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 ## [3.1.12] - 2023-12-27
14 - Fix tasks redistribution triggers at pool destroying.
18 - Switch TypeScript module resolution to Node16.
20 ## [3.1.12-0] - 2023-12-27
24 - Fix tasks redistribution triggers at pool destroying.
26 ## [3.1.11] - 2023-12-24
30 - Avoid worker node cross tasks stealing.
31 - Ensure only half the pool worker nodes can steal tasks.
33 ## [3.1.10] - 2023-12-23
37 - Avoid useless branching on pool type.
39 ## [3.1.9] - 2023-12-22
43 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
45 ## [3.1.8] - 2023-12-21
49 - Fix default worker weight computation.
50 - Fix possible null exception at pool destroying.
52 ## [3.1.7] - 2023-12-20
56 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
58 ## [3.1.6] - 2023-12-18
62 - Fix pool destroying with tasks queuing enabled.
64 ## [3.1.5] - 2023-12-18
68 - Add queued tasks end timeout support to worker node termination.
70 ## [3.1.4] - 2023-12-18
74 - Make more robust the fix for possible null exception at handling task execution response.
76 ## [3.1.3] - 2023-12-17
80 - Fix possible null exception at handling task execution response.
82 ## [3.1.2] - 2023-12-17
86 - Wait for queued tasks to end at worker node termination.
88 ## [3.1.1] - 2023-12-16
92 - Fix pool options TS type definition.
94 ## [3.1.0] - 2023-12-16
98 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
100 ## [3.0.14] - 2023-12-13
104 - Fix possible null exception with worker_threads pools.
106 ## [3.0.13] - 2023-12-12
110 - Ensure worker choice strategy wait for worker nodes readiness.
114 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
116 ## [3.0.12] - 2023-12-12
120 - Add infinite retries support in worker choice strategy.
122 ## [3.0.11] - 2023-12-11
126 - Ensure pool asynchronous resource properly track tasks execution.
128 ## [3.0.10] - 2023-12-08
132 - Add a fastpath when tasks stealing or redistribution is impossible.
134 ## [3.0.9] - 2023-11-26
138 - Remove all pool events listener at pool destroying.
139 - Remove all worker node events listener at worker node destroying.
140 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
142 ## [3.0.8] - 2023-11-25
146 - Ensure continuous tasks stealing on idle start at worker node idling.
148 ## [3.0.7] - 2023-11-24
152 - Make continuous tasks stealing start at worker node idling.
154 ## [3.0.6] - 2023-11-24
158 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
159 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
161 ## [3.0.5] - 2023-10-27
165 - Ensure pool `ready` event can be emitted only once.
167 ## [3.0.4] - 2023-10-20
171 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
172 - Use builtin retry mechanism in worker choice strategies instead of custom one.
174 ## [3.0.3] - 2023-10-19
178 - Avoid null exception at sending message to worker.
179 - Avoid null exception at checking worker node readiness.
181 ## [3.0.2] - 2023-10-17
185 - 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).
187 ## [3.0.1] - 2023-10-16
191 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
195 - Switch the worker node eventing code to `EventTarget` API.
197 ## [3.0.0] - 2023-10-08
201 - Remove Node.js 16.x.x (EOL) support.
203 ## [2.7.5] - 2023-10-03
207 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
209 ## [2.7.4] - 2023-09-25
213 - Fix source maps (bundler issue).
215 ## [2.7.3] - 2023-09-24
219 - Convert pool event emitter to event emitter async resource.
221 ## [2.7.2] - 2023-09-23
225 - Add source maps to npm package to ease debugging.
229 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
231 ## [2.7.1] - 2023-09-20
235 - Ensure worker message listener used one time are removed after usage.
237 ## [2.7.0] - 2023-09-19
241 - Fix task stealing related tasks queue options handling at runtime.
245 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
249 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
250 - Stricter worker constructor arguments validation.
252 ## [2.6.45] - 2023-09-17
256 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
260 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
261 - Add `start()` method to pool API to start the minimum number of workers.
262 - 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.
263 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
265 ## [2.6.44] - 2023-09-08
269 - Use a dedicated PAT to publish on GitHub packages registry.
273 - Publish on GitHub packages registry on release.
277 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
279 ## [2.6.43] - 2023-09-08
283 - Publish on GitHub packages registry on release.
287 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
289 ## [2.6.42] - 2023-09-06
293 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
295 ## [2.6.41] - 2023-09-03
299 - Optimize worker choice strategies implementation.
