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 - Fix tasks redistribution triggers at pool destroying.
16 - Switch TypeScript module resolution to Node16.
18 ## [3.1.12-0] - 2023-12-27
22 - Fix tasks redistribution triggers at pool destroying.
24 ## [3.1.11] - 2023-12-24
28 - Avoid worker node cross tasks stealing.
29 - Ensure only half the pool worker nodes can steal tasks.
31 ## [3.1.10] - 2023-12-23
35 - Avoid useless branching on pool type.
37 ## [3.1.9] - 2023-12-22
41 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
43 ## [3.1.8] - 2023-12-21
47 - Fix default worker weight computation.
48 - Fix possible null exception at pool destroying.
50 ## [3.1.7] - 2023-12-20
54 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
56 ## [3.1.6] - 2023-12-18
60 - Fix pool destroying with tasks queuing enabled.
62 ## [3.1.5] - 2023-12-18
66 - Add queued tasks end timeout support to worker node termination.
68 ## [3.1.4] - 2023-12-18
72 - Make more robust the fix for possible null exception at handling task execution response.
74 ## [3.1.3] - 2023-12-17
78 - Fix possible null exception at handling task execution response.
80 ## [3.1.2] - 2023-12-17
84 - Wait for queued tasks to end at worker node termination.
86 ## [3.1.1] - 2023-12-16
90 - Fix pool options TS type definition.
92 ## [3.1.0] - 2023-12-16
96 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
98 ## [3.0.14] - 2023-12-13
102 - Fix possible null exception with worker_threads pools.
104 ## [3.0.13] - 2023-12-12
108 - Ensure worker choice strategy wait for worker nodes readiness.
112 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
114 ## [3.0.12] - 2023-12-12
118 - Add infinite retries support in worker choice strategy.
120 ## [3.0.11] - 2023-12-11
124 - Ensure pool asynchronous resource properly track tasks execution.
126 ## [3.0.10] - 2023-12-08
130 - Add a fastpath when tasks stealing or redistribution is impossible.
132 ## [3.0.9] - 2023-11-26
136 - Remove all pool events listener at pool destroying.
137 - Remove all worker node events listener at worker node destroying.
138 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
140 ## [3.0.8] - 2023-11-25
144 - Ensure continuous tasks stealing on idle start at worker node idling.
146 ## [3.0.7] - 2023-11-24
150 - Make continuous tasks stealing start at worker node idling.
152 ## [3.0.6] - 2023-11-24
156 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
157 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
159 ## [3.0.5] - 2023-10-27
163 - Ensure pool `ready` event can be emitted only once.
165 ## [3.0.4] - 2023-10-20
169 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
170 - Use builtin retry mechanism in worker choice strategies instead of custom one.
172 ## [3.0.3] - 2023-10-19
176 - Avoid null exception at sending message to worker.
177 - Avoid null exception at checking worker node readiness.
179 ## [3.0.2] - 2023-10-17
183 - 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).
185 ## [3.0.1] - 2023-10-16
189 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
193 - Switch the worker node eventing code to `EventTarget` API.
195 ## [3.0.0] - 2023-10-08
199 - Remove Node.js 16.x.x (EOL) support.
201 ## [2.7.5] - 2023-10-03
205 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
207 ## [2.7.4] - 2023-09-25
211 - Fix source maps (bundler issue).
213 ## [2.7.3] - 2023-09-24
217 - Convert pool event emitter to event emitter async resource.
219 ## [2.7.2] - 2023-09-23
223 - Add source maps to npm package to ease debugging.
227 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
229 ## [2.7.1] - 2023-09-20
233 - Ensure worker message listener used one time are removed after usage.
235 ## [2.7.0] - 2023-09-19
239 - Fix task stealing related tasks queue options handling at runtime.
243 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
247 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
248 - Stricter worker constructor arguments validation.
250 ## [2.6.45] - 2023-09-17
254 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
258 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
259 - Add `start()` method to pool API to start the minimum number of workers.
260 - 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.
261 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
263 ## [2.6.44] - 2023-09-08
267 - Use a dedicated PAT to publish on GitHub packages registry.
271 - Publish on GitHub packages registry on release.
275 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
277 ## [2.6.43] - 2023-09-08
281 - Publish on GitHub packages registry on release.
285 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
287 ## [2.6.42] - 2023-09-06
291 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
293 ## [2.6.41] - 2023-09-03
297 - Optimize worker choice strategies implementation.
