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 ## [4.0.8] - 2024-05-15
14 - Fix default task function worker choice strategy and priority handling.
16 ## [4.0.7] - 2024-05-13
20 - Add ELU statistics to pool information.
22 ## [4.0.6] - 2024-05-10
26 - Fix pools' `addTaskFunction()` type definition.
28 ## [4.0.5] - 2024-05-09
32 - Avoid queued tasks redistribution on the errored worker node.
34 ## [4.0.4] - 2024-05-08
38 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
40 ## [4.0.3] - 2024-05-08
44 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
46 ## [4.0.2] - 2024-05-06
50 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
52 ## [4.0.1] - 2024-05-02
56 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
57 - Account for tasks wait time in task execution time computation in worker choice strategies to avoid biased decisions under load with several prioritized task functions and tasks queue enabled.
59 ## [4.0.0] - 2024-04-30
63 - Support per task function(s) priority and worker choice strategy definition via a task function object: `{ taskFunction: (data?: Data) => Response | Promise<Response>, priority?: number, strategy?: WorkerChoiceStrategy }`.
64 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
65 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
66 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
70 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
72 ## [3.1.30] - 2024-04-22
76 - Fix `transferList` argument type definition.
78 ## [3.1.29] - 2024-04-02
82 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
84 ## [3.1.28] - 2024-04-01
88 - Ensure the minimum number of workers on a started pool is guaranteed.
90 ## [3.1.27] - 2024-03-27
94 - Fix publishing on JSR, take 4.
96 ## [3.1.26] - 2024-03-27
100 - Fix publishing on JSR, take 3.
102 ## [3.1.25] - 2024-03-27
106 - Fix publishing on JSR, take 2.
108 ## [3.1.24] - 2024-03-27
112 - Fix publishing on JSR.
114 ## [3.1.23] - 2024-03-27
120 ## [3.1.22] - 2024-03-15
124 - Fix pool event emitter registered callbacks removal at `destroy()`.
126 ## [3.1.21] - 2024-02-22
130 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
132 ## [3.1.20] - 2024-02-11
136 - Ensure `worker_threads` workers are unreferenced at termination.
138 ## [3.1.19] - 2024-01-16
142 - Fix possible null exception at task finishing handling.
146 - Optimize Deque implementation to improve tasks queueing performance.
148 ## [3.1.18] - 2024-01-06
152 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
154 ## [3.1.17] - 2024-01-05
158 - Improve performance by clean up unneeded condition checks on hot code paths.
160 ## [3.1.16] - 2024-01-03
164 - Add missing type to TS type definitions.
166 ## [3.1.15] - 2024-01-02
170 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
172 ## [3.1.15-0] - 2024-01-02
176 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
178 ## [3.1.14] - 2024-01-01
182 - Properly handle dynamic pool with zero minimum size.
184 ## [3.1.13] - 2023-12-30
188 - Reduce branching in several hot code paths.
189 - Use faster object cloning implementation.
191 ## [3.1.12] - 2023-12-27
195 - Fix tasks redistribution triggers at pool destroying.
199 - Switch TypeScript module resolution to Node16.
201 ## [3.1.12-0] - 2023-12-27
205 - Fix tasks redistribution triggers at pool destroying.
207 ## [3.1.11] - 2023-12-24
211 - Avoid worker node cross tasks stealing.
212 - Ensure only half the pool worker nodes can steal tasks.
214 ## [3.1.10] - 2023-12-23
218 - Avoid useless branching on pool type.
220 ## [3.1.9] - 2023-12-22
224 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
226 ## [3.1.8] - 2023-12-21
230 - Fix default worker weight computation.
231 - Fix possible null exception at pool destroying.
233 ## [3.1.7] - 2023-12-20
237 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
239 ## [3.1.6] - 2023-12-18
243 - Fix pool destroying with tasks queuing enabled.
245 ## [3.1.5] - 2023-12-18
249 - Add queued tasks end timeout support to worker node termination.
251 ## [3.1.4] - 2023-12-18
255 - Make more robust the fix for possible null exception at handling task execution response.
257 ## [3.1.3] - 2023-12-17
261 - Fix possible null exception at handling task execution response.
