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 poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
14 ## [4.0.1] - 2024-05-02
18 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
19 - 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.
21 ## [4.0.0] - 2024-04-30
25 - 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 }`.
26 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
27 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
28 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
32 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
34 ## [3.1.30] - 2024-04-22
38 - Fix `transferList` argument type definition.
40 ## [3.1.29] - 2024-04-02
44 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
46 ## [3.1.28] - 2024-04-01
50 - Ensure the minimum number of workers on a started pool is guaranteed.
52 ## [3.1.27] - 2024-03-27
56 - Fix publishing on JSR, take 4.
58 ## [3.1.26] - 2024-03-27
62 - Fix publishing on JSR, take 3.
64 ## [3.1.25] - 2024-03-27
68 - Fix publishing on JSR, take 2.
70 ## [3.1.24] - 2024-03-27
74 - Fix publishing on JSR.
76 ## [3.1.23] - 2024-03-27
82 ## [3.1.22] - 2024-03-15
86 - Fix pool event emitter registered callbacks removal at `destroy()`.
88 ## [3.1.21] - 2024-02-22
92 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
94 ## [3.1.20] - 2024-02-11
98 - Ensure `worker_threads` workers are unreferenced at termination.
100 ## [3.1.19] - 2024-01-16
104 - Fix possible null exception at task finishing handling.
108 - Optimize Deque implementation to improve tasks queueing performance.
110 ## [3.1.18] - 2024-01-06
114 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
116 ## [3.1.17] - 2024-01-05
120 - Improve performance by clean up unneeded condition checks on hot code paths.
122 ## [3.1.16] - 2024-01-03
126 - Add missing type to TS type definitions.
128 ## [3.1.15] - 2024-01-02
132 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
134 ## [3.1.15-0] - 2024-01-02
138 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
140 ## [3.1.14] - 2024-01-01
144 - Properly handle dynamic pool with zero minimum size.
146 ## [3.1.13] - 2023-12-30
150 - Reduce branching in several hot code paths.
151 - Use faster object cloning implementation.
153 ## [3.1.12] - 2023-12-27
157 - Fix tasks redistribution triggers at pool destroying.
161 - Switch TypeScript module resolution to Node16.
163 ## [3.1.12-0] - 2023-12-27
167 - Fix tasks redistribution triggers at pool destroying.
169 ## [3.1.11] - 2023-12-24
173 - Avoid worker node cross tasks stealing.
174 - Ensure only half the pool worker nodes can steal tasks.
176 ## [3.1.10] - 2023-12-23
180 - Avoid useless branching on pool type.
182 ## [3.1.9] - 2023-12-22
186 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
188 ## [3.1.8] - 2023-12-21
192 - Fix default worker weight computation.
193 - Fix possible null exception at pool destroying.
195 ## [3.1.7] - 2023-12-20
199 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
201 ## [3.1.6] - 2023-12-18
205 - Fix pool destroying with tasks queuing enabled.
207 ## [3.1.5] - 2023-12-18
211 - Add queued tasks end timeout support to worker node termination.
213 ## [3.1.4] - 2023-12-18
217 - Make more robust the fix for possible null exception at handling task execution response.
219 ## [3.1.3] - 2023-12-17
223 - Fix possible null exception at handling task execution response.
225 ## [3.1.2] - 2023-12-17
229 - Wait for queued tasks to end at worker node termination.
231 ## [3.1.1] - 2023-12-16
235 - Fix pool options TS type definition.
237 ## [3.1.0] - 2023-12-16
241 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
243 ## [3.0.14] - 2023-12-13
247 - Fix possible null exception with worker_threads pools.
249 ## [3.0.13] - 2023-12-12
253 - Ensure worker choice strategy wait for worker nodes readiness.
257 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
259 ## [3.0.12] - 2023-12-12
263 - Add infinite retries support in worker choice strategy.
265 ## [3.0.11] - 2023-12-11
269 - Ensure pool asynchronous resource properly track tasks execution.
271 ## [3.0.10] - 2023-12-08
275 - Add a fastpath when tasks stealing or redistribution is impossible.