301 ## [2.6.40] - 2023-09-01
305 - Do not pre-choose in WRR worker choice strategy to avoid bias.
306 - Avoid array out of bound in worker choice strategies after worker node removal.
308 ## [2.6.39] - 2023-08-30
312 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
314 ## [2.6.38] - 2023-08-30
318 - Bundle typescript types declaration into one file.
322 - Improve interleaved weighted round robin worker choice strategy implementation.
324 ## [2.6.37] - 2023-08-28
328 - Ensure unused worker usage statistics are deleted at runtime.
332 - Rename worker choice strategy options `choiceRetries` to `retries`.
333 - Avoid unnecessary branching in worker choice strategies.
335 ## [2.6.36] - 2023-08-27
339 - Fix pool `execute()` arguments check.
343 - Make continuous tasks stealing algorithm less aggressive.
344 - Fine tune tasks stealing algorithm under back pressure.
346 ## [2.6.35] - 2023-08-25
350 - Don't account worker usage statistics for tasks that have failed.
351 - Fix pool information runtime and wait time median computation.
355 - Update simple moving average implementation to use a circular buffer.
356 - Update simple moving median implementation to use a circular buffer.
357 - Account for stolen tasks in worker usage statistics and pool information.
361 - Continuous tasks stealing algorithm.
363 ## [2.6.34] - 2023-08-24
367 - Avoid cascading tasks stealing under back pressure.
371 - Add fastpath to queued tasks rescheduling.
373 ## [2.6.33] - 2023-08-24
377 - Fix queued tasks rescheduling.
381 - Rename tasks queue options `queueMaxSize` to `size`.
385 - Task stealing scheduling algorithm if tasks queueing is enabled.
387 ## [2.6.32] - 2023-08-23
391 - Ensure no task can be executed when the pool is destroyed.
395 - Add `queueMaxSize` option to tasks queue options.
396 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
397 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
399 ## [2.6.31] - 2023-08-20
403 - Fix worker choice strategy retries mechanism in some edge cases.
407 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
408 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
410 ## [2.6.30] - 2023-08-19
414 - Ensure pool event `backPressure` is emitted.
415 - Ensure pool event `full` is emitted only once.
416 - Ensure worker node cannot be instantiated without proper arguments.
418 ## [2.6.29] - 2023-08-18
422 - Fix race condition between readiness and task functions worker message handling at startup.
423 - Fix duplicate task function worker usage statistics computation per task function.
424 - Update task function worker usage statistics if and only if there's at least two different task functions.
425 - Fix race condition at task function worker usage executing task computation leading to negative value.
429 - 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).
430 - Use back pressure detection in worker choice strategies.
431 - Add worker choice strategies retries mechanism if no worker is eligible.
433 ## [2.6.28] - 2023-08-16
437 - Ensure pool workers are properly initialized.
441 - HTTP server pool examples: express-cluster, express-hybrid.
445 - Remove now useless branching in worker hot code path.
447 ## [2.6.27] - 2023-08-15
451 - Add `KillHandler` type definition to exported types.
455 - Add `destroy` event to pool API.
457 ## [2.6.26] - 2023-08-15
461 - Add kill handler to worker options allowing to execute custom code when worker is killed.
462 - Add `listTaskFunctions()` method to pool API.
463 - SMTP client pool example: nodemailer.
465 ## [2.6.25] - 2023-08-13
469 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
470 - WebSocket server pool examples: ws-cluster, ws-hybrid.
472 ## [2.6.24] - 2023-08-12
476 - Add array of transferable objects to the `execute()` method arguments.
477 - WebSocket server pool examples: ws-worker_threads.
479 ## [2.6.23] - 2023-08-11
483 - 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.
487 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
488 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
490 ## [2.6.22] - 2023-08-10
494 - Add missing `types` field to package.json `exports`.
498 - Structure markdown documentation (PR #811).
500 ## [2.6.21] - 2023-08-03
504 - Improve code documentation.
505 - Code refactoring and cleanup for better maintainability and readability.
507 ## [2.6.20] - 2023-07-21
511 - Fix queued tasks redistribution on error task execution starvation.
512 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
516 - Drastically reduce lookups by worker in the worker nodes.
518 ## [2.6.19] - 2023-07-20
522 - Dedicated internal communication channel for worker_threads pools.
