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 ## [3.0.1] - 2023-10-16
14 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
18 - Switch the worker node eventing code to `EventTarget` API .
20 ## [3.0.0] - 2023-10-08
24 - Remove Node.js 16.x.x (EOL) support.
26 ## [2.7.5] - 2023-10-03
30 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
32 ## [2.7.4] - 2023-09-25
36 - Fix source maps (bundler issue).
38 ## [2.7.3] - 2023-09-24
42 - Convert pool event emitter to event emitter async resource.
44 ## [2.7.2] - 2023-09-23
48 - Add source maps to npm package to ease debugging.
52 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
54 ## [2.7.1] - 2023-09-20
58 - Ensure worker message listener used one time are removed after usage.
60 ## [2.7.0] - 2023-09-19
64 - Fix task stealing related tasks queue options handling at runtime.
68 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
72 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
73 - Stricter worker constructor arguments validation.
75 ## [2.6.45] - 2023-09-17
79 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
83 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
84 - Add `start()` method to pool API to start the minimum number of workers.
85 - 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.
86 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
88 ## [2.6.44] - 2023-09-08
92 - Use a dedicated PAT to publish on GitHub packages registry.
96 - Publish on GitHub packages registry on release.
100 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
102 ## [2.6.43] - 2023-09-08
106 - Publish on GitHub packages registry on release.
110 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
112 ## [2.6.42] - 2023-09-06
116 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
118 ## [2.6.41] - 2023-09-03
122 - Optimize worker choice strategies implementation.
124 ## [2.6.40] - 2023-09-01
128 - Do not pre-choose in WRR worker choice strategy to avoid bias.
129 - Avoid array out of bound in worker choice strategies after worker node removal.
131 ## [2.6.39] - 2023-08-30
135 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
137 ## [2.6.38] - 2023-08-30
141 - Bundle typescript types declaration into one file.
145 - Improve interleaved weighted round robin worker choice strategy implementation.
147 ## [2.6.37] - 2023-08-28
151 - Ensure unused worker usage statistics are deleted at runtime.
155 - Rename worker choice strategy options `choiceRetries` to `retries`.
156 - Avoid unnecessary branching in worker choice strategies.
158 ## [2.6.36] - 2023-08-27
162 - Fix pool `execute()` arguments check.
166 - Make continuous tasks stealing algorithm less aggressive.
167 - Fine tune tasks stealing algorithm under back pressure.
169 ## [2.6.35] - 2023-08-25
173 - Don't account worker usage statistics for tasks that have failed.
174 - Fix pool information runtime and wait time median computation.
178 - Update simple moving average implementation to use a circular buffer.
179 - Update simple moving median implementation to use a circular buffer.
180 - Account for stolen tasks in worker usage statistics and pool information.
184 - Continuous tasks stealing algorithm.
186 ## [2.6.34] - 2023-08-24
190 - Avoid cascading tasks stealing under back pressure.
194 - Add fastpath to queued tasks rescheduling.
196 ## [2.6.33] - 2023-08-24
200 - Fix queued tasks rescheduling.
204 - Rename tasks queue options `queueMaxSize` to `size`.
208 - Task stealing scheduling algorithm if tasks queueing is enabled.
210 ## [2.6.32] - 2023-08-23
214 - Ensure no task can be executed when the pool is destroyed.
218 - Add `queueMaxSize` option to tasks queue options.
219 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
220 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
222 ## [2.6.31] - 2023-08-20
226 - Fix worker choice strategy retries mechanism in some edge cases.
230 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
231 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
233 ## [2.6.30] - 2023-08-19
237 - Ensure pool event `backPressure` is emitted.
238 - Ensure pool event `full` is emitted only once.
239 - Ensure worker node cannot be instantiated without proper arguments.
241 ## [2.6.29] - 2023-08-18
245 - Fix race condition between ready and task functions worker message handling at startup.
246 - Fix duplicate task function worker usage statistics computation per task function.
247 - Update task function worker usage statistics if and only if there's at least two different task functions.
248 - Fix race condition at task function worker usage executing task computation leading to negative value.
252 - 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).
253 - Use back pressure detection in worker choice strategies.
254 - Add worker choice strategies retries mechanism if no worker is eligible.
256 ## [2.6.28] - 2023-08-16
260 - Ensure pool workers are properly initialized.
264 - HTTP server pool examples: express-cluster, express-hybrid.
268 - Remove now useless branching in worker hot code path.
270 ## [2.6.27] - 2023-08-15
274 - Add `KillHandler` type definition to exported types.
278 - Add `destroy` event to pool API.
280 ## [2.6.26] - 2023-08-15
284 - Add kill handler to worker options allowing to execute custom code when worker is killed.
