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 ## [4.0.1] - 2024-05-02
14 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
15 - 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.
17 ## [4.0.0] - 2024-04-30
21 - 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 }`.
22 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
23 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
24 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
28 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
30 ## [3.1.30] - 2024-04-22
34 - Fix `transferList` argument type definition.
36 ## [3.1.29] - 2024-04-02
40 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
42 ## [3.1.28] - 2024-04-01
46 - Ensure the minimum number of workers on a started pool is guaranteed.
48 ## [3.1.27] - 2024-03-27
52 - Fix publishing on JSR, take 4.
54 ## [3.1.26] - 2024-03-27
58 - Fix publishing on JSR, take 3.
60 ## [3.1.25] - 2024-03-27
64 - Fix publishing on JSR, take 2.
66 ## [3.1.24] - 2024-03-27
70 - Fix publishing on JSR.
72 ## [3.1.23] - 2024-03-27
78 ## [3.1.22] - 2024-03-15
82 - Fix pool event emitter registered callbacks removal at `destroy()`.
84 ## [3.1.21] - 2024-02-22
88 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
90 ## [3.1.20] - 2024-02-11
94 - Ensure `worker_threads` workers are unreferenced at termination.
96 ## [3.1.19] - 2024-01-16
100 - Fix possible null exception at task finishing handling.
104 - Optimize Deque implementation to improve tasks queueing performance.
106 ## [3.1.18] - 2024-01-06
110 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
112 ## [3.1.17] - 2024-01-05
116 - Improve performance by clean up unneeded condition checks on hot code paths.
118 ## [3.1.16] - 2024-01-03
122 - Add missing type to TS type definitions.
124 ## [3.1.15] - 2024-01-02
128 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
130 ## [3.1.15-0] - 2024-01-02
134 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
136 ## [3.1.14] - 2024-01-01
140 - Properly handle dynamic pool with zero minimum size.
142 ## [3.1.13] - 2023-12-30
146 - Reduce branching in several hot code paths.
147 - Use faster object cloning implementation.
149 ## [3.1.12] - 2023-12-27
153 - Fix tasks redistribution triggers at pool destroying.
157 - Switch TypeScript module resolution to Node16.
159 ## [3.1.12-0] - 2023-12-27
163 - Fix tasks redistribution triggers at pool destroying.
165 ## [3.1.11] - 2023-12-24
169 - Avoid worker node cross tasks stealing.
170 - Ensure only half the pool worker nodes can steal tasks.
172 ## [3.1.10] - 2023-12-23
176 - Avoid useless branching on pool type.
178 ## [3.1.9] - 2023-12-22
182 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
184 ## [3.1.8] - 2023-12-21
188 - Fix default worker weight computation.
189 - Fix possible null exception at pool destroying.
191 ## [3.1.7] - 2023-12-20
195 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
197 ## [3.1.6] - 2023-12-18
201 - Fix pool destroying with tasks queuing enabled.
203 ## [3.1.5] - 2023-12-18
207 - Add queued tasks end timeout support to worker node termination.
209 ## [3.1.4] - 2023-12-18
213 - Make more robust the fix for possible null exception at handling task execution response.
215 ## [3.1.3] - 2023-12-17
219 - Fix possible null exception at handling task execution response.
221 ## [3.1.2] - 2023-12-17
225 - Wait for queued tasks to end at worker node termination.
227 ## [3.1.1] - 2023-12-16
231 - Fix pool options TS type definition.
233 ## [3.1.0] - 2023-12-16
237 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
239 ## [3.0.14] - 2023-12-13
243 - Fix possible null exception with worker_threads pools.
245 ## [3.0.13] - 2023-12-12
249 - Ensure worker choice strategy wait for worker nodes readiness.
253 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
255 ## [3.0.12] - 2023-12-12
259 - Add infinite retries support in worker choice strategy.
261 ## [3.0.11] - 2023-12-11
265 - Ensure pool asynchronous resource properly track tasks execution.
267 ## [3.0.10] - 2023-12-08
271 - Add a fastpath when tasks stealing or redistribution is impossible.