524 ## [2.6.18] - 2023-07-19
528 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
530 ## [2.6.17] - 2023-07-16
534 - Add `listTaskFunctions()` method to worker API.
536 ## [2.6.16] - 2023-07-12
540 - Fix pool startup detection.
541 - Fix worker task functions handling.
543 ## [2.6.15] - 2023-07-11
547 - Take into account worker node readiness in worker choice strategies.
549 ## [2.6.14] - 2023-07-10
553 - Fix task function statistics tracking.
555 ## [2.6.13] - 2023-07-10
559 - Add per task function statistics tracking.
560 - Add public methods to manipulate the worker task functions at runtime.
562 ## [2.6.12] - 2023-07-09
566 - Workaround import issue with `node:os` module in node 16.x.x.
568 ## [2.6.11] - 2023-07-09
572 - Fix pool readiness semantic.
574 ## [2.6.10] - 2023-07-08
578 - Ensure workers are not recreated on error at pool startup.
582 - Add `ready` and `strategy` fields to pool information.
583 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
584 - Add dynamic pool sizing checks.
586 ## [2.6.9] - 2023-07-07
590 - Recreate the right worker type on uncaught exception.
594 - Add minimum and maximum to internal measurement statistics.
595 - Add `runTime` and `waitTime` to pool information.
596 - Check worker inactive time only on dynamic worker.
598 ## [2.6.8] - 2023-07-03
602 - Brown paper bag release to fix version handling in pool information.
604 ## [2.6.7] - 2023-07-03
608 - Ensure worker queued tasks at error are reassigned to other pool workers.
612 - Add pool `utilization` ratio to pool information.
613 - Add `version` to pool information.
614 - Add worker information to worker nodes.
616 ## [2.6.6] - 2023-07-01
620 - Add safe helper `availableParallelism()` to help sizing the pool.
624 - Ensure message handler is only registered in worker.
626 ## [2.6.5] - 2023-06-27
630 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
634 - Artificial version bump to 2.6.5 to workaround publication issue.
635 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
636 - Ensure pool event is emitted before task error promise rejection.
637 - Fix queued tasks count computation.
641 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
643 ## [2.6.4] - 2023-06-27
647 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
651 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
652 - Ensure pool event is emitted before task error promise rejection.
653 - Fix queued tasks count computation.
657 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
659 ## [2.6.3] - 2023-06-19
663 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
664 - Update strategies internals after statistics computation.
668 - Optimize O(1) queue implementation.
670 ## [2.6.2] - 2023-06-12
674 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
676 ## [2.6.1] - 2023-06-10
680 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
684 - Fix average statistics computation: ensure failed tasks are not accounted.
686 ## [2.6.0] - 2023-06-09
690 - Add `LEAST_ELU` worker choice strategy (experimental).
691 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
695 - Refactor pool worker node usage internals.
696 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
697 - Breaking change: pool information `info` property object fields have been renamed.
701 - Fix wait time accounting.
702 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
703 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
705 ## [2.5.4] - 2023-06-07
709 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
713 - Compute statistics at the worker level only if needed.
714 - Add `worker_threads` options to thread pool options.
718 - Make the `LEAST_BUSY` strategy only relies on task runtime.
720 ## [2.5.3] - 2023-06-04
724 - Refine pool information content.
725 - Limit pool internals public exposure.
727 ## [2.5.2] - 2023-06-02
731 - Add `taskError` pool event for task execution error.
732 - Add pool information `info` property to pool.
733 - Emit pool information on `busy` and `full` pool events.
735 ## [2.5.1] - 2023-06-01
739 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
740 - Add `error` pool event for uncaught worker error.
742 ## [2.5.0] - 2023-05-31
746 - Switch pool event emitter to `EventEmitterAsyncResource`.
747 - Add tasks wait time accounting in per worker tasks usage.
748 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
752 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
754 ## [2.4.14] - 2023-05-09
758 - Ensure no undefined task runtime can land in the tasks history.
759 - Fix median computation implementation once again.
763 - Unit tests for median and queue implementations.
765 ## [2.4.13] - 2023-05-08
769 - Fix worker choice strategy options validation.
770 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
772 ## [2.4.12] - 2023-05-06
776 - Support multiple task functions per worker.
777 - Add custom worker weights support to worker choice strategies options.
781 - Use O(1) queue implementation for tasks queueing.
785 - Fix median computation implementation.
786 - Fix fair share worker choice strategy internals update.
