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 ## [3.1.0] - 2023-12-16
14 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
16 ## [3.0.14] - 2023-12-13
20 - Fix possible null exception with worker_threads pools.
22 ## [3.0.13] - 2023-12-12
26 - Ensure worker choice strategy wait for worker nodes readiness.
30 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
32 ## [3.0.12] - 2023-12-12
36 - Add infinite retries support in worker choice strategy.
38 ## [3.0.11] - 2023-12-11
42 - Ensure pool asynchronous resource properly track tasks execution.
44 ## [3.0.10] - 2023-12-08
48 - Add a fastpath when tasks stealing or redistribution is impossible.
50 ## [3.0.9] - 2023-11-26
54 - Remove all pool events listener at pool destroying.
55 - Remove all worker node events listener at worker node destroying.
56 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
58 ## [3.0.8] - 2023-11-25
62 - Ensure continuous tasks stealing on idle start at worker node idling.
64 ## [3.0.7] - 2023-11-24
68 - Make continuous tasks stealing start at worker node idling.
70 ## [3.0.6] - 2023-11-24
74 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
75 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
77 ## [3.0.5] - 2023-10-27
81 - Ensure pool `ready` event can be emitted only once.
83 ## [3.0.4] - 2023-10-20
87 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
88 - Use builtin retry mechanism in worker choice strategies instead of custom one.
90 ## [3.0.3] - 2023-10-19
94 - Avoid null exception at sending message to worker.
95 - Avoid null exception at checking worker node readiness.
97 ## [3.0.2] - 2023-10-17
101 - 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).
103 ## [3.0.1] - 2023-10-16
107 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
111 - Switch the worker node eventing code to `EventTarget` API.
113 ## [3.0.0] - 2023-10-08
117 - Remove Node.js 16.x.x (EOL) support.
119 ## [2.7.5] - 2023-10-03
123 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
125 ## [2.7.4] - 2023-09-25
129 - Fix source maps (bundler issue).
131 ## [2.7.3] - 2023-09-24
135 - Convert pool event emitter to event emitter async resource.
137 ## [2.7.2] - 2023-09-23
141 - Add source maps to npm package to ease debugging.
145 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
147 ## [2.7.1] - 2023-09-20
151 - Ensure worker message listener used one time are removed after usage.
153 ## [2.7.0] - 2023-09-19
157 - Fix task stealing related tasks queue options handling at runtime.
161 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
165 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
166 - Stricter worker constructor arguments validation.
168 ## [2.6.45] - 2023-09-17
172 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
176 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
177 - Add `start()` method to pool API to start the minimum number of workers.
178 - 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.
179 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
181 ## [2.6.44] - 2023-09-08
185 - Use a dedicated PAT to publish on GitHub packages registry.
189 - Publish on GitHub packages registry on release.
193 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
195 ## [2.6.43] - 2023-09-08
199 - Publish on GitHub packages registry on release.
203 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
205 ## [2.6.42] - 2023-09-06
209 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
211 ## [2.6.41] - 2023-09-03
215 - Optimize worker choice strategies implementation.
217 ## [2.6.40] - 2023-09-01
221 - Do not pre-choose in WRR worker choice strategy to avoid bias.
222 - Avoid array out of bound in worker choice strategies after worker node removal.
224 ## [2.6.39] - 2023-08-30
228 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
230 ## [2.6.38] - 2023-08-30
234 - Bundle typescript types declaration into one file.
238 - Improve interleaved weighted round robin worker choice strategy implementation.
240 ## [2.6.37] - 2023-08-28
244 - Ensure unused worker usage statistics are deleted at runtime.
248 - Rename worker choice strategy options `choiceRetries` to `retries`.
249 - Avoid unnecessary branching in worker choice strategies.
251 ## [2.6.36] - 2023-08-27
255 - Fix pool `execute()` arguments check.
259 - Make continuous tasks stealing algorithm less aggressive.
260 - Fine tune tasks stealing algorithm under back pressure.
262 ## [2.6.35] - 2023-08-25
266 - Don't account worker usage statistics for tasks that have failed.