273 ## [3.0.9] - 2023-11-26
277 - Remove all pool events listener at pool destroying.
278 - Remove all worker node events listener at worker node destroying.
279 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
281 ## [3.0.8] - 2023-11-25
285 - Ensure continuous tasks stealing on idle start at worker node idling.
287 ## [3.0.7] - 2023-11-24
291 - Make continuous tasks stealing start at worker node idling.
293 ## [3.0.6] - 2023-11-24
297 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
298 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
300 ## [3.0.5] - 2023-10-27
304 - Ensure pool `ready` event can be emitted only once.
306 ## [3.0.4] - 2023-10-20
310 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
311 - Use builtin retry mechanism in worker choice strategies instead of custom one.
313 ## [3.0.3] - 2023-10-19
317 - Avoid null exception at sending message to worker.
318 - Avoid null exception at checking worker node readiness.
320 ## [3.0.2] - 2023-10-17
324 - 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).
326 ## [3.0.1] - 2023-10-16
330 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
334 - Switch the worker node eventing code to `EventTarget` API.
336 ## [3.0.0] - 2023-10-08
340 - Remove Node.js 16.x.x (EOL) support.
342 ## [2.7.5] - 2023-10-03
346 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
348 ## [2.7.4] - 2023-09-25
352 - Fix source maps (bundler issue).
354 ## [2.7.3] - 2023-09-24
358 - Convert pool event emitter to event emitter async resource.
360 ## [2.7.2] - 2023-09-23
364 - Add source maps to npm package to ease debugging.
368 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
370 ## [2.7.1] - 2023-09-20
374 - Ensure worker message listener used one time are removed after usage.
376 ## [2.7.0] - 2023-09-19
380 - Fix task stealing related tasks queue options handling at runtime.
384 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
388 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
389 - Stricter worker constructor arguments validation.
391 ## [2.6.45] - 2023-09-17
395 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
399 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
400 - Add `start()` method to pool API to start the minimum number of workers.
401 - 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.
402 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
404 ## [2.6.44] - 2023-09-08
408 - Use a dedicated PAT to publish on GitHub packages registry.
412 - Publish on GitHub packages registry on release.
416 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
418 ## [2.6.43] - 2023-09-08
422 - Publish on GitHub packages registry on release.
426 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
428 ## [2.6.42] - 2023-09-06
432 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
434 ## [2.6.41] - 2023-09-03
438 - Optimize worker choice strategies implementation.
440 ## [2.6.40] - 2023-09-01
444 - Do not pre-choose in WRR worker choice strategy to avoid bias.
445 - Avoid array out of bound in worker choice strategies after worker node removal.
447 ## [2.6.39] - 2023-08-30
451 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
453 ## [2.6.38] - 2023-08-30
457 - Bundle typescript types declaration into one file.
461 - Improve interleaved weighted round robin worker choice strategy implementation.
463 ## [2.6.37] - 2023-08-28
467 - Ensure unused worker usage statistics are deleted at runtime.
471 - Rename worker choice strategy options `choiceRetries` to `retries`.
472 - Avoid unnecessary branching in worker choice strategies.
474 ## [2.6.36] - 2023-08-27
478 - Fix pool `execute()` arguments check.
482 - Make continuous tasks stealing algorithm less aggressive.
483 - Fine tune tasks stealing algorithm under back pressure.
485 ## [2.6.35] - 2023-08-25
489 - Don't account worker usage statistics for tasks that have failed.
490 - Fix pool information runtime and wait time median computation.
494 - Update simple moving average implementation to use a circular buffer.
495 - Update simple moving median implementation to use a circular buffer.
496 - Account for stolen tasks in worker usage statistics and pool information.
500 - Continuous tasks stealing algorithm.
502 ## [2.6.34] - 2023-08-24
506 - Avoid cascading tasks stealing under back pressure.
510 - Add fastpath to queued tasks rescheduling.
512 ## [2.6.33] - 2023-08-24
516 - Fix queued tasks rescheduling.
