3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
10 ## [3.1.9] - 2023-12-22
14 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
16 ## [3.1.8] - 2023-12-21
20 - Fix default worker weight computation.
21 - Fix possible null exception at pool destroying.
23 ## [3.1.7] - 2023-12-20
27 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
29 ## [3.1.6] - 2023-12-18
33 - Fix pool destroying with tasks queuing enabled.
35 ## [3.1.5] - 2023-12-18
39 - Add queued tasks end timeout support to worker node termination.
41 ## [3.1.4] - 2023-12-18
45 - Make more robust the fix for possible null exception at handling task execution response.
47 ## [3.1.3] - 2023-12-17
51 - Fix possible null exception at handling task execution response.
53 ## [3.1.2] - 2023-12-17
57 - Wait for queued tasks to end at worker node termination.
59 ## [3.1.1] - 2023-12-16
63 - Fix pool options TS type definition.
65 ## [3.1.0] - 2023-12-16
69 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
71 ## [3.0.14] - 2023-12-13
75 - Fix possible null exception with worker_threads pools.
77 ## [3.0.13] - 2023-12-12
81 - Ensure worker choice strategy wait for worker nodes readiness.
85 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
87 ## [3.0.12] - 2023-12-12
91 - Add infinite retries support in worker choice strategy.
93 ## [3.0.11] - 2023-12-11
97 - Ensure pool asynchronous resource properly track tasks execution.
99 ## [3.0.10] - 2023-12-08
103 - Add a fastpath when tasks stealing or redistribution is impossible.
105 ## [3.0.9] - 2023-11-26
109 - Remove all pool events listener at pool destroying.
110 - Remove all worker node events listener at worker node destroying.
111 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
113 ## [3.0.8] - 2023-11-25
117 - Ensure continuous tasks stealing on idle start at worker node idling.
119 ## [3.0.7] - 2023-11-24
123 - Make continuous tasks stealing start at worker node idling.
125 ## [3.0.6] - 2023-11-24
129 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
130 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
132 ## [3.0.5] - 2023-10-27
136 - Ensure pool `ready` event can be emitted only once.
138 ## [3.0.4] - 2023-10-20
142 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
143 - Use builtin retry mechanism in worker choice strategies instead of custom one.
145 ## [3.0.3] - 2023-10-19
149 - Avoid null exception at sending message to worker.
150 - Avoid null exception at checking worker node readiness.
152 ## [3.0.2] - 2023-10-17
156 - 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).
158 ## [3.0.1] - 2023-10-16
162 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
166 - Switch the worker node eventing code to `EventTarget` API.
168 ## [3.0.0] - 2023-10-08
172 - Remove Node.js 16.x.x (EOL) support.
174 ## [2.7.5] - 2023-10-03
178 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
180 ## [2.7.4] - 2023-09-25
184 - Fix source maps (bundler issue).
186 ## [2.7.3] - 2023-09-24
190 - Convert pool event emitter to event emitter async resource.
192 ## [2.7.2] - 2023-09-23
196 - Add source maps to npm package to ease debugging.
200 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
202 ## [2.7.1] - 2023-09-20
206 - Ensure worker message listener used one time are removed after usage.
208 ## [2.7.0] - 2023-09-19
212 - Fix task stealing related tasks queue options handling at runtime.
216 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
220 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
221 - Stricter worker constructor arguments validation.
223 ## [2.6.45] - 2023-09-17
227 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
231 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
232 - Add `start()` method to pool API to start the minimum number of workers.
233 - 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.
234 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
236 ## [2.6.44] - 2023-09-08
240 - Use a dedicated PAT to publish on GitHub packages registry.
244 - Publish on GitHub packages registry on release.
248 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
250 ## [2.6.43] - 2023-09-08
254 - Publish on GitHub packages registry on release.
258 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
260 ## [2.6.42] - 2023-09-06
264 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
266 ## [2.6.41] - 2023-09-03
270 - Optimize worker choice strategies implementation.
272 ## [2.6.40] - 2023-09-01
276 - Do not pre-choose in WRR worker choice strategy to avoid bias.
277 - Avoid array out of bound in worker choice strategies after worker node removal.
279 ## [2.6.39] - 2023-08-30
283 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
285 ## [2.6.38] - 2023-08-30
289 - Bundle typescript types declaration into one file.