267 - Fix pool information runtime and wait time median computation.
271 - Update simple moving average implementation to use a circular buffer.
272 - Update simple moving median implementation to use a circular buffer.
273 - Account for stolen tasks in worker usage statistics and pool information.
277 - Continuous tasks stealing algorithm.
279 ## [2.6.34] - 2023-08-24
283 - Avoid cascading tasks stealing under back pressure.
287 - Add fastpath to queued tasks rescheduling.
289 ## [2.6.33] - 2023-08-24
293 - Fix queued tasks rescheduling.
297 - Rename tasks queue options `queueMaxSize` to `size`.
301 - Task stealing scheduling algorithm if tasks queueing is enabled.
303 ## [2.6.32] - 2023-08-23
307 - Ensure no task can be executed when the pool is destroyed.
311 - Add `queueMaxSize` option to tasks queue options.
312 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
313 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
315 ## [2.6.31] - 2023-08-20
319 - Fix worker choice strategy retries mechanism in some edge cases.
323 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
324 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
326 ## [2.6.30] - 2023-08-19
330 - Ensure pool event `backPressure` is emitted.
331 - Ensure pool event `full` is emitted only once.
332 - Ensure worker node cannot be instantiated without proper arguments.
334 ## [2.6.29] - 2023-08-18
338 - Fix race condition between readiness and task functions worker message handling at startup.
339 - Fix duplicate task function worker usage statistics computation per task function.
340 - Update task function worker usage statistics if and only if there's at least two different task functions.
341 - Fix race condition at task function worker usage executing task computation leading to negative value.
345 - 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).
346 - Use back pressure detection in worker choice strategies.
347 - Add worker choice strategies retries mechanism if no worker is eligible.
349 ## [2.6.28] - 2023-08-16
353 - Ensure pool workers are properly initialized.
357 - HTTP server pool examples: express-cluster, express-hybrid.
361 - Remove now useless branching in worker hot code path.
363 ## [2.6.27] - 2023-08-15
367 - Add `KillHandler` type definition to exported types.
371 - Add `destroy` event to pool API.
373 ## [2.6.26] - 2023-08-15
377 - Add kill handler to worker options allowing to execute custom code when worker is killed.
378 - Add `listTaskFunctions()` method to pool API.
379 - SMTP client pool example: nodemailer.
381 ## [2.6.25] - 2023-08-13
385 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
386 - WebSocket server pool examples: ws-cluster, ws-hybrid.
388 ## [2.6.24] - 2023-08-12
392 - Add array of transferable objects to the `execute()` method arguments.
393 - WebSocket server pool examples: ws-worker_threads.
395 ## [2.6.23] - 2023-08-11
399 - 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.
403 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
404 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
406 ## [2.6.22] - 2023-08-10
410 - Add missing `types` field to package.json `exports`.
414 - Structure markdown documentation (PR #811).
416 ## [2.6.21] - 2023-08-03
420 - Improve code documentation.
421 - Code refactoring and cleanup for better maintainability and readability.
423 ## [2.6.20] - 2023-07-21
427 - Fix queued tasks redistribution on error task execution starvation.
428 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
432 - Drastically reduce lookups by worker in the worker nodes.
434 ## [2.6.19] - 2023-07-20
438 - Dedicated internal communication channel for worker_threads pools.
440 ## [2.6.18] - 2023-07-19
444 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
446 ## [2.6.17] - 2023-07-16
450 - Add `listTaskFunctions()` method to worker API.
452 ## [2.6.16] - 2023-07-12
456 - Fix pool startup detection.
457 - Fix worker task functions handling.
459 ## [2.6.15] - 2023-07-11
463 - Take into account worker node readiness in worker choice strategies.
465 ## [2.6.14] - 2023-07-10
469 - Fix task function statistics tracking.
471 ## [2.6.13] - 2023-07-10
475 - Add per task function statistics tracking.
476 - Add public methods to manipulate the worker task functions at runtime.
478 ## [2.6.12] - 2023-07-09
482 - Workaround import issue with `node:os` module in node 16.x.x.
484 ## [2.6.11] - 2023-07-09
488 - Fix pool readiness semantic.