263 ## [3.1.2] - 2023-12-17
267 - Wait for queued tasks to end at worker node termination.
269 ## [3.1.1] - 2023-12-16
273 - Fix pool options TS type definition.
275 ## [3.1.0] - 2023-12-16
279 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
281 ## [3.0.14] - 2023-12-13
285 - Fix possible null exception with worker_threads pools.
287 ## [3.0.13] - 2023-12-12
291 - Ensure worker choice strategy wait for worker nodes readiness.
295 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
297 ## [3.0.12] - 2023-12-12
301 - Add infinite retries support in worker choice strategy.
303 ## [3.0.11] - 2023-12-11
307 - Ensure pool asynchronous resource properly track tasks execution.
309 ## [3.0.10] - 2023-12-08
313 - Add a fastpath when tasks stealing or redistribution is impossible.
315 ## [3.0.9] - 2023-11-26
319 - Remove all pool events listener at pool destroying.
320 - Remove all worker node events listener at worker node destroying.
321 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
323 ## [3.0.8] - 2023-11-25
327 - Ensure continuous tasks stealing on idle start at worker node idling.
329 ## [3.0.7] - 2023-11-24
333 - Make continuous tasks stealing start at worker node idling.
335 ## [3.0.6] - 2023-11-24
339 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
340 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
342 ## [3.0.5] - 2023-10-27
346 - Ensure pool `ready` event can be emitted only once.
348 ## [3.0.4] - 2023-10-20
352 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
353 - Use builtin retry mechanism in worker choice strategies instead of custom one.
355 ## [3.0.3] - 2023-10-19
359 - Avoid null exception at sending message to worker.
360 - Avoid null exception at checking worker node readiness.
362 ## [3.0.2] - 2023-10-17
366 - 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).
368 ## [3.0.1] - 2023-10-16
372 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
376 - Switch the worker node eventing code to `EventTarget` API.
378 ## [3.0.0] - 2023-10-08
382 - Remove Node.js 16.x.x (EOL) support.
384 ## [2.7.5] - 2023-10-03
388 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
390 ## [2.7.4] - 2023-09-25
394 - Fix source maps (bundler issue).
396 ## [2.7.3] - 2023-09-24
400 - Convert pool event emitter to event emitter async resource.
402 ## [2.7.2] - 2023-09-23
406 - Add source maps to npm package to ease debugging.
410 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
412 ## [2.7.1] - 2023-09-20
416 - Ensure worker message listener used one time are removed after usage.
418 ## [2.7.0] - 2023-09-19
422 - Fix task stealing related tasks queue options handling at runtime.
426 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
430 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
431 - Stricter worker constructor arguments validation.
433 ## [2.6.45] - 2023-09-17
437 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
441 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
442 - Add `start()` method to pool API to start the minimum number of workers.
443 - Add `taskStealing` and `tasksStealingOnBackPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
444 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
446 ## [2.6.44] - 2023-09-08
450 - Use a dedicated PAT to publish on GitHub packages registry.
454 - Publish on GitHub packages registry on release.
458 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
460 ## [2.6.43] - 2023-09-08
464 - Publish on GitHub packages registry on release.
468 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
470 ## [2.6.42] - 2023-09-06
474 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
476 ## [2.6.41] - 2023-09-03
480 - Optimize worker choice strategies implementation.
482 ## [2.6.40] - 2023-09-01
486 - Do not pre-choose in WRR worker choice strategy to avoid bias.
487 - Avoid array out of bound in worker choice strategies after worker node removal.
489 ## [2.6.39] - 2023-08-30
493 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
495 ## [2.6.38] - 2023-08-30
499 - Bundle typescript types declaration into one file.
503 - Improve interleaved weighted round robin worker choice strategy implementation.
505 ## [2.6.37] - 2023-08-28
509 - Ensure unused worker usage statistics are deleted at runtime.
513 - Rename worker choice strategy options `choiceRetries` to `retries`.
514 - Avoid unnecessary branching in worker choice strategies.
516 ## [2.6.36] - 2023-08-27
520 - Fix pool `execute()` arguments check.
524 - Make continuous tasks stealing algorithm less aggressive.
525 - Fine tune tasks stealing algorithm under back pressure.
