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 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
14 ## [3.1.6] - 2023-12-18
18 - Fix pool destroying with tasks queuing enabled.
20 ## [3.1.5] - 2023-12-18
24 - Add queued tasks end timeout support to worker node termination.
26 ## [3.1.4] - 2023-12-18
30 - Make more robust the fix for possible null exception at handling task execution response.
32 ## [3.1.3] - 2023-12-17
36 - Fix possible null exception at handling task execution response.
38 ## [3.1.2] - 2023-12-17
42 - Wait for queued tasks to end at worker node termination.
44 ## [3.1.1] - 2023-12-16
48 - Fix pool options TS type definition.
50 ## [3.1.0] - 2023-12-16
54 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
56 ## [3.0.14] - 2023-12-13
60 - Fix possible null exception with worker_threads pools.
62 ## [3.0.13] - 2023-12-12
66 - Ensure worker choice strategy wait for worker nodes readiness.
70 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
72 ## [3.0.12] - 2023-12-12
76 - Add infinite retries support in worker choice strategy.
78 ## [3.0.11] - 2023-12-11
82 - Ensure pool asynchronous resource properly track tasks execution.
84 ## [3.0.10] - 2023-12-08
88 - Add a fastpath when tasks stealing or redistribution is impossible.
90 ## [3.0.9] - 2023-11-26
94 - Remove all pool events listener at pool destroying.
95 - Remove all worker node events listener at worker node destroying.
96 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
98 ## [3.0.8] - 2023-11-25
102 - Ensure continuous tasks stealing on idle start at worker node idling.
104 ## [3.0.7] - 2023-11-24
108 - Make continuous tasks stealing start at worker node idling.
110 ## [3.0.6] - 2023-11-24
114 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
115 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
117 ## [3.0.5] - 2023-10-27
121 - Ensure pool `ready` event can be emitted only once.
123 ## [3.0.4] - 2023-10-20
127 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
128 - Use builtin retry mechanism in worker choice strategies instead of custom one.
130 ## [3.0.3] - 2023-10-19
134 - Avoid null exception at sending message to worker.
135 - Avoid null exception at checking worker node readiness.
137 ## [3.0.2] - 2023-10-17
141 - 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).
143 ## [3.0.1] - 2023-10-16
147 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
151 - Switch the worker node eventing code to `EventTarget` API.
153 ## [3.0.0] - 2023-10-08
157 - Remove Node.js 16.x.x (EOL) support.
159 ## [2.7.5] - 2023-10-03
163 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
165 ## [2.7.4] - 2023-09-25
169 - Fix source maps (bundler issue).
171 ## [2.7.3] - 2023-09-24
175 - Convert pool event emitter to event emitter async resource.
177 ## [2.7.2] - 2023-09-23
181 - Add source maps to npm package to ease debugging.
185 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
187 ## [2.7.1] - 2023-09-20
191 - Ensure worker message listener used one time are removed after usage.
193 ## [2.7.0] - 2023-09-19
197 - Fix task stealing related tasks queue options handling at runtime.
201 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
205 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
206 - Stricter worker constructor arguments validation.
208 ## [2.6.45] - 2023-09-17
212 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
216 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
217 - Add `start()` method to pool API to start the minimum number of workers.
218 - 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.
219 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
221 ## [2.6.44] - 2023-09-08
225 - Use a dedicated PAT to publish on GitHub packages registry.
229 - Publish on GitHub packages registry on release.
233 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
235 ## [2.6.43] - 2023-09-08
239 - Publish on GitHub packages registry on release.
243 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
245 ## [2.6.42] - 2023-09-06
249 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
251 ## [2.6.41] - 2023-09-03
255 - Optimize worker choice strategies implementation.
257 ## [2.6.40] - 2023-09-01
261 - Do not pre-choose in WRR worker choice strategy to avoid bias.
262 - Avoid array out of bound in worker choice strategies after worker node removal.
264 ## [2.6.39] - 2023-08-30
268 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
270 ## [2.6.38] - 2023-08-30
274 - Bundle typescript types declaration into one file.
278 - Improve interleaved weighted round robin worker choice strategy implementation.
280 ## [2.6.37] - 2023-08-28
284 - Ensure unused worker usage statistics are deleted at runtime.