299 ## [2.6.40] - 2023-09-01
303 - Do not pre-choose in WRR worker choice strategy to avoid bias.
304 - Avoid array out of bound in worker choice strategies after worker node removal.
306 ## [2.6.39] - 2023-08-30
310 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
312 ## [2.6.38] - 2023-08-30
316 - Bundle typescript types declaration into one file.
320 - Improve interleaved weighted round robin worker choice strategy implementation.
322 ## [2.6.37] - 2023-08-28
326 - Ensure unused worker usage statistics are deleted at runtime.
330 - Rename worker choice strategy options `choiceRetries` to `retries`.
331 - Avoid unnecessary branching in worker choice strategies.
333 ## [2.6.36] - 2023-08-27
337 - Fix pool `execute()` arguments check.
341 - Make continuous tasks stealing algorithm less aggressive.
342 - Fine tune tasks stealing algorithm under back pressure.
344 ## [2.6.35] - 2023-08-25
348 - Don't account worker usage statistics for tasks that have failed.
349 - Fix pool information runtime and wait time median computation.
353 - Update simple moving average implementation to use a circular buffer.
354 - Update simple moving median implementation to use a circular buffer.
355 - Account for stolen tasks in worker usage statistics and pool information.
359 - Continuous tasks stealing algorithm.
361 ## [2.6.34] - 2023-08-24
365 - Avoid cascading tasks stealing under back pressure.
369 - Add fastpath to queued tasks rescheduling.
371 ## [2.6.33] - 2023-08-24
375 - Fix queued tasks rescheduling.
379 - Rename tasks queue options `queueMaxSize` to `size`.
383 - Task stealing scheduling algorithm if tasks queueing is enabled.
385 ## [2.6.32] - 2023-08-23
389 - Ensure no task can be executed when the pool is destroyed.
393 - Add `queueMaxSize` option to tasks queue options.
394 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
395 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
397 ## [2.6.31] - 2023-08-20
401 - Fix worker choice strategy retries mechanism in some edge cases.
405 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
406 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
408 ## [2.6.30] - 2023-08-19
412 - Ensure pool event `backPressure` is emitted.
413 - Ensure pool event `full` is emitted only once.
414 - Ensure worker node cannot be instantiated without proper arguments.
416 ## [2.6.29] - 2023-08-18
420 - Fix race condition between readiness and task functions worker message handling at startup.
421 - Fix duplicate task function worker usage statistics computation per task function.
422 - Update task function worker usage statistics if and only if there's at least two different task functions.
423 - Fix race condition at task function worker usage executing task computation leading to negative value.
427 - 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).
428 - Use back pressure detection in worker choice strategies.
429 - Add worker choice strategies retries mechanism if no worker is eligible.
431 ## [2.6.28] - 2023-08-16
435 - Ensure pool workers are properly initialized.
439 - HTTP server pool examples: express-cluster, express-hybrid.
443 - Remove now useless branching in worker hot code path.
445 ## [2.6.27] - 2023-08-15
449 - Add `KillHandler` type definition to exported types.
453 - Add `destroy` event to pool API.
455 ## [2.6.26] - 2023-08-15
459 - Add kill handler to worker options allowing to execute custom code when worker is killed.
460 - Add `listTaskFunctions()` method to pool API.
461 - SMTP client pool example: nodemailer.
463 ## [2.6.25] - 2023-08-13
467 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
468 - WebSocket server pool examples: ws-cluster, ws-hybrid.
470 ## [2.6.24] - 2023-08-12
474 - Add array of transferable objects to the `execute()` method arguments.
475 - WebSocket server pool examples: ws-worker_threads.
477 ## [2.6.23] - 2023-08-11
481 - 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.
485 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
486 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
488 ## [2.6.22] - 2023-08-10
492 - Add missing `types` field to package.json `exports`.
496 - Structure markdown documentation (PR #811).
498 ## [2.6.21] - 2023-08-03
502 - Improve code documentation.
503 - Code refactoring and cleanup for better maintainability and readability.
505 ## [2.6.20] - 2023-07-21
509 - Fix queued tasks redistribution on error task execution starvation.
510 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
514 - Drastically reduce lookups by worker in the worker nodes.
516 ## [2.6.19] - 2023-07-20
520 - Dedicated internal communication channel for worker_threads pools.
