3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
10 ## [4.0.4] - 2024-05-08
14 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
16 ## [4.0.3] - 2024-05-08
20 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
22 ## [4.0.2] - 2024-05-06
26 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
28 ## [4.0.1] - 2024-05-02
32 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
33 - 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.
35 ## [4.0.0] - 2024-04-30
39 - 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 }`.
40 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
41 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
42 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
46 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
48 ## [3.1.30] - 2024-04-22
52 - Fix `transferList` argument type definition.
54 ## [3.1.29] - 2024-04-02
58 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
60 ## [3.1.28] - 2024-04-01
64 - Ensure the minimum number of workers on a started pool is guaranteed.
66 ## [3.1.27] - 2024-03-27
70 - Fix publishing on JSR, take 4.
72 ## [3.1.26] - 2024-03-27
76 - Fix publishing on JSR, take 3.
78 ## [3.1.25] - 2024-03-27
82 - Fix publishing on JSR, take 2.
84 ## [3.1.24] - 2024-03-27
88 - Fix publishing on JSR.
90 ## [3.1.23] - 2024-03-27
96 ## [3.1.22] - 2024-03-15
100 - Fix pool event emitter registered callbacks removal at `destroy()`.
102 ## [3.1.21] - 2024-02-22
106 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
108 ## [3.1.20] - 2024-02-11
112 - Ensure `worker_threads` workers are unreferenced at termination.
114 ## [3.1.19] - 2024-01-16
118 - Fix possible null exception at task finishing handling.
122 - Optimize Deque implementation to improve tasks queueing performance.
124 ## [3.1.18] - 2024-01-06
128 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
130 ## [3.1.17] - 2024-01-05
134 - Improve performance by clean up unneeded condition checks on hot code paths.
136 ## [3.1.16] - 2024-01-03
140 - Add missing type to TS type definitions.
142 ## [3.1.15] - 2024-01-02
146 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
148 ## [3.1.15-0] - 2024-01-02
152 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
154 ## [3.1.14] - 2024-01-01
158 - Properly handle dynamic pool with zero minimum size.
160 ## [3.1.13] - 2023-12-30
164 - Reduce branching in several hot code paths.
165 - Use faster object cloning implementation.
167 ## [3.1.12] - 2023-12-27
171 - Fix tasks redistribution triggers at pool destroying.
175 - Switch TypeScript module resolution to Node16.
177 ## [3.1.12-0] - 2023-12-27
181 - Fix tasks redistribution triggers at pool destroying.
183 ## [3.1.11] - 2023-12-24
187 - Avoid worker node cross tasks stealing.
188 - Ensure only half the pool worker nodes can steal tasks.
190 ## [3.1.10] - 2023-12-23
194 - Avoid useless branching on pool type.
196 ## [3.1.9] - 2023-12-22
200 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
202 ## [3.1.8] - 2023-12-21
206 - Fix default worker weight computation.
207 - Fix possible null exception at pool destroying.
209 ## [3.1.7] - 2023-12-20
213 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
215 ## [3.1.6] - 2023-12-18
219 - Fix pool destroying with tasks queuing enabled.
221 ## [3.1.5] - 2023-12-18
225 - Add queued tasks end timeout support to worker node termination.
227 ## [3.1.4] - 2023-12-18
231 - Make more robust the fix for possible null exception at handling task execution response.
233 ## [3.1.3] - 2023-12-17
237 - Fix possible null exception at handling task execution response.
239 ## [3.1.2] - 2023-12-17
243 - Wait for queued tasks to end at worker node termination.
245 ## [3.1.1] - 2023-12-16
249 - Fix pool options TS type definition.
251 ## [3.1.0] - 2023-12-16
255 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
257 ## [3.0.14] - 2023-12-13
261 - Fix possible null exception with worker_threads pools.
263 ## [3.0.13] - 2023-12-12
267 - Ensure worker choice strategy wait for worker nodes readiness.
271 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
273 ## [3.0.12] - 2023-12-12
277 - Add infinite retries support in worker choice strategy.