288 - Rename worker choice strategy options `choiceRetries` to `retries`.
289 - Avoid unnecessary branching in worker choice strategies.
291 ## [2.6.36] - 2023-08-27
295 - Fix pool `execute()` arguments check.
299 - Make continuous tasks stealing algorithm less aggressive.
300 - Fine tune tasks stealing algorithm under back pressure.
302 ## [2.6.35] - 2023-08-25
306 - Don't account worker usage statistics for tasks that have failed.
307 - Fix pool information runtime and wait time median computation.
311 - Update simple moving average implementation to use a circular buffer.
312 - Update simple moving median implementation to use a circular buffer.
313 - Account for stolen tasks in worker usage statistics and pool information.
317 - Continuous tasks stealing algorithm.
319 ## [2.6.34] - 2023-08-24
323 - Avoid cascading tasks stealing under back pressure.
327 - Add fastpath to queued tasks rescheduling.
329 ## [2.6.33] - 2023-08-24
333 - Fix queued tasks rescheduling.
337 - Rename tasks queue options `queueMaxSize` to `size`.
341 - Task stealing scheduling algorithm if tasks queueing is enabled.
343 ## [2.6.32] - 2023-08-23
347 - Ensure no task can be executed when the pool is destroyed.
351 - Add `queueMaxSize` option to tasks queue options.
352 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
353 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
355 ## [2.6.31] - 2023-08-20
359 - Fix worker choice strategy retries mechanism in some edge cases.
363 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
364 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
366 ## [2.6.30] - 2023-08-19
370 - Ensure pool event `backPressure` is emitted.
371 - Ensure pool event `full` is emitted only once.
372 - Ensure worker node cannot be instantiated without proper arguments.
374 ## [2.6.29] - 2023-08-18
378 - Fix race condition between readiness and task functions worker message handling at startup.
379 - Fix duplicate task function worker usage statistics computation per task function.
380 - Update task function worker usage statistics if and only if there's at least two different task functions.
381 - Fix race condition at task function worker usage executing task computation leading to negative value.
385 - 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).
386 - Use back pressure detection in worker choice strategies.
387 - Add worker choice strategies retries mechanism if no worker is eligible.
389 ## [2.6.28] - 2023-08-16
393 - Ensure pool workers are properly initialized.
397 - HTTP server pool examples: express-cluster, express-hybrid.
401 - Remove now useless branching in worker hot code path.
403 ## [2.6.27] - 2023-08-15
407 - Add `KillHandler` type definition to exported types.
411 - Add `destroy` event to pool API.
413 ## [2.6.26] - 2023-08-15
417 - Add kill handler to worker options allowing to execute custom code when worker is killed.
418 - Add `listTaskFunctions()` method to pool API.
419 - SMTP client pool example: nodemailer.
421 ## [2.6.25] - 2023-08-13
425 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
426 - WebSocket server pool examples: ws-cluster, ws-hybrid.
428 ## [2.6.24] - 2023-08-12
432 - Add array of transferable objects to the `execute()` method arguments.
433 - WebSocket server pool examples: ws-worker_threads.
435 ## [2.6.23] - 2023-08-11
439 - 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.
443 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
444 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
446 ## [2.6.22] - 2023-08-10
450 - Add missing `types` field to package.json `exports`.
454 - Structure markdown documentation (PR #811).
456 ## [2.6.21] - 2023-08-03
460 - Improve code documentation.
461 - Code refactoring and cleanup for better maintainability and readability.
463 ## [2.6.20] - 2023-07-21
467 - Fix queued tasks redistribution on error task execution starvation.
468 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
472 - Drastically reduce lookups by worker in the worker nodes.
474 ## [2.6.19] - 2023-07-20
478 - Dedicated internal communication channel for worker_threads pools.
480 ## [2.6.18] - 2023-07-19
484 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
486 ## [2.6.17] - 2023-07-16
490 - Add `listTaskFunctions()` method to worker API.
492 ## [2.6.16] - 2023-07-12
496 - Fix pool startup detection.
497 - Fix worker task functions handling.
499 ## [2.6.15] - 2023-07-11
503 - Take into account worker node readiness in worker choice strategies.
505 ## [2.6.14] - 2023-07-10
509 - Fix task function statistics tracking.