293 - Improve interleaved weighted round robin worker choice strategy implementation.
295 ## [2.6.37] - 2023-08-28
299 - Ensure unused worker usage statistics are deleted at runtime.
303 - Rename worker choice strategy options `choiceRetries` to `retries`.
304 - Avoid unnecessary branching in worker choice strategies.
306 ## [2.6.36] - 2023-08-27
310 - Fix pool `execute()` arguments check.
314 - Make continuous tasks stealing algorithm less aggressive.
315 - Fine tune tasks stealing algorithm under back pressure.
317 ## [2.6.35] - 2023-08-25
321 - Don't account worker usage statistics for tasks that have failed.
322 - Fix pool information runtime and wait time median computation.
326 - Update simple moving average implementation to use a circular buffer.
327 - Update simple moving median implementation to use a circular buffer.
328 - Account for stolen tasks in worker usage statistics and pool information.
332 - Continuous tasks stealing algorithm.
334 ## [2.6.34] - 2023-08-24
338 - Avoid cascading tasks stealing under back pressure.
342 - Add fastpath to queued tasks rescheduling.
344 ## [2.6.33] - 2023-08-24
348 - Fix queued tasks rescheduling.
352 - Rename tasks queue options `queueMaxSize` to `size`.
356 - Task stealing scheduling algorithm if tasks queueing is enabled.
358 ## [2.6.32] - 2023-08-23
362 - Ensure no task can be executed when the pool is destroyed.
366 - Add `queueMaxSize` option to tasks queue options.
367 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
368 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
370 ## [2.6.31] - 2023-08-20
374 - Fix worker choice strategy retries mechanism in some edge cases.
378 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
379 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
381 ## [2.6.30] - 2023-08-19
385 - Ensure pool event `backPressure` is emitted.
386 - Ensure pool event `full` is emitted only once.
387 - Ensure worker node cannot be instantiated without proper arguments.
389 ## [2.6.29] - 2023-08-18
393 - Fix race condition between readiness and task functions worker message handling at startup.
394 - Fix duplicate task function worker usage statistics computation per task function.
395 - Update task function worker usage statistics if and only if there's at least two different task functions.
396 - Fix race condition at task function worker usage executing task computation leading to negative value.
400 - 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).
401 - Use back pressure detection in worker choice strategies.
402 - Add worker choice strategies retries mechanism if no worker is eligible.
404 ## [2.6.28] - 2023-08-16
408 - Ensure pool workers are properly initialized.
412 - HTTP server pool examples: express-cluster, express-hybrid.
416 - Remove now useless branching in worker hot code path.
418 ## [2.6.27] - 2023-08-15
422 - Add `KillHandler` type definition to exported types.
426 - Add `destroy` event to pool API.
428 ## [2.6.26] - 2023-08-15
432 - Add kill handler to worker options allowing to execute custom code when worker is killed.
433 - Add `listTaskFunctions()` method to pool API.
434 - SMTP client pool example: nodemailer.
436 ## [2.6.25] - 2023-08-13
440 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
441 - WebSocket server pool examples: ws-cluster, ws-hybrid.
443 ## [2.6.24] - 2023-08-12
447 - Add array of transferable objects to the `execute()` method arguments.
448 - WebSocket server pool examples: ws-worker_threads.
450 ## [2.6.23] - 2023-08-11
454 - 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.
458 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
459 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
461 ## [2.6.22] - 2023-08-10
465 - Add missing `types` field to package.json `exports`.
469 - Structure markdown documentation (PR #811).
471 ## [2.6.21] - 2023-08-03
475 - Improve code documentation.
476 - Code refactoring and cleanup for better maintainability and readability.
478 ## [2.6.20] - 2023-07-21
482 - Fix queued tasks redistribution on error task execution starvation.
483 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
487 - Drastically reduce lookups by worker in the worker nodes.
489 ## [2.6.19] - 2023-07-20
493 - Dedicated internal communication channel for worker_threads pools.
495 ## [2.6.18] - 2023-07-19
499 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
501 ## [2.6.17] - 2023-07-16
505 - Add `listTaskFunctions()` method to worker API.
507 ## [2.6.16] - 2023-07-12
511 - Fix pool startup detection.
512 - Fix worker task functions handling.
514 ## [2.6.15] - 2023-07-11
518 - Take into account worker node readiness in worker choice strategies.