522 ## [2.6.18] - 2023-07-19
526 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
528 ## [2.6.17] - 2023-07-16
532 - Add `listTaskFunctions()` method to worker API.
534 ## [2.6.16] - 2023-07-12
538 - Fix pool startup detection.
539 - Fix worker task functions handling.
541 ## [2.6.15] - 2023-07-11
545 - Take into account worker node readiness in worker choice strategies.
547 ## [2.6.14] - 2023-07-10
551 - Fix task function statistics tracking.
553 ## [2.6.13] - 2023-07-10
557 - Add per task function statistics tracking.
558 - Add public methods to manipulate the worker task functions at runtime.
560 ## [2.6.12] - 2023-07-09
564 - Workaround import issue with `node:os` module in node 16.x.x.
566 ## [2.6.11] - 2023-07-09
570 - Fix pool readiness semantic.
572 ## [2.6.10] - 2023-07-08
576 - Ensure workers are not recreated on error at pool startup.
580 - Add `ready` and `strategy` fields to pool information.
581 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
582 - Add dynamic pool sizing checks.
584 ## [2.6.9] - 2023-07-07
588 - Recreate the right worker type on uncaught exception.
592 - Add minimum and maximum to internal measurement statistics.
593 - Add `runTime` and `waitTime` to pool information.
594 - Check worker inactive time only on dynamic worker.
596 ## [2.6.8] - 2023-07-03
600 - Brown paper bag release to fix version handling in pool information.
602 ## [2.6.7] - 2023-07-03
606 - Ensure worker queued tasks at error are reassigned to other pool workers.
610 - Add pool `utilization` ratio to pool information.
611 - Add `version` to pool information.
612 - Add worker information to worker nodes.
614 ## [2.6.6] - 2023-07-01
618 - Add safe helper `availableParallelism()` to help sizing the pool.
622 - Ensure message handler is only registered in worker.
624 ## [2.6.5] - 2023-06-27
628 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
632 - Artificial version bump to 2.6.5 to workaround publication issue.
633 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
634 - Ensure pool event is emitted before task error promise rejection.
635 - Fix queued tasks count computation.
639 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
641 ## [2.6.4] - 2023-06-27
645 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
649 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
650 - Ensure pool event is emitted before task error promise rejection.
651 - Fix queued tasks count computation.
655 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
657 ## [2.6.3] - 2023-06-19
661 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
662 - Update strategies internals after statistics computation.
666 - Optimize O(1) queue implementation.
668 ## [2.6.2] - 2023-06-12
672 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
674 ## [2.6.1] - 2023-06-10
678 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
682 - Fix average statistics computation: ensure failed tasks are not accounted.
684 ## [2.6.0] - 2023-06-09
688 - Add `LEAST_ELU` worker choice strategy (experimental).
689 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
693 - Refactor pool worker node usage internals.
694 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
695 - Breaking change: pool information `info` property object fields have been renamed.
699 - Fix wait time accounting.
700 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
701 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
703 ## [2.5.4] - 2023-06-07
707 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
711 - Compute statistics at the worker level only if needed.
712 - Add `worker_threads` options to thread pool options.
716 - Make the `LEAST_BUSY` strategy only relies on task runtime.
718 ## [2.5.3] - 2023-06-04
722 - Refine pool information content.
723 - Limit pool internals public exposure.
725 ## [2.5.2] - 2023-06-02
729 - Add `taskError` pool event for task execution error.
730 - Add pool information `info` property to pool.
731 - Emit pool information on `busy` and `full` pool events.
733 ## [2.5.1] - 2023-06-01
737 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
738 - Add `error` pool event for uncaught worker error.
740 ## [2.5.0] - 2023-05-31
744 - Switch pool event emitter to `EventEmitterAsyncResource`.
745 - Add tasks wait time accounting in per worker tasks usage.
746 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
750 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
752 ## [2.4.14] - 2023-05-09
756 - Ensure no undefined task runtime can land in the tasks history.
757 - Fix median computation implementation once again.
761 - Unit tests for median and queue implementations.
763 ## [2.4.13] - 2023-05-08
767 - Fix worker choice strategy options validation.
768 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
770 ## [2.4.12] - 2023-05-06
774 - Support multiple task functions per worker.
775 - Add custom worker weights support to worker choice strategies options.
779 - Use O(1) queue implementation for tasks queueing.
783 - Fix median computation implementation.
784 - Fix fair share worker choice strategy internals update.