788 ## [2.4.11] - 2023-04-23
792 - Optimize free worker finding in worker choice strategies.
794 ## [2.4.10] - 2023-04-15
798 - Fix typescript type definition for task function: ensure the input data is optional.
799 - Fix typescript type definition for pool execute(): ensure the input data is optional.
801 ## [2.4.9] - 2023-04-15
805 - Add tasks queue enablement runtime setter to pool.
806 - Add tasks queue options runtime setter to pool.
807 - Add worker choice strategy options runtime setter to pool.
811 - Remove the tasks queuing experimental status.
815 - Fix task function type definition and validation.
816 - Fix worker choice strategy options handling.
818 ## [2.4.8] - 2023-04-12
822 - Fix message between main worker and worker type definition for tasks.
823 - Fix code documentation.
825 ## [2.4.7] - 2023-04-11
829 - Add worker tasks queue options to pool options.
833 - Fix missing documentation.
835 ## [2.4.6] - 2023-04-10
839 - Ensure one task at a time is executed per worker with tasks queueing enabled.
840 - Properly count worker executing tasks with tasks queueing enabled.
842 ## [2.4.5] - 2023-04-09
846 - Use monotonic high resolution timer for worker tasks runtime.
847 - Add worker tasks median runtime to statistics.
848 - Add worker tasks queue (experimental).
850 ## [2.4.4] - 2023-04-07
854 - Add `PoolEvents` enumeration and `PoolEvent` type.
858 - Destroy worker only on alive check.
860 ## [2.4.3] - 2023-04-07
864 - Fix typedoc generation with inheritance.
866 ## [2.4.2] - 2023-04-06
870 - Add `full` event to dynamic pool.
871 - Keep worker choice strategy in memory for conditional reuse.
875 - Fix possible negative worker key at worker removal in worker choice strategies.
877 ## [2.4.1] - 2023-04-05
881 - Optimize worker choice strategy for dynamic pool.
885 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
887 ## [2.4.0] - 2023-04-04
891 - Add `LESS_BUSY` worker choice strategy.
895 - Optimize worker storage in pool.
896 - Optimize worker alive status check.
897 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
898 - Optimize `LESS_USED` worker choice strategy.
899 - Update benchmark versus external threads pools.
900 - Optimize tasks usage statistics requirements for worker choice strategy.
904 - Ensure trimmable characters are checked at pool initialization.
905 - Fix message id integer overflow.
906 - Fix pool worker removal in worker choice strategy internals.
907 - Fix package publication with pnpm.
909 ## [2.4.0-3] - 2023-04-04
913 - Add `LESS_BUSY` worker choice strategy.
917 - Optimize worker storage in pool.
918 - Optimize worker alive status check.
919 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
920 - Optimize `LESS_USED` worker choice strategy.
921 - Update benchmark versus external threads pools.
925 - Ensure trimmable characters are checked at pool initialization.
926 - Fix message id integer overflow.
927 - Fix pool worker removal in worker choice strategy internals.
928 - Fix package publication with pnpm.
930 ## [2.4.0-2] - 2023-04-03
934 - Add `LESS_BUSY` worker choice strategy.
938 - Optimize worker storage in pool.
939 - Optimize worker alive status check.
940 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
941 - Optimize `LESS_USED` worker choice strategy.
945 - Ensure trimmable characters are checked at pool initialization.
946 - Fix message id integer overflow.
947 - Fix pool worker removal in worker choice strategy internals.
948 - Fix package publication with pnpm.
950 ## [2.4.0-1] - 2023-04-03
954 - Add `LESS_BUSY` worker choice strategy.
958 - Optimize worker storage in pool.
959 - Optimize worker alive status check.
960 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
961 - Optimize `LESS_USED` worker choice strategy.
965 - Ensure trimmable characters are checked at pool initialization.
966 - Fix message id integer overflow.
967 - Fix pool worker removal in worker choice strategy internals.
969 ## [2.4.0-0] - 2023-04-03
973 - Add `LESS_BUSY` worker choice strategy.
977 - Optimize worker storage in pool.
978 - Optimize worker alive status check.
979 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
980 - Optimize `LESS_USED` worker choice strategy.
984 - Ensure trimmable characters are checked at pool initialization.
985 - Fix message id integer overflow.
986 - Fix pool worker removal in worker choice strategy internals.
988 ## [2.3.10] - 2023-03-18
992 - Fix package.json `exports` syntax for ESM and CommonJS.