279 ## [3.0.11] - 2023-12-11
283 - Ensure pool asynchronous resource properly track tasks execution.
285 ## [3.0.10] - 2023-12-08
289 - Add a fastpath when tasks stealing or redistribution is impossible.
291 ## [3.0.9] - 2023-11-26
295 - Remove all pool events listener at pool destroying.
296 - Remove all worker node events listener at worker node destroying.
297 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
299 ## [3.0.8] - 2023-11-25
303 - Ensure continuous tasks stealing on idle start at worker node idling.
305 ## [3.0.7] - 2023-11-24
309 - Make continuous tasks stealing start at worker node idling.
311 ## [3.0.6] - 2023-11-24
315 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
316 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
318 ## [3.0.5] - 2023-10-27
322 - Ensure pool `ready` event can be emitted only once.
324 ## [3.0.4] - 2023-10-20
328 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
329 - Use builtin retry mechanism in worker choice strategies instead of custom one.
331 ## [3.0.3] - 2023-10-19
335 - Avoid null exception at sending message to worker.
336 - Avoid null exception at checking worker node readiness.
338 ## [3.0.2] - 2023-10-17
342 - 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).
344 ## [3.0.1] - 2023-10-16
348 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
352 - Switch the worker node eventing code to `EventTarget` API.
354 ## [3.0.0] - 2023-10-08
358 - Remove Node.js 16.x.x (EOL) support.
360 ## [2.7.5] - 2023-10-03
364 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
366 ## [2.7.4] - 2023-09-25
370 - Fix source maps (bundler issue).
372 ## [2.7.3] - 2023-09-24
376 - Convert pool event emitter to event emitter async resource.
378 ## [2.7.2] - 2023-09-23
382 - Add source maps to npm package to ease debugging.
386 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
388 ## [2.7.1] - 2023-09-20
392 - Ensure worker message listener used one time are removed after usage.
394 ## [2.7.0] - 2023-09-19
398 - Fix task stealing related tasks queue options handling at runtime.
402 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
406 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
407 - Stricter worker constructor arguments validation.
409 ## [2.6.45] - 2023-09-17
413 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
417 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
418 - Add `start()` method to pool API to start the minimum number of workers.
419 - 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.
420 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
422 ## [2.6.44] - 2023-09-08
426 - Use a dedicated PAT to publish on GitHub packages registry.
430 - Publish on GitHub packages registry on release.
434 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
436 ## [2.6.43] - 2023-09-08
440 - Publish on GitHub packages registry on release.
444 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
446 ## [2.6.42] - 2023-09-06
450 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
452 ## [2.6.41] - 2023-09-03
456 - Optimize worker choice strategies implementation.
458 ## [2.6.40] - 2023-09-01
462 - Do not pre-choose in WRR worker choice strategy to avoid bias.
463 - Avoid array out of bound in worker choice strategies after worker node removal.
465 ## [2.6.39] - 2023-08-30
469 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
471 ## [2.6.38] - 2023-08-30
475 - Bundle typescript types declaration into one file.
479 - Improve interleaved weighted round robin worker choice strategy implementation.
481 ## [2.6.37] - 2023-08-28
485 - Ensure unused worker usage statistics are deleted at runtime.
489 - Rename worker choice strategy options `choiceRetries` to `retries`.
490 - Avoid unnecessary branching in worker choice strategies.
492 ## [2.6.36] - 2023-08-27
496 - Fix pool `execute()` arguments check.
500 - Make continuous tasks stealing algorithm less aggressive.
501 - Fine tune tasks stealing algorithm under back pressure.
503 ## [2.6.35] - 2023-08-25
507 - Don't account worker usage statistics for tasks that have failed.
508 - Fix pool information runtime and wait time median computation.
512 - Update simple moving average implementation to use a circular buffer.
513 - Update simple moving median implementation to use a circular buffer.
514 - Account for stolen tasks in worker usage statistics and pool information.
518 - Continuous tasks stealing algorithm.
520 ## [2.6.34] - 2023-08-24
524 - Avoid cascading tasks stealing under back pressure.