520 ## [2.6.14] - 2023-07-10
524 - Fix task function statistics tracking.
526 ## [2.6.13] - 2023-07-10
530 - Add per task function statistics tracking.
531 - Add public methods to manipulate the worker task functions at runtime.
533 ## [2.6.12] - 2023-07-09
537 - Workaround import issue with `node:os` module in node 16.x.x.
539 ## [2.6.11] - 2023-07-09
543 - Fix pool readiness semantic.
545 ## [2.6.10] - 2023-07-08
549 - Ensure workers are not recreated on error at pool startup.
553 - Add `ready` and `strategy` fields to pool information.
554 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
555 - Add dynamic pool sizing checks.
557 ## [2.6.9] - 2023-07-07
561 - Recreate the right worker type on uncaught exception.
565 - Add minimum and maximum to internal measurement statistics.
566 - Add `runTime` and `waitTime` to pool information.
567 - Check worker inactive time only on dynamic worker.
569 ## [2.6.8] - 2023-07-03
573 - Brown paper bag release to fix version handling in pool information.
575 ## [2.6.7] - 2023-07-03
579 - Ensure worker queued tasks at error are reassigned to other pool workers.
583 - Add pool `utilization` ratio to pool information.
584 - Add `version` to pool information.
585 - Add worker information to worker nodes.
587 ## [2.6.6] - 2023-07-01
591 - Add safe helper `availableParallelism()` to help sizing the pool.
595 - Ensure message handler is only registered in worker.
597 ## [2.6.5] - 2023-06-27
601 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
605 - Artificial version bump to 2.6.5 to workaround publication issue.
606 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
607 - Ensure pool event is emitted before task error promise rejection.
608 - Fix queued tasks count computation.
612 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
614 ## [2.6.4] - 2023-06-27
618 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
622 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
623 - Ensure pool event is emitted before task error promise rejection.
624 - Fix queued tasks count computation.
628 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
630 ## [2.6.3] - 2023-06-19
634 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
635 - Update strategies internals after statistics computation.
639 - Optimize O(1) queue implementation.
641 ## [2.6.2] - 2023-06-12
645 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
647 ## [2.6.1] - 2023-06-10
651 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
655 - Fix average statistics computation: ensure failed tasks are not accounted.
657 ## [2.6.0] - 2023-06-09
661 - Add `LEAST_ELU` worker choice strategy (experimental).
662 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
666 - Refactor pool worker node usage internals.
667 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
668 - Breaking change: pool information `info` property object fields have been renamed.
672 - Fix wait time accounting.
673 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
674 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
676 ## [2.5.4] - 2023-06-07
680 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
684 - Compute statistics at the worker level only if needed.
685 - Add `worker_threads` options to thread pool options.
689 - Make the `LEAST_BUSY` strategy only relies on task runtime.
691 ## [2.5.3] - 2023-06-04
695 - Refine pool information content.
696 - Limit pool internals public exposure.
698 ## [2.5.2] - 2023-06-02
702 - Add `taskError` pool event for task execution error.
703 - Add pool information `info` property to pool.
704 - Emit pool information on `busy` and `full` pool events.
706 ## [2.5.1] - 2023-06-01
710 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
711 - Add `error` pool event for uncaught worker error.
713 ## [2.5.0] - 2023-05-31
717 - Switch pool event emitter to `EventEmitterAsyncResource`.
718 - Add tasks wait time accounting in per worker tasks usage.
719 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
723 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
725 ## [2.4.14] - 2023-05-09
729 - Ensure no undefined task runtime can land in the tasks history.
730 - Fix median computation implementation once again.
734 - Unit tests for median and queue implementations.
736 ## [2.4.13] - 2023-05-08
740 - Fix worker choice strategy options validation.
741 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
743 ## [2.4.12] - 2023-05-06
747 - Support multiple task functions per worker.
748 - Add custom worker weights support to worker choice strategies options.
752 - Use O(1) queue implementation for tasks queueing.
756 - Fix median computation implementation.
757 - Fix fair share worker choice strategy internals update.
759 ## [2.4.11] - 2023-04-23
763 - Optimize free worker finding in worker choice strategies.
765 ## [2.4.10] - 2023-04-15
769 - Fix typescript type definition for task function: ensure the input data is optional.