520 - Rename tasks queue options `queueMaxSize` to `size`.
524 - Task stealing scheduling algorithm if tasks queueing is enabled.
526 ## [2.6.32] - 2023-08-23
530 - Ensure no task can be executed when the pool is destroyed.
534 - Add `queueMaxSize` option to tasks queue options.
535 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
536 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
538 ## [2.6.31] - 2023-08-20
542 - Fix worker choice strategy retries mechanism in some edge cases.
546 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
547 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
549 ## [2.6.30] - 2023-08-19
553 - Ensure pool event `backPressure` is emitted.
554 - Ensure pool event `full` is emitted only once.
555 - Ensure worker node cannot be instantiated without proper arguments.
557 ## [2.6.29] - 2023-08-18
561 - Fix race condition between readiness and task functions worker message handling at startup.
562 - Fix duplicate task function worker usage statistics computation per task function.
563 - Update task function worker usage statistics if and only if there's at least two different task functions.
564 - Fix race condition at task function worker usage executing task computation leading to negative value.
568 - 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).
569 - Use back pressure detection in worker choice strategies.
570 - Add worker choice strategies retries mechanism if no worker is eligible.
572 ## [2.6.28] - 2023-08-16
576 - Ensure pool workers are properly initialized.
580 - HTTP server pool examples: express-cluster, express-hybrid.
584 - Remove now useless branching in worker hot code path.
586 ## [2.6.27] - 2023-08-15
590 - Add `KillHandler` type definition to exported types.
594 - Add `destroy` event to pool API.
596 ## [2.6.26] - 2023-08-15
600 - Add kill handler to worker options allowing to execute custom code when worker is killed.
601 - Add `listTaskFunctions()` method to pool API.
602 - SMTP client pool example: nodemailer.
604 ## [2.6.25] - 2023-08-13
608 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
609 - WebSocket server pool examples: ws-cluster, ws-hybrid.
611 ## [2.6.24] - 2023-08-12
615 - Add array of transferable objects to the `execute()` method arguments.
616 - WebSocket server pool examples: ws-worker_threads.
618 ## [2.6.23] - 2023-08-11
622 - 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.
626 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
627 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
629 ## [2.6.22] - 2023-08-10
633 - Add missing `types` field to package.json `exports`.
637 - Structure markdown documentation (PR #811).
639 ## [2.6.21] - 2023-08-03
643 - Improve code documentation.
644 - Code refactoring and cleanup for better maintainability and readability.
646 ## [2.6.20] - 2023-07-21
650 - Fix queued tasks redistribution on error task execution starvation.
651 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
655 - Drastically reduce lookups by worker in the worker nodes.
657 ## [2.6.19] - 2023-07-20
661 - Dedicated internal communication channel for worker_threads pools.
663 ## [2.6.18] - 2023-07-19
667 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
669 ## [2.6.17] - 2023-07-16
673 - Add `listTaskFunctions()` method to worker API.
675 ## [2.6.16] - 2023-07-12
679 - Fix pool startup detection.
680 - Fix worker task functions handling.
682 ## [2.6.15] - 2023-07-11
686 - Take into account worker node readiness in worker choice strategies.
688 ## [2.6.14] - 2023-07-10
692 - Fix task function statistics tracking.
694 ## [2.6.13] - 2023-07-10
698 - Add per task function statistics tracking.
699 - Add public methods to manipulate the worker task functions at runtime.
701 ## [2.6.12] - 2023-07-09
705 - Workaround import issue with `node:os` module in node 16.x.x.
707 ## [2.6.11] - 2023-07-09
711 - Fix pool readiness semantic.
713 ## [2.6.10] - 2023-07-08
717 - Ensure workers are not recreated on error at pool startup.
721 - Add `ready` and `strategy` fields to pool information.
722 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
723 - Add dynamic pool sizing checks.
725 ## [2.6.9] - 2023-07-07
729 - Recreate the right worker type on uncaught exception.
733 - Add minimum and maximum to internal measurement statistics.
734 - Add `runTime` and `waitTime` to pool information.
735 - Check worker inactive time only on dynamic worker.
