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 ## [4.0.5] - 2024-05-09
14 - Avoid queued tasks redistribution on the errored worker node.
16 ## [4.0.4] - 2024-05-08
20 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
22 ## [4.0.3] - 2024-05-08
26 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
28 ## [4.0.2] - 2024-05-06
32 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
34 ## [4.0.1] - 2024-05-02
38 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
39 - 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.
41 ## [4.0.0] - 2024-04-30
45 - 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 }`.
46 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
47 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
48 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
52 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
54 ## [3.1.30] - 2024-04-22
58 - Fix `transferList` argument type definition.
60 ## [3.1.29] - 2024-04-02
64 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
66 ## [3.1.28] - 2024-04-01
70 - Ensure the minimum number of workers on a started pool is guaranteed.
72 ## [3.1.27] - 2024-03-27
76 - Fix publishing on JSR, take 4.
78 ## [3.1.26] - 2024-03-27
82 - Fix publishing on JSR, take 3.
84 ## [3.1.25] - 2024-03-27
88 - Fix publishing on JSR, take 2.
90 ## [3.1.24] - 2024-03-27
94 - Fix publishing on JSR.
96 ## [3.1.23] - 2024-03-27
102 ## [3.1.22] - 2024-03-15
106 - Fix pool event emitter registered callbacks removal at `destroy()`.
108 ## [3.1.21] - 2024-02-22
112 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
114 ## [3.1.20] - 2024-02-11
118 - Ensure `worker_threads` workers are unreferenced at termination.
120 ## [3.1.19] - 2024-01-16
124 - Fix possible null exception at task finishing handling.
128 - Optimize Deque implementation to improve tasks queueing performance.
130 ## [3.1.18] - 2024-01-06
134 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
136 ## [3.1.17] - 2024-01-05
140 - Improve performance by clean up unneeded condition checks on hot code paths.
142 ## [3.1.16] - 2024-01-03
146 - Add missing type to TS type definitions.
148 ## [3.1.15] - 2024-01-02
152 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
154 ## [3.1.15-0] - 2024-01-02
158 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
160 ## [3.1.14] - 2024-01-01
164 - Properly handle dynamic pool with zero minimum size.
166 ## [3.1.13] - 2023-12-30
170 - Reduce branching in several hot code paths.
171 - Use faster object cloning implementation.
173 ## [3.1.12] - 2023-12-27
177 - Fix tasks redistribution triggers at pool destroying.
181 - Switch TypeScript module resolution to Node16.
183 ## [3.1.12-0] - 2023-12-27
187 - Fix tasks redistribution triggers at pool destroying.
189 ## [3.1.11] - 2023-12-24
193 - Avoid worker node cross tasks stealing.
194 - Ensure only half the pool worker nodes can steal tasks.
196 ## [3.1.10] - 2023-12-23
200 - Avoid useless branching on pool type.
202 ## [3.1.9] - 2023-12-22
206 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
208 ## [3.1.8] - 2023-12-21
212 - Fix default worker weight computation.
213 - Fix possible null exception at pool destroying.
215 ## [3.1.7] - 2023-12-20
219 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
221 ## [3.1.6] - 2023-12-18
225 - Fix pool destroying with tasks queuing enabled.
227 ## [3.1.5] - 2023-12-18
231 - Add queued tasks end timeout support to worker node termination.
233 ## [3.1.4] - 2023-12-18
237 - Make more robust the fix for possible null exception at handling task execution response.
239 ## [3.1.3] - 2023-12-17
243 - Fix possible null exception at handling task execution response.
245 ## [3.1.2] - 2023-12-17
249 - Wait for queued tasks to end at worker node termination.
251 ## [3.1.1] - 2023-12-16
255 - Fix pool options TS type definition.
257 ## [3.1.0] - 2023-12-16
261 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
263 ## [3.0.14] - 2023-12-13
267 - Fix possible null exception with worker_threads pools.
269 ## [3.0.13] - 2023-12-12
273 - Ensure worker choice strategy wait for worker nodes readiness.