277 ## [3.0.9] - 2023-11-26
281 - Remove all pool events listener at pool destroying.
282 - Remove all worker node events listener at worker node destroying.
283 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
285 ## [3.0.8] - 2023-11-25
289 - Ensure continuous tasks stealing on idle start at worker node idling.
291 ## [3.0.7] - 2023-11-24
295 - Make continuous tasks stealing start at worker node idling.
297 ## [3.0.6] - 2023-11-24
301 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
302 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
304 ## [3.0.5] - 2023-10-27
308 - Ensure pool `ready` event can be emitted only once.
310 ## [3.0.4] - 2023-10-20
314 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
315 - Use builtin retry mechanism in worker choice strategies instead of custom one.
317 ## [3.0.3] - 2023-10-19
321 - Avoid null exception at sending message to worker.
322 - Avoid null exception at checking worker node readiness.
324 ## [3.0.2] - 2023-10-17
328 - 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).
330 ## [3.0.1] - 2023-10-16
334 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
338 - Switch the worker node eventing code to `EventTarget` API.
340 ## [3.0.0] - 2023-10-08
344 - Remove Node.js 16.x.x (EOL) support.
346 ## [2.7.5] - 2023-10-03
350 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
352 ## [2.7.4] - 2023-09-25
356 - Fix source maps (bundler issue).
358 ## [2.7.3] - 2023-09-24
362 - Convert pool event emitter to event emitter async resource.
364 ## [2.7.2] - 2023-09-23
368 - Add source maps to npm package to ease debugging.
372 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
374 ## [2.7.1] - 2023-09-20
378 - Ensure worker message listener used one time are removed after usage.
380 ## [2.7.0] - 2023-09-19
384 - Fix task stealing related tasks queue options handling at runtime.
388 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
392 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
393 - Stricter worker constructor arguments validation.
395 ## [2.6.45] - 2023-09-17
399 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
403 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
404 - Add `start()` method to pool API to start the minimum number of workers.
405 - 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.
406 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
408 ## [2.6.44] - 2023-09-08
412 - Use a dedicated PAT to publish on GitHub packages registry.
416 - Publish on GitHub packages registry on release.
420 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
422 ## [2.6.43] - 2023-09-08
426 - Publish on GitHub packages registry on release.
430 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
432 ## [2.6.42] - 2023-09-06
436 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
438 ## [2.6.41] - 2023-09-03
442 - Optimize worker choice strategies implementation.
444 ## [2.6.40] - 2023-09-01
448 - Do not pre-choose in WRR worker choice strategy to avoid bias.
449 - Avoid array out of bound in worker choice strategies after worker node removal.
451 ## [2.6.39] - 2023-08-30
455 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
457 ## [2.6.38] - 2023-08-30
461 - Bundle typescript types declaration into one file.
465 - Improve interleaved weighted round robin worker choice strategy implementation.
467 ## [2.6.37] - 2023-08-28
471 - Ensure unused worker usage statistics are deleted at runtime.
475 - Rename worker choice strategy options `choiceRetries` to `retries`.
476 - Avoid unnecessary branching in worker choice strategies.
478 ## [2.6.36] - 2023-08-27
482 - Fix pool `execute()` arguments check.
486 - Make continuous tasks stealing algorithm less aggressive.
487 - Fine tune tasks stealing algorithm under back pressure.
489 ## [2.6.35] - 2023-08-25
493 - Don't account worker usage statistics for tasks that have failed.
494 - Fix pool information runtime and wait time median computation.
498 - Update simple moving average implementation to use a circular buffer.
499 - Update simple moving median implementation to use a circular buffer.
500 - Account for stolen tasks in worker usage statistics and pool information.
504 - Continuous tasks stealing algorithm.
506 ## [2.6.34] - 2023-08-24
510 - Avoid cascading tasks stealing under back pressure.
514 - Add fastpath to queued tasks rescheduling.
516 ## [2.6.33] - 2023-08-24
520 - Fix queued tasks rescheduling.