528 - Add fastpath to queued tasks rescheduling.
530 ## [2.6.33] - 2023-08-24
534 - Fix queued tasks rescheduling.
538 - Rename tasks queue options `queueMaxSize` to `size`.
542 - Task stealing scheduling algorithm if tasks queueing is enabled.
544 ## [2.6.32] - 2023-08-23
548 - Ensure no task can be executed when the pool is destroyed.
552 - Add `queueMaxSize` option to tasks queue options.
553 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
554 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
556 ## [2.6.31] - 2023-08-20
560 - Fix worker choice strategy retries mechanism in some edge cases.
564 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
565 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
567 ## [2.6.30] - 2023-08-19
571 - Ensure pool event `backPressure` is emitted.
572 - Ensure pool event `full` is emitted only once.
573 - Ensure worker node cannot be instantiated without proper arguments.
575 ## [2.6.29] - 2023-08-18
579 - Fix race condition between readiness and task functions worker message handling at startup.
580 - Fix duplicate task function worker usage statistics computation per task function.
581 - Update task function worker usage statistics if and only if there's at least two different task functions.
582 - Fix race condition at task function worker usage executing task computation leading to negative value.
586 - 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).
587 - Use back pressure detection in worker choice strategies.
588 - Add worker choice strategies retries mechanism if no worker is eligible.
590 ## [2.6.28] - 2023-08-16
594 - Ensure pool workers are properly initialized.
598 - HTTP server pool examples: express-cluster, express-hybrid.
602 - Remove now useless branching in worker hot code path.
604 ## [2.6.27] - 2023-08-15
608 - Add `KillHandler` type definition to exported types.
612 - Add `destroy` event to pool API.
614 ## [2.6.26] - 2023-08-15
618 - Add kill handler to worker options allowing to execute custom code when worker is killed.
619 - Add `listTaskFunctions()` method to pool API.
620 - SMTP client pool example: nodemailer.
622 ## [2.6.25] - 2023-08-13
626 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
627 - WebSocket server pool examples: ws-cluster, ws-hybrid.
629 ## [2.6.24] - 2023-08-12
633 - Add array of transferable objects to the `execute()` method arguments.
634 - WebSocket server pool examples: ws-worker_threads.
636 ## [2.6.23] - 2023-08-11
640 - 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.
644 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
645 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
647 ## [2.6.22] - 2023-08-10
651 - Add missing `types` field to package.json `exports`.
655 - Structure markdown documentation (PR #811).
657 ## [2.6.21] - 2023-08-03
661 - Improve code documentation.
662 - Code refactoring and cleanup for better maintainability and readability.
664 ## [2.6.20] - 2023-07-21
668 - Fix queued tasks redistribution on error task execution starvation.
669 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
673 - Drastically reduce lookups by worker in the worker nodes.
675 ## [2.6.19] - 2023-07-20
679 - Dedicated internal communication channel for worker_threads pools.
681 ## [2.6.18] - 2023-07-19
685 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
687 ## [2.6.17] - 2023-07-16
691 - Add `listTaskFunctions()` method to worker API.
693 ## [2.6.16] - 2023-07-12
697 - Fix pool startup detection.
698 - Fix worker task functions handling.
700 ## [2.6.15] - 2023-07-11
704 - Take into account worker node readiness in worker choice strategies.
706 ## [2.6.14] - 2023-07-10
710 - Fix task function statistics tracking.
712 ## [2.6.13] - 2023-07-10
716 - Add per task function statistics tracking.
717 - Add public methods to manipulate the worker task functions at runtime.
719 ## [2.6.12] - 2023-07-09
723 - Workaround import issue with `node:os` module in node 16.x.x.
725 ## [2.6.11] - 2023-07-09
729 - Fix pool readiness semantic.
731 ## [2.6.10] - 2023-07-08
735 - Ensure workers are not recreated on error at pool startup.
739 - Add `ready` and `strategy` fields to pool information.
740 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
741 - Add dynamic pool sizing checks.
743 ## [2.6.9] - 2023-07-07
747 - Recreate the right worker type on uncaught exception.
