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 task(s) stealing by dequeuing task(s) from the last prioritized bucket.
14 ## [4.0.2] - 2024-05-06
18 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
20 ## [4.0.1] - 2024-05-02
24 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
25 - 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.
27 ## [4.0.0] - 2024-04-30
31 - 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 }`.
32 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
33 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
34 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
38 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
40 ## [3.1.30] - 2024-04-22
44 - Fix `transferList` argument type definition.
46 ## [3.1.29] - 2024-04-02
50 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
52 ## [3.1.28] - 2024-04-01
56 - Ensure the minimum number of workers on a started pool is guaranteed.
58 ## [3.1.27] - 2024-03-27
62 - Fix publishing on JSR, take 4.
64 ## [3.1.26] - 2024-03-27
68 - Fix publishing on JSR, take 3.
70 ## [3.1.25] - 2024-03-27
74 - Fix publishing on JSR, take 2.
76 ## [3.1.24] - 2024-03-27
80 - Fix publishing on JSR.
82 ## [3.1.23] - 2024-03-27
88 ## [3.1.22] - 2024-03-15
92 - Fix pool event emitter registered callbacks removal at `destroy()`.
94 ## [3.1.21] - 2024-02-22
98 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
100 ## [3.1.20] - 2024-02-11
104 - Ensure `worker_threads` workers are unreferenced at termination.
106 ## [3.1.19] - 2024-01-16
110 - Fix possible null exception at task finishing handling.
114 - Optimize Deque implementation to improve tasks queueing performance.
116 ## [3.1.18] - 2024-01-06
120 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
122 ## [3.1.17] - 2024-01-05
126 - Improve performance by clean up unneeded condition checks on hot code paths.
128 ## [3.1.16] - 2024-01-03
132 - Add missing type to TS type definitions.
134 ## [3.1.15] - 2024-01-02
138 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
140 ## [3.1.15-0] - 2024-01-02
144 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
146 ## [3.1.14] - 2024-01-01
150 - Properly handle dynamic pool with zero minimum size.
152 ## [3.1.13] - 2023-12-30
156 - Reduce branching in several hot code paths.
157 - Use faster object cloning implementation.
159 ## [3.1.12] - 2023-12-27
163 - Fix tasks redistribution triggers at pool destroying.
167 - Switch TypeScript module resolution to Node16.
169 ## [3.1.12-0] - 2023-12-27
173 - Fix tasks redistribution triggers at pool destroying.
175 ## [3.1.11] - 2023-12-24
179 - Avoid worker node cross tasks stealing.
180 - Ensure only half the pool worker nodes can steal tasks.
182 ## [3.1.10] - 2023-12-23
186 - Avoid useless branching on pool type.
188 ## [3.1.9] - 2023-12-22
192 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
194 ## [3.1.8] - 2023-12-21
198 - Fix default worker weight computation.
199 - Fix possible null exception at pool destroying.
201 ## [3.1.7] - 2023-12-20
205 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
207 ## [3.1.6] - 2023-12-18
211 - Fix pool destroying with tasks queuing enabled.
213 ## [3.1.5] - 2023-12-18
217 - Add queued tasks end timeout support to worker node termination.
219 ## [3.1.4] - 2023-12-18
223 - Make more robust the fix for possible null exception at handling task execution response.
225 ## [3.1.3] - 2023-12-17
229 - Fix possible null exception at handling task execution response.
231 ## [3.1.2] - 2023-12-17
235 - Wait for queued tasks to end at worker node termination.
237 ## [3.1.1] - 2023-12-16
241 - Fix pool options TS type definition.
243 ## [3.1.0] - 2023-12-16
247 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
249 ## [3.0.14] - 2023-12-13
253 - Fix possible null exception with worker_threads pools.
255 ## [3.0.13] - 2023-12-12
259 - Ensure worker choice strategy wait for worker nodes readiness.
263 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
265 ## [3.0.12] - 2023-12-12
269 - Add infinite retries support in worker choice strategy.
271 ## [3.0.11] - 2023-12-11
275 - Ensure pool asynchronous resource properly track tasks execution.
