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 ## [3.1.14] - 2024-01-01
14 - Properly handle dynamic pool with zero minimum size.
16 ## [3.1.13] - 2023-12-30
20 - Reduce branching in several hot code paths.
21 - Use faster object cloning implementation.
23 ## [3.1.12] - 2023-12-27
27 - Fix tasks redistribution triggers at pool destroying.
31 - Switch TypeScript module resolution to Node16.
33 ## [3.1.12-0] - 2023-12-27
37 - Fix tasks redistribution triggers at pool destroying.
39 ## [3.1.11] - 2023-12-24
43 - Avoid worker node cross tasks stealing.
44 - Ensure only half the pool worker nodes can steal tasks.
46 ## [3.1.10] - 2023-12-23
50 - Avoid useless branching on pool type.
52 ## [3.1.9] - 2023-12-22
56 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
58 ## [3.1.8] - 2023-12-21
62 - Fix default worker weight computation.
63 - Fix possible null exception at pool destroying.
65 ## [3.1.7] - 2023-12-20
69 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
71 ## [3.1.6] - 2023-12-18
75 - Fix pool destroying with tasks queuing enabled.
77 ## [3.1.5] - 2023-12-18
81 - Add queued tasks end timeout support to worker node termination.
83 ## [3.1.4] - 2023-12-18
87 - Make more robust the fix for possible null exception at handling task execution response.
89 ## [3.1.3] - 2023-12-17
93 - Fix possible null exception at handling task execution response.
95 ## [3.1.2] - 2023-12-17
99 - Wait for queued tasks to end at worker node termination.
101 ## [3.1.1] - 2023-12-16
105 - Fix pool options TS type definition.
107 ## [3.1.0] - 2023-12-16
111 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
113 ## [3.0.14] - 2023-12-13
117 - Fix possible null exception with worker_threads pools.
119 ## [3.0.13] - 2023-12-12
123 - Ensure worker choice strategy wait for worker nodes readiness.
127 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
129 ## [3.0.12] - 2023-12-12
133 - Add infinite retries support in worker choice strategy.
135 ## [3.0.11] - 2023-12-11
139 - Ensure pool asynchronous resource properly track tasks execution.
141 ## [3.0.10] - 2023-12-08
145 - Add a fastpath when tasks stealing or redistribution is impossible.
147 ## [3.0.9] - 2023-11-26
151 - Remove all pool events listener at pool destroying.
152 - Remove all worker node events listener at worker node destroying.
153 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
155 ## [3.0.8] - 2023-11-25
159 - Ensure continuous tasks stealing on idle start at worker node idling.
161 ## [3.0.7] - 2023-11-24
165 - Make continuous tasks stealing start at worker node idling.
167 ## [3.0.6] - 2023-11-24
171 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
172 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
174 ## [3.0.5] - 2023-10-27
178 - Ensure pool `ready` event can be emitted only once.
180 ## [3.0.4] - 2023-10-20
184 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
185 - Use builtin retry mechanism in worker choice strategies instead of custom one.
187 ## [3.0.3] - 2023-10-19
191 - Avoid null exception at sending message to worker.
192 - Avoid null exception at checking worker node readiness.
194 ## [3.0.2] - 2023-10-17
198 - 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).
200 ## [3.0.1] - 2023-10-16
204 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
208 - Switch the worker node eventing code to `EventTarget` API.
210 ## [3.0.0] - 2023-10-08
214 - Remove Node.js 16.x.x (EOL) support.
216 ## [2.7.5] - 2023-10-03
220 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
222 ## [2.7.4] - 2023-09-25
226 - Fix source maps (bundler issue).
228 ## [2.7.3] - 2023-09-24
232 - Convert pool event emitter to event emitter async resource.
234 ## [2.7.2] - 2023-09-23
238 - Add source maps to npm package to ease debugging.
242 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
244 ## [2.7.1] - 2023-09-20
248 - Ensure worker message listener used one time are removed after usage.
250 ## [2.7.0] - 2023-09-19
254 - Fix task stealing related tasks queue options handling at runtime.
258 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
262 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
263 - Stricter worker constructor arguments validation.
265 ## [2.6.45] - 2023-09-17
269 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
273 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
274 - Add `start()` method to pool API to start the minimum number of workers.
275 - 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.
276 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
278 ## [2.6.44] - 2023-09-08
282 - Use a dedicated PAT to publish on GitHub packages registry.
286 - Publish on GitHub packages registry on release.
