and pool information.
577 - Continuous tasks stealing algorithm.
579 ## [2.6.34] - 2023-08-24
583 - Avoid cascading tasks stealing under back pressure.
587 - Add fastpath to queued tasks rescheduling.
589 ## [2.6.33] - 2023-08-24
593 - Fix queued tasks rescheduling.
597 - Rename tasks queue options `queueMaxSize` to `size`.
601 - Task stealing scheduling algorithm if tasks queueing is enabled.
603 ## [2.6.32] - 2023-08-23
607 - Ensure no task can be executed when the pool is destroyed.
611 - Add `queueMaxSize` option to tasks queue options.
612 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
613 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
615 ## [2.6.31] - 2023-08-20
619 - Fix worker choice strategy retries mechanism in some edge cases.
623 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
624 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
626 ## [2.6.30] - 2023-08-19
630 - Ensure pool event `backPressure` is emitted.
631 - Ensure pool event `full` is emitted only once.
632 - Ensure worker node cannot be instantiated without proper arguments.
634 ## [2.6.29] - 2023-08-18
638 - Fix race condition between readiness and task functions worker message handling at startup.
639 - Fix duplicate task function worker usage statistics computation per task function.
640 - Update task function worker usage statistics if and only if there's at least two different task functions.
641 - Fix race condition at task function worker usage executing task computation leading to negative value.
645 - 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).
646 - Use back pressure detection in worker choice strategies.
647 - Add worker choice strategies retries mechanism if no worker is eligible.
649 ## [2.6.28] - 2023-08-16
653 - Ensure pool workers are properly initialized.
657 - HTTP server pool examples: express-cluster, express-hybrid.
661 - Remove now useless branching in worker hot code path.
663 ## [2.6.27] - 2023-08-15
667 - Add `KillHandler` type definition to exported types.
671 - Add `destroy` event to pool API.
673 ## [2.6.26] - 2023-08-15
677 - Add kill handler to worker options allowing to execute custom code when worker is killed.
678 - Add `listTaskFunctions()` method to pool API.
679 - SMTP client pool example: nodemailer.
681 ## [2.6.25] - 2023-08-13
685 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
686 - WebSocket server pool examples: ws-cluster, ws-hybrid.
688 ## [2.6.24] - 2023-08-12
692 - Add array of transferable objects to the `execute()` method arguments.
693 - WebSocket server pool examples: ws-worker_threads.
695 ## [2.6.23] - 2023-08-11
699 - 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.
703 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
704 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
706 ## [2.6.22] - 2023-08-10
710 - Add missing `types` field to package.json `exports`.
714 - Structure markdown documentation (PR #811).
716 ## [2.6.21] - 2023-08-03
720 - Improve code documentation.
721 - Code refactoring and cleanup for better maintainability and readability.
723 ## [2.6.20] - 2023-07-21
727 - Fix queued tasks redistribution on error task execution starvation.
728 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
732 - Drastically reduce lookups by worker in the worker nodes.
734 ## [2.6.19] - 2023-07-20
738 - Dedicated internal communication channel for worker_threads pools.
740 ## [2.6.18] - 2023-07-19
744 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
746 ## [2.6.17] - 2023-07-16
750 - Add `listTaskFunctions()` method to worker API.
752 ## [2.6.16] - 2023-07-12
756 - Fix pool startup detection.
757 - Fix worker task functions handling.
759 ## [2.6.15] - 2023-07-11
763 - Take into account worker node readiness in worker choice strategies.
765 ## [2.6.14] - 2023-07-10
769 - Fix task function statistics tracking.
771 ## [2.6.13] - 2023-07-10
775 - Add per task function statistics tracking.
776 - Add public methods to manipulate the worker task functions at runtime.
778 ## [2.6.12] - 2023-07-09
782 - Workaround import issue with `node:os` module in node 16.x.x.
784 ## [2.6.11] - 2023-07-09
788 - Fix pool readiness semantic.
790 ## [2.6.10] - 2023-07-08
794 - Ensure workers are not recreated on error at pool startup.
798 - Add `ready` and `strategy` fields to pool information.
799 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
800 - Add dynamic pool sizing checks.