751 - Add minimum and maximum to internal measurement statistics.
752 - Add `runTime` and `waitTime` to pool information.
753 - Check worker inactive time only on dynamic worker.
755 ## [2.6.8] - 2023-07-03
759 - Brown paper bag release to fix version handling in pool information.
761 ## [2.6.7] - 2023-07-03
765 - Ensure worker queued tasks at error are reassigned to other pool workers.
769 - Add pool `utilization` ratio to pool information.
770 - Add `version` to pool information.
771 - Add worker information to worker nodes.
773 ## [2.6.6] - 2023-07-01
777 - Add safe helper `availableParallelism()` to help sizing the pool.
781 - Ensure message handler is only registered in worker.
783 ## [2.6.5] - 2023-06-27
787 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
791 - Artificial version bump to 2.6.5 to workaround publication issue.
792 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
793 - Ensure pool event is emitted before task error promise rejection.
794 - Fix queued tasks count computation.
798 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
800 ## [2.6.4] - 2023-06-27
804 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
808 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
809 - Ensure pool event is emitted before task error promise rejection.
810 - Fix queued tasks count computation.
814 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
816 ## [2.6.3] - 2023-06-19
820 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
821 - Update strategies internals after statistics computation.
825 - Optimize O(1) queue implementation.
827 ## [2.6.2] - 2023-06-12
831 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
833 ## [2.6.1] - 2023-06-10
837 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
841 - Fix average statistics computation: ensure failed tasks are not accounted.
843 ## [2.6.0] - 2023-06-09
847 - Add `LEAST_ELU` worker choice strategy (experimental).
848 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
852 - Refactor pool worker node usage internals.
853 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
854 - Breaking change: pool information `info` property object fields have been renamed.
858 - Fix wait time accounting.
859 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
860 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
862 ## [2.5.4] - 2023-06-07
866 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
870 - Compute statistics at the worker level only if needed.
871 - Add `worker_threads` options to thread pool options.
875 - Make the `LEAST_BUSY` strategy only relies on task runtime.
877 ## [2.5.3] - 2023-06-04
881 - Refine pool information content.
882 - Limit pool internals public exposure.
884 ## [2.5.2] - 2023-06-02
888 - Add `taskError` pool event for task execution error.
889 - Add pool information `info` property to pool.
890 - Emit pool information on `busy` and `full` pool events.
892 ## [2.5.1] - 2023-06-01
896 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
897 - Add `error` pool event for uncaught worker error.
899 ## [2.5.0] - 2023-05-31
903 - Switch pool event emitter to `EventEmitterAsyncResource`.
904 - Add tasks wait time accounting in per worker tasks usage.
905 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
909 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
911 ## [2.4.14] - 2023-05-09
915 - Ensure no undefined task runtime can land in the tasks history.
916 - Fix median computation implementation once again.
920 - Unit tests for median and queue implementations.
922 ## [2.4.13] - 2023-05-08
926 - Fix worker choice strategy options validation.
927 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
929 ## [2.4.12] - 2023-05-06
933 - Support multiple task functions per worker.
934 - Add custom worker weights support to worker choice strategies options.
938 - Use O(1) queue implementation for tasks queueing.
942 - Fix median computation implementation.
943 - Fix fair share worker choice strategy internals update.
945 ## [2.4.11] - 2023-04-23
949 - Optimize free worker finding in worker choice strategies.
951 ## [2.4.10] - 2023-04-15
955 - Fix typescript type definition for task function: ensure the input data is optional.
956 - Fix typescript type definition for pool execute(): ensure the input data is optional.
958 ## [2.4.9] - 2023-04-15
962 - Add tasks queue enablement runtime setter to pool.
963 - Add tasks queue options runtime setter to pool.
964 - Add worker choice strategy options runtime setter to pool.
968 - Remove the tasks queuing experimental status.
972 - Fix task function type definition and validation.
973 - Fix worker choice strategy options handling.
975 ## [2.4.8] - 2023-04-12
979 - Fix message between main worker and worker type definition for tasks.