527 ## [2.6.35] - 2023-08-25
531 - Don't account worker usage statistics for tasks that have failed.
532 - Fix pool information runtime and wait time median computation.
536 - Update simple moving average implementation to use a circular buffer.
537 - Update simple moving median implementation to use a circular buffer.
538 - Account for stolen tasks in worker usage statistics and pool information.
542 - Continuous tasks stealing algorithm.
544 ## [2.6.34] - 2023-08-24
548 - Avoid cascading tasks stealing under back pressure.
552 - Add fastpath to queued tasks rescheduling.
554 ## [2.6.33] - 2023-08-24
558 - Fix queued tasks rescheduling.
562 - Rename tasks queue options `queueMaxSize` to `size`.
566 - Task stealing scheduling algorithm if tasks queueing is enabled.
568 ## [2.6.32] - 2023-08-23
572 - Ensure no task can be executed when the pool is destroyed.
576 - Add `queueMaxSize` option to tasks queue options.
577 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
578 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
580 ## [2.6.31] - 2023-08-20
584 - Fix worker choice strategy retries mechanism in some edge cases.
588 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
589 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
591 ## [2.6.30] - 2023-08-19
595 - Ensure pool event `backPressure` is emitted.
596 - Ensure pool event `full` is emitted only once.
597 - Ensure worker node cannot be instantiated without proper arguments.
599 ## [2.6.29] - 2023-08-18
603 - Fix race condition between readiness and task functions worker message handling at startup.
604 - Fix duplicate task function worker usage statistics computation per task function.
605 - Update task function worker usage statistics if and only if there's at least two different task functions.
606 - Fix race condition at task function worker usage executing task computation leading to negative value.
610 - 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).
611 - Use back pressure detection in worker choice strategies.
612 - Add worker choice strategies retries mechanism if no worker is eligible.
614 ## [2.6.28] - 2023-08-16
618 - Ensure pool workers are properly initialized.
622 - HTTP server pool examples: express-cluster, express-hybrid.
626 - Remove now useless branching in worker hot code path.
628 ## [2.6.27] - 2023-08-15
632 - Add `KillHandler` type definition to exported types.
636 - Add `destroy` event to pool API.
638 ## [2.6.26] - 2023-08-15
642 - Add kill handler to worker options allowing to execute custom code when worker is killed.
643 - Add `listTaskFunctions()` method to pool API.
644 - SMTP client pool example: nodemailer.
646 ## [2.6.25] - 2023-08-13
650 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
651 - WebSocket server pool examples: ws-cluster, ws-hybrid.
653 ## [2.6.24] - 2023-08-12
657 - Add array of transferable objects to the `execute()` method arguments.
658 - WebSocket server pool examples: ws-worker_threads.
660 ## [2.6.23] - 2023-08-11
664 - 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.
668 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
669 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
671 ## [2.6.22] - 2023-08-10
675 - Add missing `types` field to package.json `exports`.
679 - Structure markdown documentation (PR #811).
681 ## [2.6.21] - 2023-08-03
685 - Improve code documentation.
686 - Code refactoring and cleanup for better maintainability and readability.
688 ## [2.6.20] - 2023-07-21
692 - Fix queued tasks redistribution on error task execution starvation.
693 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
697 - Drastically reduce lookups by worker in the worker nodes.
699 ## [2.6.19] - 2023-07-20
703 - Dedicated internal communication channel for worker_threads pools.
705 ## [2.6.18] - 2023-07-19
709 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
711 ## [2.6.17] - 2023-07-16
715 - Add `listTaskFunctions()` method to worker API.
717 ## [2.6.16] - 2023-07-12
721 - Fix pool startup detection.
722 - Fix worker task functions handling.
724 ## [2.6.15] - 2023-07-11
728 - Take into account worker node readiness in worker choice strategies.
730 ## [2.6.14] - 2023-07-10
734 - Fix task function statistics tracking.
736 ## [2.6.13] - 2023-07-10
740 - Add per task function statistics tracking.
741 - Add public methods to manipulate the worker task functions at runtime.
743 ## [2.6.12] - 2023-07-09
747 - Workaround import issue with `node:os` module in node 16.x.x.
749 ## [2.6.11] - 2023-07-09
753 - Fix pool readiness semantic.
