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 - Properly handle dynamic pool with zero minimum size.
14 ## [3.1.13] - 2023-12-30
18 - Reduce branching in several hot code paths.
19 - Use faster object cloning implementation.
21 ## [3.1.12] - 2023-12-27
25 - Fix tasks redistribution triggers at pool destroying.
29 - Switch TypeScript module resolution to Node16.
31 ## [3.1.12-0] - 2023-12-27
35 - Fix tasks redistribution triggers at pool destroying.
37 ## [3.1.11] - 2023-12-24
41 - Avoid worker node cross tasks stealing.
42 - Ensure only half the pool worker nodes can steal tasks.
44 ## [3.1.10] - 2023-12-23
48 - Avoid useless branching on pool type.
50 ## [3.1.9] - 2023-12-22
54 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
56 ## [3.1.8] - 2023-12-21
60 - Fix default worker weight computation.
61 - Fix possible null exception at pool destroying.
63 ## [3.1.7] - 2023-12-20
67 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
69 ## [3.1.6] - 2023-12-18
73 - Fix pool destroying with tasks queuing enabled.
75 ## [3.1.5] - 2023-12-18
79 - Add queued tasks end timeout support to worker node termination.
81 ## [3.1.4] - 2023-12-18
85 - Make more robust the fix for possible null exception at handling task execution response.
87 ## [3.1.3] - 2023-12-17
91 - Fix possible null exception at handling task execution response.
93 ## [3.1.2] - 2023-12-17
97 - Wait for queued tasks to end at worker node termination.
99 ## [3.1.1] - 2023-12-16
103 - Fix pool options TS type definition.
105 ## [3.1.0] - 2023-12-16
109 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
111 ## [3.0.14] - 2023-12-13
115 - Fix possible null exception with worker_threads pools.
117 ## [3.0.13] - 2023-12-12
121 - Ensure worker choice strategy wait for worker nodes readiness.
125 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
127 ## [3.0.12] - 2023-12-12
131 - Add infinite retries support in worker choice strategy.
133 ## [3.0.11] - 2023-12-11
137 - Ensure pool asynchronous resource properly track tasks execution.
139 ## [3.0.10] - 2023-12-08
143 - Add a fastpath when tasks stealing or redistribution is impossible.
145 ## [3.0.9] - 2023-11-26
149 - Remove all pool events listener at pool destroying.
150 - Remove all worker node events listener at worker node destroying.
151 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
153 ## [3.0.8] - 2023-11-25
157 - Ensure continuous tasks stealing on idle start at worker node idling.
159 ## [3.0.7] - 2023-11-24
163 - Make continuous tasks stealing start at worker node idling.
165 ## [3.0.6] - 2023-11-24
169 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
170 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
172 ## [3.0.5] - 2023-10-27
176 - Ensure pool `ready` event can be emitted only once.
178 ## [3.0.4] - 2023-10-20
182 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
183 - Use builtin retry mechanism in worker choice strategies instead of custom one.
185 ## [3.0.3] - 2023-10-19
189 - Avoid null exception at sending message to worker.
190 - Avoid null exception at checking worker node readiness.
192 ## [3.0.2] - 2023-10-17
196 - 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).
198 ## [3.0.1] - 2023-10-16
202 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
206 - Switch the worker node eventing code to `EventTarget` API.
208 ## [3.0.0] - 2023-10-08
212 - Remove Node.js 16.x.x (EOL) support.
214 ## [2.7.5] - 2023-10-03
218 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
220 ## [2.7.4] - 2023-09-25
224 - Fix source maps (bundler issue).
226 ## [2.7.3] - 2023-09-24
230 - Convert pool event emitter to event emitter async resource.
232 ## [2.7.2] - 2023-09-23
236 - Add source maps to npm package to ease debugging.
240 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
242 ## [2.7.1] - 2023-09-20
246 - Ensure worker message listener used one time are removed after usage.
248 ## [2.7.0] - 2023-09-19
252 - Fix task stealing related tasks queue options handling at runtime.
256 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
260 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
261 - Stricter worker constructor arguments validation.
263 ## [2.6.45] - 2023-09-17
267 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
271 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
272 - Add `start()` method to pool API to start the minimum number of workers.
273 - 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.
274 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
276 ## [2.6.44] - 2023-09-08
280 - Use a dedicated PAT to publish on GitHub packages registry.
284 - Publish on GitHub packages registry on release.
288 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
290 ## [2.6.43] - 2023-09-08
294 - Publish on GitHub packages registry on release.