980 - Fix code documentation.
982 ## [2.4.7] - 2023-04-11
986 - Add worker tasks queue options to pool options.
990 - Fix missing documentation.
992 ## [2.4.6] - 2023-04-10
996 - Ensure one task at a time is executed per worker with tasks queueing enabled.
997 - Properly count worker executing tasks with tasks queueing enabled.
999 ## [2.4.5] - 2023-04-09
1003 - Use monotonic high resolution timer for worker tasks runtime.
1004 - Add worker tasks median runtime to statistics.
1005 - Add worker tasks queue (experimental).
1007 ## [2.4.4] - 2023-04-07
1011 - Add `PoolEvents` enumeration and `PoolEvent` type.
1015 - Destroy worker only on alive check.
1017 ## [2.4.3] - 2023-04-07
1021 - Fix typedoc generation with inheritance.
1023 ## [2.4.2] - 2023-04-06
1027 - Add `full` event to dynamic pool.
1028 - Keep worker choice strategy in memory for conditional reuse.
1032 - Fix possible negative worker key at worker removal in worker choice strategies.
1034 ## [2.4.1] - 2023-04-05
1038 - Optimize worker choice strategy for dynamic pool.
1042 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1044 ## [2.4.0] - 2023-04-04
1048 - Add `LESS_BUSY` worker choice strategy.
1052 - Optimize worker storage in pool.
1053 - Optimize worker alive status check.
1054 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1055 - Optimize `LESS_USED` worker choice strategy.
1056 - Update benchmark versus external threads pools.
1057 - Optimize tasks usage statistics requirements for worker choice strategy.
1061 - Ensure trimmable characters are checked at pool initialization.
1062 - Fix message id integer overflow.
1063 - Fix pool worker removal in worker choice strategy internals.
1064 - Fix package publication with pnpm.
1066 ## [2.4.0-3] - 2023-04-04
1070 - Add `LESS_BUSY` worker choice strategy.
1074 - Optimize worker storage in pool.
1075 - Optimize worker alive status check.
1076 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1077 - Optimize `LESS_USED` worker choice strategy.
1078 - Update benchmark versus external threads pools.
1082 - Ensure trimmable characters are checked at pool initialization.
1083 - Fix message id integer overflow.
1084 - Fix pool worker removal in worker choice strategy internals.
1085 - Fix package publication with pnpm.
1087 ## [2.4.0-2] - 2023-04-03
1091 - Add `LESS_BUSY` worker choice strategy.
1095 - Optimize worker storage in pool.
1096 - Optimize worker alive status check.
1097 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1098 - Optimize `LESS_USED` worker choice strategy.
1102 - Ensure trimmable characters are checked at pool initialization.
1103 - Fix message id integer overflow.
1104 - Fix pool worker removal in worker choice strategy internals.
1105 - Fix package publication with pnpm.
1107 ## [2.4.0-1] - 2023-04-03
1111 - Add `LESS_BUSY` worker choice strategy.
1115 - Optimize worker storage in pool.
1116 - Optimize worker alive status check.
1117 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1118 - Optimize `LESS_USED` worker choice strategy.
1122 - Ensure trimmable characters are checked at pool initialization.
1123 - Fix message id integer overflow.
1124 - Fix pool worker removal in worker choice strategy internals.
1126 ## [2.4.0-0] - 2023-04-03
1130 - Add `LESS_BUSY` worker choice strategy.
1134 - Optimize worker storage in pool.
1135 - Optimize worker alive status check.
1136 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1137 - Optimize `LESS_USED` worker choice strategy.
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.
1145 ## [2.3.10] - 2023-03-18
1149 - Fix package.json `exports` syntax for ESM and CommonJS.
1153 - Permit SemVer pre-release publication.
1155 ## [2.3.10-2] - 2023-03-18
1159 - Fix package.json `exports` syntax for ESM and CommonJS.
1161 ## [2.3.10-1] - 2023-03-18
1165 - Permit SemVer pre-release publication.
1167 ## [2.3.10-0] - 2023-03-18
1171 - Fix package.json `exports` syntax for ESM and CommonJS.
