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 ## [3.1.8] - 2023-12-21
14 - Fix default worker weight computation.
15 - Fix possible null exception at pool destroying.
17 ## [3.1.7] - 2023-12-20
21 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
23 ## [3.1.6] - 2023-12-18
27 - Fix pool destroying with tasks queuing enabled.
29 ## [3.1.5] - 2023-12-18
33 - Add queued tasks end timeout support to worker node termination.
35 ## [3.1.4] - 2023-12-18
39 - Make more robust the fix for possible null exception at handling task execution response.
41 ## [3.1.3] - 2023-12-17
45 - Fix possible null exception at handling task execution response.
47 ## [3.1.2] - 2023-12-17
51 - Wait for queued tasks to end at worker node termination.
53 ## [3.1.1] - 2023-12-16
57 - Fix pool options TS type definition.
59 ## [3.1.0] - 2023-12-16
63 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
65 ## [3.0.14] - 2023-12-13
69 - Fix possible null exception with worker_threads pools.
71 ## [3.0.13] - 2023-12-12
75 - Ensure worker choice strategy wait for worker nodes readiness.
79 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
81 ## [3.0.12] - 2023-12-12
85 - Add infinite retries support in worker choice strategy.
87 ## [3.0.11] - 2023-12-11
91 - Ensure pool asynchronous resource properly track tasks execution.
93 ## [3.0.10] - 2023-12-08
97 - Add a fastpath when tasks stealing or redistribution is impossible.
99 ## [3.0.9] - 2023-11-26
103 - Remove all pool events listener at pool destroying.
104 - Remove all worker node events listener at worker node destroying.
105 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
107 ## [3.0.8] - 2023-11-25
111 - Ensure continuous tasks stealing on idle start at worker node idling.
113 ## [3.0.7] - 2023-11-24
117 - Make continuous tasks stealing start at worker node idling.
119 ## [3.0.6] - 2023-11-24
123 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
124 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
126 ## [3.0.5] - 2023-10-27
130 - Ensure pool `ready` event can be emitted only once.
132 ## [3.0.4] - 2023-10-20
136 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
137 - Use builtin retry mechanism in worker choice strategies instead of custom one.
139 ## [3.0.3] - 2023-10-19
143 - Avoid null exception at sending message to worker.
144 - Avoid null exception at checking worker node readiness.
146 ## [3.0.2] - 2023-10-17
150 - 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).
152 ## [3.0.1] - 2023-10-16
156 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
160 - Switch the worker node eventing code to `EventTarget` API.
162 ## [3.0.0] - 2023-10-08
166 - Remove Node.js 16.x.x (EOL) support.
168 ## [2.7.5] - 2023-10-03
172 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
174 ## [2.7.4] - 2023-09-25
178 - Fix source maps (bundler issue).
180 ## [2.7.3] - 2023-09-24
184 - Convert pool event emitter to event emitter async resource.
186 ## [2.7.2] - 2023-09-23
190 - Add source maps to npm package to ease debugging.
194 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
196 ## [2.7.1] - 2023-09-20
200 - Ensure worker message listener used one time are removed after usage.
202 ## [2.7.0] - 2023-09-19
206 - Fix task stealing related tasks queue options handling at runtime.
210 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
214 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
215 - Stricter worker constructor arguments validation.
217 ## [2.6.45] - 2023-09-17
221 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
225 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
226 - Add `start()` method to pool API to start the minimum number of workers.
227 - 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.
228 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
230 ## [2.6.44] - 2023-09-08
234 - Use a dedicated PAT to publish on GitHub packages registry.
238 - Publish on GitHub packages registry on release.
242 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
244 ## [2.6.43] - 2023-09-08
248 - Publish on GitHub packages registry on release.
252 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
254 ## [2.6.42] - 2023-09-06
258 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
260 ## [2.6.41] - 2023-09-03
264 - Optimize worker choice strategies implementation.
266 ## [2.6.40] - 2023-09-01
270 - Do not pre-choose in WRR worker choice strategy to avoid bias.
271 - Avoid array out of bound in worker choice strategies after worker node removal.
273 ## [2.6.39] - 2023-08-30
277 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
279 ## [2.6.38] - 2023-08-30
283 - Bundle typescript types declaration into one file.
287 - Improve interleaved weighted round robin worker choice strategy implementation.
289 ## [2.6.37] - 2023-08-28
293 - Ensure unused worker usage statistics are deleted at runtime.
297 - Rename worker choice strategy options `choiceRetries` to `retries`.
298 - Avoid unnecessary branching in worker choice strategies.
300 ## [2.6.36] - 2023-08-27
304 - Fix pool `execute()` arguments check.
308 - Make continuous tasks stealing algorithm less aggressive.
309 - Fine tune tasks stealing algorithm under back pressure.
311 ## [2.6.35] - 2023-08-25
315 - Don't account worker usage statistics for tasks that have failed.
316 - Fix pool information runtime and wait time median computation.
320 - Update simple moving average implementation to use a circular buffer.
321 - Update simple moving median implementation to use a circular buffer.