524 - Rename tasks queue options `queueMaxSize` to `size`.
528 - Task stealing scheduling algorithm if tasks queueing is enabled.
530 ## [2.6.32] - 2023-08-23
534 - Ensure no task can be executed when the pool is destroyed.
538 - Add `queueMaxSize` option to tasks queue options.
539 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
540 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
542 ## [2.6.31] - 2023-08-20
546 - Fix worker choice strategy retries mechanism in some edge cases.
550 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
551 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
553 ## [2.6.30] - 2023-08-19
557 - Ensure pool event `backPressure` is emitted.
558 - Ensure pool event `full` is emitted only once.
559 - Ensure worker node cannot be instantiated without proper arguments.
561 ## [2.6.29] - 2023-08-18
565 - Fix race condition between readiness and task functions worker message handling at startup.
566 - Fix duplicate task function worker usage statistics computation per task function.
567 - Update task function worker usage statistics if and only if there's at least two different task functions.
568 - Fix race condition at task function worker usage executing task computation leading to negative value.
572 - 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).
573 - Use back pressure detection in worker choice strategies.
574 - Add worker choice strategies retries mechanism if no worker is eligible.
576 ## [2.6.28] - 2023-08-16
580 - Ensure pool workers are properly initialized.
584 - HTTP server pool examples: express-cluster, express-hybrid.
588 - Remove now useless branching in worker hot code path.
590 ## [2.6.27] - 2023-08-15
594 - Add `KillHandler` type definition to exported types.
598 - Add `destroy` event to pool API.
600 ## [2.6.26] - 2023-08-15
604 - Add kill handler to worker options allowing to execute custom code when worker is killed.
605 - Add `listTaskFunctions()` method to pool API.
606 - SMTP client pool example: nodemailer.
608 ## [2.6.25] - 2023-08-13
612 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
613 - WebSocket server pool examples: ws-cluster, ws-hybrid.
615 ## [2.6.24] - 2023-08-12
619 - Add array of transferable objects to the `execute()` method arguments.
620 - WebSocket server pool examples: ws-worker_threads.
622 ## [2.6.23] - 2023-08-11
626 - 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.
630 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
631 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
633 ## [2.6.22] - 2023-08-10
637 - Add missing `types` field to package.json `exports`.
641 - Structure markdown documentation (PR #811).
643 ## [2.6.21] - 2023-08-03
647 - Improve code documentation.
648 - Code refactoring and cleanup for better maintainability and readability.
650 ## [2.6.20] - 2023-07-21
654 - Fix queued tasks redistribution on error task execution starvation.
655 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
659 - Drastically reduce lookups by worker in the worker nodes.
661 ## [2.6.19] - 2023-07-20
665 - Dedicated internal communication channel for worker_threads pools.
667 ## [2.6.18] - 2023-07-19
671 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
673 ## [2.6.17] - 2023-07-16
677 - Add `listTaskFunctions()` method to worker API.
679 ## [2.6.16] - 2023-07-12
683 - Fix pool startup detection.
684 - Fix worker task functions handling.
686 ## [2.6.15] - 2023-07-11
690 - Take into account worker node readiness in worker choice strategies.
692 ## [2.6.14] - 2023-07-10
696 - Fix task function statistics tracking.
698 ## [2.6.13] - 2023-07-10
702 - Add per task function statistics tracking.
703 - Add public methods to manipulate the worker task functions at runtime.
705 ## [2.6.12] - 2023-07-09
709 - Workaround import issue with `node:os` module in node 16.x.x.
711 ## [2.6.11] - 2023-07-09
715 - Fix pool readiness semantic.
717 ## [2.6.10] - 2023-07-08
721 - Ensure workers are not recreated on error at pool startup.
725 - Add `ready` and `strategy` fields to pool information.
726 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
727 - Add dynamic pool sizing checks.
729 ## [2.6.9] - 2023-07-07
733 - Recreate the right worker type on uncaught exception.
737 - Add minimum and maximum to internal measurement statistics.
738 - Add `runTime` and `waitTime` to pool information.