277 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
279 ## [3.0.12] - 2023-12-12
283 - Add infinite retries support in worker choice strategy.
285 ## [3.0.11] - 2023-12-11
289 - Ensure pool asynchronous resource properly track tasks execution.
291 ## [3.0.10] - 2023-12-08
295 - Add a fastpath when tasks stealing or redistribution is impossible.
297 ## [3.0.9] - 2023-11-26
301 - Remove all pool events listener at pool destroying.
302 - Remove all worker node events listener at worker node destroying.
303 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
305 ## [3.0.8] - 2023-11-25
309 - Ensure continuous tasks stealing on idle start at worker node idling.
311 ## [3.0.7] - 2023-11-24
315 - Make continuous tasks stealing start at worker node idling.
317 ## [3.0.6] - 2023-11-24
321 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
322 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
324 ## [3.0.5] - 2023-10-27
328 - Ensure pool `ready` event can be emitted only once.
330 ## [3.0.4] - 2023-10-20
334 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
335 - Use builtin retry mechanism in worker choice strategies instead of custom one.
337 ## [3.0.3] - 2023-10-19
341 - Avoid null exception at sending message to worker.
342 - Avoid null exception at checking worker node readiness.
344 ## [3.0.2] - 2023-10-17
348 - 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).
350 ## [3.0.1] - 2023-10-16
354 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
358 - Switch the worker node eventing code to `EventTarget` API.
360 ## [3.0.0] - 2023-10-08
364 - Remove Node.js 16.x.x (EOL) support.
366 ## [2.7.5] - 2023-10-03
370 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
372 ## [2.7.4] - 2023-09-25
376 - Fix source maps (bundler issue).
378 ## [2.7.3] - 2023-09-24
382 - Convert pool event emitter to event emitter async resource.
384 ## [2.7.2] - 2023-09-23
388 - Add source maps to npm package to ease debugging.
392 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
394 ## [2.7.1] - 2023-09-20
398 - Ensure worker message listener used one time are removed after usage.
400 ## [2.7.0] - 2023-09-19
404 - Fix task stealing related tasks queue options handling at runtime.
408 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
412 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
413 - Stricter worker constructor arguments validation.
415 ## [2.6.45] - 2023-09-17
419 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
423 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
424 - Add `start()` method to pool API to start the minimum number of workers.
425 - 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.
426 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
428 ## [2.6.44] - 2023-09-08
432 - Use a dedicated PAT to publish on GitHub packages registry.
436 - Publish on GitHub packages registry on release.
440 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
442 ## [2.6.43] - 2023-09-08
446 - Publish on GitHub packages registry on release.
450 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
452 ## [2.6.42] - 2023-09-06
456 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
458 ## [2.6.41] - 2023-09-03
462 - Optimize worker choice strategies implementation.
464 ## [2.6.40] - 2023-09-01
468 - Do not pre-choose in WRR worker choice strategy to avoid bias.
469 - Avoid array out of bound in worker choice strategies after worker node removal.
471 ## [2.6.39] - 2023-08-30
475 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
477 ## [2.6.38] - 2023-08-30
481 - Bundle typescript types declaration into one file.
485 - Improve interleaved weighted round robin worker choice strategy implementation.
487 ## [2.6.37] - 2023-08-28
491 - Ensure unused worker usage statistics are deleted at runtime.
495 - Rename worker choice strategy options `choiceRetries` to `retries`.
496 - Avoid unnecessary branching in worker choice strategies.
498 ## [2.6.36] - 2023-08-27
502 - Fix pool `execute()` arguments check.
506 - Make continuous tasks stealing algorithm less aggressive.
507 - Fine tune tasks stealing algorithm under back pressure.
509 ## [2.6.35] - 2023-08-25
513 - Don't account worker usage statistics for tasks that have failed.
514 - Fix pool information runtime and wait time median computation.
518 - Update simple moving average implementation to use a circular buffer.
519 - Update simple moving median implementation to use a circular buffer.