511 ## [2.6.13] - 2023-07-10
515 - Add per task function statistics tracking.
516 - Add public methods to manipulate the worker task functions at runtime.
518 ## [2.6.12] - 2023-07-09
522 - Workaround import issue with `node:os` module in node 16.x.x.
524 ## [2.6.11] - 2023-07-09
528 - Fix pool readiness semantic.
530 ## [2.6.10] - 2023-07-08
534 - Ensure workers are not recreated on error at pool startup.
538 - Add `ready` and `strategy` fields to pool information.
539 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
540 - Add dynamic pool sizing checks.
542 ## [2.6.9] - 2023-07-07
546 - Recreate the right worker type on uncaught exception.
550 - Add minimum and maximum to internal measurement statistics.
551 - Add `runTime` and `waitTime` to pool information.
552 - Check worker inactive time only on dynamic worker.
554 ## [2.6.8] - 2023-07-03
558 - Brown paper bag release to fix version handling in pool information.
560 ## [2.6.7] - 2023-07-03
564 - Ensure worker queued tasks at error are reassigned to other pool workers.
568 - Add pool `utilization` ratio to pool information.
569 - Add `version` to pool information.
570 - Add worker information to worker nodes.
572 ## [2.6.6] - 2023-07-01
576 - Add safe helper `availableParallelism()` to help sizing the pool.
580 - Ensure message handler is only registered in worker.
582 ## [2.6.5] - 2023-06-27
586 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
590 - Artificial version bump to 2.6.5 to workaround publication issue.
591 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
592 - Ensure pool event is emitted before task error promise rejection.
593 - Fix queued tasks count computation.
597 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
599 ## [2.6.4] - 2023-06-27
603 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
607 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
608 - Ensure pool event is emitted before task error promise rejection.
609 - Fix queued tasks count computation.
613 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
615 ## [2.6.3] - 2023-06-19
619 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
620 - Update strategies internals after statistics computation.
624 - Optimize O(1) queue implementation.
626 ## [2.6.2] - 2023-06-12
630 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
632 ## [2.6.1] - 2023-06-10
636 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
640 - Fix average statistics computation: ensure failed tasks are not accounted.
642 ## [2.6.0] - 2023-06-09
646 - Add `LEAST_ELU` worker choice strategy (experimental).
647 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
651 - Refactor pool worker node usage internals.
652 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
653 - Breaking change: pool information `info` property object fields have been renamed.
657 - Fix wait time accounting.
658 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
659 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
661 ## [2.5.4] - 2023-06-07
665 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
669 - Compute statistics at the worker level only if needed.
670 - Add `worker_threads` options to thread pool options.
674 - Make the `LEAST_BUSY` strategy only relies on task runtime.
676 ## [2.5.3] - 2023-06-04
680 - Refine pool information content.
681 - Limit pool internals public exposure.
683 ## [2.5.2] - 2023-06-02
687 - Add `taskError` pool event for task execution error.
688 - Add pool information `info` property to pool.
689 - Emit pool information on `busy` and `full` pool events.
691 ## [2.5.1] - 2023-06-01
695 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
696 - Add `error` pool event for uncaught worker error.
698 ## [2.5.0] - 2023-05-31
702 - Switch pool event emitter to `EventEmitterAsyncResource`.
703 - Add tasks wait time accounting in per worker tasks usage.
704 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
708 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
710 ## [2.4.14] - 2023-05-09
714 - Ensure no undefined task runtime can land in the tasks history.
715 - Fix median computation implementation once again.
719 - Unit tests for median and queue implementations.
721 ## [2.4.13] - 2023-05-08
725 - Fix worker choice strategy options validation.
726 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
728 ## [2.4.12] - 2023-05-06
732 - Support multiple task functions per worker.
733 - Add custom worker weights support to worker choice strategies options.
737 - Use O(1) queue implementation for tasks queueing.
741 - Fix median computation implementation.
742 - Fix fair share worker choice strategy internals update.
744 ## [2.4.11] - 2023-04-23
748 - Optimize free worker finding in worker choice strategies.
750 ## [2.4.10] - 2023-04-15
754 - Fix typescript type definition for task function: ensure the input data is optional.
755 - Fix typescript type definition for pool execute(): ensure the input data is optional.