755 ## [2.6.10] - 2023-07-08
759 - Ensure workers are not recreated on error at pool startup.
763 - Add `ready` and `strategy` fields to pool information.
764 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
765 - Add dynamic pool sizing checks.
767 ## [2.6.9] - 2023-07-07
771 - Recreate the right worker type on uncaught exception.
775 - Add minimum and maximum to internal measurement statistics.
776 - Add `runTime` and `waitTime` to pool information.
777 - Check worker inactive time only on dynamic worker.
779 ## [2.6.8] - 2023-07-03
783 - Brown paper bag release to fix version handling in pool information.
785 ## [2.6.7] - 2023-07-03
789 - Ensure worker queued tasks at error are reassigned to other pool workers.
793 - Add pool `utilization` ratio to pool information.
794 - Add `version` to pool information.
795 - Add worker information to worker nodes.
797 ## [2.6.6] - 2023-07-01
801 - Add safe helper `availableParallelism()` to help sizing the pool.
805 - Ensure message handler is only registered in worker.
807 ## [2.6.5] - 2023-06-27
811 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
815 - Artificial version bump to 2.6.5 to workaround publication issue.
816 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
817 - Ensure pool event is emitted before task error promise rejection.
818 - Fix queued tasks count computation.
822 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
824 ## [2.6.4] - 2023-06-27
828 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
832 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
833 - Ensure pool event is emitted before task error promise rejection.
834 - Fix queued tasks count computation.
838 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
840 ## [2.6.3] - 2023-06-19
844 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
845 - Update strategies internals after statistics computation.
849 - Optimize O(1) queue implementation.
851 ## [2.6.2] - 2023-06-12
855 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
857 ## [2.6.1] - 2023-06-10
861 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
865 - Fix average statistics computation: ensure failed tasks are not accounted.
867 ## [2.6.0] - 2023-06-09
871 - Add `LEAST_ELU` worker choice strategy (experimental).
872 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
876 - Refactor pool worker node usage internals.
877 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
878 - Breaking change: pool information `info` property object fields have been renamed.
882 - Fix wait time accounting.
883 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
884 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
886 ## [2.5.4] - 2023-06-07
890 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
894 - Compute statistics at the worker level only if needed.
895 - Add `worker_threads` options to thread pool options.
899 - Make the `LEAST_BUSY` strategy only relies on task runtime.
901 ## [2.5.3] - 2023-06-04
905 - Refine pool information content.
906 - Limit pool internals public exposure.
908 ## [2.5.2] - 2023-06-02
912 - Add `taskError` pool event for task execution error.
913 - Add pool information `info` property to pool.
914 - Emit pool information on `busy` and `full` pool events.
916 ## [2.5.1] - 2023-06-01
920 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
921 - Add `error` pool event for uncaught worker error.
923 ## [2.5.0] - 2023-05-31
927 - Switch pool event emitter to `EventEmitterAsyncResource`.
928 - Add tasks wait time accounting in per worker tasks usage.
929 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
933 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
935 ## [2.4.14] - 2023-05-09
939 - Ensure no undefined task runtime can land in the tasks history.
940 - Fix median computation implementation once again.
944 - Unit tests for median and queue implementations.
946 ## [2.4.13] - 2023-05-08
950 - Fix worker choice strategy options validation.
951 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
953 ## [2.4.12] - 2023-05-06
957 - Support multiple task functions per worker.
958 - Add custom worker weights support to worker choice strategies options.
962 - Use O(1) queue implementation for tasks queueing.
966 - Fix median computation implementation.
967 - Fix fair share worker choice strategy internals update.
969 ## [2.4.11] - 2023-04-23
973 - Optimize free worker finding in worker choice strategies.
975 ## [2.4.10] - 2023-04-15
979 - Fix typescript type definition for task function: ensure the input data is optional.
980 - Fix typescript type definition for pool execute(): ensure the input data is optional.
982 ## [2.4.9] - 2023-04-15
986 - Add tasks queue enablement runtime setter to pool.
987 - Add tasks queue options runtime setter to pool.
988 - Add worker choice strategy options runtime setter to pool.
992 - Remove the tasks queuing experimental status.