739 - Check worker inactive time only on dynamic worker.
741 ## [2.6.8] - 2023-07-03
745 - Brown paper bag release to fix version handling in pool information.
747 ## [2.6.7] - 2023-07-03
751 - Ensure worker queued tasks at error are reassigned to other pool workers.
755 - Add pool `utilization` ratio to pool information.
756 - Add `version` to pool information.
757 - Add worker information to worker nodes.
759 ## [2.6.6] - 2023-07-01
763 - Add safe helper `availableParallelism()` to help sizing the pool.
767 - Ensure message handler is only registered in worker.
769 ## [2.6.5] - 2023-06-27
773 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
777 - Artificial version bump to 2.6.5 to workaround publication issue.
778 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
779 - Ensure pool event is emitted before task error promise rejection.
780 - Fix queued tasks count computation.
784 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
786 ## [2.6.4] - 2023-06-27
790 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
794 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
795 - Ensure pool event is emitted before task error promise rejection.
796 - Fix queued tasks count computation.
800 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
802 ## [2.6.3] - 2023-06-19
806 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
807 - Update strategies internals after statistics computation.
811 - Optimize O(1) queue implementation.
813 ## [2.6.2] - 2023-06-12
817 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
819 ## [2.6.1] - 2023-06-10
823 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
827 - Fix average statistics computation: ensure failed tasks are not accounted.
829 ## [2.6.0] - 2023-06-09
833 - Add `LEAST_ELU` worker choice strategy (experimental).
834 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
838 - Refactor pool worker node usage internals.
839 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
840 - Breaking change: pool information `info` property object fields have been renamed.
844 - Fix wait time accounting.
845 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
846 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
848 ## [2.5.4] - 2023-06-07
852 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
856 - Compute statistics at the worker level only if needed.
857 - Add `worker_threads` options to thread pool options.
861 - Make the `LEAST_BUSY` strategy only relies on task runtime.
863 ## [2.5.3] - 2023-06-04
867 - Refine pool information content.
868 - Limit pool internals public exposure.
870 ## [2.5.2] - 2023-06-02
874 - Add `taskError` pool event for task execution error.
875 - Add pool information `info` property to pool.
876 - Emit pool information on `busy` and `full` pool events.
878 ## [2.5.1] - 2023-06-01
882 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
883 - Add `error` pool event for uncaught worker error.
885 ## [2.5.0] - 2023-05-31
889 - Switch pool event emitter to `EventEmitterAsyncResource`.
890 - Add tasks wait time accounting in per worker tasks usage.
891 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
895 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
897 ## [2.4.14] - 2023-05-09
901 - Ensure no undefined task runtime can land in the tasks history.
902 - Fix median computation implementation once again.
906 - Unit tests for median and queue implementations.
908 ## [2.4.13] - 2023-05-08
912 - Fix worker choice strategy options validation.
913 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
915 ## [2.4.12] - 2023-05-06
919 - Support multiple task functions per worker.
920 - Add custom worker weights support to worker choice strategies options.
924 - Use O(1) queue implementation for tasks queueing.
928 - Fix median computation implementation.
929 - Fix fair share worker choice strategy internals update.
931 ## [2.4.11] - 2023-04-23
935 - Optimize free worker finding in worker choice strategies.
937 ## [2.4.10] - 2023-04-15
941 - Fix typescript type definition for task function: ensure the input data is optional.
942 - Fix typescript type definition for pool execute(): ensure the input data is optional.
944 ## [2.4.9] - 2023-04-15
948 - Add tasks queue enablement runtime setter to pool.
949 - Add tasks queue options runtime setter to pool.
950 - Add worker choice strategy options runtime setter to pool.
954 - Remove the tasks queuing experimental status.
958 - Fix task function type definition and validation.
959 - Fix worker choice strategy options handling.
961 ## [2.4.8] - 2023-04-12
965 - Fix message between main worker and worker type definition for tasks.
966 - Fix code documentation.
968 ## [2.4.7] - 2023-04-11
972 - Add worker tasks queue options to pool options.
976 - Fix missing documentation.