298 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
300 ## [2.6.42] - 2023-09-06
304 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
306 ## [2.6.41] - 2023-09-03
310 - Optimize worker choice strategies implementation.
312 ## [2.6.40] - 2023-09-01
316 - Do not pre-choose in WRR worker choice strategy to avoid bias.
317 - Avoid array out of bound in worker choice strategies after worker node removal.
319 ## [2.6.39] - 2023-08-30
323 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
325 ## [2.6.38] - 2023-08-30
329 - Bundle typescript types declaration into one file.
333 - Improve interleaved weighted round robin worker choice strategy implementation.
335 ## [2.6.37] - 2023-08-28
339 - Ensure unused worker usage statistics are deleted at runtime.
343 - Rename worker choice strategy options `choiceRetries` to `retries`.
344 - Avoid unnecessary branching in worker choice strategies.
346 ## [2.6.36] - 2023-08-27
350 - Fix pool `execute()` arguments check.
354 - Make continuous tasks stealing algorithm less aggressive.
355 - Fine tune tasks stealing algorithm under back pressure.
357 ## [2.6.35] - 2023-08-25
361 - Don't account worker usage statistics for tasks that have failed.
362 - Fix pool information runtime and wait time median computation.
366 - Update simple moving average implementation to use a circular buffer.
367 - Update simple moving median implementation to use a circular buffer.
368 - Account for stolen tasks in worker usage statistics and pool information.
372 - Continuous tasks stealing algorithm.
374 ## [2.6.34] - 2023-08-24
378 - Avoid cascading tasks stealing under back pressure.
382 - Add fastpath to queued tasks rescheduling.
384 ## [2.6.33] - 2023-08-24
388 - Fix queued tasks rescheduling.
392 - Rename tasks queue options `queueMaxSize` to `size`.
396 - Task stealing scheduling algorithm if tasks queueing is enabled.
398 ## [2.6.32] - 2023-08-23
402 - Ensure no task can be executed when the pool is destroyed.
406 - Add `queueMaxSize` option to tasks queue options.
407 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
408 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
410 ## [2.6.31] - 2023-08-20
414 - Fix worker choice strategy retries mechanism in some edge cases.
418 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
419 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
421 ## [2.6.30] - 2023-08-19
425 - Ensure pool event `backPressure` is emitted.
426 - Ensure pool event `full` is emitted only once.
427 - Ensure worker node cannot be instantiated without proper arguments.
429 ## [2.6.29] - 2023-08-18
433 - Fix race condition between readiness and task functions worker message handling at startup.
434 - Fix duplicate task function worker usage statistics computation per task function.
435 - Update task function worker usage statistics if and only if there's at least two different task functions.
436 - Fix race condition at task function worker usage executing task computation leading to negative value.
440 - 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).
441 - Use back pressure detection in worker choice strategies.
442 - Add worker choice strategies retries mechanism if no worker is eligible.
444 ## [2.6.28] - 2023-08-16
448 - Ensure pool workers are properly initialized.
452 - HTTP server pool examples: express-cluster, express-hybrid.
456 - Remove now useless branching in worker hot code path.
458 ## [2.6.27] - 2023-08-15
462 - Add `KillHandler` type definition to exported types.
466 - Add `destroy` event to pool API.
468 ## [2.6.26] - 2023-08-15
472 - Add kill handler to worker options allowing to execute custom code when worker is killed.
473 - Add `listTaskFunctions()` method to pool API.
474 - SMTP client pool example: nodemailer.
476 ## [2.6.25] - 2023-08-13
480 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
481 - WebSocket server pool examples: ws-cluster, ws-hybrid.
483 ## [2.6.24] - 2023-08-12
487 - Add array of transferable objects to the `execute()` method arguments.
488 - WebSocket server pool examples: ws-worker_threads.
490 ## [2.6.23] - 2023-08-11
494 - 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.
498 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
499 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
501 ## [2.6.22] - 2023-08-10
505 - Add missing `types` field to package.json `exports`.
509 - Structure markdown documentation (PR #811).
511 ## [2.6.21] - 2023-08-03
515 - Improve code documentation.
516 - Code refactoring and cleanup for better maintainability and readability.
518 ## [2.6.20] - 2023-07-21
522 - Fix queued tasks redistribution on error task execution starvation.
523 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
527 - Drastically reduce lookups by worker in the worker nodes.