996 - Permit SemVer pre-release publication.
998 ## [2.3.10-2] - 2023-03-18
1002 - Fix package.json `exports` syntax for ESM and CommonJS.
1004 ## [2.3.10-1] - 2023-03-18
1008 - Permit SemVer pre-release publication.
1010 ## [2.3.10-0] - 2023-03-18
1014 - Fix package.json `exports` syntax for ESM and CommonJS.
1016 ## [2.3.9] - 2023-03-18
1020 - Introduce ESM module support along with CommonJS one.
1024 - Fix brown paper bag bug referencing the same object literal.
1026 ## [2.3.8] - 2023-03-18
1030 - Switch internal benchmarking code to benny.
1031 - Switch to TypeScript 5.x.x.
1032 - Switch rollup bundler plugins to core ones.
1033 - Switch to TSDoc syntax.
1034 - Enforce conventional commits.
1038 - Fix random integer generator.
1039 - Fix worker choice strategy pool type identification at initialization.
1041 ## [2.3.7] - 2022-10-23
1045 - Switch to open collective FOSS project funding platform.
1046 - Switch to ts-standard linter configuration on TypeScript code.
1050 - Fixed missing async on pool execute method.
1051 - Fixed typing in TypeScript example.
1052 - Fixed types in unit tests.
1054 ## [2.3.6] - 2022-10-22
1058 - Cleanup pool attributes and methods.
1059 - Refine error types thrown.
1063 - Fix continuous integration build on windows.
1064 - Fix code coverage reporting by using c8 instead of nyc.
1066 ## [2.3.5] - 2022-10-21
1070 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1071 - Optimize tasks usage lookup implementation.
1075 - Fix missed pool event emitter type export.
1076 - Fix typedoc documentation generation.
1078 ## [2.3.4] - 2022-10-17
1082 - Fully automate release process with release-it.
1086 - Optimize fair share task scheduling algorithm implementation.
1087 - Update benchmark versus external pools results with latest version.
1089 ## [2.3.3] - 2022-10-15
1093 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1095 ## [2.3.2] - 2022-10-14
1099 - Optimize fair share worker selection strategy implementation.
1103 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1105 ## [2.3.1] - 2022-10-13
1109 - Pool worker choice strategies:
1110 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1111 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1113 ## [2.2.2] - 2022-10-09
1117 - Fixed `README.md` file.
1119 ## [2.2.1] - 2022-10-08
1123 - Dynamic worker choice strategy change at runtime.
1125 ## [2.2.0] - 2022-01-05
1127 ### Breaking Changes
1129 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1131 ## [2.1.0] - 2021-08-29
1135 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1137 ### Breaking Changes
1139 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1140 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1141 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1142 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1144 ## [2.0.2] - 2021-05-12
1148 - Fix `busy` event emission on fixed pool type
1150 ## [2.0.1] - 2021-03-16
1154 - Check if pool options are properly set.
1155 - `busy` event is emitted on all pool types.
1157 ## [2.0.0] - 2021-03-01
1161 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1163 ### Breaking Changes
1165 - `FullPool` event is now renamed to `busy`.
1166 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1167 _Find more details on our JSDoc._
1169 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1171 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1173 ### Pool options types declaration merge
1175 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1177 #### New `export` strategy
1181 const DynamicThreadPool = require('poolifier/lib/dynamic')
1183 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1186 But you should always prefer just using
1189 const { DynamicThreadPool } = require('poolifier')
1192 #### New type definitions for input data and response
1194 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1195 _This is not a limitation by poolifier but Node.js._
1197 #### Public property replacements
1199 `numWorkers` property is now `numberOfWorkers`
1201 #### Internal (protected) properties and methods renaming
1203 These properties are not intended for end users
1205 - `id` => `nextMessageId`
1207 These methods are not intended for end users
1209 - `_chooseWorker` => `chooseWorker`
1210 - `_newWorker` => `createWorker`
1211 - `_execute` => `internalExecute`
1212 - `_chooseWorker` => `chooseWorker`
1213 - `_checkAlive` => `checkAlive`
1215 - `_runAsync` => `runAsync`
1217 ## [1.1.0] - 2020-05-21
1221 - ThreadWorker support async functions as option
1222 - Various external library patches
1224 ## [1.0.0] - 2020-01-24
1228 - FixedThreadPool implementation
1229 - DynamicThreadPool implementation
1230 - WorkerThread implementation to improve developer experience