802 ## [2.6.9] - 2023-07-07
806 - Recreate the right worker type on uncaught exception.
810 - Add minimum and maximum to internal measurement statistics.
811 - Add `runTime` and `waitTime` to pool information.
812 - Check worker inactive time only on dynamic worker.
814 ## [2.6.8] - 2023-07-03
818 - Brown paper bag release to fix version handling in pool information.
820 ## [2.6.7] - 2023-07-03
824 - Ensure worker queued tasks at error are reassigned to other pool workers.
828 - Add pool `utilization` ratio to pool information.
829 - Add `version` to pool information.
830 - Add worker information to worker nodes.
832 ## [2.6.6] - 2023-07-01
836 - Add safe helper `availableParallelism()` to help sizing the pool.
840 - Ensure message handler is only registered in worker.
842 ## [2.6.5] - 2023-06-27
846 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
850 - Artificial version bump to 2.6.5 to workaround publication issue.
851 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
852 - Ensure pool event is emitted before task error promise rejection.
853 - Fix queued tasks count computation.
857 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
859 ## [2.6.4] - 2023-06-27
863 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
867 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
868 - Ensure pool event is emitted before task error promise rejection.
869 - Fix queued tasks count computation.
873 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
875 ## [2.6.3] - 2023-06-19
879 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
880 - Update strategies internals after statistics computation.
884 - Optimize O(1) queue implementation.
886 ## [2.6.2] - 2023-06-12
890 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
892 ## [2.6.1] - 2023-06-10
896 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
900 - Fix average statistics computation: ensure failed tasks are not accounted.
902 ## [2.6.0] - 2023-06-09
906 - Add `LEAST_ELU` worker choice strategy (experimental).
907 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
911 - Refactor pool worker node usage internals.
912 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
913 - Breaking change: pool information `info` property object fields have been renamed.
917 - Fix wait time accounting.
918 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
919 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
921 ## [2.5.4] - 2023-06-07
925 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
929 - Compute statistics at the worker level only if needed.
930 - Add `worker_threads` options to thread pool options.
934 - Make the `LEAST_BUSY` strategy only relies on task runtime.
936 ## [2.5.3] - 2023-06-04
940 - Refine pool information content.
941 - Limit pool internals public exposure.
943 ## [2.5.2] - 2023-06-02
947 - Add `taskError` pool event for task execution error.
948 - Add pool information `info` property to pool.
949 - Emit pool information on `busy` and `full` pool events.
951 ## [2.5.1] - 2023-06-01
955 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
956 - Add `error` pool event for uncaught worker error.
958 ## [2.5.0] - 2023-05-31
962 - Switch pool event emitter to `EventEmitterAsyncResource`.
963 - Add tasks wait time accounting in per worker tasks usage.
964 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
968 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
970 ## [2.4.14] - 2023-05-09
974 - Ensure no undefined task runtime can land in the tasks history.
975 - Fix median computation implementation once again.
979 - Unit tests for median and queue implementations.
981 ## [2.4.13] - 2023-05-08
985 - Fix worker choice strategy options validation.
986 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
988 ## [2.4.12] - 2023-05-06
992 - Support multiple task functions per worker.
993 - Add custom worker weights support to worker choice strategies options.
997 - Use O(1) queue implementation for tasks queueing.
1001 - Fix median computation implementation.
1002 - Fix fair share worker choice strategy internals update.
1004 ## [2.4.11] - 2023-04-23
1008 - Optimize free worker finding in worker choice strategies.
1010 ## [2.4.10] - 2023-04-15
1014 - Fix typescript type definition for task function: ensure the input data is optional.
1015 - Fix typescript type definition for pool execute(): ensure the input data is optional.
1017 ## [2.4.9] - 2023-04-15
1021 - Add tasks queue enablement runtime setter to pool.
1022 - Add tasks queue options runtime setter to pool.
1023 - Add worker choice strategy options runtime setter to pool.
1027 - Remove the tasks queuing experimental status.
1031 - Fix task function type definition and validation.
1032 - Fix worker choice strategy options handling.
1034 ## [2.4.8] - 2023-04-12
1038 - Fix message between main worker and worker type definition for tasks.