285 - Add `listTaskFunctions()` method to pool API.
286 - SMTP client pool example: nodemailer.
288 ## [2.6.25] - 2023-08-13
292 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
293 - WebSocket server pool examples: ws-cluster, ws-hybrid.
295 ## [2.6.24] - 2023-08-12
299 - Add array of transferable objects to the `execute()` method arguments.
300 - WebSocket server pool examples: ws-worker_threads.
302 ## [2.6.23] - 2023-08-11
306 - 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.
310 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
311 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
313 ## [2.6.22] - 2023-08-10
317 - Add missing `types` field to package.json `exports`.
321 - Structure markdown documentation (PR #811).
323 ## [2.6.21] - 2023-08-03
327 - Improve code documentation.
328 - Code refactoring and cleanup for better maintainability and readability.
330 ## [2.6.20] - 2023-07-21
334 - Fix queued tasks redistribution on error task execution starvation.
335 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
339 - Drastically reduce lookups by worker in the worker nodes.
341 ## [2.6.19] - 2023-07-20
345 - Dedicated internal communication channel for worker_threads pools.
347 ## [2.6.18] - 2023-07-19
351 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
353 ## [2.6.17] - 2023-07-16
357 - Add `listTaskFunctions()` method to worker API.
359 ## [2.6.16] - 2023-07-12
363 - Fix pool startup detection.
364 - Fix worker task functions handling.
366 ## [2.6.15] - 2023-07-11
370 - Take into account worker node readiness in worker choice strategies.
372 ## [2.6.14] - 2023-07-10
376 - Fix task function statistics tracking.
378 ## [2.6.13] - 2023-07-10
382 - Add per task function statistics tracking.
383 - Add public methods to manipulate the worker task functions at runtime.
385 ## [2.6.12] - 2023-07-09
389 - Workaround import issue with `node:os` module in node 16.x.x.
391 ## [2.6.11] - 2023-07-09
395 - Fix pool readiness semantic.
397 ## [2.6.10] - 2023-07-08
401 - Ensure workers are not recreated on error at pool startup.
405 - Add `ready` and `strategy` fields to pool information.
406 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
407 - Add dynamic pool sizing checks.
409 ## [2.6.9] - 2023-07-07
413 - Recreate the right worker type on uncaught exception.
417 - Add minimum and maximum to internal measurement statistics.
418 - Add `runTime` and `waitTime` to pool information.
419 - Check worker inactive time only on dynamic worker.
421 ## [2.6.8] - 2023-07-03
425 - Brown paper bag release to fix version handling in pool information.
427 ## [2.6.7] - 2023-07-03
431 - Ensure worker queued tasks at error are reassigned to other pool workers.
435 - Add pool `utilization` ratio to pool information.
436 - Add `version` to pool information.
437 - Add worker information to worker nodes.
439 ## [2.6.6] - 2023-07-01
443 - Add safe helper `availableParallelism()` to help sizing the pool.
447 - Ensure message handler is only registered in worker.
449 ## [2.6.5] - 2023-06-27
453 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
457 - Artificial version bump to 2.6.5 to workaround publication issue.
458 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
459 - Ensure pool event is emitted before task error promise rejection.
460 - Fix queued tasks count computation.
464 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
466 ## [2.6.4] - 2023-06-27
470 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
474 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
475 - Ensure pool event is emitted before task error promise rejection.
476 - Fix queued tasks count computation.
480 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
482 ## [2.6.3] - 2023-06-19
486 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
487 - Update strategies internals after statistics computation.
491 - Optimize O(1) queue implementation.
493 ## [2.6.2] - 2023-06-12
497 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
499 ## [2.6.1] - 2023-06-10
503 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
507 - Fix average statistics computation: ensure failed tasks are not accounted.
509 ## [2.6.0] - 2023-06-09
513 - Add `LEAST_ELU` worker choice strategy (experimental).
514 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
518 - Refactor pool worker node usage internals.
519 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
520 - Breaking change: pool information `info` property object fields have been renamed.
524 - Fix wait time accounting.
525 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
526 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
528 ## [2.5.4] - 2023-06-07
532 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
536 - Compute statistics at the worker level only if needed.
537 - Add `worker_threads` options to thread pool options.
541 - Make the `LEAST_BUSY` strategy only relies on task runtime.
543 ## [2.5.3] - 2023-06-04
547 - Refine pool information content.
548 - Limit pool internals public exposure.
550 ## [2.5.2] - 2023-06-02
554 - Add `taskError` pool event for task execution error.
555 - Add pool information `info` property to pool.
556 - Emit pool information on `busy` and `full` pool events.
558 ## [2.5.1] - 2023-06-01
562 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
563 - Add `error` pool event for uncaught worker error.