520 - Account for stolen tasks in worker usage statistics and pool information.
524 - Continuous tasks stealing algorithm.
526 ## [2.6.34] - 2023-08-24
530 - Avoid cascading tasks stealing under back pressure.
534 - Add fastpath to queued tasks rescheduling.
536 ## [2.6.33] - 2023-08-24
540 - Fix queued tasks rescheduling.
544 - Rename tasks queue options `queueMaxSize` to `size`.
548 - Task stealing scheduling algorithm if tasks queueing is enabled.
550 ## [2.6.32] - 2023-08-23
554 - Ensure no task can be executed when the pool is destroyed.
558 - Add `queueMaxSize` option to tasks queue options.
559 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
560 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
562 ## [2.6.31] - 2023-08-20
566 - Fix worker choice strategy retries mechanism in some edge cases.
570 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
571 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
573 ## [2.6.30] - 2023-08-19
577 - Ensure pool event `backPressure` is emitted.
578 - Ensure pool event `full` is emitted only once.
579 - Ensure worker node cannot be instantiated without proper arguments.
581 ## [2.6.29] - 2023-08-18
585 - Fix race condition between readiness and task functions worker message handling at startup.
586 - Fix duplicate task function worker usage statistics computation per task function.
587 - Update task function worker usage statistics if and only if there's at least two different task functions.
588 - Fix race condition at task function worker usage executing task computation leading to negative value.
592 - 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).
593 - Use back pressure detection in worker choice strategies.
594 - Add worker choice strategies retries mechanism if no worker is eligible.
596 ## [2.6.28] - 2023-08-16
600 - Ensure pool workers are properly initialized.
604 - HTTP server pool examples: express-cluster, express-hybrid.
608 - Remove now useless branching in worker hot code path.
610 ## [2.6.27] - 2023-08-15
614 - Add `KillHandler` type definition to exported types.
618 - Add `destroy` event to pool API.
620 ## [2.6.26] - 2023-08-15
624 - Add kill handler to worker options allowing to execute custom code when worker is killed.
625 - Add `listTaskFunctions()` method to pool API.
626 - SMTP client pool example: nodemailer.
628 ## [2.6.25] - 2023-08-13
632 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
633 - WebSocket server pool examples: ws-cluster, ws-hybrid.
635 ## [2.6.24] - 2023-08-12
639 - Add array of transferable objects to the `execute()` method arguments.
640 - WebSocket server pool examples: ws-worker_threads.
642 ## [2.6.23] - 2023-08-11
646 - 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.
650 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
651 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
653 ## [2.6.22] - 2023-08-10
657 - Add missing `types` field to package.json `exports`.
661 - Structure markdown documentation (PR #811).
663 ## [2.6.21] - 2023-08-03
667 - Improve code documentation.
668 - Code refactoring and cleanup for better maintainability and readability.
670 ## [2.6.20] - 2023-07-21
674 - Fix queued tasks redistribution on error task execution starvation.
675 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
679 - Drastically reduce lookups by worker in the worker nodes.
681 ## [2.6.19] - 2023-07-20
685 - Dedicated internal communication channel for worker_threads pools.
687 ## [2.6.18] - 2023-07-19
691 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
693 ## [2.6.17] - 2023-07-16
697 - Add `listTaskFunctions()` method to worker API.
699 ## [2.6.16] - 2023-07-12
703 - Fix pool startup detection.
704 - Fix worker task functions handling.
706 ## [2.6.15] - 2023-07-11
710 - Take into account worker node readiness in worker choice strategies.
712 ## [2.6.14] - 2023-07-10
716 - Fix task function statistics tracking.
718 ## [2.6.13] - 2023-07-10
722 - Add per task function statistics tracking.
723 - Add public methods to manipulate the worker task functions at runtime.
725 ## [2.6.12] - 2023-07-09
729 - Workaround import issue with `node:os` module in node 16.x.x.
731 ## [2.6.11] - 2023-07-09
735 - Fix pool readiness semantic.