978 ## [2.4.6] - 2023-04-10
982 - Ensure one task at a time is executed per worker with tasks queueing enabled.
983 - Properly count worker executing tasks with tasks queueing enabled.
985 ## [2.4.5] - 2023-04-09
989 - Use monotonic high resolution timer for worker tasks runtime.
990 - Add worker tasks median runtime to statistics.
991 - Add worker tasks queue (experimental).
993 ## [2.4.4] - 2023-04-07
997 - Add `PoolEvents` enumeration and `PoolEvent` type.
1001 - Destroy worker only on alive check.
1003 ## [2.4.3] - 2023-04-07
1007 - Fix typedoc generation with inheritance.
1009 ## [2.4.2] - 2023-04-06
1013 - Add `full` event to dynamic pool.
1014 - Keep worker choice strategy in memory for conditional reuse.
1018 - Fix possible negative worker key at worker removal in worker choice strategies.
1020 ## [2.4.1] - 2023-04-05
1024 - Optimize worker choice strategy for dynamic pool.
1028 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1030 ## [2.4.0] - 2023-04-04
1034 - Add `LESS_BUSY` worker choice strategy.
1038 - Optimize worker storage in pool.
1039 - Optimize worker alive status check.
1040 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1041 - Optimize `LESS_USED` worker choice strategy.
1042 - Update benchmark versus external threads pools.
1043 - Optimize tasks usage statistics requirements for worker choice strategy.
1047 - Ensure trimmable characters are checked at pool initialization.
1048 - Fix message id integer overflow.
1049 - Fix pool worker removal in worker choice strategy internals.
1050 - Fix package publication with pnpm.
1052 ## [2.4.0-3] - 2023-04-04
1056 - Add `LESS_BUSY` worker choice strategy.
1060 - Optimize worker storage in pool.
1061 - Optimize worker alive status check.
1062 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1063 - Optimize `LESS_USED` worker choice strategy.
1064 - Update benchmark versus external threads pools.
1068 - Ensure trimmable characters are checked at pool initialization.
1069 - Fix message id integer overflow.
1070 - Fix pool worker removal in worker choice strategy internals.
1071 - Fix package publication with pnpm.
1073 ## [2.4.0-2] - 2023-04-03
1077 - Add `LESS_BUSY` worker choice strategy.
1081 - Optimize worker storage in pool.
1082 - Optimize worker alive status check.
1083 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1084 - Optimize `LESS_USED` worker choice strategy.
1088 - Ensure trimmable characters are checked at pool initialization.
1089 - Fix message id integer overflow.
1090 - Fix pool worker removal in worker choice strategy internals.
1091 - Fix package publication with pnpm.
1093 ## [2.4.0-1] - 2023-04-03
1097 - Add `LESS_BUSY` worker choice strategy.
1101 - Optimize worker storage in pool.
1102 - Optimize worker alive status check.
1103 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1104 - Optimize `LESS_USED` worker choice strategy.
1108 - Ensure trimmable characters are checked at pool initialization.
1109 - Fix message id integer overflow.
1110 - Fix pool worker removal in worker choice strategy internals.
1112 ## [2.4.0-0] - 2023-04-03
1116 - Add `LESS_BUSY` worker choice strategy.
1120 - Optimize worker storage in pool.
1121 - Optimize worker alive status check.
1122 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1123 - Optimize `LESS_USED` worker choice strategy.
1127 - Ensure trimmable characters are checked at pool initialization.
1128 - Fix message id integer overflow.
1129 - Fix pool worker removal in worker choice strategy internals.
1131 ## [2.3.10] - 2023-03-18
1135 - Fix package.json `exports` syntax for ESM and CommonJS.
1139 - Permit SemVer pre-release publication.
1141 ## [2.3.10-2] - 2023-03-18
1145 - Fix package.json `exports` syntax for ESM and CommonJS.
1147 ## [2.3.10-1] - 2023-03-18
1151 - Permit SemVer pre-release publication.
1153 ## [2.3.10-0] - 2023-03-18
1157 - Fix package.json `exports` syntax for ESM and CommonJS.