277 ## [3.0.10] - 2023-12-08
281 - Add a fastpath when tasks stealing or redistribution is impossible.
283 ## [3.0.9] - 2023-11-26
287 - Remove all pool events listener at pool destroying.
288 - Remove all worker node events listener at worker node destroying.
289 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
291 ## [3.0.8] - 2023-11-25
295 - Ensure continuous tasks stealing on idle start at worker node idling.
297 ## [3.0.7] - 2023-11-24
301 - Make continuous tasks stealing start at worker node idling.
303 ## [3.0.6] - 2023-11-24
307 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
308 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
310 ## [3.0.5] - 2023-10-27
314 - Ensure pool `ready` event can be emitted only once.
316 ## [3.0.4] - 2023-10-20
320 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
321 - Use builtin retry mechanism in worker choice strategies instead of custom one.
323 ## [3.0.3] - 2023-10-19
327 - Avoid null exception at sending message to worker.
328 - Avoid null exception at checking worker node readiness.
330 ## [3.0.2] - 2023-10-17
334 - 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).
336 ## [3.0.1] - 2023-10-16
340 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
344 - Switch the worker node eventing code to `EventTarget` API.
346 ## [3.0.0] - 2023-10-08
350 - Remove Node.js 16.x.x (EOL) support.
352 ## [2.7.5] - 2023-10-03
356 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
358 ## [2.7.4] - 2023-09-25
362 - Fix source maps (bundler issue).
364 ## [2.7.3] - 2023-09-24
368 - Convert pool event emitter to event emitter async resource.
370 ## [2.7.2] - 2023-09-23
374 - Add source maps to npm package to ease debugging.
378 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
380 ## [2.7.1] - 2023-09-20
384 - Ensure worker message listener used one time are removed after usage.
386 ## [2.7.0] - 2023-09-19
390 - Fix task stealing related tasks queue options handling at runtime.
394 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
398 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
399 - Stricter worker constructor arguments validation.
401 ## [2.6.45] - 2023-09-17
405 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
409 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
410 - Add `start()` method to pool API to start the minimum number of workers.
411 - Add `taskStealing` and `tasksStealingOnPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
412 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
414 ## [2.6.44] - 2023-09-08
418 - Use a dedicated PAT to publish on GitHub packages registry.
422 - Publish on GitHub packages registry on release.
426 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
428 ## [2.6.43] - 2023-09-08
432 - Publish on GitHub packages registry on release.
436 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
438 ## [2.6.42] - 2023-09-06
442 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
444 ## [2.6.41] - 2023-09-03
448 - Optimize worker choice strategies implementation.
450 ## [2.6.40] - 2023-09-01
454 - Do not pre-choose in WRR worker choice strategy to avoid bias.
455 - Avoid array out of bound in worker choice strategies after worker node removal.
457 ## [2.6.39] - 2023-08-30
461 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
463 ## [2.6.38] - 2023-08-30
467 - Bundle typescript types declaration into one file.
471 - Improve interleaved weighted round robin worker choice strategy implementation.
473 ## [2.6.37] - 2023-08-28
477 - Ensure unused worker usage statistics are deleted at runtime.
481 - Rename worker choice strategy options `choiceRetries` to `retries`.
482 - Avoid unnecessary branching in worker choice strategies.
484 ## [2.6.36] - 2023-08-27
488 - Fix pool `execute()` arguments check.
492 - Make continuous tasks stealing algorithm less aggressive.
493 - Fine tune tasks stealing algorithm under back pressure.
495 ## [2.6.35] - 2023-08-25
499 - Don't account worker usage statistics for tasks that have failed.
500 - Fix pool information runtime and wait time median computation.
504 - Update simple moving average implementation to use a circular buffer.
505 - Update simple moving median implementation to use a circular buffer.
506 - Account for stolen tasks in worker usage statistics and pool information.
510 - Continuous tasks stealing algorithm.
512 ## [2.6.34] - 2023-08-24
516 - Avoid cascading tasks stealing under back pressure.
520 - Add fastpath to queued tasks rescheduling.