737 ## [2.6.8] - 2023-07-03
741 - Brown paper bag release to fix version handling in pool information.
743 ## [2.6.7] - 2023-07-03
747 - Ensure worker queued tasks at error are reassigned to other pool workers.
751 - Add pool `utilization` ratio to pool information.
752 - Add `version` to pool information.
753 - Add worker information to worker nodes.
755 ## [2.6.6] - 2023-07-01
759 - Add safe helper `availableParallelism()` to help sizing the pool.
763 - Ensure message handler is only registered in worker.
765 ## [2.6.5] - 2023-06-27
769 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
773 - Artificial version bump to 2.6.5 to workaround publication issue.
774 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
775 - Ensure pool event is emitted before task error promise rejection.
776 - Fix queued tasks count computation.
780 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
782 ## [2.6.4] - 2023-06-27
786 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
790 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
791 - Ensure pool event is emitted before task error promise rejection.
792 - Fix queued tasks count computation.
796 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
798 ## [2.6.3] - 2023-06-19
802 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
803 - Update strategies internals after statistics computation.
807 - Optimize O(1) queue implementation.
809 ## [2.6.2] - 2023-06-12
813 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
815 ## [2.6.1] - 2023-06-10
819 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
823 - Fix average statistics computation: ensure failed tasks are not accounted.
825 ## [2.6.0] - 2023-06-09
829 - Add `LEAST_ELU` worker choice strategy (experimental).
830 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
834 - Refactor pool worker node usage internals.
835 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
836 - Breaking change: pool information `info` property object fields have been renamed.
840 - Fix wait time accounting.
841 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
842 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
844 ## [2.5.4] - 2023-06-07
848 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
852 - Compute statistics at the worker level only if needed.
853 - Add `worker_threads` options to thread pool options.
857 - Make the `LEAST_BUSY` strategy only relies on task runtime.
859 ## [2.5.3] - 2023-06-04
863 - Refine pool information content.
864 - Limit pool internals public exposure.
866 ## [2.5.2] - 2023-06-02
870 - Add `taskError` pool event for task execution error.
871 - Add pool information `info` property to pool.
872 - Emit pool information on `busy` and `full` pool events.
874 ## [2.5.1] - 2023-06-01
878 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
879 - Add `error` pool event for uncaught worker error.
881 ## [2.5.0] - 2023-05-31
885 - Switch pool event emitter to `EventEmitterAsyncResource`.
886 - Add tasks wait time accounting in per worker tasks usage.
887 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
891 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
893 ## [2.4.14] - 2023-05-09
897 - Ensure no undefined task runtime can land in the tasks history.
898 - Fix median computation implementation once again.
902 - Unit tests for median and queue implementations.
904 ## [2.4.13] - 2023-05-08
908 - Fix worker choice strategy options validation.
909 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
911 ## [2.4.12] - 2023-05-06
915 - Support multiple task functions per worker.
916 - Add custom worker weights support to worker choice strategies options.
920 - Use O(1) queue implementation for tasks queueing.
924 - Fix median computation implementation.
925 - Fix fair share worker choice strategy internals update.
927 ## [2.4.11] - 2023-04-23
931 - Optimize free worker finding in worker choice strategies.
933 ## [2.4.10] - 2023-04-15
937 - Fix typescript type definition for task function: ensure the input data is optional.
938 - Fix typescript type definition for pool execute(): ensure the input data is optional.
940 ## [2.4.9] - 2023-04-15
944 - Add tasks queue enablement runtime setter to pool.
945 - Add tasks queue options runtime setter to pool.
946 - Add worker choice strategy options runtime setter to pool.
950 - Remove the tasks queuing experimental status.
954 - Fix task function type definition and validation.
955 - Fix worker choice strategy options handling.
957 ## [2.4.8] - 2023-04-12
961 - Fix message between main worker and worker type definition for tasks.
962 - Fix code documentation.
964 ## [2.4.7] - 2023-04-11
968 - Add worker tasks queue options to pool options.
972 - Fix missing documentation.
