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 - Avoid queued tasks redistribution on the errored worker node.
14 ## [4.0.4] - 2024-05-08
18 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
20 ## [4.0.3] - 2024-05-08
24 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
26 ## [4.0.2] - 2024-05-06
30 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
32 ## [4.0.1] - 2024-05-02
36 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
37 - 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.
39 ## [4.0.0] - 2024-04-30
43 - 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 }`.
44 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
45 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
46 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
50 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
52 ## [3.1.30] - 2024-04-22
56 - Fix `transferList` argument type definition.
58 ## [3.1.29] - 2024-04-02
62 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
64 ## [3.1.28] - 2024-04-01
68 - Ensure the minimum number of workers on a started pool is guaranteed.
70 ## [3.1.27] - 2024-03-27
74 - Fix publishing on JSR, take 4.
76 ## [3.1.26] - 2024-03-27
80 - Fix publishing on JSR, take 3.
82 ## [3.1.25] - 2024-03-27
86 - Fix publishing on JSR, take 2.
88 ## [3.1.24] - 2024-03-27
92 - Fix publishing on JSR.
94 ## [3.1.23] - 2024-03-27
100 ## [3.1.22] - 2024-03-15
104 - Fix pool event emitter registered callbacks removal at `destroy()`.
106 ## [3.1.21] - 2024-02-22
110 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
112 ## [3.1.20] - 2024-02-11
116 - Ensure `worker_threads` workers are unreferenced at termination.
118 ## [3.1.19] - 2024-01-16
122 - Fix possible null exception at task finishing handling.
126 - Optimize Deque implementation to improve tasks queueing performance.
128 ## [3.1.18] - 2024-01-06
132 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
134 ## [3.1.17] - 2024-01-05
138 - Improve performance by clean up unneeded condition checks on hot code paths.
140 ## [3.1.16] - 2024-01-03
144 - Add missing type to TS type definitions.
146 ## [3.1.15] - 2024-01-02
150 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
152 ## [3.1.15-0] - 2024-01-02
156 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
158 ## [3.1.14] - 2024-01-01
162 - Properly handle dynamic pool with zero minimum size.
164 ## [3.1.13] - 2023-12-30
168 - Reduce branching in several hot code paths.
169 - Use faster object cloning implementation.
171 ## [3.1.12] - 2023-12-27
175 - Fix tasks redistribution triggers at pool destroying.
179 - Switch TypeScript module resolution to Node16.
181 ## [3.1.12-0] - 2023-12-27
185 - Fix tasks redistribution triggers at pool destroying.
187 ## [3.1.11] - 2023-12-24
191 - Avoid worker node cross tasks stealing.
192 - Ensure only half the pool worker nodes can steal tasks.
194 ## [3.1.10] - 2023-12-23
198 - Avoid useless branching on pool type.
200 ## [3.1.9] - 2023-12-22
204 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
206 ## [3.1.8] - 2023-12-21
210 - Fix default worker weight computation.
211 - Fix possible null exception at pool destroying.
213 ## [3.1.7] - 2023-12-20
217 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
219 ## [3.1.6] - 2023-12-18
223 - Fix pool destroying with tasks queuing enabled.
225 ## [3.1.5] - 2023-12-18
229 - Add queued tasks end timeout support to worker node termination.
231 ## [3.1.4] - 2023-12-18
235 - Make more robust the fix for possible null exception at handling task execution response.
237 ## [3.1.3] - 2023-12-17
241 - Fix possible null exception at handling task execution response.
243 ## [3.1.2] - 2023-12-17
247 - Wait for queued tasks to end at worker node termination.
249 ## [3.1.1] - 2023-12-16
253 - Fix pool options TS type definition.
255 ## [3.1.0] - 2023-12-16
259 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
261 ## [3.0.14] - 2023-12-13
265 - Fix possible null exception with worker_threads pools.
267 ## [3.0.13] - 2023-12-12
271 - Ensure worker choice strategy wait for worker nodes readiness.
275 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
277 ## [3.0.12] - 2023-12-12
281 - Add infinite retries support in worker choice strategy.