522 ## [2.6.33] - 2023-08-24
526 - Fix queued tasks rescheduling.
530 - Rename tasks queue options `queueMaxSize` to `size`.
534 - Task stealing scheduling algorithm if tasks queueing is enabled.
536 ## [2.6.32] - 2023-08-23
540 - Ensure no task can be executed when the pool is destroyed.
544 - Add `queueMaxSize` option to tasks queue options.
545 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
546 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
548 ## [2.6.31] - 2023-08-20
552 - Fix worker choice strategy retries mechanism in some edge cases.
556 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
557 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
559 ## [2.6.30] - 2023-08-19
563 - Ensure pool event `backPressure` is emitted.
564 - Ensure pool event `full` is emitted only once.
565 - Ensure worker node cannot be instantiated without proper arguments.
567 ## [2.6.29] - 2023-08-18
571 - Fix race condition between readiness and task functions worker message handling at startup.
572 - Fix duplicate task function worker usage statistics computation per task function.
573 - Update task function worker usage statistics if and only if there's at least two different task functions.
574 - Fix race condition at task function worker usage executing task computation leading to negative value.
578 - 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).
579 - Use back pressure detection in worker choice strategies.
580 - Add worker choice strategies retries mechanism if no worker is eligible.
582 ## [2.6.28] - 2023-08-16
586 - Ensure pool workers are properly initialized.
590 - HTTP server pool examples: express-cluster, express-hybrid.
594 - Remove now useless branching in worker hot code path.
596 ## [2.6.27] - 2023-08-15
600 - Add `KillHandler` type definition to exported types.
604 - Add `destroy` event to pool API.
606 ## [2.6.26] - 2023-08-15
610 - Add kill handler to worker options allowing to execute custom code when worker is killed.
611 - Add `listTaskFunctions()` method to pool API.
612 - SMTP client pool example: nodemailer.
614 ## [2.6.25] - 2023-08-13
618 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
619 - WebSocket server pool examples: ws-cluster, ws-hybrid.
621 ## [2.6.24] - 2023-08-12
625 - Add array of transferable objects to the `execute()` method arguments.
626 - WebSocket server pool examples: ws-worker_threads.
628 ## [2.6.23] - 2023-08-11
632 - 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.
636 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
637 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
639 ## [2.6.22] - 2023-08-10
643 - Add missing `types` field to package.json `exports`.
647 - Structure markdown documentation (PR #811).
649 ## [2.6.21] - 2023-08-03
653 - Improve code documentation.
654 - Code refactoring and cleanup for better maintainability and readability.
656 ## [2.6.20] - 2023-07-21
660 - Fix queued tasks redistribution on error task execution starvation.
661 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
665 - Drastically reduce lookups by worker in the worker nodes.
667 ## [2.6.19] - 2023-07-20
671 - Dedicated internal communication channel for worker_threads pools.
673 ## [2.6.18] - 2023-07-19
677 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
679 ## [2.6.17] - 2023-07-16
683 - Add `listTaskFunctions()` method to worker API.
685 ## [2.6.16] - 2023-07-12
689 - Fix pool startup detection.
690 - Fix worker task functions handling.
692 ## [2.6.15] - 2023-07-11
696 - Take into account worker node readiness in worker choice strategies.
698 ## [2.6.14] - 2023-07-10
702 - Fix task function statistics tracking.
704 ## [2.6.13] - 2023-07-10
708 - Add per task function statistics tracking.
709 - Add public methods to manipulate the worker task functions at runtime.
711 ## [2.6.12] - 2023-07-09
715 - Workaround import issue with `node:os` module in node 16.x.x.
717 ## [2.6.11] - 2023-07-09
721 - Fix pool readiness semantic.
723 ## [2.6.10] - 2023-07-08
727 - Ensure workers are not recreated on error at pool startup.
731 - Add `ready` and `strategy` fields to pool information.
732 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
733 - Add dynamic pool sizing checks.
735 ## [2.6.9] - 2023-07-07
739 - Recreate the right worker type on uncaught exception.
743 - Add minimum and maximum to internal measurement statistics.