770 - Fix typescript type definition for pool execute(): ensure the input data is optional.
772 ## [2.4.9] - 2023-04-15
776 - Add tasks queue enablement runtime setter to pool.
777 - Add tasks queue options runtime setter to pool.
778 - Add worker choice strategy options runtime setter to pool.
782 - Remove the tasks queuing experimental status.
786 - Fix task function type definition and validation.
787 - Fix worker choice strategy options handling.
789 ## [2.4.8] - 2023-04-12
793 - Fix message between main worker and worker type definition for tasks.
794 - Fix code documentation.
796 ## [2.4.7] - 2023-04-11
800 - Add worker tasks queue options to pool options.
804 - Fix missing documentation.
806 ## [2.4.6] - 2023-04-10
810 - Ensure one task at a time is executed per worker with tasks queueing enabled.
811 - Properly count worker executing tasks with tasks queueing enabled.
813 ## [2.4.5] - 2023-04-09
817 - Use monotonic high resolution timer for worker tasks runtime.
818 - Add worker tasks median runtime to statistics.
819 - Add worker tasks queue (experimental).
821 ## [2.4.4] - 2023-04-07
825 - Add `PoolEvents` enumeration and `PoolEvent` type.
829 - Destroy worker only on alive check.
831 ## [2.4.3] - 2023-04-07
835 - Fix typedoc generation with inheritance.
837 ## [2.4.2] - 2023-04-06
841 - Add `full` event to dynamic pool.
842 - Keep worker choice strategy in memory for conditional reuse.
846 - Fix possible negative worker key at worker removal in worker choice strategies.
848 ## [2.4.1] - 2023-04-05
852 - Optimize worker choice strategy for dynamic pool.
856 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
858 ## [2.4.0] - 2023-04-04
862 - Add `LESS_BUSY` worker choice strategy.
866 - Optimize worker storage in pool.
867 - Optimize worker alive status check.
868 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
869 - Optimize `LESS_USED` worker choice strategy.
870 - Update benchmark versus external threads pools.
871 - Optimize tasks usage statistics requirements for worker choice strategy.
875 - Ensure trimmable characters are checked at pool initialization.
876 - Fix message id integer overflow.
877 - Fix pool worker removal in worker choice strategy internals.
878 - Fix package publication with pnpm.
880 ## [2.4.0-3] - 2023-04-04
884 - Add `LESS_BUSY` worker choice strategy.
888 - Optimize worker storage in pool.
889 - Optimize worker alive status check.
890 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
891 - Optimize `LESS_USED` worker choice strategy.
892 - Update benchmark versus external threads pools.
896 - Ensure trimmable characters are checked at pool initialization.
897 - Fix message id integer overflow.
898 - Fix pool worker removal in worker choice strategy internals.
899 - Fix package publication with pnpm.
901 ## [2.4.0-2] - 2023-04-03
905 - Add `LESS_BUSY` worker choice strategy.
909 - Optimize worker storage in pool.
910 - Optimize worker alive status check.
911 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
912 - Optimize `LESS_USED` worker choice strategy.
916 - Ensure trimmable characters are checked at pool initialization.
917 - Fix message id integer overflow.
918 - Fix pool worker removal in worker choice strategy internals.
919 - Fix package publication with pnpm.
921 ## [2.4.0-1] - 2023-04-03
925 - Add `LESS_BUSY` worker choice strategy.
929 - Optimize worker storage in pool.
930 - Optimize worker alive status check.
931 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
932 - Optimize `LESS_USED` worker choice strategy.
936 - Ensure trimmable characters are checked at pool initialization.
937 - Fix message id integer overflow.
938 - Fix pool worker removal in worker choice strategy internals.
940 ## [2.4.0-0] - 2023-04-03
944 - Add `LESS_BUSY` worker choice strategy.
948 - Optimize worker storage in pool.
949 - Optimize worker alive status check.
950 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
951 - Optimize `LESS_USED` worker choice strategy.
955 - Ensure trimmable characters are checked at pool initialization.
956 - Fix message id integer overflow.
957 - Fix pool worker removal in worker choice strategy internals.
959 ## [2.3.10] - 2023-03-18
963 - Fix package.json `exports` syntax for ESM and CommonJS.
967 - Permit SemVer pre-release publication.