1039 - Fix code documentation.
1041 ## [2.4.7] - 2023-04-11
1045 - Add worker tasks queue options to pool options.
1049 - Fix missing documentation.
1051 ## [2.4.6] - 2023-04-10
1055 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1056 - Properly count worker executing tasks with tasks queueing enabled.
1058 ## [2.4.5] - 2023-04-09
1062 - Use monotonic high resolution timer for worker tasks runtime.
1063 - Add worker tasks median runtime to statistics.
1064 - Add worker tasks queue (experimental).
1066 ## [2.4.4] - 2023-04-07
1070 - Add `PoolEvents` enumeration and `PoolEvent` type.
1074 - Destroy worker only on alive check.
1076 ## [2.4.3] - 2023-04-07
1080 - Fix typedoc generation with inheritance.
1082 ## [2.4.2] - 2023-04-06
1086 - Add `full` event to dynamic pool.
1087 - Keep worker choice strategy in memory for conditional reuse.
1091 - Fix possible negative worker key at worker removal in worker choice strategies.
1093 ## [2.4.1] - 2023-04-05
1097 - Optimize worker choice strategy for dynamic pool.
1101 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1103 ## [2.4.0] - 2023-04-04
1107 - Add `LESS_BUSY` worker choice strategy.
1111 - Optimize worker storage in pool.
1112 - Optimize worker alive status check.
1113 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1114 - Optimize `LESS_USED` worker choice strategy.
1115 - Update benchmark versus external threads pools.
1116 - Optimize tasks usage statistics requirements for worker choice strategy.
1120 - Ensure trimmable characters are checked at pool initialization.
1121 - Fix message id integer overflow.
1122 - Fix pool worker removal in worker choice strategy internals.
1123 - Fix package publication with pnpm.
1125 ## [2.4.0-3] - 2023-04-04
1129 - Add `LESS_BUSY` worker choice strategy.
1133 - Optimize worker storage in pool.
1134 - Optimize worker alive status check.
1135 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1136 - Optimize `LESS_USED` worker choice strategy.
1137 - Update benchmark versus external threads pools.
1141 - Ensure trimmable characters are checked at pool initialization.
1142 - Fix message id integer overflow.
1143 - Fix pool worker removal in worker choice strategy internals.
1144 - Fix package publication with pnpm.
1146 ## [2.4.0-2] - 2023-04-03
1150 - Add `LESS_BUSY` worker choice strategy.
1154 - Optimize worker storage in pool.
1155 - Optimize worker alive status check.
1156 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1157 - Optimize `LESS_USED` worker choice strategy.
1161 - Ensure trimmable characters are checked at pool initialization.
1162 - Fix message id integer overflow.
1163 - Fix pool worker removal in worker choice strategy internals.
1164 - Fix package publication with pnpm.
1166 ## [2.4.0-1] - 2023-04-03
1170 - Add `LESS_BUSY` worker choice strategy.
1174 - Optimize worker storage in pool.
1175 - Optimize worker alive status check.
1176 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1177 - Optimize `LESS_USED` worker choice strategy.
1181 - Ensure trimmable characters are checked at pool initialization.
1182 - Fix message id integer overflow.
1183 - Fix pool worker removal in worker choice strategy internals.
1185 ## [2.4.0-0] - 2023-04-03
1189 - Add `LESS_BUSY` worker choice strategy.
1193 - Optimize worker storage in pool.
1194 - Optimize worker alive status check.
1195 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1196 - Optimize `LESS_USED` worker choice strategy.
1200 - Ensure trimmable characters are checked at pool initialization.
1201 - Fix message id integer overflow.
1202 - Fix pool worker removal in worker choice strategy internals.
1204 ## [2.3.10] - 2023-03-18
1208 - Fix package.json `exports` syntax for ESM and CommonJS.
1212 - Permit SemVer pre-release publication.
1214 ## [2.3.10-2] - 2023-03-18
1218 - Fix package.json `exports` syntax for ESM and CommonJS.
1220 ## [2.3.10-1] - 2023-03-18
1224 - Permit SemVer pre-release publication.