737 ## [2.6.10] - 2023-07-08
741 - Ensure workers are not recreated on error at pool startup.
745 - Add `ready` and `strategy` fields to pool information.
746 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
747 - Add dynamic pool sizing checks.
749 ## [2.6.9] - 2023-07-07
753 - Recreate the right worker type on uncaught exception.
757 - Add minimum and maximum to internal measurement statistics.
758 - Add `runTime` and `waitTime` to pool information.
759 - Check worker inactive time only on dynamic worker.
761 ## [2.6.8] - 2023-07-03
765 - Brown paper bag release to fix version handling in pool information.
767 ## [2.6.7] - 2023-07-03
771 - Ensure worker queued tasks at error are reassigned to other pool workers.
775 - Add pool `utilization` ratio to pool information.
776 - Add `version` to pool information.
777 - Add worker information to worker nodes.
779 ## [2.6.6] - 2023-07-01
783 - Add safe helper `availableParallelism()` to help sizing the pool.
787 - Ensure message handler is only registered in worker.
789 ## [2.6.5] - 2023-06-27
793 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
797 - Artificial version bump to 2.6.5 to workaround publication issue.
798 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
799 - Ensure pool event is emitted before task error promise rejection.
800 - Fix queued tasks count computation.
804 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
806 ## [2.6.4] - 2023-06-27
810 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
814 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
815 - Ensure pool event is emitted before task error promise rejection.
816 - Fix queued tasks count computation.
820 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
822 ## [2.6.3] - 2023-06-19
826 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
827 - Update strategies internals after statistics computation.
831 - Optimize O(1) queue implementation.
833 ## [2.6.2] - 2023-06-12
837 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
839 ## [2.6.1] - 2023-06-10
843 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
847 - Fix average statistics computation: ensure failed tasks are not accounted.
849 ## [2.6.0] - 2023-06-09
853 - Add `LEAST_ELU` worker choice strategy (experimental).
854 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
858 - Refactor pool worker node usage internals.
859 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
860 - Breaking change: pool information `info` property object fields have been renamed.
864 - Fix wait time accounting.
865 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
866 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
868 ## [2.5.4] - 2023-06-07
872 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
876 - Compute statistics at the worker level only if needed.
877 - Add `worker_threads` options to thread pool options.
881 - Make the `LEAST_BUSY` strategy only relies on task runtime.
883 ## [2.5.3] - 2023-06-04
887 - Refine pool information content.
888 - Limit pool internals public exposure.
890 ## [2.5.2] - 2023-06-02
894 - Add `taskError` pool event for task execution error.
895 - Add pool information `info` property to pool.
896 - Emit pool information on `busy` and `full` pool events.
898 ## [2.5.1] - 2023-06-01
902 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
903 - Add `error` pool event for uncaught worker error.
905 ## [2.5.0] - 2023-05-31
909 - Switch pool event emitter to `EventEmitterAsyncResource`.
910 - Add tasks wait time accounting in per worker tasks usage.
911 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
915 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
917 ## [2.4.14] - 2023-05-09
921 - Ensure no undefined task runtime can land in the tasks history.
922 - Fix median computation implementation once again.
926 - Unit tests for median and queue implementations.
928 ## [2.4.13] - 2023-05-08
932 - Fix worker choice strategy options validation.
933 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
935 ## [2.4.12] - 2023-05-06
939 - Support multiple task functions per worker.
940 - Add custom worker weights support to worker choice strategies options.
944 - Use O(1) queue implementation for tasks queueing.
948 - Fix median computation implementation.
949 - Fix fair share worker choice strategy internals update.
951 ## [2.4.11] - 2023-04-23
955 - Optimize free worker finding in worker choice strategies.
957 ## [2.4.10] - 2023-04-15
961 - Fix typescript type definition for task function: ensure the input data is optional.
962 - Fix typescript type definition for pool execute(): ensure the input data is optional.
964 ## [2.4.9] - 2023-04-15
968 - Add tasks queue enablement runtime setter to pool.