969 ## [2.3.10-2] - 2023-03-18
973 - Fix package.json `exports` syntax for ESM and CommonJS.
975 ## [2.3.10-1] - 2023-03-18
979 - Permit SemVer pre-release publication.
981 ## [2.3.10-0] - 2023-03-18
985 - Fix package.json `exports` syntax for ESM and CommonJS.
987 ## [2.3.9] - 2023-03-18
991 - Introduce ESM module support along with CommonJS one.
995 - Fix brown paper bag bug referencing the same object literal.
997 ## [2.3.8] - 2023-03-18
1001 - Switch internal benchmarking code to benny.
1002 - Switch to TypeScript 5.x.x.
1003 - Switch rollup bundler plugins to core ones.
1004 - Switch to TSDoc syntax.
1005 - Enforce conventional commits.
1009 - Fix random integer generator.
1010 - Fix worker choice strategy pool type identification at initialization.
1012 ## [2.3.7] - 2022-10-23
1016 - Switch to open collective FOSS project funding platform.
1017 - Switch to ts-standard linter configuration on TypeScript code.
1021 - Fixed missing async on pool execute method.
1022 - Fixed typing in TypeScript example.
1023 - Fixed types in unit tests.
1025 ## [2.3.6] - 2022-10-22
1029 - Cleanup pool attributes and methods.
1030 - Refine error types thrown.
1034 - Fix continuous integration build on windows.
1035 - Fix code coverage reporting by using c8 instead of nyc.
1037 ## [2.3.5] - 2022-10-21
1041 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1042 - Optimize tasks usage lookup implementation.
1046 - Fix missed pool event emitter type export.
1047 - Fix typedoc documentation generation.
1049 ## [2.3.4] - 2022-10-17
1053 - Fully automate release process with release-it.
1057 - Optimize fair share task scheduling algorithm implementation.
1058 - Update benchmark versus external pools results with latest version.
1060 ## [2.3.3] - 2022-10-15
1064 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1066 ## [2.3.2] - 2022-10-14
1070 - Optimize fair share worker selection strategy implementation.
1074 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1076 ## [2.3.1] - 2022-10-13
1080 - Pool worker choice strategies:
1081 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1082 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1084 ## [2.2.2] - 2022-10-09
1088 - Fixed `README.md` file.
1090 ## [2.2.1] - 2022-10-08
1094 - Dynamic worker choice strategy change at runtime.
1096 ## [2.2.0] - 2022-01-05
1098 ### Breaking Changes
1100 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1102 ## [2.1.0] - 2021-08-29
1106 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1108 ### Breaking Changes
1110 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1111 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1112 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1113 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1115 ## [2.0.2] - 2021-05-12
1119 - Fix `busy` event emission on fixed pool type
1121 ## [2.0.1] - 2021-03-16
1125 - Check if pool options are properly set.
1126 - `busy` event is emitted on all pool types.
1128 ## [2.0.0] - 2021-03-01
1132 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1134 ### Breaking Changes
1136 - `FullPool` event is now renamed to `busy`.
1137 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1138 _Find more details on our JSDoc._
1140 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1142 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1144 ### Pool options types declaration merge
1146 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1148 #### New `export` strategy
1152 const DynamicThreadPool = require('poolifier/lib/dynamic')
1154 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1157 But you should always prefer just using
1160 const { DynamicThreadPool } = require('poolifier')
1163 #### New type definitions for input data and response
1165 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1166 _This is not a limitation by poolifier but Node.js._
1168 #### Public property replacements
1170 `numWorkers` property is now `numberOfWorkers`
1172 #### Internal (protected) properties and methods renaming
1174 These properties are not intended for end users
1176 - `id` => `nextMessageId`
1178 These methods are not intended for end users
1180 - `_chooseWorker` => `chooseWorker`
1181 - `_newWorker` => `createWorker`
1182 - `_execute` => `internalExecute`
1183 - `_chooseWorker` => `chooseWorker`
1184 - `_checkAlive` => `checkAlive`
1186 - `_runAsync` => `runAsync`
1188 ## [1.1.0] - 2020-05-21
1192 - ThreadWorker support async functions as option
1193 - Various external library patches
1195 ## [1.0.0] - 2020-01-24
1199 - FixedThreadPool implementation
1200 - DynamicThreadPool implementation
1201 - WorkerThread implementation to improve developer experience