974 ## [2.4.6] - 2023-04-10
978 - Ensure one task at a time is executed per worker with tasks queueing enabled.
979 - Properly count worker executing tasks with tasks queueing enabled.
981 ## [2.4.5] - 2023-04-09
985 - Use monotonic high resolution timer for worker tasks runtime.
986 - Add worker tasks median runtime to statistics.
987 - Add worker tasks queue (experimental).
989 ## [2.4.4] - 2023-04-07
993 - Add `PoolEvents` enumeration and `PoolEvent` type.
997 - Destroy worker only on alive check.
999 ## [2.4.3] - 2023-04-07
1003 - Fix typedoc generation with inheritance.
1005 ## [2.4.2] - 2023-04-06
1009 - Add `full` event to dynamic pool.
1010 - Keep worker choice strategy in memory for conditional reuse.
1014 - Fix possible negative worker key at worker removal in worker choice strategies.
1016 ## [2.4.1] - 2023-04-05
1020 - Optimize worker choice strategy for dynamic pool.
1024 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1026 ## [2.4.0] - 2023-04-04
1030 - Add `LESS_BUSY` worker choice strategy.
1034 - Optimize worker storage in pool.
1035 - Optimize worker alive status check.
1036 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1037 - Optimize `LESS_USED` worker choice strategy.
1038 - Update benchmark versus external threads pools.
1039 - Optimize tasks usage statistics requirements for worker choice strategy.
1043 - Ensure trimmable characters are checked at pool initialization.
1044 - Fix message id integer overflow.
1045 - Fix pool worker removal in worker choice strategy internals.
1046 - Fix package publication with pnpm.
1048 ## [2.4.0-3] - 2023-04-04
1052 - Add `LESS_BUSY` worker choice strategy.
1056 - Optimize worker storage in pool.
1057 - Optimize worker alive status check.
1058 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1059 - Optimize `LESS_USED` worker choice strategy.
1060 - Update benchmark versus external threads pools.
1064 - Ensure trimmable characters are checked at pool initialization.
1065 - Fix message id integer overflow.
1066 - Fix pool worker removal in worker choice strategy internals.
1067 - Fix package publication with pnpm.
1069 ## [2.4.0-2] - 2023-04-03
1073 - Add `LESS_BUSY` worker choice strategy.
1077 - Optimize worker storage in pool.
1078 - Optimize worker alive status check.
1079 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1080 - Optimize `LESS_USED` worker choice strategy.
1084 - Ensure trimmable characters are checked at pool initialization.
1085 - Fix message id integer overflow.
1086 - Fix pool worker removal in worker choice strategy internals.
1087 - Fix package publication with pnpm.
1089 ## [2.4.0-1] - 2023-04-03
1093 - Add `LESS_BUSY` worker choice strategy.
1097 - Optimize worker storage in pool.
1098 - Optimize worker alive status check.
1099 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1100 - Optimize `LESS_USED` worker choice strategy.
1104 - Ensure trimmable characters are checked at pool initialization.
1105 - Fix message id integer overflow.
1106 - Fix pool worker removal in worker choice strategy internals.
1108 ## [2.4.0-0] - 2023-04-03
1112 - Add `LESS_BUSY` worker choice strategy.
1116 - Optimize worker storage in pool.
1117 - Optimize worker alive status check.
1118 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1119 - Optimize `LESS_USED` worker choice strategy.
1123 - Ensure trimmable characters are checked at pool initialization.
1124 - Fix message id integer overflow.
1125 - Fix pool worker removal in worker choice strategy internals.
1127 ## [2.3.10] - 2023-03-18
1131 - Fix package.json `exports` syntax for ESM and CommonJS.
1135 - Permit SemVer pre-release publication.
1137 ## [2.3.10-2] - 2023-03-18
1141 - Fix package.json `exports` syntax for ESM and CommonJS.
1143 ## [2.3.10-1] - 2023-03-18
1147 - Permit SemVer pre-release publication.
1149 ## [2.3.10-0] - 2023-03-18
1153 - Fix package.json `exports` syntax for ESM and CommonJS.