290 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
292 ## [2.6.43] - 2023-09-08
296 - Publish on GitHub packages registry on release.
300 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
302 ## [2.6.42] - 2023-09-06
306 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
308 ## [2.6.41] - 2023-09-03
312 - Optimize worker choice strategies implementation.
314 ## [2.6.40] - 2023-09-01
318 - Do not pre-choose in WRR worker choice strategy to avoid bias.
319 - Avoid array out of bound in worker choice strategies after worker node removal.
321 ## [2.6.39] - 2023-08-30
325 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
327 ## [2.6.38] - 2023-08-30
331 - Bundle typescript types declaration into one file.
335 - Improve interleaved weighted round robin worker choice strategy implementation.
337 ## [2.6.37] - 2023-08-28
341 - Ensure unused worker usage statistics are deleted at runtime.
345 - Rename worker choice strategy options `choiceRetries` to `retries`.
346 - Avoid unnecessary branching in worker choice strategies.
348 ## [2.6.36] - 2023-08-27
352 - Fix pool `execute()` arguments check.
356 - Make continuous tasks stealing algorithm less aggressive.
357 - Fine tune tasks stealing algorithm under back pressure.
359 ## [2.6.35] - 2023-08-25
363 - Don't account worker usage statistics for tasks that have failed.
364 - Fix pool information runtime and wait time median computation.
368 - Update simple moving average implementation to use a circular buffer.
369 - Update simple moving median implementation to use a circular buffer.
370 - Account for stolen tasks in worker usage statistics and pool information.
374 - Continuous tasks stealing algorithm.
376 ## [2.6.34] - 2023-08-24
380 - Avoid cascading tasks stealing under back pressure.
384 - Add fastpath to queued tasks rescheduling.
386 ## [2.6.33] - 2023-08-24
390 - Fix queued tasks rescheduling.
394 - Rename tasks queue options `queueMaxSize` to `size`.
398 - Task stealing scheduling algorithm if tasks queueing is enabled.
400 ## [2.6.32] - 2023-08-23
404 - Ensure no task can be executed when the pool is destroyed.
408 - Add `queueMaxSize` option to tasks queue options.
409 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
410 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
412 ## [2.6.31] - 2023-08-20
416 - Fix worker choice strategy retries mechanism in some edge cases.
420 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
421 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
423 ## [2.6.30] - 2023-08-19
427 - Ensure pool event `backPressure` is emitted.
428 - Ensure pool event `full` is emitted only once.
429 - Ensure worker node cannot be instantiated without proper arguments.
431 ## [2.6.29] - 2023-08-18
435 - Fix race condition between readiness and task functions worker message handling at startup.
436 - Fix duplicate task function worker usage statistics computation per task function.
437 - Update task function worker usage statistics if and only if there's at least two different task functions.
438 - Fix race condition at task function worker usage executing task computation leading to negative value.
442 - 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).
443 - Use back pressure detection in worker choice strategies.
444 - Add worker choice strategies retries mechanism if no worker is eligible.
446 ## [2.6.28] - 2023-08-16
450 - Ensure pool workers are properly initialized.
454 - HTTP server pool examples: express-cluster, express-hybrid.
458 - Remove now useless branching in worker hot code path.
460 ## [2.6.27] - 2023-08-15
464 - Add `KillHandler` type definition to exported types.
468 - Add `destroy` event to pool API.
470 ## [2.6.26] - 2023-08-15
474 - Add kill handler to worker options allowing to execute custom code when worker is killed.
475 - Add `listTaskFunctions()` method to pool API.
476 - SMTP client pool example: nodemailer.
478 ## [2.6.25] - 2023-08-13
482 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
483 - WebSocket server pool examples: ws-cluster, ws-hybrid.
485 ## [2.6.24] - 2023-08-12
489 - Add array of transferable objects to the `execute()` method arguments.
490 - WebSocket server pool examples: ws-worker_threads.
492 ## [2.6.23] - 2023-08-11
496 - 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.
500 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
501 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
503 ## [2.6.22] - 2023-08-10
507 - Add missing `types` field to package.json `exports`.
511 - Structure markdown documentation (PR #811).
513 ## [2.6.21] - 2023-08-03
517 - Improve code documentation.
518 - Code refactoring and cleanup for better maintainability and readability.
520 ## [2.6.20] - 2023-07-21
524 - Fix queued tasks redistribution on error task execution starvation.
525 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
529 - Drastically reduce lookups by worker in the worker nodes.