757 ## [2.4.9] - 2023-04-15
761 - Add tasks queue enablement runtime setter to pool.
762 - Add tasks queue options runtime setter to pool.
763 - Add worker choice strategy options runtime setter to pool.
767 - Remove the tasks queuing experimental status.
771 - Fix task function type definition and validation.
772 - Fix worker choice strategy options handling.
774 ## [2.4.8] - 2023-04-12
778 - Fix message between main worker and worker type definition for tasks.
779 - Fix code documentation.
781 ## [2.4.7] - 2023-04-11
785 - Add worker tasks queue options to pool options.
789 - Fix missing documentation.
791 ## [2.4.6] - 2023-04-10
795 - Ensure one task at a time is executed per worker with tasks queueing enabled.
796 - Properly count worker executing tasks with tasks queueing enabled.
798 ## [2.4.5] - 2023-04-09
802 - Use monotonic high resolution timer for worker tasks runtime.
803 - Add worker tasks median runtime to statistics.
804 - Add worker tasks queue (experimental).
806 ## [2.4.4] - 2023-04-07
810 - Add `PoolEvents` enumeration and `PoolEvent` type.
814 - Destroy worker only on alive check.
816 ## [2.4.3] - 2023-04-07
820 - Fix typedoc generation with inheritance.
822 ## [2.4.2] - 2023-04-06
826 - Add `full` event to dynamic pool.
827 - Keep worker choice strategy in memory for conditional reuse.
831 - Fix possible negative worker key at worker removal in worker choice strategies.
833 ## [2.4.1] - 2023-04-05
837 - Optimize worker choice strategy for dynamic pool.
841 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
843 ## [2.4.0] - 2023-04-04
847 - Add `LESS_BUSY` worker choice strategy.
851 - Optimize worker storage in pool.
852 - Optimize worker alive status check.
853 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
854 - Optimize `LESS_USED` worker choice strategy.
855 - Update benchmark versus external threads pools.
856 - Optimize tasks usage statistics requirements for worker choice strategy.
860 - Ensure trimmable characters are checked at pool initialization.
861 - Fix message id integer overflow.
862 - Fix pool worker removal in worker choice strategy internals.
863 - Fix package publication with pnpm.
865 ## [2.4.0-3] - 2023-04-04
869 - Add `LESS_BUSY` worker choice strategy.
873 - Optimize worker storage in pool.
874 - Optimize worker alive status check.
875 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
876 - Optimize `LESS_USED` worker choice strategy.
877 - Update benchmark versus external threads pools.
881 - Ensure trimmable characters are checked at pool initialization.
882 - Fix message id integer overflow.
883 - Fix pool worker removal in worker choice strategy internals.
884 - Fix package publication with pnpm.
886 ## [2.4.0-2] - 2023-04-03
890 - Add `LESS_BUSY` worker choice strategy.
894 - Optimize worker storage in pool.
895 - Optimize worker alive status check.
896 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
897 - Optimize `LESS_USED` worker choice strategy.
901 - Ensure trimmable characters are checked at pool initialization.
902 - Fix message id integer overflow.
903 - Fix pool worker removal in worker choice strategy internals.
904 - Fix package publication with pnpm.
906 ## [2.4.0-1] - 2023-04-03
910 - Add `LESS_BUSY` worker choice strategy.
914 - Optimize worker storage in pool.
915 - Optimize worker alive status check.
916 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
917 - Optimize `LESS_USED` worker choice strategy.
921 - Ensure trimmable characters are checked at pool initialization.
922 - Fix message id integer overflow.
923 - Fix pool worker removal in worker choice strategy internals.
925 ## [2.4.0-0] - 2023-04-03
929 - Add `LESS_BUSY` worker choice strategy.
933 - Optimize worker storage in pool.
934 - Optimize worker alive status check.
935 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
936 - Optimize `LESS_USED` worker choice strategy.
940 - Ensure trimmable characters are checked at pool initialization.
941 - Fix message id integer overflow.
942 - Fix pool worker removal in worker choice strategy internals.
944 ## [2.3.10] - 2023-03-18
948 - Fix package.json `exports` syntax for ESM and CommonJS.
952 - Permit SemVer pre-release publication.
954 ## [2.3.10-2] - 2023-03-18
958 - Fix package.json `exports` syntax for ESM and CommonJS.