490 ## [2.6.10] - 2023-07-08
494 - Ensure workers are not recreated on error at pool startup.
498 - Add `ready` and `strategy` fields to pool information.
499 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
500 - Add dynamic pool sizing checks.
502 ## [2.6.9] - 2023-07-07
506 - Recreate the right worker type on uncaught exception.
510 - Add minimum and maximum to internal measurement statistics.
511 - Add `runTime` and `waitTime` to pool information.
512 - Check worker inactive time only on dynamic worker.
514 ## [2.6.8] - 2023-07-03
518 - Brown paper bag release to fix version handling in pool information.
520 ## [2.6.7] - 2023-07-03
524 - Ensure worker queued tasks at error are reassigned to other pool workers.
528 - Add pool `utilization` ratio to pool information.
529 - Add `version` to pool information.
530 - Add worker information to worker nodes.
532 ## [2.6.6] - 2023-07-01
536 - Add safe helper `availableParallelism()` to help sizing the pool.
540 - Ensure message handler is only registered in worker.
542 ## [2.6.5] - 2023-06-27
546 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
550 - Artificial version bump to 2.6.5 to workaround publication issue.
551 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
552 - Ensure pool event is emitted before task error promise rejection.
553 - Fix queued tasks count computation.
557 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
559 ## [2.6.4] - 2023-06-27
563 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
567 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
568 - Ensure pool event is emitted before task error promise rejection.
569 - Fix queued tasks count computation.
573 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
575 ## [2.6.3] - 2023-06-19
579 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
580 - Update strategies internals after statistics computation.
584 - Optimize O(1) queue implementation.
586 ## [2.6.2] - 2023-06-12
590 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
592 ## [2.6.1] - 2023-06-10
596 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
600 - Fix average statistics computation: ensure failed tasks are not accounted.
602 ## [2.6.0] - 2023-06-09
606 - Add `LEAST_ELU` worker choice strategy (experimental).
607 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
611 - Refactor pool worker node usage internals.
612 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
613 - Breaking change: pool information `info` property object fields have been renamed.
617 - Fix wait time accounting.
618 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
619 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
621 ## [2.5.4] - 2023-06-07
625 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
629 - Compute statistics at the worker level only if needed.
630 - Add `worker_threads` options to thread pool options.
634 - Make the `LEAST_BUSY` strategy only relies on task runtime.
636 ## [2.5.3] - 2023-06-04
640 - Refine pool information content.
641 - Limit pool internals public exposure.
643 ## [2.5.2] - 2023-06-02
647 - Add `taskError` pool event for task execution error.
648 - Add pool information `info` property to pool.
649 - Emit pool information on `busy` and `full` pool events.
651 ## [2.5.1] - 2023-06-01
655 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
656 - Add `error` pool event for uncaught worker error.
658 ## [2.5.0] - 2023-05-31
662 - Switch pool event emitter to `EventEmitterAsyncResource`.
663 - Add tasks wait time accounting in per worker tasks usage.
664 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
668 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
670 ## [2.4.14] - 2023-05-09
674 - Ensure no undefined task runtime can land in the tasks history.
675 - Fix median computation implementation once again.
679 - Unit tests for median and queue implementations.
681 ## [2.4.13] - 2023-05-08
685 - Fix worker choice strategy options validation.
686 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
688 ## [2.4.12] - 2023-05-06
692 - Support multiple task functions per worker.
693 - Add custom worker weights support to worker choice strategies options.
697 - Use O(1) queue implementation for tasks queueing.
701 - Fix median computation implementation.
702 - Fix fair share worker choice strategy internals update.
704 ## [2.4.11] - 2023-04-23
708 - Optimize free worker finding in worker choice strategies.
710 ## [2.4.10] - 2023-04-15
714 - Fix typescript type definition for task function: ensure the input data is optional.
715 - Fix typescript type definition for pool execute(): ensure the input data is optional.
717 ## [2.4.9] - 2023-04-15
721 - Add tasks queue enablement runtime setter to pool.
722 - Add tasks queue options runtime setter to pool.