996 - Fix task function type definition and validation.
997 - Fix worker choice strategy options handling.
999 ## [2.4.8] - 2023-04-12
1003 - Fix message between main worker and worker type definition for tasks.
1004 - Fix code documentation.
1006 ## [2.4.7] - 2023-04-11
1010 - Add worker tasks queue options to pool options.
1014 - Fix missing documentation.
1016 ## [2.4.6] - 2023-04-10
1020 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1021 - Properly count worker executing tasks with tasks queueing enabled.
1023 ## [2.4.5] - 2023-04-09
1027 - Use monotonic high resolution timer for worker tasks runtime.
1028 - Add worker tasks median runtime to statistics.
1029 - Add worker tasks queue (experimental).
1031 ## [2.4.4] - 2023-04-07
1035 - Add `PoolEvents` enumeration and `PoolEvent` type.
1039 - Destroy worker only on alive check.
1041 ## [2.4.3] - 2023-04-07
1045 - Fix typedoc generation with inheritance.
1047 ## [2.4.2] - 2023-04-06
1051 - Add `full` event to dynamic pool.
1052 - Keep worker choice strategy in memory for conditional reuse.
1056 - Fix possible negative worker key at worker removal in worker choice strategies.
1058 ## [2.4.1] - 2023-04-05
1062 - Optimize worker choice strategy for dynamic pool.
1066 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1068 ## [2.4.0] - 2023-04-04
1072 - Add `LESS_BUSY` worker choice strategy.
1076 - Optimize worker storage in pool.
1077 - Optimize worker alive status check.
1078 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1079 - Optimize `LESS_USED` worker choice strategy.
1080 - Update benchmark versus external threads pools.
1081 - Optimize tasks usage statistics requirements for worker choice strategy.
1085 - Ensure trimmable characters are checked at pool initialization.
1086 - Fix message id integer overflow.
1087 - Fix pool worker removal in worker choice strategy internals.
1088 - Fix package publication with pnpm.
1090 ## [2.4.0-3] - 2023-04-04
1094 - Add `LESS_BUSY` worker choice strategy.
1098 - Optimize worker storage in pool.
1099 - Optimize worker alive status check.
1100 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1101 - Optimize `LESS_USED` worker choice strategy.
1102 - Update benchmark versus external threads pools.
1106 - Ensure trimmable characters are checked at pool initialization.
1107 - Fix message id integer overflow.
1108 - Fix pool worker removal in worker choice strategy internals.
1109 - Fix package publication with pnpm.
1111 ## [2.4.0-2] - 2023-04-03
1115 - Add `LESS_BUSY` worker choice strategy.
1119 - Optimize worker storage in pool.
1120 - Optimize worker alive status check.
1121 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1122 - Optimize `LESS_USED` worker choice strategy.
1126 - Ensure trimmable characters are checked at pool initialization.
1127 - Fix message id integer overflow.
1128 - Fix pool worker removal in worker choice strategy internals.
1129 - Fix package publication with pnpm.
1131 ## [2.4.0-1] - 2023-04-03
1135 - Add `LESS_BUSY` worker choice strategy.
1139 - Optimize worker storage in pool.
1140 - Optimize worker alive status check.
1141 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1142 - Optimize `LESS_USED` worker choice strategy.
1146 - Ensure trimmable characters are checked at pool initialization.
1147 - Fix message id integer overflow.
1148 - Fix pool worker removal in worker choice strategy internals.
1150 ## [2.4.0-0] - 2023-04-03
1154 - Add `LESS_BUSY` worker choice strategy.
1158 - Optimize worker storage in pool.
1159 - Optimize worker alive status check.
1160 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1161 - Optimize `LESS_USED` worker choice strategy.
1165 - Ensure trimmable characters are checked at pool initialization.
1166 - Fix message id integer overflow.
1167 - Fix pool worker removal in worker choice strategy internals.
1169 ## [2.3.10] - 2023-03-18
1173 - Fix package.json `exports` syntax for ESM and CommonJS.
1177 - Permit SemVer pre-release publication.
1179 ## [2.3.10-2] - 2023-03-18
1183 - Fix package.json `exports` syntax for ESM and CommonJS.