1155 ## [2.3.9] - 2023-03-18
1159 - Introduce ESM module support along with CommonJS one.
1163 - Fix brown paper bag bug referencing the same object literal.
1165 ## [2.3.8] - 2023-03-18
1169 - Switch internal benchmarking code to benny.
1170 - Switch to TypeScript 5.x.x.
1171 - Switch rollup bundler plugins to core ones.
1172 - Switch to TSDoc syntax.
1173 - Enforce conventional commits.
1177 - Fix random integer generator.
1178 - Fix worker choice strategy pool type identification at initialization.
1180 ## [2.3.7] - 2022-10-23
1184 - Switch to open collective FOSS project funding platform.
1185 - Switch to ts-standard linter configuration on TypeScript code.
1189 - Fixed missing async on pool execute method.
1190 - Fixed typing in TypeScript example.
1191 - Fixed types in unit tests.
1193 ## [2.3.6] - 2022-10-22
1197 - Cleanup pool attributes and methods.
1198 - Refine error types thrown.
1202 - Fix continuous integration build on windows.
1203 - Fix code coverage reporting by using c8 instead of nyc.
1205 ## [2.3.5] - 2022-10-21
1209 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1210 - Optimize tasks usage lookup implementation.
1214 - Fix missed pool event emitter type export.
1215 - Fix typedoc documentation generation.
1217 ## [2.3.4] - 2022-10-17
1221 - Fully automate release process with release-it.
1225 - Optimize fair share task scheduling algorithm implementation.
1226 - Update benchmark versus external pools results with latest version.
1228 ## [2.3.3] - 2022-10-15
1232 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1234 ## [2.3.2] - 2022-10-14
1238 - Optimize fair share worker selection strategy implementation.
1242 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1244 ## [2.3.1] - 2022-10-13
1248 - Pool worker choice strategies:
1249 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1250 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1252 ## [2.2.2] - 2022-10-09
1256 - Fixed `README.md` file.
1258 ## [2.2.1] - 2022-10-08
1262 - Dynamic worker choice strategy change at runtime.
1264 ## [2.2.0] - 2022-01-05
1266 ### Breaking Changes
1268 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1270 ## [2.1.0] - 2021-08-29
1274 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1276 ### Breaking Changes
1278 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1279 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1280 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1281 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1283 ## [2.0.2] - 2021-05-12
1287 - Fix `busy` event emission on fixed pool type
1289 ## [2.0.1] - 2021-03-16
1293 - Check if pool options are properly set.
1294 - `busy` event is emitted on all pool types.
1296 ## [2.0.0] - 2021-03-01
1300 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1302 ### Breaking Changes
1304 - `FullPool` event is now renamed to `busy`.
1305 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1306 _Find more details on our JSDoc._
1308 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1310 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1312 ### Pool options types declaration merge
1314 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1316 #### New `export` strategy
1320 const DynamicThreadPool = require('poolifier/lib/dynamic')
1322 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1325 But you should always prefer just using
1328 const { DynamicThreadPool } = require('poolifier')
1331 #### New type definitions for input data and response
1333 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1334 _This is not a limitation by poolifier but Node.js._
1336 #### Public property replacements
1338 `numWorkers` property is now `numberOfWorkers`
1340 #### Internal (protected) properties and methods renaming
1342 These properties are not intended for end users
1344 - `id` => `nextMessageId`
1346 These methods are not intended for end users
1348 - `_chooseWorker` => `chooseWorker`
1349 - `_newWorker` => `createWorker`
1350 - `_execute` => `internalExecute`
1351 - `_chooseWorker` => `chooseWorker`
1352 - `_checkAlive` => `checkAlive`
1354 - `_runAsync` => `runAsync`
1356 ## [1.1.0] - 2020-05-21
1360 - ThreadWorker support async functions as option
1361 - Various external library patches
1363 ## [1.0.0] - 2020-01-24
1367 - FixedThreadPool implementation
1368 - DynamicThreadPool implementation
1369 - WorkerThread implementation to improve developer experience