529 ## [2.6.19] - 2023-07-20
533 - Dedicated internal communication channel for worker_threads pools.
535 ## [2.6.18] - 2023-07-19
539 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
541 ## [2.6.17] - 2023-07-16
545 - Add `listTaskFunctions()` method to worker API.
547 ## [2.6.16] - 2023-07-12
551 - Fix pool startup detection.
552 - Fix worker task functions handling.
554 ## [2.6.15] - 2023-07-11
558 - Take into account worker node readiness in worker choice strategies.
560 ## [2.6.14] - 2023-07-10
564 - Fix task function statistics tracking.
566 ## [2.6.13] - 2023-07-10
570 - Add per task function statistics tracking.
571 - Add public methods to manipulate the worker task functions at runtime.
573 ## [2.6.12] - 2023-07-09
577 - Workaround import issue with `node:os` module in node 16.x.x.
579 ## [2.6.11] - 2023-07-09
583 - Fix pool readiness semantic.
585 ## [2.6.10] - 2023-07-08
589 - Ensure workers are not recreated on error at pool startup.
593 - Add `ready` and `strategy` fields to pool information.
594 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
595 - Add dynamic pool sizing checks.
597 ## [2.6.9] - 2023-07-07
601 - Recreate the right worker type on uncaught exception.
605 - Add minimum and maximum to internal measurement statistics.
606 - Add `runTime` and `waitTime` to pool information.
607 - Check worker inactive time only on dynamic worker.
609 ## [2.6.8] - 2023-07-03
613 - Brown paper bag release to fix version handling in pool information.
615 ## [2.6.7] - 2023-07-03
619 - Ensure worker queued tasks at error are reassigned to other pool workers.
623 - Add pool `utilization` ratio to pool information.
624 - Add `version` to pool information.
625 - Add worker information to worker nodes.
627 ## [2.6.6] - 2023-07-01
631 - Add safe helper `availableParallelism()` to help sizing the pool.
635 - Ensure message handler is only registered in worker.
637 ## [2.6.5] - 2023-06-27
641 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
645 - Artificial version bump to 2.6.5 to workaround publication issue.
646 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
647 - Ensure pool event is emitted before task error promise rejection.
648 - Fix queued tasks count computation.
652 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
654 ## [2.6.4] - 2023-06-27
658 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
662 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
663 - Ensure pool event is emitted before task error promise rejection.
664 - Fix queued tasks count computation.
668 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
670 ## [2.6.3] - 2023-06-19
674 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
675 - Update strategies internals after statistics computation.
679 - Optimize O(1) queue implementation.
681 ## [2.6.2] - 2023-06-12
685 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
687 ## [2.6.1] - 2023-06-10
691 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
695 - Fix average statistics computation: ensure failed tasks are not accounted.
697 ## [2.6.0] - 2023-06-09
701 - Add `LEAST_ELU` worker choice strategy (experimental).
702 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
706 - Refactor pool worker node usage internals.
707 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
708 - Breaking change: pool information `info` property object fields have been renamed.
712 - Fix wait time accounting.
713 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
714 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
716 ## [2.5.4] - 2023-06-07
720 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
724 - Compute statistics at the worker level only if needed.
725 - Add `worker_threads` options to thread pool options.
729 - Make the `LEAST_BUSY` strategy only relies on task runtime.
731 ## [2.5.3] - 2023-06-04
735 - Refine pool information content.
736 - Limit pool internals public exposure.
738 ## [2.5.2] - 2023-06-02
742 - Add `taskError` pool event for task execution error.
743 - Add pool information `info` property to pool.
744 - Emit pool information on `busy` and `full` pool events.
746 ## [2.5.1] - 2023-06-01
750 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
751 - Add `error` pool event for uncaught worker error.
753 ## [2.5.0] - 2023-05-31
757 - Switch pool event emitter to `EventEmitterAsyncResource`.
758 - Add tasks wait time accounting in per worker tasks usage.
759 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
763 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
765 ## [2.4.14] - 2023-05-09
769 - Ensure no undefined task runtime can land in the tasks history.
770 - Fix median computation implementation once again.
774 - Unit tests for median and queue implementations.
776 ## [2.4.13] - 2023-05-08
780 - Fix worker choice strategy options validation.
781 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
783 ## [2.4.12] - 2023-05-06
787 - Support multiple task functions per worker.
788 - Add custom worker weights support to worker choice strategies options.
792 - Use O(1) queue implementation for tasks queueing.
796 - Fix median computation implementation.