322 - Account for stolen tasks in worker usage statistics and pool information.
326 - Continuous tasks stealing algorithm.
328 ## [2.6.34] - 2023-08-24
332 - Avoid cascading tasks stealing under back pressure.
336 - Add fastpath to queued tasks rescheduling.
338 ## [2.6.33] - 2023-08-24
342 - Fix queued tasks rescheduling.
346 - Rename tasks queue options `queueMaxSize` to `size`.
350 - Task stealing scheduling algorithm if tasks queueing is enabled.
352 ## [2.6.32] - 2023-08-23
356 - Ensure no task can be executed when the pool is destroyed.
360 - Add `queueMaxSize` option to tasks queue options.
361 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
362 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
364 ## [2.6.31] - 2023-08-20
368 - Fix worker choice strategy retries mechanism in some edge cases.
372 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
373 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
375 ## [2.6.30] - 2023-08-19
379 - Ensure pool event `backPressure` is emitted.
380 - Ensure pool event `full` is emitted only once.
381 - Ensure worker node cannot be instantiated without proper arguments.
383 ## [2.6.29] - 2023-08-18
387 - Fix race condition between readiness and task functions worker message handling at startup.
388 - Fix duplicate task function worker usage statistics computation per task function.
389 - Update task function worker usage statistics if and only if there's at least two different task functions.
390 - Fix race condition at task function worker usage executing task computation leading to negative value.
394 - 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).
395 - Use back pressure detection in worker choice strategies.
396 - Add worker choice strategies retries mechanism if no worker is eligible.
398 ## [2.6.28] - 2023-08-16
402 - Ensure pool workers are properly initialized.
406 - HTTP server pool examples: express-cluster, express-hybrid.
410 - Remove now useless branching in worker hot code path.
412 ## [2.6.27] - 2023-08-15
416 - Add `KillHandler` type definition to exported types.
420 - Add `destroy` event to pool API.
422 ## [2.6.26] - 2023-08-15
426 - Add kill handler to worker options allowing to execute custom code when worker is killed.
427 - Add `listTaskFunctions()` method to pool API.
428 - SMTP client pool example: nodemailer.
430 ## [2.6.25] - 2023-08-13
434 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
435 - WebSocket server pool examples: ws-cluster, ws-hybrid.
437 ## [2.6.24] - 2023-08-12
441 - Add array of transferable objects to the `execute()` method arguments.
442 - WebSocket server pool examples: ws-worker_threads.
444 ## [2.6.23] - 2023-08-11
448 - 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.
452 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
453 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
455 ## [2.6.22] - 2023-08-10
459 - Add missing `types` field to package.json `exports`.
463 - Structure markdown documentation (PR #811).
465 ## [2.6.21] - 2023-08-03
469 - Improve code documentation.
470 - Code refactoring and cleanup for better maintainability and readability.
472 ## [2.6.20] - 2023-07-21
476 - Fix queued tasks redistribution on error task execution starvation.
477 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
481 - Drastically reduce lookups by worker in the worker nodes.
483 ## [2.6.19] - 2023-07-20
487 - Dedicated internal communication channel for worker_threads pools.
489 ## [2.6.18] - 2023-07-19
493 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
495 ## [2.6.17] - 2023-07-16
499 - Add `listTaskFunctions()` method to worker API.
501 ## [2.6.16] - 2023-07-12
505 - Fix pool startup detection.
506 - Fix worker task functions handling.
508 ## [2.6.15] - 2023-07-11
512 - Take into account worker node readiness in worker choice strategies.
514 ## [2.6.14] - 2023-07-10
518 - Fix task function statistics tracking.
520 ## [2.6.13] - 2023-07-10
524 - Add per task function statistics tracking.
525 - Add public methods to manipulate the worker task functions at runtime.
527 ## [2.6.12] - 2023-07-09
531 - Workaround import issue with `node:os` module in node 16.x.x.
533 ## [2.6.11] - 2023-07-09
537 - Fix pool readiness semantic.
539 ## [2.6.10] - 2023-07-08
543 - Ensure workers are not recreated on error at pool startup.
547 - Add `ready` and `strategy` fields to pool information.
548 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
549 - Add dynamic pool sizing checks.
551 ## [2.6.9] - 2023-07-07
555 - Recreate the right worker type on uncaught exception.
559 - Add minimum and maximum to internal measurement statistics.
560 - Add `runTime` and `waitTime` to pool information.
561 - Check worker inactive time only on dynamic worker.
563 ## [2.6.8] - 2023-07-03
567 - Brown paper bag release to fix version handling in pool information.
569 ## [2.6.7] - 2023-07-03
573 - Ensure worker queued tasks at error are reassigned to other pool workers.
577 - Add pool `utilization` ratio to pool information.
578 - Add `version` to pool information.
579 - Add worker information to worker nodes.
581 ## [2.6.6] - 2023-07-01
585 - Add safe helper `availableParallelism()` to help sizing the pool.
589 - Ensure message handler is only registered in worker.