786 ## [2.4.11] - 2023-04-23
790 - Optimize free worker finding in worker choice strategies.
792 ## [2.4.10] - 2023-04-15
796 - Fix typescript type definition for task function: ensure the input data is optional.
797 - Fix typescript type definition for pool execute(): ensure the input data is optional.
799 ## [2.4.9] - 2023-04-15
803 - Add tasks queue enablement runtime setter to pool.
804 - Add tasks queue options runtime setter to pool.
805 - Add worker choice strategy options runtime setter to pool.
809 - Remove the tasks queuing experimental status.
813 - Fix task function type definition and validation.
814 - Fix worker choice strategy options handling.
816 ## [2.4.8] - 2023-04-12
820 - Fix message between main worker and worker type definition for tasks.
821 - Fix code documentation.
823 ## [2.4.7] - 2023-04-11
827 - Add worker tasks queue options to pool options.
831 - Fix missing documentation.
833 ## [2.4.6] - 2023-04-10
837 - Ensure one task at a time is executed per worker with tasks queueing enabled.
838 - Properly count worker executing tasks with tasks queueing enabled.
840 ## [2.4.5] - 2023-04-09
844 - Use monotonic high resolution timer for worker tasks runtime.
845 - Add worker tasks median runtime to statistics.
846 - Add worker tasks queue (experimental).
848 ## [2.4.4] - 2023-04-07
852 - Add `PoolEvents` enumeration and `PoolEvent` type.
856 - Destroy worker only on alive check.
858 ## [2.4.3] - 2023-04-07
862 - Fix typedoc generation with inheritance.
864 ## [2.4.2] - 2023-04-06
868 - Add `full` event to dynamic pool.
869 - Keep worker choice strategy in memory for conditional reuse.
873 - Fix possible negative worker key at worker removal in worker choice strategies.
875 ## [2.4.1] - 2023-04-05
879 - Optimize worker choice strategy for dynamic pool.
883 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
885 ## [2.4.0] - 2023-04-04
889 - Add `LESS_BUSY` worker choice strategy.
893 - Optimize worker storage in pool.
894 - Optimize worker alive status check.
895 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
896 - Optimize `LESS_USED` worker choice strategy.
897 - Update benchmark versus external threads pools.
898 - Optimize tasks usage statistics requirements for worker choice strategy.
902 - Ensure trimmable characters are checked at pool initialization.
903 - Fix message id integer overflow.
904 - Fix pool worker removal in worker choice strategy internals.
905 - Fix package publication with pnpm.
907 ## [2.4.0-3] - 2023-04-04
911 - Add `LESS_BUSY` worker choice strategy.
915 - Optimize worker storage in pool.
916 - Optimize worker alive status check.
917 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
918 - Optimize `LESS_USED` worker choice strategy.
919 - Update benchmark versus external threads pools.
923 - Ensure trimmable characters are checked at pool initialization.
924 - Fix message id integer overflow.
925 - Fix pool worker removal in worker choice strategy internals.
926 - Fix package publication with pnpm.
928 ## [2.4.0-2] - 2023-04-03
932 - Add `LESS_BUSY` worker choice strategy.
936 - Optimize worker storage in pool.
937 - Optimize worker alive status check.
938 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
939 - Optimize `LESS_USED` worker choice strategy.
943 - Ensure trimmable characters are checked at pool initialization.
944 - Fix message id integer overflow.
945 - Fix pool worker removal in worker choice strategy internals.
946 - Fix package publication with pnpm.
948 ## [2.4.0-1] - 2023-04-03
952 - Add `LESS_BUSY` worker choice strategy.
956 - Optimize worker storage in pool.
957 - Optimize worker alive status check.
958 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
959 - Optimize `LESS_USED` worker choice strategy.
963 - Ensure trimmable characters are checked at pool initialization.
964 - Fix message id integer overflow.
965 - Fix pool worker removal in worker choice strategy internals.
967 ## [2.4.0-0] - 2023-04-03
971 - Add `LESS_BUSY` worker choice strategy.
975 - Optimize worker storage in pool.
976 - Optimize worker alive status check.
977 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
978 - Optimize `LESS_USED` worker choice strategy.
982 - Ensure trimmable characters are checked at pool initialization.
983 - Fix message id integer overflow.
984 - Fix pool worker removal in worker choice strategy internals.
986 ## [2.3.10] - 2023-03-18
990 - Fix package.json `exports` syntax for ESM and CommonJS.