283 ## [3.0.11] - 2023-12-11
287 - Ensure pool asynchronous resource properly track tasks execution.
289 ## [3.0.10] - 2023-12-08
293 - Add a fastpath when tasks stealing or redistribution is impossible.
295 ## [3.0.9] - 2023-11-26
299 - Remove all pool events listener at pool destroying.
300 - Remove all worker node events listener at worker node destroying.
301 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
303 ## [3.0.8] - 2023-11-25
307 - Ensure continuous tasks stealing on idle start at worker node idling.
309 ## [3.0.7] - 2023-11-24
313 - Make continuous tasks stealing start at worker node idling.
315 ## [3.0.6] - 2023-11-24
319 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
320 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
322 ## [3.0.5] - 2023-10-27
326 - Ensure pool `ready` event can be emitted only once.
328 ## [3.0.4] - 2023-10-20
332 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
333 - Use builtin retry mechanism in worker choice strategies instead of custom one.
335 ## [3.0.3] - 2023-10-19
339 - Avoid null exception at sending message to worker.
340 - Avoid null exception at checking worker node readiness.
342 ## [3.0.2] - 2023-10-17
346 - 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).
348 ## [3.0.1] - 2023-10-16
352 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
356 - Switch the worker node eventing code to `EventTarget` API.
358 ## [3.0.0] - 2023-10-08
362 - Remove Node.js 16.x.x (EOL) support.
364 ## [2.7.5] - 2023-10-03
368 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
370 ## [2.7.4] - 2023-09-25
374 - Fix source maps (bundler issue).
376 ## [2.7.3] - 2023-09-24
380 - Convert pool event emitter to event emitter async resource.
382 ## [2.7.2] - 2023-09-23
386 - Add source maps to npm package to ease debugging.
390 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
392 ## [2.7.1] - 2023-09-20
396 - Ensure worker message listener used one time are removed after usage.
398 ## [2.7.0] - 2023-09-19
402 - Fix task stealing related tasks queue options handling at runtime.
406 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
410 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
411 - Stricter worker constructor arguments validation.
413 ## [2.6.45] - 2023-09-17
417 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
421 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
422 - Add `start()` method to pool API to start the minimum number of workers.
423 - 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.
424 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
426 ## [2.6.44] - 2023-09-08
430 - Use a dedicated PAT to publish on GitHub packages registry.
434 - Publish on GitHub packages registry on release.
438 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
440 ## [2.6.43] - 2023-09-08
444 - Publish on GitHub packages registry on release.
448 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
450 ## [2.6.42] - 2023-09-06
454 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
456 ## [2.6.41] - 2023-09-03
460 - Optimize worker choice strategies implementation.
462 ## [2.6.40] - 2023-09-01
466 - Do not pre-choose in WRR worker choice strategy to avoid bias.
467 - Avoid array out of bound in worker choice strategies after worker node removal.
469 ## [2.6.39] - 2023-08-30
473 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
475 ## [2.6.38] - 2023-08-30
479 - Bundle typescript types declaration into one file.
483 - Improve interleaved weighted round robin worker choice strategy implementation.
485 ## [2.6.37] - 2023-08-28
489 - Ensure unused worker usage statistics are deleted at runtime.
493 - Rename worker choice strategy options `choiceRetries` to `retries`.
494 - Avoid unnecessary branching in worker choice strategies.
496 ## [2.6.36] - 2023-08-27
500 - Fix pool `execute()` arguments check.
504 - Make continuous tasks stealing algorithm less aggressive.
505 - Fine tune tasks stealing algorithm under back pressure.
507 ## [2.6.35] - 2023-08-25
511 - Don't account worker usage statistics for tasks that have failed.
512 - Fix pool information runtime and wait time median computation.
516 - Update simple moving average implementation to use a circular buffer.
517 - Update simple moving median implementation to use a circular buffer.
518 - Account for stolen tasks in worker usage statistics and pool information.
522 - Continuous tasks stealing algorithm.
524 ## [2.6.34] - 2023-08-24
528 - Avoid cascading tasks stealing under back pressure.