565 ## [2.5.0] - 2023-05-31
569 - Switch pool event emitter to `EventEmitterAsyncResource`.
570 - Add tasks wait time accounting in per worker tasks usage.
571 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
575 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
577 ## [2.4.14] - 2023-05-09
581 - Ensure no undefined task runtime can land in the tasks history.
582 - Fix median computation implementation once again.
586 - Unit tests for median and queue implementations.
588 ## [2.4.13] - 2023-05-08
592 - Fix worker choice strategy options validation.
593 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
595 ## [2.4.12] - 2023-05-06
599 - Support multiple task functions per worker.
600 - Add custom worker weights support to worker choice strategies options.
604 - Use O(1) queue implementation for tasks queueing.
608 - Fix median computation implementation.
609 - Fix fair share worker choice strategy internals update.
611 ## [2.4.11] - 2023-04-23
615 - Optimize free worker finding in worker choice strategies.
617 ## [2.4.10] - 2023-04-15
621 - Fix typescript type definition for task function: ensure the input data is optional.
622 - Fix typescript type definition for pool execute(): ensure the input data is optional.
624 ## [2.4.9] - 2023-04-15
628 - Add tasks queue enablement runtime setter to pool.
629 - Add tasks queue options runtime setter to pool.
630 - Add worker choice strategy options runtime setter to pool.
634 - Remove the tasks queuing experimental status.
638 - Fix task function type definition and validation.
639 - Fix worker choice strategy options handling.
641 ## [2.4.8] - 2023-04-12
645 - Fix message between main worker and worker type definition for tasks.
646 - Fix code documentation.
648 ## [2.4.7] - 2023-04-11
652 - Add worker tasks queue options to pool options.
656 - Fix missing documentation.
658 ## [2.4.6] - 2023-04-10
662 - Ensure one task at a time is executed per worker with tasks queueing enabled.
663 - Properly count worker executing tasks with tasks queueing enabled.
665 ## [2.4.5] - 2023-04-09
669 - Use monotonic high resolution timer for worker tasks runtime.
670 - Add worker tasks median runtime to statistics.
671 - Add worker tasks queue (experimental).
673 ## [2.4.4] - 2023-04-07
677 - Add `PoolEvents` enumeration and `PoolEvent` type.
681 - Destroy worker only on alive check.
683 ## [2.4.3] - 2023-04-07
687 - Fix typedoc generation with inheritance.
689 ## [2.4.2] - 2023-04-06
693 - Add `full` event to dynamic pool.
694 - Keep worker choice strategy in memory for conditional reuse.
698 - Fix possible negative worker key at worker removal in worker choice strategies.
700 ## [2.4.1] - 2023-04-05
704 - Optimize worker choice strategy for dynamic pool.
708 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
710 ## [2.4.0] - 2023-04-04
714 - Add `LESS_BUSY` worker choice strategy.
718 - Optimize worker storage in pool.
719 - Optimize worker alive status check.
720 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
721 - Optimize `LESS_USED` worker choice strategy.
722 - Update benchmark versus external threads pools.
723 - Optimize tasks usage statistics requirements for worker choice strategy.
727 - Ensure trimmable characters are checked at pool initialization.
728 - Fix message id integer overflow.
729 - Fix pool worker removal in worker choice strategy internals.
730 - Fix package publication with pnpm.
732 ## [2.4.0-3] - 2023-04-04
736 - Add `LESS_BUSY` worker choice strategy.
740 - Optimize worker storage in pool.
741 - Optimize worker alive status check.
742 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
743 - Optimize `LESS_USED` worker choice strategy.
744 - Update benchmark versus external threads pools.
748 - Ensure trimmable characters are checked at pool initialization.
749 - Fix message id integer overflow.
750 - Fix pool worker removal in worker choice strategy internals.
751 - Fix package publication with pnpm.
753 ## [2.4.0-2] - 2023-04-03
757 - Add `LESS_BUSY` worker choice strategy.
761 - Optimize worker storage in pool.
762 - Optimize worker alive status check.
763 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
764 - Optimize `LESS_USED` worker choice strategy.
768 - Ensure trimmable characters are checked at pool initialization.
769 - Fix message id integer overflow.
770 - Fix pool worker removal in worker choice strategy internals.
771 - Fix package publication with pnpm.
773 ## [2.4.0-1] - 2023-04-03
777 - Add `LESS_BUSY` worker choice strategy.
781 - Optimize worker storage in pool.
782 - Optimize worker alive status check.
783 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
784 - Optimize `LESS_USED` worker choice strategy.
788 - Ensure trimmable characters are checked at pool initialization.
789 - Fix message id integer overflow.
790 - Fix pool worker removal in worker choice strategy internals.