1159 ## [2.3.9] - 2023-03-18
1163 - Introduce ESM module support along with CommonJS one.
1167 - Fix brown paper bag bug referencing the same object literal.
1169 ## [2.3.8] - 2023-03-18
1173 - Switch internal benchmarking code to benny.
1174 - Switch to TypeScript 5.x.x.
1175 - Switch rollup bundler plugins to core ones.
1176 - Switch to TSDoc syntax.
1177 - Enforce conventional commits.
1181 - Fix random integer generator.
1182 - Fix worker choice strategy pool type identification at initialization.
1184 ## [2.3.7] - 2022-10-23
1188 - Switch to open collective FOSS project funding platform.
1189 - Switch to ts-standard linter configuration on TypeScript code.
1193 - Fixed missing async on pool execute method.
1194 - Fixed typing in TypeScript example.
1195 - Fixed types in unit tests.
1197 ## [2.3.6] - 2022-10-22
1201 - Cleanup pool attributes and methods.
1202 - Refine error types thrown.
1206 - Fix continuous integration build on windows.
1207 - Fix code coverage reporting by using c8 instead of nyc.
1209 ## [2.3.5] - 2022-10-21
1213 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1214 - Optimize tasks usage lookup implementation.
1218 - Fix missed pool event emitter type export.
1219 - Fix typedoc documentation generation.
1221 ## [2.3.4] - 2022-10-17
1225 - Fully automate release process with release-it.
1229 - Optimize fair share task scheduling algorithm implementation.
1230 - Update benchmark versus external pools results with latest version.
1232 ## [2.3.3] - 2022-10-15
1236 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1238 ## [2.3.2] - 2022-10-14
1242 - Optimize fair share worker selection strategy implementation.
1246 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1248 ## [2.3.1] - 2022-10-13
1252 - Pool worker choice strategies:
1253 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1254 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1256 ## [2.2.2] - 2022-10-09
1260 - Fixed `README.md` file.
1262 ## [2.2.1] - 2022-10-08
1266 - Dynamic worker choice strategy change at runtime.
1268 ## [2.2.0] - 2022-01-05
1270 ### Breaking Changes
1272 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1274 ## [2.1.0] - 2021-08-29
1278 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1280 ### Breaking Changes
1282 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1283 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1284 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1285 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1287 ## [2.0.2] - 2021-05-12
1291 - Fix `busy` event emission on fixed pool type
1293 ## [2.0.1] - 2021-03-16
1297 - Check if pool options are properly set.
1298 - `busy` event is emitted on all pool types.
1300 ## [2.0.0] - 2021-03-01
1304 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1306 ### Breaking Changes
1308 - `FullPool` event is now renamed to `busy`.
1309 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1310 _Find more details on our JSDoc._
1312 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1314 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1316 ### Pool options types declaration merge
1318 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1320 #### New `export` strategy
1324 const DynamicThreadPool = require('poolifier/lib/dynamic')
1326 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1329 But you should always prefer just using
1332 const { DynamicThreadPool } = require('poolifier')
1335 #### New type definitions for input data and response
1337 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1338 _This is not a limitation by poolifier but Node.js._
1340 #### Public property replacements
1342 `numWorkers` property is now `numberOfWorkers`
1344 #### Internal (protected) properties and methods renaming
1346 These properties are not intended for end users
1348 - `id` => `nextMessageId`
1350 These methods are not intended for end users
1352 - `_chooseWorker` => `chooseWorker`
1353 - `_newWorker` => `createWorker`
1354 - `_execute` => `internalExecute`
1355 - `_chooseWorker` => `chooseWorker`
1356 - `_checkAlive` => `checkAlive`
1358 - `_runAsync` => `runAsync`
1360 ## [1.1.0] - 2020-05-21
1364 - ThreadWorker support async functions as option
1365 - Various external library patches
1367 ## [1.0.0] - 2020-01-24
1371 - FixedThreadPool implementation
1372 - DynamicThreadPool implementation
1373 - WorkerThread implementation to improve developer experience