532 - Add fastpath to queued tasks rescheduling.
534 ## [2.6.33] - 2023-08-24
538 - Fix queued tasks rescheduling.
542 - Rename tasks queue options `queueMaxSize` to `size`.
546 - Task stealing scheduling algorithm if tasks queueing is enabled.
548 ## [2.6.32] - 2023-08-23
552 - Ensure no task can be executed when the pool is destroyed.
556 - Add `queueMaxSize` option to tasks queue options.
557 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
558 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
560 ## [2.6.31] - 2023-08-20
564 - Fix worker choice strategy retries mechanism in some edge cases.
568 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
569 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
571 ## [2.6.30] - 2023-08-19
575 - Ensure pool event `backPressure` is emitted.
576 - Ensure pool event `full` is emitted only once.
577 - Ensure worker node cannot be instantiated without proper arguments.
579 ## [2.6.29] - 2023-08-18
583 - Fix race condition between readiness and task functions worker message handling at startup.
584 - Fix duplicate task function worker usage statistics computation per task function.
585 - Update task function worker usage statistics if and only if there's at least two different task functions.
586 - Fix race condition at task function worker usage executing task computation leading to negative value.
590 - 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).
591 - Use back pressure detection in worker choice strategies.
592 - Add worker choice strategies retries mechanism if no worker is eligible.
594 ## [2.6.28] - 2023-08-16
598 - Ensure pool workers are properly initialized.
602 - HTTP server pool examples: express-cluster, express-hybrid.
606 - Remove now useless branching in worker hot code path.
608 ## [2.6.27] - 2023-08-15
612 - Add `KillHandler` type definition to exported types.
616 - Add `destroy` event to pool API.
618 ## [2.6.26] - 2023-08-15
622 - Add kill handler to worker options allowing to execute custom code when worker is killed.
623 - Add `listTaskFunctions()` method to pool API.
624 - SMTP client pool example: nodemailer.
626 ## [2.6.25] - 2023-08-13
630 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
631 - WebSocket server pool examples: ws-cluster, ws-hybrid.
633 ## [2.6.24] - 2023-08-12
637 - Add array of transferable objects to the `execute()` method arguments.
638 - WebSocket server pool examples: ws-worker_threads.
640 ## [2.6.23] - 2023-08-11
644 - 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.
648 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
649 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
651 ## [2.6.22] - 2023-08-10
655 - Add missing `types` field to package.json `exports`.
659 - Structure markdown documentation (PR #811).
661 ## [2.6.21] - 2023-08-03
665 - Improve code documentation.
666 - Code refactoring and cleanup for better maintainability and readability.
668 ## [2.6.20] - 2023-07-21
672 - Fix queued tasks redistribution on error task execution starvation.
673 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
677 - Drastically reduce lookups by worker in the worker nodes.
679 ## [2.6.19] - 2023-07-20
683 - Dedicated internal communication channel for worker_threads pools.
685 ## [2.6.18] - 2023-07-19
689 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
691 ## [2.6.17] - 2023-07-16
695 - Add `listTaskFunctions()` method to worker API.
697 ## [2.6.16] - 2023-07-12
701 - Fix pool startup detection.
702 - Fix worker task functions handling.
704 ## [2.6.15] - 2023-07-11
708 - Take into account worker node readiness in worker choice strategies.
710 ## [2.6.14] - 2023-07-10
714 - Fix task function statistics tracking.
716 ## [2.6.13] - 2023-07-10
720 - Add per task function statistics tracking.
721 - Add public methods to manipulate the worker task functions at runtime.
723 ## [2.6.12] - 2023-07-09
727 - Workaround import issue with `node:os` module in node 16.x.x.
729 ## [2.6.11] - 2023-07-09
733 - Fix pool readiness semantic.
735 ## [2.6.10] - 2023-07-08
739 - Ensure workers are not recreated on error at pool startup.
743 - Add `ready` and `strategy` fields to pool information.
744 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
745 - Add dynamic pool sizing checks.
747 ## [2.6.9] - 2023-07-07
751 - Recreate the right worker type on uncaught exception.