1185 ## [2.3.10-1] - 2023-03-18
1189 - Permit SemVer pre-release publication.
1191 ## [2.3.10-0] - 2023-03-18
1195 - Fix package.json `exports` syntax for ESM and CommonJS.
1197 ## [2.3.9] - 2023-03-18
1201 - Introduce ESM module support along with CommonJS one.
1205 - Fix brown paper bag bug referencing the same object literal.
1207 ## [2.3.8] - 2023-03-18
1211 - Switch internal benchmarking code to benny.
1212 - Switch to TypeScript 5.x.x.
1213 - Switch rollup bundler plugins to core ones.
1214 - Switch to TSDoc syntax.
1215 - Enforce conventional commits.
1219 - Fix random integer generator.
1220 - Fix worker choice strategy pool type identification at initialization.
1222 ## [2.3.7] - 2022-10-23
1226 - Switch to open collective FOSS project funding platform.
1227 - Switch to ts-standard linter configuration on TypeScript code.
1231 - Fixed missing async on pool execute method.
1232 - Fixed typing in TypeScript example.
1233 - Fixed types in unit tests.
1235 ## [2.3.6] - 2022-10-22
1239 - Cleanup pool attributes and methods.
1240 - Refine error types thrown.
1244 - Fix continuous integration build on windows.
1245 - Fix code coverage reporting by using c8 instead of nyc.
1247 ## [2.3.5] - 2022-10-21
1251 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1252 - Optimize tasks usage lookup implementation.
1256 - Fix missed pool event emitter type export.
1257 - Fix typedoc documentation generation.
1259 ## [2.3.4] - 2022-10-17
1263 - Fully automate release process with release-it.
1267 - Optimize fair share task scheduling algorithm implementation.
1268 - Update benchmark versus external pools results with latest version.
1270 ## [2.3.3] - 2022-10-15
1274 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1276 ## [2.3.2] - 2022-10-14
1280 - Optimize fair share worker selection strategy implementation.
1284 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1286 ## [2.3.1] - 2022-10-13
1290 - Pool worker choice strategies:
1291 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1292 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1294 ## [2.2.2] - 2022-10-09
1298 - Fixed `README.md` file.
1300 ## [2.2.1] - 2022-10-08
1304 - Dynamic worker choice strategy change at runtime.
1306 ## [2.2.0] - 2022-01-05
1308 ### Breaking Changes
1310 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1312 ## [2.1.0] - 2021-08-29
1316 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1318 ### Breaking Changes
1320 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1321 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1322 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1323 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1325 ## [2.0.2] - 2021-05-12
1329 - Fix `busy` event emission on fixed pool type
1331 ## [2.0.1] - 2021-03-16
1335 - Check if pool options are properly set.
1336 - `busy` event is emitted on all pool types.
1338 ## [2.0.0] - 2021-03-01
1342 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1344 ### Breaking Changes
1346 - `FullPool` event is now renamed to `busy`.
1347 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1348 _Find more details on our JSDoc._
1350 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1352 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1354 ### Pool options types declaration merge
1356 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1358 #### New `export` strategy
1362 const DynamicThreadPool = require('poolifier/lib/dynamic')
1364 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1367 But you should always prefer just using
1370 const { DynamicThreadPool } = require('poolifier')
1373 #### New type definitions for input data and response
1375 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1376 _This is not a limitation by poolifier but Node.js._
1378 #### Public property replacements
1380 `numWorkers` property is now `numberOfWorkers`
1382 #### Internal (protected) properties and methods renaming
1384 These properties are not intended for end users
1386 - `id` => `nextMessageId`
1388 These methods are not intended for end users
1390 - `_chooseWorker` => `chooseWorker`
1391 - `_newWorker` => `createWorker`
1392 - `_execute` => `internalExecute`
1393 - `_chooseWorker` => `chooseWorker`
1394 - `_checkAlive` => `checkAlive`
1396 - `_runAsync` => `runAsync`
1398 ## [1.1.0] - 2020-05-21
1402 - ThreadWorker support async functions as option
1403 - Various external library patches
1405 ## [1.0.0] - 2020-01-24
1409 - FixedThreadPool implementation
1410 - DynamicThreadPool implementation
1411 - WorkerThread implementation to improve developer experience