531 ## [2.6.19] - 2023-07-20
535 - Dedicated internal communication channel for worker_threads pools.
537 ## [2.6.18] - 2023-07-19
541 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
543 ## [2.6.17] - 2023-07-16
547 - Add `listTaskFunctions()` method to worker API.
549 ## [2.6.16] - 2023-07-12
553 - Fix pool startup detection.
554 - Fix worker task functions handling.
556 ## [2.6.15] - 2023-07-11
560 - Take into account worker node readiness in worker choice strategies.
562 ## [2.6.14] - 2023-07-10
566 - Fix task function statistics tracking.
568 ## [2.6.13] - 2023-07-10
572 - Add per task function statistics tracking.
573 - Add public methods to manipulate the worker task functions at runtime.
575 ## [2.6.12] - 2023-07-09
579 - Workaround import issue with `node:os` module in node 16.x.x.
581 ## [2.6.11] - 2023-07-09
585 - Fix pool readiness semantic.
587 ## [2.6.10] - 2023-07-08
591 - Ensure workers are not recreated on error at pool startup.
595 - Add `ready` and `strategy` fields to pool information.
596 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
597 - Add dynamic pool sizing checks.
599 ## [2.6.9] - 2023-07-07
603 - Recreate the right worker type on uncaught exception.
607 - Add minimum and maximum to internal measurement statistics.
608 - Add `runTime` and `waitTime` to pool information.
609 - Check worker inactive time only on dynamic worker.
611 ## [2.6.8] - 2023-07-03
615 - Brown paper bag release to fix version handling in pool information.
617 ## [2.6.7] - 2023-07-03
621 - Ensure worker queued tasks at error are reassigned to other pool workers.
625 - Add pool `utilization` ratio to pool information.
626 - Add `version` to pool information.
627 - Add worker information to worker nodes.
629 ## [2.6.6] - 2023-07-01
633 - Add safe helper `availableParallelism()` to help sizing the pool.
637 - Ensure message handler is only registered in worker.
639 ## [2.6.5] - 2023-06-27
643 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
647 - Artificial version bump to 2.6.5 to workaround publication issue.
648 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
649 - Ensure pool event is emitted before task error promise rejection.
650 - Fix queued tasks count computation.
654 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
656 ## [2.6.4] - 2023-06-27
660 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
664 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
665 - Ensure pool event is emitted before task error promise rejection.
666 - Fix queued tasks count computation.
670 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
672 ## [2.6.3] - 2023-06-19
676 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
677 - Update strategies internals after statistics computation.
681 - Optimize O(1) queue implementation.
683 ## [2.6.2] - 2023-06-12
687 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
689 ## [2.6.1] - 2023-06-10
693 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
697 - Fix average statistics computation: ensure failed tasks are not accounted.
699 ## [2.6.0] - 2023-06-09
703 - Add `LEAST_ELU` worker choice strategy (experimental).
704 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
708 - Refactor pool worker node usage internals.
709 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
710 - Breaking change: pool information `info` property object fields have been renamed.
714 - Fix wait time accounting.
715 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
716 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
718 ## [2.5.4] - 2023-06-07
722 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
726 - Compute statistics at the worker level only if needed.
727 - Add `worker_threads` options to thread pool options.
731 - Make the `LEAST_BUSY` strategy only relies on task runtime.
733 ## [2.5.3] - 2023-06-04
737 - Refine pool information content.
738 - Limit pool internals public exposure.
740 ## [2.5.2] - 2023-06-02
744 - Add `taskError` pool event for task execution error.
745 - Add pool information `info` property to pool.
746 - Emit pool information on `busy` and `full` pool events.
748 ## [2.5.1] - 2023-06-01
752 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
753 - Add `error` pool event for uncaught worker error.
755 ## [2.5.0] - 2023-05-31
759 - Switch pool event emitter to `EventEmitterAsyncResource`.
760 - Add tasks wait time accounting in per worker tasks usage.
761 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
765 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
767 ## [2.4.14] - 2023-05-09
771 - Ensure no undefined task runtime can land in the tasks history.
772 - Fix median computation implementation once again.
776 - Unit tests for median and queue implementations.
778 ## [2.4.13] - 2023-05-08
782 - Fix worker choice strategy options validation.
783 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
785 ## [2.4.12] - 2023-05-06
789 - Support multiple task functions per worker.
790 - Add custom worker weights support to worker choice strategies options.
794 - Use O(1) queue implementation for tasks queueing.
798 - Fix median computation implementation.