755 - Add minimum and maximum to internal measurement statistics.
756 - Add `runTime` and `waitTime` to pool information.
757 - Check worker inactive time only on dynamic worker.
759 ## [2.6.8] - 2023-07-03
763 - Brown paper bag release to fix version handling in pool information.
765 ## [2.6.7] - 2023-07-03
769 - Ensure worker queued tasks at error are reassigned to other pool workers.
773 - Add pool `utilization` ratio to pool information.
774 - Add `version` to pool information.
775 - Add worker information to worker nodes.
777 ## [2.6.6] - 2023-07-01
781 - Add safe helper `availableParallelism()` to help sizing the pool.
785 - Ensure message handler is only registered in worker.
787 ## [2.6.5] - 2023-06-27
791 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
795 - Artificial version bump to 2.6.5 to workaround publication issue.
796 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
797 - Ensure pool event is emitted before task error promise rejection.
798 - Fix queued tasks count computation.
802 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
804 ## [2.6.4] - 2023-06-27
808 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
812 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
813 - Ensure pool event is emitted before task error promise rejection.
814 - Fix queued tasks count computation.
818 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
820 ## [2.6.3] - 2023-06-19
824 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
825 - Update strategies internals after statistics computation.
829 - Optimize O(1) queue implementation.
831 ## [2.6.2] - 2023-06-12
835 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
837 ## [2.6.1] - 2023-06-10
841 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
845 - Fix average statistics computation: ensure failed tasks are not accounted.
847 ## [2.6.0] - 2023-06-09
851 - Add `LEAST_ELU` worker choice strategy (experimental).
852 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
856 - Refactor pool worker node usage internals.
857 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
858 - Breaking change: pool information `info` property object fields have been renamed.
862 - Fix wait time accounting.
863 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
864 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
866 ## [2.5.4] - 2023-06-07
870 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
874 - Compute statistics at the worker level only if needed.
875 - Add `worker_threads` options to thread pool options.
879 - Make the `LEAST_BUSY` strategy only relies on task runtime.
881 ## [2.5.3] - 2023-06-04
885 - Refine pool information content.
886 - Limit pool internals public exposure.
888 ## [2.5.2] - 2023-06-02
892 - Add `taskError` pool event for task execution error.
893 - Add pool information `info` property to pool.
894 - Emit pool information on `busy` and `full` pool events.
896 ## [2.5.1] - 2023-06-01
900 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
901 - Add `error` pool event for uncaught worker error.
903 ## [2.5.0] - 2023-05-31
907 - Switch pool event emitter to `EventEmitterAsyncResource`.
908 - Add tasks wait time accounting in per worker tasks usage.
909 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
913 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
915 ## [2.4.14] - 2023-05-09
919 - Ensure no undefined task runtime can land in the tasks history.
920 - Fix median computation implementation once again.
924 - Unit tests for median and queue implementations.
926 ## [2.4.13] - 2023-05-08
930 - Fix worker choice strategy options validation.
931 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
933 ## [2.4.12] - 2023-05-06
937 - Support multiple task functions per worker.
938 - Add custom worker weights support to worker choice strategies options.
942 - Use O(1) queue implementation for tasks queueing.
946 - Fix median computation implementation.
947 - Fix fair share worker choice strategy internals update.
949 ## [2.4.11] - 2023-04-23
953 - Optimize free worker finding in worker choice strategies.
955 ## [2.4.10] - 2023-04-15
959 - Fix typescript type definition for task function: ensure the input data is optional.
960 - Fix typescript type definition for pool execute(): ensure the input data is optional.
962 ## [2.4.9] - 2023-04-15
966 - Add tasks queue enablement runtime setter to pool.
967 - Add tasks queue options runtime setter to pool.
968 - Add worker choice strategy options runtime setter to pool.
972 - Remove the tasks queuing experimental status.
976 - Fix task function type definition and validation.
977 - Fix worker choice strategy options handling.
979 ## [2.4.8] - 2023-04-12
983 - Fix message between main worker and worker type definition for tasks.
984 - Fix code documentation.