744 - Add `runTime` and `waitTime` to pool information.
745 - Check worker inactive time only on dynamic worker.
747 ## [2.6.8] - 2023-07-03
751 - Brown paper bag release to fix version handling in pool information.
753 ## [2.6.7] - 2023-07-03
757 - Ensure worker queued tasks at error are reassigned to other pool workers.
761 - Add pool `utilization` ratio to pool information.
762 - Add `version` to pool information.
763 - Add worker information to worker nodes.
765 ## [2.6.6] - 2023-07-01
769 - Add safe helper `availableParallelism()` to help sizing the pool.
773 - Ensure message handler is only registered in worker.
775 ## [2.6.5] - 2023-06-27
779 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
783 - Artificial version bump to 2.6.5 to workaround publication issue.
784 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
785 - Ensure pool event is emitted before task error promise rejection.
786 - Fix queued tasks count computation.
790 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
792 ## [2.6.4] - 2023-06-27
796 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
800 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
801 - Ensure pool event is emitted before task error promise rejection.
802 - Fix queued tasks count computation.
806 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
808 ## [2.6.3] - 2023-06-19
812 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
813 - Update strategies internals after statistics computation.
817 - Optimize O(1) queue implementation.
819 ## [2.6.2] - 2023-06-12
823 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
825 ## [2.6.1] - 2023-06-10
829 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
833 - Fix average statistics computation: ensure failed tasks are not accounted.
835 ## [2.6.0] - 2023-06-09
839 - Add `LEAST_ELU` worker choice strategy (experimental).
840 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
844 - Refactor pool worker node usage internals.
845 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
846 - Breaking change: pool information `info` property object fields have been renamed.
850 - Fix wait time accounting.
851 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
852 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
854 ## [2.5.4] - 2023-06-07
858 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
862 - Compute statistics at the worker level only if needed.
863 - Add `worker_threads` options to thread pool options.
867 - Make the `LEAST_BUSY` strategy only relies on task runtime.
869 ## [2.5.3] - 2023-06-04
873 - Refine pool information content.
874 - Limit pool internals public exposure.
876 ## [2.5.2] - 2023-06-02
880 - Add `taskError` pool event for task execution error.
881 - Add pool information `info` property to pool.
882 - Emit pool information on `busy` and `full` pool events.
884 ## [2.5.1] - 2023-06-01
888 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
889 - Add `error` pool event for uncaught worker error.
891 ## [2.5.0] - 2023-05-31
895 - Switch pool event emitter to `EventEmitterAsyncResource`.
896 - Add tasks wait time accounting in per worker tasks usage.
897 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
901 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
903 ## [2.4.14] - 2023-05-09
907 - Ensure no undefined task runtime can land in the tasks history.
908 - Fix median computation implementation once again.
912 - Unit tests for median and queue implementations.
914 ## [2.4.13] - 2023-05-08
918 - Fix worker choice strategy options validation.
919 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
921 ## [2.4.12] - 2023-05-06
925 - Support multiple task functions per worker.
926 - Add custom worker weights support to worker choice strategies options.
930 - Use O(1) queue implementation for tasks queueing.
934 - Fix median computation implementation.
935 - Fix fair share worker choice strategy internals update.
937 ## [2.4.11] - 2023-04-23
941 - Optimize free worker finding in worker choice strategies.
943 ## [2.4.10] - 2023-04-15
947 - Fix typescript type definition for task function: ensure the input data is optional.
948 - Fix typescript type definition for pool execute(): ensure the input data is optional.
950 ## [2.4.9] - 2023-04-15
954 - Add tasks queue enablement runtime setter to pool.
955 - Add tasks queue options runtime setter to pool.
956 - Add worker choice strategy options runtime setter to pool.
960 - Remove the tasks queuing experimental status.
964 - Fix task function type definition and validation.
965 - Fix worker choice strategy options handling.
967 ## [2.4.8] - 2023-04-12
971 - Fix message between main worker and worker type definition for tasks.
972 - Fix code documentation.
974 ## [2.4.7] - 2023-04-11
978 - Add worker tasks queue options to pool options.