1226 ## [2.3.10-0] - 2023-03-18
1230 - Fix package.json `exports` syntax for ESM and CommonJS.
1232 ## [2.3.9] - 2023-03-18
1236 - Introduce ESM module support along with CommonJS one.
1240 - Fix brown paper bag bug referencing the same object literal.
1242 ## [2.3.8] - 2023-03-18
1246 - Switch internal benchmarking code to benny.
1247 - Switch to TypeScript 5.x.x.
1248 - Switch rollup bundler plugins to core ones.
1249 - Switch to TSDoc syntax.
1250 - Enforce conventional commits.
1254 - Fix random integer generator.
1255 - Fix worker choice strategy pool type identification at initialization.
1257 ## [2.3.7] - 2022-10-23
1261 - Switch to open collective FOSS project funding platform.
1262 - Switch to ts-standard linter configuration on TypeScript code.
1266 - Fixed missing async on pool execute method.
1267 - Fixed typing in TypeScript example.
1268 - Fixed types in unit tests.
1270 ## [2.3.6] - 2022-10-22
1274 - Cleanup pool attributes and methods.
1275 - Refine error types thrown.
1279 - Fix continuous integration build on windows.
1280 - Fix code coverage reporting by using c8 instead of nyc.
1282 ## [2.3.5] - 2022-10-21
1286 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1287 - Optimize tasks usage lookup implementation.
1291 - Fix missed pool event emitter type export.
1292 - Fix typedoc documentation generation.
1294 ## [2.3.4] - 2022-10-17
1298 - Fully automate release process with release-it.
1302 - Optimize fair share task scheduling algorithm implementation.
1303 - Update benchmark versus external pools results with latest version.
1305 ## [2.3.3] - 2022-10-15
1309 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1311 ## [2.3.2] - 2022-10-14
1315 - Optimize fair share worker selection strategy implementation.
1319 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1321 ## [2.3.1] - 2022-10-13
1325 - Pool worker choice strategies:
1326 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1327 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1329 ## [2.2.2] - 2022-10-09
1333 - Fixed `README.md` file.
1335 ## [2.2.1] - 2022-10-08
1339 - Dynamic worker choice strategy change at runtime.
1341 ## [2.2.0] - 2022-01-05
1343 ### Breaking Changes
1345 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1347 ## [2.1.0] - 2021-08-29
1351 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1353 ### Breaking Changes
1355 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1356 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1357 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1358 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1360 ## [2.0.2] - 2021-05-12
1364 - Fix `busy` event emission on fixed pool type
1366 ## [2.0.1] - 2021-03-16
1370 - Check if pool options are properly set.
1371 - `busy` event is emitted on all pool types.
1373 ## [2.0.0] - 2021-03-01
1377 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1379 ### Breaking Changes
1381 - `FullPool` event is now renamed to `busy`.
1382 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1383 _Find more details on our JSDoc._
1385 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1387 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1389 ### Pool options types declaration merge
1391 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1393 #### New `export` strategy
1397 const DynamicThreadPool = require('poolifier/lib/dynamic')
1399 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1402 But you should always prefer just using
1405 const { DynamicThreadPool } = require('poolifier')
1408 #### New type definitions for input data and response
1410 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1411 _This is not a limitation by poolifier but Node.js._
1413 #### Public property replacements
1415 `numWorkers` property is now `numberOfWorkers`
1417 #### Internal (protected) properties and methods renaming
1419 These properties are not intended for end users
1421 - `id` => `nextMessageId`
1423 These methods are not intended for end users
1425 - `_chooseWorker` => `chooseWorker`
1426 - `_newWorker` => `createWorker`
1427 - `_execute` => `internalExecute`
1428 - `_chooseWorker` => `chooseWorker`
1429 - `_checkAlive` => `checkAlive`
1431 - `_runAsync` => `runAsync`
1433 ## [1.1.0] - 2020-05-21
1437 - ThreadWorker support async functions as option
1438 - Various external library patches
1440 ## [1.0.0] - 2020-01-24
1444 - FixedThreadPool implementation
1445 - DynamicThreadPool implementation
1446 - WorkerThread implementation to improve developer experience