986 ## [2.4.7] - 2023-04-11
990 - Add worker tasks queue options to pool options.
994 - Fix missing documentation.
996 ## [2.4.6] - 2023-04-10
1000 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1001 - Properly count worker executing tasks with tasks queueing enabled.
1003 ## [2.4.5] - 2023-04-09
1007 - Use monotonic high resolution timer for worker tasks runtime.
1008 - Add worker tasks median runtime to statistics.
1009 - Add worker tasks queue (experimental).
1011 ## [2.4.4] - 2023-04-07
1015 - Add `PoolEvents` enumeration and `PoolEvent` type.
1019 - Destroy worker only on alive check.
1021 ## [2.4.3] - 2023-04-07
1025 - Fix typedoc generation with inheritance.
1027 ## [2.4.2] - 2023-04-06
1031 - Add `full` event to dynamic pool.
1032 - Keep worker choice strategy in memory for conditional reuse.
1036 - Fix possible negative worker key at worker removal in worker choice strategies.
1038 ## [2.4.1] - 2023-04-05
1042 - Optimize worker choice strategy for dynamic pool.
1046 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1048 ## [2.4.0] - 2023-04-04
1052 - Add `LESS_BUSY` worker choice strategy.
1056 - Optimize worker storage in pool.
1057 - Optimize worker alive status check.
1058 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1059 - Optimize `LESS_USED` worker choice strategy.
1060 - Update benchmark versus external threads pools.
1061 - Optimize tasks usage statistics requirements for worker choice strategy.
1065 - Ensure trimmable characters are checked at pool initialization.
1066 - Fix message id integer overflow.
1067 - Fix pool worker removal in worker choice strategy internals.
1068 - Fix package publication with pnpm.
1070 ## [2.4.0-3] - 2023-04-04
1074 - Add `LESS_BUSY` worker choice strategy.
1078 - Optimize worker storage in pool.
1079 - Optimize worker alive status check.
1080 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1081 - Optimize `LESS_USED` worker choice strategy.
1082 - Update benchmark versus external threads pools.
1086 - Ensure trimmable characters are checked at pool initialization.
1087 - Fix message id integer overflow.
1088 - Fix pool worker removal in worker choice strategy internals.
1089 - Fix package publication with pnpm.
1091 ## [2.4.0-2] - 2023-04-03
1095 - Add `LESS_BUSY` worker choice strategy.
1099 - Optimize worker storage in pool.
1100 - Optimize worker alive status check.
1101 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1102 - Optimize `LESS_USED` worker choice strategy.
1106 - Ensure trimmable characters are checked at pool initialization.
1107 - Fix message id integer overflow.
1108 - Fix pool worker removal in worker choice strategy internals.
1109 - Fix package publication with pnpm.
1111 ## [2.4.0-1] - 2023-04-03
1115 - Add `LESS_BUSY` worker choice strategy.
1119 - Optimize worker storage in pool.
1120 - Optimize worker alive status check.
1121 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1122 - Optimize `LESS_USED` worker choice strategy.
1126 - Ensure trimmable characters are checked at pool initialization.
1127 - Fix message id integer overflow.
1128 - Fix pool worker removal in worker choice strategy internals.
1130 ## [2.4.0-0] - 2023-04-03
1134 - Add `LESS_BUSY` worker choice strategy.
1138 - Optimize worker storage in pool.
1139 - Optimize worker alive status check.
1140 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1141 - Optimize `LESS_USED` worker choice strategy.
1145 - Ensure trimmable characters are checked at pool initialization.
1146 - Fix message id integer overflow.
1147 - Fix pool worker removal in worker choice strategy internals.
1149 ## [2.3.10] - 2023-03-18
1153 - Fix package.json `exports` syntax for ESM and CommonJS.
1157 - Permit SemVer pre-release publication.
1159 ## [2.3.10-2] - 2023-03-18
1163 - Fix package.json `exports` syntax for ESM and CommonJS.
1165 ## [2.3.10-1] - 2023-03-18
1169 - Permit SemVer pre-release publication.
1171 ## [2.3.10-0] - 2023-03-18
1175 - Fix package.json `exports` syntax for ESM and CommonJS.