969 - Add tasks queue options runtime setter to pool.
970 - Add worker choice strategy options runtime setter to pool.
974 - Remove the tasks queuing experimental status.
978 - Fix task function type definition and validation.
979 - Fix worker choice strategy options handling.
981 ## [2.4.8] - 2023-04-12
985 - Fix message between main worker and worker type definition for tasks.
986 - Fix code documentation.
988 ## [2.4.7] - 2023-04-11
992 - Add worker tasks queue options to pool options.
996 - Fix missing documentation.
998 ## [2.4.6] - 2023-04-10
1002 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1003 - Properly count worker executing tasks with tasks queueing enabled.
1005 ## [2.4.5] - 2023-04-09
1009 - Use monotonic high resolution timer for worker tasks runtime.
1010 - Add worker tasks median runtime to statistics.
1011 - Add worker tasks queue (experimental).
1013 ## [2.4.4] - 2023-04-07
1017 - Add `PoolEvents` enumeration and `PoolEvent` type.
1021 - Destroy worker only on alive check.
1023 ## [2.4.3] - 2023-04-07
1027 - Fix typedoc generation with inheritance.
1029 ## [2.4.2] - 2023-04-06
1033 - Add `full` event to dynamic pool.
1034 - Keep worker choice strategy in memory for conditional reuse.
1038 - Fix possible negative worker key at worker removal in worker choice strategies.
1040 ## [2.4.1] - 2023-04-05
1044 - Optimize worker choice strategy for dynamic pool.
1048 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1050 ## [2.4.0] - 2023-04-04
1054 - Add `LESS_BUSY` worker choice strategy.
1058 - Optimize worker storage in pool.
1059 - Optimize worker alive status check.
1060 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1061 - Optimize `LESS_USED` worker choice strategy.
1062 - Update benchmark versus external threads pools.
1063 - Optimize tasks usage statistics requirements for worker choice strategy.
1067 - Ensure trimmable characters are checked at pool initialization.
1068 - Fix message id integer overflow.
1069 - Fix pool worker removal in worker choice strategy internals.
1070 - Fix package publication with pnpm.
1072 ## [2.4.0-3] - 2023-04-04
1076 - Add `LESS_BUSY` worker choice strategy.
1080 - Optimize worker storage in pool.
1081 - Optimize worker alive status check.
1082 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1083 - Optimize `LESS_USED` worker choice strategy.
1084 - Update benchmark versus external threads pools.
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 ## [2.4.0-2] - 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.
1111 - Fix package publication with pnpm.
1113 ## [2.4.0-1] - 2023-04-03
1117 - Add `LESS_BUSY` worker choice strategy.
1121 - Optimize worker storage in pool.
1122 - Optimize worker alive status check.
1123 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1124 - Optimize `LESS_USED` worker choice strategy.
1128 - Ensure trimmable characters are checked at pool initialization.
1129 - Fix message id integer overflow.
1130 - Fix pool worker removal in worker choice strategy internals.
1132 ## [2.4.0-0] - 2023-04-03
1136 - Add `LESS_BUSY` worker choice strategy.
1140 - Optimize worker storage in pool.
1141 - Optimize worker alive status check.
1142 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1143 - Optimize `LESS_USED` worker choice strategy.
1147 - Ensure trimmable characters are checked at pool initialization.
1148 - Fix message id integer overflow.
1149 - Fix pool worker removal in worker choice strategy internals.
1151 ## [2.3.10] - 2023-03-18
1155 - Fix package.json `exports` syntax for ESM and CommonJS.
1159 - Permit SemVer pre-release publication.
1161 ## [2.3.10-2] - 2023-03-18
1165 - Fix package.json `exports` syntax for ESM and CommonJS.
1167 ## [2.3.10-1] - 2023-03-18
1171 - Permit SemVer pre-release publication.
1173 ## [2.3.10-0] - 2023-03-18
1177 - Fix package.json `exports` syntax for ESM and CommonJS.