792 ## [2.4.0-0] - 2023-04-03
796 - Add `LESS_BUSY` worker choice strategy.
800 - Optimize worker storage in pool.
801 - Optimize worker alive status check.
802 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
803 - Optimize `LESS_USED` worker choice strategy.
807 - Ensure trimmable characters are checked at pool initialization.
808 - Fix message id integer overflow.
809 - Fix pool worker removal in worker choice strategy internals.
811 ## [2.3.10] - 2023-03-18
815 - Fix package.json `exports` syntax for ESM and CommonJS.
819 - Permit SemVer pre-release publication.
821 ## [2.3.10-2] - 2023-03-18
825 - Fix package.json `exports` syntax for ESM and CommonJS.
827 ## [2.3.10-1] - 2023-03-18
831 - Permit SemVer pre-release publication.
833 ## [2.3.10-0] - 2023-03-18
837 - Fix package.json `exports` syntax for ESM and CommonJS.
839 ## [2.3.9] - 2023-03-18
843 - Introduce ESM module support along with CommonJS one.
847 - Fix brown paper bag bug referencing the same object literal.
849 ## [2.3.8] - 2023-03-18
853 - Switch internal benchmarking code to benny.
854 - Switch to TypeScript 5.x.x.
855 - Switch rollup bundler plugins to core ones.
856 - Switch to TSDoc syntax.
857 - Enforce conventional commits.
861 - Fix random integer generator.
862 - Fix worker choice strategy pool type identification at initialization.
864 ## [2.3.7] - 2022-10-23
868 - Switch to open collective FOSS project funding platform.
869 - Switch to ts-standard linter configuration on TypeScript code.
873 - Fixed missing async on pool execute method.
874 - Fixed typing in TypeScript example.
875 - Fixed types in unit tests.
877 ## [2.3.6] - 2022-10-22
881 - Cleanup pool attributes and methods.
882 - Refine error types thrown.
886 - Fix continuous integration build on windows.
887 - Fix code coverage reporting by using c8 instead of nyc.
889 ## [2.3.5] - 2022-10-21
893 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
894 - Optimize tasks usage lookup implementation.
898 - Fix missed pool event emitter type export.
899 - Fix typedoc documentation generation.
901 ## [2.3.4] - 2022-10-17
905 - Fully automate release process with release-it.
909 - Optimize fair share task scheduling algorithm implementation.
910 - Update benchmark versus external pools results with latest version.
912 ## [2.3.3] - 2022-10-15
916 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
918 ## [2.3.2] - 2022-10-14
922 - Optimize fair share worker selection strategy implementation.
926 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
928 ## [2.3.1] - 2022-10-13
932 - Pool worker choice strategies:
933 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
934 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
936 ## [2.2.2] - 2022-10-09
940 - Fixed `README.md` file.
942 ## [2.2.1] - 2022-10-08
946 - Dynamic worker choice strategy change at runtime.
948 ## [2.2.0] - 2022-01-05
952 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
954 ## [2.1.0] - 2021-08-29
958 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
962 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
963 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
964 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
965 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
967 ## [2.0.2] - 2021-05-12
971 - Fix `busy` event emission on fixed pool type
973 ## [2.0.1] - 2021-03-16
977 - Check if pool options are properly set.
978 - `busy` event is emitted on all pool types.
980 ## [2.0.0] - 2021-03-01
984 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
988 - `FullPool` event is now renamed to `busy`.
989 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
990 _Find more details on our JSDoc._
992 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
994 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
996 ### Pool options types declaration merge
998 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1000 #### New `export` strategy
1004 const DynamicThreadPool = require('poolifier/lib/dynamic')
1006 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1009 But you should always prefer just using
1012 const { DynamicThreadPool } = require('poolifier')
1015 #### New type definitions for input data and response
1017 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1018 _This is not a limitation by poolifier but Node.js._
1020 #### Public property replacements
1022 `numWorkers` property is now `numberOfWorkers`
1024 #### Internal (protected) properties and methods renaming
1026 These properties are not intended for end users
1028 - `id` => `nextMessageId`
1030 These methods are not intended for end users
1032 - `_chooseWorker` => `chooseWorker`
1033 - `_newWorker` => `createWorker`
1034 - `_execute` => `internalExecute`
1035 - `_chooseWorker` => `chooseWorker`
1036 - `_checkAlive` => `checkAlive`
1038 - `_runAsync` => `runAsync`
1040 ## [1.1.0] - 2020-05-21
1044 - ThreadWorker support async functions as option
1045 - Various external library patches
1047 ## [1.0.0] - 2020-01-24
1051 - FixedThreadPool implementation
1052 - DynamicThreadPool implementation
1053 - WorkerThread implementation to improve developer experience