960 ## [2.3.10-1] - 2023-03-18
964 - Permit SemVer pre-release publication.
966 ## [2.3.10-0] - 2023-03-18
970 - Fix package.json `exports` syntax for ESM and CommonJS.
972 ## [2.3.9] - 2023-03-18
976 - Introduce ESM module support along with CommonJS one.
980 - Fix brown paper bag bug referencing the same object literal.
982 ## [2.3.8] - 2023-03-18
986 - Switch internal benchmarking code to benny.
987 - Switch to TypeScript 5.x.x.
988 - Switch rollup bundler plugins to core ones.
989 - Switch to TSDoc syntax.
990 - Enforce conventional commits.
994 - Fix random integer generator.
995 - Fix worker choice strategy pool type identification at initialization.
997 ## [2.3.7] - 2022-10-23
1001 - Switch to open collective FOSS project funding platform.
1002 - Switch to ts-standard linter configuration on TypeScript code.
1006 - Fixed missing async on pool execute method.
1007 - Fixed typing in TypeScript example.
1008 - Fixed types in unit tests.
1010 ## [2.3.6] - 2022-10-22
1014 - Cleanup pool attributes and methods.
1015 - Refine error types thrown.
1019 - Fix continuous integration build on windows.
1020 - Fix code coverage reporting by using c8 instead of nyc.
1022 ## [2.3.5] - 2022-10-21
1026 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1027 - Optimize tasks usage lookup implementation.
1031 - Fix missed pool event emitter type export.
1032 - Fix typedoc documentation generation.
1034 ## [2.3.4] - 2022-10-17
1038 - Fully automate release process with release-it.
1042 - Optimize fair share task scheduling algorithm implementation.
1043 - Update benchmark versus external pools results with latest version.
1045 ## [2.3.3] - 2022-10-15
1049 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1051 ## [2.3.2] - 2022-10-14
1055 - Optimize fair share worker selection strategy implementation.
1059 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1061 ## [2.3.1] - 2022-10-13
1065 - Pool worker choice strategies:
1066 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1067 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1069 ## [2.2.2] - 2022-10-09
1073 - Fixed `README.md` file.
1075 ## [2.2.1] - 2022-10-08
1079 - Dynamic worker choice strategy change at runtime.
1081 ## [2.2.0] - 2022-01-05
1083 ### Breaking Changes
1085 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1087 ## [2.1.0] - 2021-08-29
1091 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1093 ### Breaking Changes
1095 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1096 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1097 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1098 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1100 ## [2.0.2] - 2021-05-12
1104 - Fix `busy` event emission on fixed pool type
1106 ## [2.0.1] - 2021-03-16
1110 - Check if pool options are properly set.
1111 - `busy` event is emitted on all pool types.
1113 ## [2.0.0] - 2021-03-01
1117 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1119 ### Breaking Changes
1121 - `FullPool` event is now renamed to `busy`.
1122 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1123 _Find more details on our JSDoc._
1125 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1127 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1129 ### Pool options types declaration merge
1131 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1133 #### New `export` strategy
1137 const DynamicThreadPool = require('poolifier/lib/dynamic')
1139 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1142 But you should always prefer just using
1145 const { DynamicThreadPool } = require('poolifier')
1148 #### New type definitions for input data and response
1150 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1151 _This is not a limitation by poolifier but Node.js._
1153 #### Public property replacements
1155 `numWorkers` property is now `numberOfWorkers`
1157 #### Internal (protected) properties and methods renaming
1159 These properties are not intended for end users
1161 - `id` => `nextMessageId`
1163 These methods are not intended for end users
1165 - `_chooseWorker` => `chooseWorker`
1166 - `_newWorker` => `createWorker`
1167 - `_execute` => `internalExecute`
1168 - `_chooseWorker` => `chooseWorker`
1169 - `_checkAlive` => `checkAlive`
1171 - `_runAsync` => `runAsync`
1173 ## [1.1.0] - 2020-05-21
1177 - ThreadWorker support async functions as option
1178 - Various external library patches
1180 ## [1.0.0] - 2020-01-24
1184 - FixedThreadPool implementation
1185 - DynamicThreadPool implementation
1186 - WorkerThread implementation to improve developer experience