1179 ## [2.3.9] - 2023-03-18
1183 - Introduce ESM module support along with CommonJS one.
1187 - Fix brown paper bag bug referencing the same object literal.
1189 ## [2.3.8] - 2023-03-18
1193 - Switch internal benchmarking code to benny.
1194 - Switch to TypeScript 5.x.x.
1195 - Switch rollup bundler plugins to core ones.
1196 - Switch to TSDoc syntax.
1197 - Enforce conventional commits.
1201 - Fix random integer generator.
1202 - Fix worker choice strategy pool type identification at initialization.
1204 ## [2.3.7] - 2022-10-23
1208 - Switch to open collective FOSS project funding platform.
1209 - Switch to ts-standard linter configuration on TypeScript code.
1213 - Fixed missing async on pool execute method.
1214 - Fixed typing in TypeScript example.
1215 - Fixed types in unit tests.
1217 ## [2.3.6] - 2022-10-22
1221 - Cleanup pool attributes and methods.
1222 - Refine error types thrown.
1226 - Fix continuous integration build on windows.
1227 - Fix code coverage reporting by using c8 instead of nyc.
1229 ## [2.3.5] - 2022-10-21
1233 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1234 - Optimize tasks usage lookup implementation.
1238 - Fix missed pool event emitter type export.
1239 - Fix typedoc documentation generation.
1241 ## [2.3.4] - 2022-10-17
1245 - Fully automate release process with release-it.
1249 - Optimize fair share task scheduling algorithm implementation.
1250 - Update benchmark versus external pools results with latest version.
1252 ## [2.3.3] - 2022-10-15
1256 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1258 ## [2.3.2] - 2022-10-14
1262 - Optimize fair share worker selection strategy implementation.
1266 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1268 ## [2.3.1] - 2022-10-13
1272 - Pool worker choice strategies:
1273 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1274 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1276 ## [2.2.2] - 2022-10-09
1280 - Fixed `README.md` file.
1282 ## [2.2.1] - 2022-10-08
1286 - Dynamic worker choice strategy change at runtime.
1288 ## [2.2.0] - 2022-01-05
1290 ### Breaking Changes
1292 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1294 ## [2.1.0] - 2021-08-29
1298 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1300 ### Breaking Changes
1302 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1303 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1304 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1305 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1307 ## [2.0.2] - 2021-05-12
1311 - Fix `busy` event emission on fixed pool type
1313 ## [2.0.1] - 2021-03-16
1317 - Check if pool options are properly set.
1318 - `busy` event is emitted on all pool types.
1320 ## [2.0.0] - 2021-03-01
1324 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1326 ### Breaking Changes
1328 - `FullPool` event is now renamed to `busy`.
1329 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1330 _Find more details on our JSDoc._
1332 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1334 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1336 ### Pool options types declaration merge
1338 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1340 #### New `export` strategy
1344 const DynamicThreadPool = require('poolifier/lib/dynamic')
1346 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1349 But you should always prefer just using
1352 const { DynamicThreadPool } = require('poolifier')
1355 #### New type definitions for input data and response
1357 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1358 _This is not a limitation by poolifier but Node.js._
1360 #### Public property replacements
1362 `numWorkers` property is now `numberOfWorkers`
1364 #### Internal (protected) properties and methods renaming
1366 These properties are not intended for end users
1368 - `id` => `nextMessageId`
1370 These methods are not intended for end users
1372 - `_chooseWorker` => `chooseWorker`
1373 - `_newWorker` => `createWorker`
1374 - `_execute` => `internalExecute`
1375 - `_chooseWorker` => `chooseWorker`
1376 - `_checkAlive` => `checkAlive`
1378 - `_runAsync` => `runAsync`
1380 ## [1.1.0] - 2020-05-21
1384 - ThreadWorker support async functions as option
1385 - Various external library patches
1387 ## [1.0.0] - 2020-01-24
1391 - FixedThreadPool implementation
1392 - DynamicThreadPool implementation
1393 - WorkerThread implementation to improve developer experience