982 - Fix missing documentation.
984 ## [2.4.6] - 2023-04-10
988 - Ensure one task at a time is executed per worker with tasks queueing enabled.
989 - Properly count worker executing tasks with tasks queueing enabled.
991 ## [2.4.5] - 2023-04-09
995 - Use monotonic high resolution timer for worker tasks runtime.
996 - Add worker tasks median runtime to statistics.
997 - Add worker tasks queue (experimental).
999 ## [2.4.4] - 2023-04-07
1003 - Add `PoolEvents` enumeration and `PoolEvent` type.
1007 - Destroy worker only on alive check.
1009 ## [2.4.3] - 2023-04-07
1013 - Fix typedoc generation with inheritance.
1015 ## [2.4.2] - 2023-04-06
1019 - Add `full` event to dynamic pool.
1020 - Keep worker choice strategy in memory for conditional reuse.
1024 - Fix possible negative worker key at worker removal in worker choice strategies.
1026 ## [2.4.1] - 2023-04-05
1030 - Optimize worker choice strategy for dynamic pool.
1034 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1036 ## [2.4.0] - 2023-04-04
1040 - Add `LESS_BUSY` worker choice strategy.
1044 - Optimize worker storage in pool.
1045 - Optimize worker alive status check.
1046 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1047 - Optimize `LESS_USED` worker choice strategy.
1048 - Update benchmark versus external threads pools.
1049 - Optimize tasks usage statistics requirements for worker choice strategy.
1053 - Ensure trimmable characters are checked at pool initialization.
1054 - Fix message id integer overflow.
1055 - Fix pool worker removal in worker choice strategy internals.
1056 - Fix package publication with pnpm.
1058 ## [2.4.0-3] - 2023-04-04
1062 - Add `LESS_BUSY` worker choice strategy.
1066 - Optimize worker storage in pool.
1067 - Optimize worker alive status check.
1068 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1069 - Optimize `LESS_USED` worker choice strategy.
1070 - Update benchmark versus external threads pools.
1074 - Ensure trimmable characters are checked at pool initialization.
1075 - Fix message id integer overflow.
1076 - Fix pool worker removal in worker choice strategy internals.
1077 - Fix package publication with pnpm.
1079 ## [2.4.0-2] - 2023-04-03
1083 - Add `LESS_BUSY` worker choice strategy.
1087 - Optimize worker storage in pool.
1088 - Optimize worker alive status check.
1089 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1090 - Optimize `LESS_USED` worker choice strategy.
1094 - Ensure trimmable characters are checked at pool initialization.
1095 - Fix message id integer overflow.
1096 - Fix pool worker removal in worker choice strategy internals.
1097 - Fix package publication with pnpm.
1099 ## [2.4.0-1] - 2023-04-03
1103 - Add `LESS_BUSY` worker choice strategy.
1107 - Optimize worker storage in pool.
1108 - Optimize worker alive status check.
1109 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1110 - Optimize `LESS_USED` worker choice strategy.
1114 - Ensure trimmable characters are checked at pool initialization.
1115 - Fix message id integer overflow.
1116 - Fix pool worker removal in worker choice strategy internals.
1118 ## [2.4.0-0] - 2023-04-03
1122 - Add `LESS_BUSY` worker choice strategy.
1126 - Optimize worker storage in pool.
1127 - Optimize worker alive status check.
1128 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1129 - Optimize `LESS_USED` worker choice strategy.
1133 - Ensure trimmable characters are checked at pool initialization.
1134 - Fix message id integer overflow.
1135 - Fix pool worker removal in worker choice strategy internals.
1137 ## [2.3.10] - 2023-03-18
1141 - Fix package.json `exports` syntax for ESM and CommonJS.
1145 - Permit SemVer pre-release publication.
1147 ## [2.3.10-2] - 2023-03-18
1151 - Fix package.json `exports` syntax for ESM and CommonJS.
1153 ## [2.3.10-1] - 2023-03-18
1157 - Permit SemVer pre-release publication.
1159 ## [2.3.10-0] - 2023-03-18
1163 - Fix package.json `exports` syntax for ESM and CommonJS.