994 - Permit SemVer pre-release publication.
996 ## [2.3.10-2] - 2023-03-18
1000 - Fix package.json `exports` syntax for ESM and CommonJS.
1002 ## [2.3.10-1] - 2023-03-18
1006 - Permit SemVer pre-release publication.
1008 ## [2.3.10-0] - 2023-03-18
1012 - Fix package.json `exports` syntax for ESM and CommonJS.
1014 ## [2.3.9] - 2023-03-18
1018 - Introduce ESM module support along with CommonJS one.
1022 - Fix brown paper bag bug referencing the same object literal.
1024 ## [2.3.8] - 2023-03-18
1028 - Switch internal benchmarking code to benny.
1029 - Switch to TypeScript 5.x.x.
1030 - Switch rollup bundler plugins to core ones.
1031 - Switch to TSDoc syntax.
1032 - Enforce conventional commits.
1036 - Fix random integer generator.
1037 - Fix worker choice strategy pool type identification at initialization.
1039 ## [2.3.7] - 2022-10-23
1043 - Switch to open collective FOSS project funding platform.
1044 - Switch to ts-standard linter configuration on TypeScript code.
1048 - Fixed missing async on pool execute method.
1049 - Fixed typing in TypeScript example.
1050 - Fixed types in unit tests.
1052 ## [2.3.6] - 2022-10-22
1056 - Cleanup pool attributes and methods.
1057 - Refine error types thrown.
1061 - Fix continuous integration build on windows.
1062 - Fix code coverage reporting by using c8 instead of nyc.
1064 ## [2.3.5] - 2022-10-21
1068 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1069 - Optimize tasks usage lookup implementation.
1073 - Fix missed pool event emitter type export.
1074 - Fix typedoc documentation generation.
1076 ## [2.3.4] - 2022-10-17
1080 - Fully automate release process with release-it.
1084 - Optimize fair share task scheduling algorithm implementation.
1085 - Update benchmark versus external pools results with latest version.
1087 ## [2.3.3] - 2022-10-15
1091 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1093 ## [2.3.2] - 2022-10-14
1097 - Optimize fair share worker selection strategy implementation.
1101 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1103 ## [2.3.1] - 2022-10-13
1107 - Pool worker choice strategies:
1108 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1109 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1111 ## [2.2.2] - 2022-10-09
1115 - Fixed `README.md` file.
1117 ## [2.2.1] - 2022-10-08
1121 - Dynamic worker choice strategy change at runtime.
1123 ## [2.2.0] - 2022-01-05
1125 ### Breaking Changes
1127 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1129 ## [2.1.0] - 2021-08-29
1133 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1135 ### Breaking Changes
1137 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1138 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1139 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1140 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1142 ## [2.0.2] - 2021-05-12
1146 - Fix `busy` event emission on fixed pool type
1148 ## [2.0.1] - 2021-03-16
1152 - Check if pool options are properly set.
1153 - `busy` event is emitted on all pool types.
1155 ## [2.0.0] - 2021-03-01
1159 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1161 ### Breaking Changes
1163 - `FullPool` event is now renamed to `busy`.
1164 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1165 _Find more details on our JSDoc._
1167 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1169 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1171 ### Pool options types declaration merge
1173 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1175 #### New `export` strategy
1179 const DynamicThreadPool = require('poolifier/lib/dynamic')
1181 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1184 But you should always prefer just using
1187 const { DynamicThreadPool } = require('poolifier')
1190 #### New type definitions for input data and response
1192 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1193 _This is not a limitation by poolifier but Node.js._
1195 #### Public property replacements
1197 `numWorkers` property is now `numberOfWorkers`
1199 #### Internal (protected) properties and methods renaming
1201 These properties are not intended for end users
1203 - `id` => `nextMessageId`
1205 These methods are not intended for end users
1207 - `_chooseWorker` => `chooseWorker`
1208 - `_newWorker` => `createWorker`
1209 - `_execute` => `internalExecute`
1210 - `_chooseWorker` => `chooseWorker`
1211 - `_checkAlive` => `checkAlive`
1213 - `_runAsync` => `runAsync`
1215 ## [1.1.0] - 2020-05-21
1219 - ThreadWorker support async functions as option
1220 - Various external library patches
1222 ## [1.0.0] - 2020-01-24
1226 - FixedThreadPool implementation
1227 - DynamicThreadPool implementation
1228 - WorkerThread implementation to improve developer experience