797 - Fix fair share worker choice strategy internals update.
799 ## [2.4.11] - 2023-04-23
803 - Optimize free worker finding in worker choice strategies.
805 ## [2.4.10] - 2023-04-15
809 - Fix typescript type definition for task function: ensure the input data is optional.
810 - Fix typescript type definition for pool execute(): ensure the input data is optional.
812 ## [2.4.9] - 2023-04-15
816 - Add tasks queue enablement runtime setter to pool.
817 - Add tasks queue options runtime setter to pool.
818 - Add worker choice strategy options runtime setter to pool.
822 - Remove the tasks queuing experimental status.
826 - Fix task function type definition and validation.
827 - Fix worker choice strategy options handling.
829 ## [2.4.8] - 2023-04-12
833 - Fix message between main worker and worker type definition for tasks.
834 - Fix code documentation.
836 ## [2.4.7] - 2023-04-11
840 - Add worker tasks queue options to pool options.
844 - Fix missing documentation.
846 ## [2.4.6] - 2023-04-10
850 - Ensure one task at a time is executed per worker with tasks queueing enabled.
851 - Properly count worker executing tasks with tasks queueing enabled.
853 ## [2.4.5] - 2023-04-09
857 - Use monotonic high resolution timer for worker tasks runtime.
858 - Add worker tasks median runtime to statistics.
859 - Add worker tasks queue (experimental).
861 ## [2.4.4] - 2023-04-07
865 - Add `PoolEvents` enumeration and `PoolEvent` type.
869 - Destroy worker only on alive check.
871 ## [2.4.3] - 2023-04-07
875 - Fix typedoc generation with inheritance.
877 ## [2.4.2] - 2023-04-06
881 - Add `full` event to dynamic pool.
882 - Keep worker choice strategy in memory for conditional reuse.
886 - Fix possible negative worker key at worker removal in worker choice strategies.
888 ## [2.4.1] - 2023-04-05
892 - Optimize worker choice strategy for dynamic pool.
896 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
898 ## [2.4.0] - 2023-04-04
902 - Add `LESS_BUSY` worker choice strategy.
906 - Optimize worker storage in pool.
907 - Optimize worker alive status check.
908 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
909 - Optimize `LESS_USED` worker choice strategy.
910 - Update benchmark versus external threads pools.
911 - Optimize tasks usage statistics requirements for worker choice strategy.
915 - Ensure trimmable characters are checked at pool initialization.
916 - Fix message id integer overflow.
917 - Fix pool worker removal in worker choice strategy internals.
918 - Fix package publication with pnpm.
920 ## [2.4.0-3] - 2023-04-04
924 - Add `LESS_BUSY` worker choice strategy.
928 - Optimize worker storage in pool.
929 - Optimize worker alive status check.
930 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
931 - Optimize `LESS_USED` worker choice strategy.
932 - Update benchmark versus external threads pools.
936 - Ensure trimmable characters are checked at pool initialization.
937 - Fix message id integer overflow.
938 - Fix pool worker removal in worker choice strategy internals.
939 - Fix package publication with pnpm.
941 ## [2.4.0-2] - 2023-04-03
945 - Add `LESS_BUSY` worker choice strategy.
949 - Optimize worker storage in pool.
950 - Optimize worker alive status check.
951 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
952 - Optimize `LESS_USED` worker choice strategy.
956 - Ensure trimmable characters are checked at pool initialization.
957 - Fix message id integer overflow.
958 - Fix pool worker removal in worker choice strategy internals.
959 - Fix package publication with pnpm.
961 ## [2.4.0-1] - 2023-04-03
965 - Add `LESS_BUSY` worker choice strategy.
969 - Optimize worker storage in pool.
970 - Optimize worker alive status check.
971 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
972 - Optimize `LESS_USED` worker choice strategy.
976 - Ensure trimmable characters are checked at pool initialization.
977 - Fix message id integer overflow.
978 - Fix pool worker removal in worker choice strategy internals.
980 ## [2.4.0-0] - 2023-04-03
984 - Add `LESS_BUSY` worker choice strategy.
988 - Optimize worker storage in pool.
989 - Optimize worker alive status check.
990 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
991 - Optimize `LESS_USED` worker choice strategy.
995 - Ensure trimmable characters are checked at pool initialization.
996 - Fix message id integer overflow.
997 - Fix pool worker removal in worker choice strategy internals.
999 ## [2.3.10] - 2023-03-18
1003 - Fix package.json `exports` syntax for ESM and CommonJS.