723 - Add worker choice strategy options runtime setter to pool.
727 - Remove the tasks queuing experimental status.
731 - Fix task function type definition and validation.
732 - Fix worker choice strategy options handling.
734 ## [2.4.8] - 2023-04-12
738 - Fix message between main worker and worker type definition for tasks.
739 - Fix code documentation.
741 ## [2.4.7] - 2023-04-11
745 - Add worker tasks queue options to pool options.
749 - Fix missing documentation.
751 ## [2.4.6] - 2023-04-10
755 - Ensure one task at a time is executed per worker with tasks queueing enabled.
756 - Properly count worker executing tasks with tasks queueing enabled.
758 ## [2.4.5] - 2023-04-09
762 - Use monotonic high resolution timer for worker tasks runtime.
763 - Add worker tasks median runtime to statistics.
764 - Add worker tasks queue (experimental).
766 ## [2.4.4] - 2023-04-07
770 - Add `PoolEvents` enumeration and `PoolEvent` type.
774 - Destroy worker only on alive check.
776 ## [2.4.3] - 2023-04-07
780 - Fix typedoc generation with inheritance.
782 ## [2.4.2] - 2023-04-06
786 - Add `full` event to dynamic pool.
787 - Keep worker choice strategy in memory for conditional reuse.
791 - Fix possible negative worker key at worker removal in worker choice strategies.
793 ## [2.4.1] - 2023-04-05
797 - Optimize worker choice strategy for dynamic pool.
801 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
803 ## [2.4.0] - 2023-04-04
807 - Add `LESS_BUSY` worker choice strategy.
811 - Optimize worker storage in pool.
812 - Optimize worker alive status check.
813 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
814 - Optimize `LESS_USED` worker choice strategy.
815 - Update benchmark versus external threads pools.
816 - Optimize tasks usage statistics requirements for worker choice strategy.
820 - Ensure trimmable characters are checked at pool initialization.
821 - Fix message id integer overflow.
822 - Fix pool worker removal in worker choice strategy internals.
823 - Fix package publication with pnpm.
825 ## [2.4.0-3] - 2023-04-04
829 - Add `LESS_BUSY` worker choice strategy.
833 - Optimize worker storage in pool.
834 - Optimize worker alive status check.
835 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
836 - Optimize `LESS_USED` worker choice strategy.
837 - Update benchmark versus external threads pools.
841 - Ensure trimmable characters are checked at pool initialization.
842 - Fix message id integer overflow.
843 - Fix pool worker removal in worker choice strategy internals.
844 - Fix package publication with pnpm.
846 ## [2.4.0-2] - 2023-04-03
850 - Add `LESS_BUSY` worker choice strategy.
854 - Optimize worker storage in pool.
855 - Optimize worker alive status check.
856 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
857 - Optimize `LESS_USED` worker choice strategy.
861 - Ensure trimmable characters are checked at pool initialization.
862 - Fix message id integer overflow.
863 - Fix pool worker removal in worker choice strategy internals.
864 - Fix package publication with pnpm.
866 ## [2.4.0-1] - 2023-04-03
870 - Add `LESS_BUSY` worker choice strategy.
874 - Optimize worker storage in pool.
875 - Optimize worker alive status check.
876 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
877 - Optimize `LESS_USED` worker choice strategy.
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.
885 ## [2.4.0-0] - 2023-04-03
889 - Add `LESS_BUSY` worker choice strategy.
893 - Optimize worker storage in pool.
894 - Optimize worker alive status check.
895 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
896 - Optimize `LESS_USED` worker choice strategy.
900 - Ensure trimmable characters are checked at pool initialization.
901 - Fix message id integer overflow.
902 - Fix pool worker removal in worker choice strategy internals.
904 ## [2.3.10] - 2023-03-18
908 - Fix package.json `exports` syntax for ESM and CommonJS.
912 - Permit SemVer pre-release publication.
914 ## [2.3.10-2] - 2023-03-18
918 - Fix package.json `exports` syntax for ESM and CommonJS.
920 ## [2.3.10-1] - 2023-03-18
924 - Permit SemVer pre-release publication.