1165 ## [2.3.9] - 2023-03-18
1169 - Introduce ESM module support along with CommonJS one.
1173 - Fix brown paper bag bug referencing the same object literal.
1175 ## [2.3.8] - 2023-03-18
1179 - Switch internal benchmarking code to benny.
1180 - Switch to TypeScript 5.x.x.
1181 - Switch rollup bundler plugins to core ones.
1182 - Switch to TSDoc syntax.
1183 - Enforce conventional commits.
1187 - Fix random integer generator.
1188 - Fix worker choice strategy pool type identification at initialization.
1190 ## [2.3.7] - 2022-10-23
1194 - Switch to open collective FOSS project funding platform.
1195 - Switch to ts-standard linter configuration on TypeScript code.
1199 - Fixed missing async on pool execute method.
1200 - Fixed typing in TypeScript example.
1201 - Fixed types in unit tests.
1203 ## [2.3.6] - 2022-10-22
1207 - Cleanup pool attributes and methods.
1208 - Refine error types thrown.
1212 - Fix continuous integration build on windows.
1213 - Fix code coverage reporting by using c8 instead of nyc.
1215 ## [2.3.5] - 2022-10-21
1219 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1220 - Optimize tasks usage lookup implementation.
1224 - Fix missed pool event emitter type export.
1225 - Fix typedoc documentation generation.
1227 ## [2.3.4] - 2022-10-17
1231 - Fully automate release process with release-it.
1235 - Optimize fair share task scheduling algorithm implementation.
1236 - Update benchmark versus external pools results with latest version.
1238 ## [2.3.3] - 2022-10-15
1242 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1244 ## [2.3.2] - 2022-10-14
1248 - Optimize fair share worker selection strategy implementation.
1252 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1254 ## [2.3.1] - 2022-10-13
1258 - Pool worker choice strategies:
1259 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1260 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1262 ## [2.2.2] - 2022-10-09
1266 - Fixed `README.md` file.
1268 ## [2.2.1] - 2022-10-08
1272 - Dynamic worker choice strategy change at runtime.
1274 ## [2.2.0] - 2022-01-05
1276 ### Breaking Changes
1278 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1280 ## [2.1.0] - 2021-08-29
1284 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1286 ### Breaking Changes
1288 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1289 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1290 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1291 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1293 ## [2.0.2] - 2021-05-12
1297 - Fix `busy` event emission on fixed pool type
1299 ## [2.0.1] - 2021-03-16
1303 - Check if pool options are properly set.
1304 - `busy` event is emitted on all pool types.
1306 ## [2.0.0] - 2021-03-01
1310 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1312 ### Breaking Changes
1314 - `FullPool` event is now renamed to `busy`.
1315 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1316 _Find more details on our JSDoc._
1318 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1320 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1322 ### Pool options types declaration merge
1324 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1326 #### New `export` strategy
1330 const DynamicThreadPool = require('poolifier/lib/dynamic')
1332 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1335 But you should always prefer just using
1338 const { DynamicThreadPool } = require('poolifier')
1341 #### New type definitions for input data and response
1343 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1344 _This is not a limitation by poolifier but Node.js._
1346 #### Public property replacements
1348 `numWorkers` property is now `numberOfWorkers`
1350 #### Internal (protected) properties and methods renaming
1352 These properties are not intended for end users
1354 - `id` => `nextMessageId`
1356 These methods are not intended for end users
1358 - `_chooseWorker` => `chooseWorker`
1359 - `_newWorker` => `createWorker`
1360 - `_execute` => `internalExecute`
1361 - `_chooseWorker` => `chooseWorker`
1362 - `_checkAlive` => `checkAlive`
1364 - `_runAsync` => `runAsync`
1366 ## [1.1.0] - 2020-05-21
1370 - ThreadWorker support async functions as option
1371 - Various external library patches
1373 ## [1.0.0] - 2020-01-24
1377 - FixedThreadPool implementation
1378 - DynamicThreadPool implementation
1379 - WorkerThread implementation to improve developer experience