1007 - Permit SemVer pre-release publication.
1009 ## [2.3.10-2] - 2023-03-18
1013 - Fix package.json `exports` syntax for ESM and CommonJS.
1015 ## [2.3.10-1] - 2023-03-18
1019 - Permit SemVer pre-release publication.
1021 ## [2.3.10-0] - 2023-03-18
1025 - Fix package.json `exports` syntax for ESM and CommonJS.
1027 ## [2.3.9] - 2023-03-18
1031 - Introduce ESM module support along with CommonJS one.
1035 - Fix brown paper bag bug referencing the same object literal.
1037 ## [2.3.8] - 2023-03-18
1041 - Switch internal benchmarking code to benny.
1042 - Switch to TypeScript 5.x.x.
1043 - Switch rollup bundler plugins to core ones.
1044 - Switch to TSDoc syntax.
1045 - Enforce conventional commits.
1049 - Fix random integer generator.
1050 - Fix worker choice strategy pool type identification at initialization.
1052 ## [2.3.7] - 2022-10-23
1056 - Switch to open collective FOSS project funding platform.
1057 - Switch to ts-standard linter configuration on TypeScript code.
1061 - Fixed missing async on pool execute method.
1062 - Fixed typing in TypeScript example.
1063 - Fixed types in unit tests.
1065 ## [2.3.6] - 2022-10-22
1069 - Cleanup pool attributes and methods.
1070 - Refine error types thrown.
1074 - Fix continuous integration build on windows.
1075 - Fix code coverage reporting by using c8 instead of nyc.
1077 ## [2.3.5] - 2022-10-21
1081 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1082 - Optimize tasks usage lookup implementation.
1086 - Fix missed pool event emitter type export.
1087 - Fix typedoc documentation generation.
1089 ## [2.3.4] - 2022-10-17
1093 - Fully automate release process with release-it.
1097 - Optimize fair share task scheduling algorithm implementation.
1098 - Update benchmark versus external pools results with latest version.
1100 ## [2.3.3] - 2022-10-15
1104 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1106 ## [2.3.2] - 2022-10-14
1110 - Optimize fair share worker selection strategy implementation.
1114 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1116 ## [2.3.1] - 2022-10-13
1120 - Pool worker choice strategies:
1121 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1122 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1124 ## [2.2.2] - 2022-10-09
1128 - Fixed `README.md` file.
1130 ## [2.2.1] - 2022-10-08
1134 - Dynamic worker choice strategy change at runtime.
1136 ## [2.2.0] - 2022-01-05
1138 ### Breaking Changes
1140 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1142 ## [2.1.0] - 2021-08-29
1146 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1148 ### Breaking Changes
1150 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1151 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1152 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1153 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1155 ## [2.0.2] - 2021-05-12
1159 - Fix `busy` event emission on fixed pool type
1161 ## [2.0.1] - 2021-03-16
1165 - Check if pool options are properly set.
1166 - `busy` event is emitted on all pool types.
1168 ## [2.0.0] - 2021-03-01
1172 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1174 ### Breaking Changes
1176 - `FullPool` event is now renamed to `busy`.
1177 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1178 _Find more details on our JSDoc._
1180 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1182 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1184 ### Pool options types declaration merge
1186 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1188 #### New `export` strategy
1192 const DynamicThreadPool = require('poolifier/lib/dynamic')
1194 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1197 But you should always prefer just using
1200 const { DynamicThreadPool } = require('poolifier')
1203 #### New type definitions for input data and response
1205 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1206 _This is not a limitation by poolifier but Node.js._
1208 #### Public property replacements
1210 `numWorkers` property is now `numberOfWorkers`
1212 #### Internal (protected) properties and methods renaming
1214 These properties are not intended for end users
1216 - `id` => `nextMessageId`
1218 These methods are not intended for end users
1220 - `_chooseWorker` => `chooseWorker`
1221 - `_newWorker` => `createWorker`
1222 - `_execute` => `internalExecute`
1223 - `_chooseWorker` => `chooseWorker`
1224 - `_checkAlive` => `checkAlive`
1226 - `_runAsync` => `runAsync`
1228 ## [1.1.0] - 2020-05-21
1232 - ThreadWorker support async functions as option
1233 - Various external library patches
1235 ## [1.0.0] - 2020-01-24
1239 - FixedThreadPool implementation
1240 - DynamicThreadPool implementation
1241 - WorkerThread implementation to improve developer experience