1173 ## [2.3.9] - 2023-03-18
1177 - Introduce ESM module support along with CommonJS one.
1181 - Fix brown paper bag bug referencing the same object literal.
1183 ## [2.3.8] - 2023-03-18
1187 - Switch internal benchmarking code to benny.
1188 - Switch to TypeScript 5.x.x.
1189 - Switch rollup bundler plugins to core ones.
1190 - Switch to TSDoc syntax.
1191 - Enforce conventional commits.
1195 - Fix random integer generator.
1196 - Fix worker choice strategy pool type identification at initialization.
1198 ## [2.3.7] - 2022-10-23
1202 - Switch to open collective FOSS project funding platform.
1203 - Switch to ts-standard linter configuration on TypeScript code.
1207 - Fixed missing async on pool execute method.
1208 - Fixed typing in TypeScript example.
1209 - Fixed types in unit tests.
1211 ## [2.3.6] - 2022-10-22
1215 - Cleanup pool attributes and methods.
1216 - Refine error types thrown.
1220 - Fix continuous integration build on windows.
1221 - Fix code coverage reporting by using c8 instead of nyc.
1223 ## [2.3.5] - 2022-10-21
1227 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1228 - Optimize tasks usage lookup implementation.
1232 - Fix missed pool event emitter type export.
1233 - Fix typedoc documentation generation.
1235 ## [2.3.4] - 2022-10-17
1239 - Fully automate release process with release-it.
1243 - Optimize fair share task scheduling algorithm implementation.
1244 - Update benchmark versus external pools results with latest version.
1246 ## [2.3.3] - 2022-10-15
1250 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1252 ## [2.3.2] - 2022-10-14
1256 - Optimize fair share worker selection strategy implementation.
1260 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1262 ## [2.3.1] - 2022-10-13
1266 - Pool worker choice strategies:
1267 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1268 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1270 ## [2.2.2] - 2022-10-09
1274 - Fixed `README.md` file.
1276 ## [2.2.1] - 2022-10-08
1280 - Dynamic worker choice strategy change at runtime.
1282 ## [2.2.0] - 2022-01-05
1284 ### Breaking Changes
1286 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1288 ## [2.1.0] - 2021-08-29
1292 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1294 ### Breaking Changes
1296 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1297 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1298 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1299 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1301 ## [2.0.2] - 2021-05-12
1305 - Fix `busy` event emission on fixed pool type
1307 ## [2.0.1] - 2021-03-16
1311 - Check if pool options are properly set.
1312 - `busy` event is emitted on all pool types.
1314 ## [2.0.0] - 2021-03-01
1318 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1320 ### Breaking Changes
1322 - `FullPool` event is now renamed to `busy`.
1323 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1324 _Find more details on our JSDoc._
1326 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1328 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1330 ### Pool options types declaration merge
1332 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1334 #### New `export` strategy
1338 const DynamicThreadPool = require('poolifier/lib/dynamic')
1340 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1343 But you should always prefer just using
1346 const { DynamicThreadPool } = require('poolifier')
1349 #### New type definitions for input data and response
1351 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1352 _This is not a limitation by poolifier but Node.js._
1354 #### Public property replacements
1356 `numWorkers` property is now `numberOfWorkers`
1358 #### Internal (protected) properties and methods renaming
1360 These properties are not intended for end users
1362 - `id` => `nextMessageId`
1364 These methods are not intended for end users
1366 - `_chooseWorker` => `chooseWorker`
1367 - `_newWorker` => `createWorker`
1368 - `_execute` => `internalExecute`
1369 - `_chooseWorker` => `chooseWorker`
1370 - `_checkAlive` => `checkAlive`
1372 - `_runAsync` => `runAsync`
1374 ## [1.1.0] - 2020-05-21
1378 - ThreadWorker support async functions as option
1379 - Various external library patches
1381 ## [1.0.0] - 2020-01-24
1385 - FixedThreadPool implementation
1386 - DynamicThreadPool implementation
1387 - WorkerThread implementation to improve developer experience