1177 ## [2.3.9] - 2023-03-18
1181 - Introduce ESM module support along with CommonJS one.
1185 - Fix brown paper bag bug referencing the same object literal.
1187 ## [2.3.8] - 2023-03-18
1191 - Switch internal benchmarking code to benny.
1192 - Switch to TypeScript 5.x.x.
1193 - Switch rollup bundler plugins to core ones.
1194 - Switch to TSDoc syntax.
1195 - Enforce conventional commits.
1199 - Fix random integer generator.
1200 - Fix worker choice strategy pool type identification at initialization.
1202 ## [2.3.7] - 2022-10-23
1206 - Switch to open collective FOSS project funding platform.
1207 - Switch to ts-standard linter configuration on TypeScript code.
1211 - Fixed missing async on pool execute method.
1212 - Fixed typing in TypeScript example.
1213 - Fixed types in unit tests.
1215 ## [2.3.6] - 2022-10-22
1219 - Cleanup pool attributes and methods.
1220 - Refine error types thrown.
1224 - Fix continuous integration build on windows.
1225 - Fix code coverage reporting by using c8 instead of nyc.
1227 ## [2.3.5] - 2022-10-21
1231 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1232 - Optimize tasks usage lookup implementation.
1236 - Fix missed pool event emitter type export.
1237 - Fix typedoc documentation generation.
1239 ## [2.3.4] - 2022-10-17
1243 - Fully automate release process with release-it.
1247 - Optimize fair share task scheduling algorithm implementation.
1248 - Update benchmark versus external pools results with latest version.
1250 ## [2.3.3] - 2022-10-15
1254 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1256 ## [2.3.2] - 2022-10-14
1260 - Optimize fair share worker selection strategy implementation.
1264 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1266 ## [2.3.1] - 2022-10-13
1270 - Pool worker choice strategies:
1271 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1272 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1274 ## [2.2.2] - 2022-10-09
1278 - Fixed `README.md` file.
1280 ## [2.2.1] - 2022-10-08
1284 - Dynamic worker choice strategy change at runtime.
1286 ## [2.2.0] - 2022-01-05
1288 ### Breaking Changes
1290 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1292 ## [2.1.0] - 2021-08-29
1296 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1298 ### Breaking Changes
1300 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1301 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1302 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1303 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1305 ## [2.0.2] - 2021-05-12
1309 - Fix `busy` event emission on fixed pool type
1311 ## [2.0.1] - 2021-03-16
1315 - Check if pool options are properly set.
1316 - `busy` event is emitted on all pool types.
1318 ## [2.0.0] - 2021-03-01
1322 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1324 ### Breaking Changes
1326 - `FullPool` event is now renamed to `busy`.
1327 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1328 _Find more details on our JSDoc._
1330 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1332 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1334 ### Pool options types declaration merge
1336 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1338 #### New `export` strategy
1342 const DynamicThreadPool = require('poolifier/lib/dynamic')
1344 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1347 But you should always prefer just using
1350 const { DynamicThreadPool } = require('poolifier')
1353 #### New type definitions for input data and response
1355 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1356 _This is not a limitation by poolifier but Node.js._
1358 #### Public property replacements
1360 `numWorkers` property is now `numberOfWorkers`
1362 #### Internal (protected) properties and methods renaming
1364 These properties are not intended for end users
1366 - `id` => `nextMessageId`
1368 These methods are not intended for end users
1370 - `_chooseWorker` => `chooseWorker`
1371 - `_newWorker` => `createWorker`
1372 - `_execute` => `internalExecute`
1373 - `_chooseWorker` => `chooseWorker`
1374 - `_checkAlive` => `checkAlive`
1376 - `_runAsync` => `runAsync`
1378 ## [1.1.0] - 2020-05-21
1382 - ThreadWorker support async functions as option
1383 - Various external library patches
1385 ## [1.0.0] - 2020-01-24
1389 - FixedThreadPool implementation
1390 - DynamicThreadPool implementation
1391 - WorkerThread implementation to improve developer experience