799 - Fix fair share worker choice strategy internals update.
801 ## [2.4.11] - 2023-04-23
805 - Optimize free worker finding in worker choice strategies.
807 ## [2.4.10] - 2023-04-15
811 - Fix typescript type definition for task function: ensure the input data is optional.
812 - Fix typescript type definition for pool execute(): ensure the input data is optional.
814 ## [2.4.9] - 2023-04-15
818 - Add tasks queue enablement runtime setter to pool.
819 - Add tasks queue options runtime setter to pool.
820 - Add worker choice strategy options runtime setter to pool.
824 - Remove the tasks queuing experimental status.
828 - Fix task function type definition and validation.
829 - Fix worker choice strategy options handling.
831 ## [2.4.8] - 2023-04-12
835 - Fix message between main worker and worker type definition for tasks.
836 - Fix code documentation.
838 ## [2.4.7] - 2023-04-11
842 - Add worker tasks queue options to pool options.
846 - Fix missing documentation.
848 ## [2.4.6] - 2023-04-10
852 - Ensure one task at a time is executed per worker with tasks queueing enabled.
853 - Properly count worker executing tasks with tasks queueing enabled.
855 ## [2.4.5] - 2023-04-09
859 - Use monotonic high resolution timer for worker tasks runtime.
860 - Add worker tasks median runtime to statistics.
861 - Add worker tasks queue (experimental).
863 ## [2.4.4] - 2023-04-07
867 - Add `PoolEvents` enumeration and `PoolEvent` type.
871 - Destroy worker only on alive check.
873 ## [2.4.3] - 2023-04-07
877 - Fix typedoc generation with inheritance.
879 ## [2.4.2] - 2023-04-06
883 - Add `full` event to dynamic pool.
884 - Keep worker choice strategy in memory for conditional reuse.
888 - Fix possible negative worker key at worker removal in worker choice strategies.
890 ## [2.4.1] - 2023-04-05
894 - Optimize worker choice strategy for dynamic pool.
898 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
900 ## [2.4.0] - 2023-04-04
904 - Add `LESS_BUSY` worker choice strategy.
908 - Optimize worker storage in pool.
909 - Optimize worker alive status check.
910 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
911 - Optimize `LESS_USED` worker choice strategy.
912 - Update benchmark versus external threads pools.
913 - Optimize tasks usage statistics requirements for worker choice strategy.
917 - Ensure trimmable characters are checked at pool initialization.
918 - Fix message id integer overflow.
919 - Fix pool worker removal in worker choice strategy internals.
920 - Fix package publication with pnpm.
922 ## [2.4.0-3] - 2023-04-04
926 - Add `LESS_BUSY` worker choice strategy.
930 - Optimize worker storage in pool.
931 - Optimize worker alive status check.
932 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
933 - Optimize `LESS_USED` worker choice strategy.
934 - Update benchmark versus external threads pools.
938 - Ensure trimmable characters are checked at pool initialization.
939 - Fix message id integer overflow.
940 - Fix pool worker removal in worker choice strategy internals.
941 - Fix package publication with pnpm.
943 ## [2.4.0-2] - 2023-04-03
947 - Add `LESS_BUSY` worker choice strategy.
951 - Optimize worker storage in pool.
952 - Optimize worker alive status check.
953 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
954 - Optimize `LESS_USED` worker choice strategy.
958 - Ensure trimmable characters are checked at pool initialization.
959 - Fix message id integer overflow.
960 - Fix pool worker removal in worker choice strategy internals.
961 - Fix package publication with pnpm.
963 ## [2.4.0-1] - 2023-04-03
967 - Add `LESS_BUSY` worker choice strategy.
971 - Optimize worker storage in pool.
972 - Optimize worker alive status check.
973 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
974 - Optimize `LESS_USED` worker choice strategy.
978 - Ensure trimmable characters are checked at pool initialization.
979 - Fix message id integer overflow.
980 - Fix pool worker removal in worker choice strategy internals.
982 ## [2.4.0-0] - 2023-04-03
986 - Add `LESS_BUSY` worker choice strategy.
990 - Optimize worker storage in pool.
991 - Optimize worker alive status check.
992 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
993 - Optimize `LESS_USED` worker choice strategy.
997 - Ensure trimmable characters are checked at pool initialization.
998 - Fix message id integer overflow.
999 - Fix pool worker removal in worker choice strategy internals.
1001 ## [2.3.10] - 2023-03-18
1005 - Fix package.json `exports` syntax for ESM and CommonJS.