926 ## [2.3.10-0] - 2023-03-18
930 - Fix package.json `exports` syntax for ESM and CommonJS.
932 ## [2.3.9] - 2023-03-18
936 - Introduce ESM module support along with CommonJS one.
940 - Fix brown paper bag bug referencing the same object literal.
942 ## [2.3.8] - 2023-03-18
946 - Switch internal benchmarking code to benny.
947 - Switch to TypeScript 5.x.x.
948 - Switch rollup bundler plugins to core ones.
949 - Switch to TSDoc syntax.
950 - Enforce conventional commits.
954 - Fix random integer generator.
955 - Fix worker choice strategy pool type identification at initialization.
957 ## [2.3.7] - 2022-10-23
961 - Switch to open collective FOSS project funding platform.
962 - Switch to ts-standard linter configuration on TypeScript code.
966 - Fixed missing async on pool execute method.
967 - Fixed typing in TypeScript example.
968 - Fixed types in unit tests.
970 ## [2.3.6] - 2022-10-22
974 - Cleanup pool attributes and methods.
975 - Refine error types thrown.
979 - Fix continuous integration build on windows.
980 - Fix code coverage reporting by using c8 instead of nyc.
982 ## [2.3.5] - 2022-10-21
986 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
987 - Optimize tasks usage lookup implementation.
991 - Fix missed pool event emitter type export.
992 - Fix typedoc documentation generation.
994 ## [2.3.4] - 2022-10-17
998 - Fully automate release process with release-it.
1002 - Optimize fair share task scheduling algorithm implementation.
1003 - Update benchmark versus external pools results with latest version.
1005 ## [2.3.3] - 2022-10-15
1009 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1011 ## [2.3.2] - 2022-10-14
1015 - Optimize fair share worker selection strategy implementation.
1019 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1021 ## [2.3.1] - 2022-10-13
1025 - Pool worker choice strategies:
1026 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1027 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1029 ## [2.2.2] - 2022-10-09
1033 - Fixed `README.md` file.
1035 ## [2.2.1] - 2022-10-08
1039 - Dynamic worker choice strategy change at runtime.
1041 ## [2.2.0] - 2022-01-05
1043 ### Breaking Changes
1045 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1047 ## [2.1.0] - 2021-08-29
1051 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1053 ### Breaking Changes
1055 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1056 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1057 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1058 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1060 ## [2.0.2] - 2021-05-12
1064 - Fix `busy` event emission on fixed pool type
1066 ## [2.0.1] - 2021-03-16
1070 - Check if pool options are properly set.
1071 - `busy` event is emitted on all pool types.
1073 ## [2.0.0] - 2021-03-01
1077 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1079 ### Breaking Changes
1081 - `FullPool` event is now renamed to `busy`.
1082 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1083 _Find more details on our JSDoc._
1085 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1087 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1089 ### Pool options types declaration merge
1091 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1093 #### New `export` strategy
1097 const DynamicThreadPool = require('poolifier/lib/dynamic')
1099 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1102 But you should always prefer just using
1105 const { DynamicThreadPool } = require('poolifier')
1108 #### New type definitions for input data and response
1110 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1111 _This is not a limitation by poolifier but Node.js._
1113 #### Public property replacements
1115 `numWorkers` property is now `numberOfWorkers`
1117 #### Internal (protected) properties and methods renaming
1119 These properties are not intended for end users
1121 - `id` => `nextMessageId`
1123 These methods are not intended for end users
1125 - `_chooseWorker` => `chooseWorker`
1126 - `_newWorker` => `createWorker`
1127 - `_execute` => `internalExecute`
1128 - `_chooseWorker` => `chooseWorker`
1129 - `_checkAlive` => `checkAlive`
1131 - `_runAsync` => `runAsync`
1133 ## [1.1.0] - 2020-05-21
1137 - ThreadWorker support async functions as option
1138 - Various external library patches
1140 ## [1.0.0] - 2020-01-24
1144 - FixedThreadPool implementation
1145 - DynamicThreadPool implementation
1146 - WorkerThread implementation to improve developer experience