1009 - Permit SemVer pre-release publication.
1011 ## [2.3.10-2] - 2023-03-18
1015 - Fix package.json `exports` syntax for ESM and CommonJS.
1017 ## [2.3.10-1] - 2023-03-18
1021 - Permit SemVer pre-release publication.
1023 ## [2.3.10-0] - 2023-03-18
1027 - Fix package.json `exports` syntax for ESM and CommonJS.
1029 ## [2.3.9] - 2023-03-18
1033 - Introduce ESM module support along with CommonJS one.
1037 - Fix brown paper bag bug referencing the same object literal.
1039 ## [2.3.8] - 2023-03-18
1043 - Switch internal benchmarking code to benny.
1044 - Switch to TypeScript 5.x.x.
1045 - Switch rollup bundler plugins to core ones.
1046 - Switch to TSDoc syntax.
1047 - Enforce conventional commits.
1051 - Fix random integer generator.
1052 - Fix worker choice strategy pool type identification at initialization.
1054 ## [2.3.7] - 2022-10-23
1058 - Switch to open collective FOSS project funding platform.
1059 - Switch to ts-standard linter configuration on TypeScript code.
1063 - Fixed missing async on pool execute method.
1064 - Fixed typing in TypeScript example.
1065 - Fixed types in unit tests.
1067 ## [2.3.6] - 2022-10-22
1071 - Cleanup pool attributes and methods.
1072 - Refine error types thrown.
1076 - Fix continuous integration build on windows.
1077 - Fix code coverage reporting by using c8 instead of nyc.
1079 ## [2.3.5] - 2022-10-21
1083 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1084 - Optimize tasks usage lookup implementation.
1088 - Fix missed pool event emitter type export.
1089 - Fix typedoc documentation generation.
1091 ## [2.3.4] - 2022-10-17
1095 - Fully automate release process with release-it.
1099 - Optimize fair share task scheduling algorithm implementation.
1100 - Update benchmark versus external pools results with latest version.
1102 ## [2.3.3] - 2022-10-15
1106 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1108 ## [2.3.2] - 2022-10-14
1112 - Optimize fair share worker selection strategy implementation.
1116 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1118 ## [2.3.1] - 2022-10-13
1122 - Pool worker choice strategies:
1123 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1124 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1126 ## [2.2.2] - 2022-10-09
1130 - Fixed `README.md` file.
1132 ## [2.2.1] - 2022-10-08
1136 - Dynamic worker choice strategy change at runtime.
1138 ## [2.2.0] - 2022-01-05
1140 ### Breaking Changes
1142 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1144 ## [2.1.0] - 2021-08-29
1148 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1150 ### Breaking Changes
1152 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1153 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1154 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1155 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1157 ## [2.0.2] - 2021-05-12
1161 - Fix `busy` event emission on fixed pool type
1163 ## [2.0.1] - 2021-03-16
1167 - Check if pool options are properly set.
1168 - `busy` event is emitted on all pool types.
1170 ## [2.0.0] - 2021-03-01
1174 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1176 ### Breaking Changes
1178 - `FullPool` event is now renamed to `busy`.
1179 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1180 _Find more details on our JSDoc._
1182 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1184 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1186 ### Pool options types declaration merge
1188 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1190 #### New `export` strategy
1194 const DynamicThreadPool = require('poolifier/lib/dynamic')
1196 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1199 But you should always prefer just using
1202 const { DynamicThreadPool } = require('poolifier')
1205 #### New type definitions for input data and response
1207 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1208 _This is not a limitation by poolifier but Node.js._
1210 #### Public property replacements
1212 `numWorkers` property is now `numberOfWorkers`
1214 #### Internal (protected) properties and methods renaming
1216 These properties are not intended for end users
1218 - `id` => `nextMessageId`
1220 These methods are not intended for end users
1222 - `_chooseWorker` => `chooseWorker`
1223 - `_newWorker` => `createWorker`
1224 - `_execute` => `internalExecute`
1225 - `_chooseWorker` => `chooseWorker`
1226 - `_checkAlive` => `checkAlive`
1228 - `_runAsync` => `runAsync`
1230 ## [1.1.0] - 2020-05-21
1234 - ThreadWorker support async functions as option
1235 - Various external library patches
1237 ## [1.0.0] - 2020-01-24
1241 - FixedThreadPool implementation
1242 - DynamicThreadPool implementation
1243 - WorkerThread implementation to improve developer experience