591 ## [2.6.5] - 2023-06-27
595 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
599 - Artificial version bump to 2.6.5 to workaround publication issue.
600 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
601 - Ensure pool event is emitted before task error promise rejection.
602 - Fix queued tasks count computation.
606 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
608 ## [2.6.4] - 2023-06-27
612 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
616 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
617 - Ensure pool event is emitted before task error promise rejection.
618 - Fix queued tasks count computation.
622 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
624 ## [2.6.3] - 2023-06-19
628 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
629 - Update strategies internals after statistics computation.
633 - Optimize O(1) queue implementation.
635 ## [2.6.2] - 2023-06-12
639 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
641 ## [2.6.1] - 2023-06-10
645 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
649 - Fix average statistics computation: ensure failed tasks are not accounted.
651 ## [2.6.0] - 2023-06-09
655 - Add `LEAST_ELU` worker choice strategy (experimental).
656 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
660 - Refactor pool worker node usage internals.
661 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
662 - Breaking change: pool information `info` property object fields have been renamed.
666 - Fix wait time accounting.
667 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
668 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
670 ## [2.5.4] - 2023-06-07
674 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
678 - Compute statistics at the worker level only if needed.
679 - Add `worker_threads` options to thread pool options.
683 - Make the `LEAST_BUSY` strategy only relies on task runtime.
685 ## [2.5.3] - 2023-06-04
689 - Refine pool information content.
690 - Limit pool internals public exposure.
692 ## [2.5.2] - 2023-06-02
696 - Add `taskError` pool event for task execution error.
697 - Add pool information `info` property to pool.
698 - Emit pool information on `busy` and `full` pool events.
700 ## [2.5.1] - 2023-06-01
704 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
705 - Add `error` pool event for uncaught worker error.
707 ## [2.5.0] - 2023-05-31
711 - Switch pool event emitter to `EventEmitterAsyncResource`.
712 - Add tasks wait time accounting in per worker tasks usage.
713 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
717 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
719 ## [2.4.14] - 2023-05-09
723 - Ensure no undefined task runtime can land in the tasks history.
724 - Fix median computation implementation once again.
728 - Unit tests for median and queue implementations.
730 ## [2.4.13] - 2023-05-08
734 - Fix worker choice strategy options validation.
735 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
737 ## [2.4.12] - 2023-05-06
741 - Support multiple task functions per worker.
742 - Add custom worker weights support to worker choice strategies options.
746 - Use O(1) queue implementation for tasks queueing.
750 - Fix median computation implementation.
751 - Fix fair share worker choice strategy internals update.
753 ## [2.4.11] - 2023-04-23
757 - Optimize free worker finding in worker choice strategies.
759 ## [2.4.10] - 2023-04-15
763 - Fix typescript type definition for task function: ensure the input data is optional.
764 - Fix typescript type definition for pool execute(): ensure the input data is optional.
766 ## [2.4.9] - 2023-04-15
770 - Add tasks queue enablement runtime setter to pool.
771 - Add tasks queue options runtime setter to pool.
772 - Add worker choice strategy options runtime setter to pool.
776 - Remove the tasks queuing experimental status.
780 - Fix task function type definition and validation.
781 - Fix worker choice strategy options handling.
783 ## [2.4.8] - 2023-04-12
787 - Fix message between main worker and worker type definition for tasks.
788 - Fix code documentation.
790 ## [2.4.7] - 2023-04-11
794 - Add worker tasks queue options to pool options.
798 - Fix missing documentation.
800 ## [2.4.6] - 2023-04-10
804 - Ensure one task at a time is executed per worker with tasks queueing enabled.
805 - Properly count worker executing tasks with tasks queueing enabled.
807 ## [2.4.5] - 2023-04-09
811 - Use monotonic high resolution timer for worker tasks runtime.
812 - Add worker tasks median runtime to statistics.
813 - Add worker tasks queue (experimental).
815 ## [2.4.4] - 2023-04-07
819 - Add `PoolEvents` enumeration and `PoolEvent` type.
823 - Destroy worker only on alive check.
825 ## [2.4.3] - 2023-04-07
829 - Fix typedoc generation with inheritance.
831 ## [2.4.2] - 2023-04-06
835 - Add `full` event to dynamic pool.
836 - Keep worker choice strategy in memory for conditional reuse.
840 - Fix possible negative worker key at worker removal in worker choice strategies.
842 ## [2.4.1] - 2023-04-05
846 - Optimize worker choice strategy for dynamic pool.
850 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
852 ## [2.4.0] - 2023-04-04
856 - Add `LESS_BUSY` worker choice strategy.
860 - Optimize worker storage in pool.
861 - Optimize worker alive status check.
862 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
863 - Optimize `LESS_USED` worker choice strategy.
864 - Update benchmark versus external threads pools.
865 - Optimize tasks usage statistics requirements for worker choice strategy.
869 - Ensure trimmable characters are checked at pool initialization.
870 - Fix message id integer overflow.
871 - Fix pool worker removal in worker choice strategy internals.
872 - Fix package publication with pnpm.
874 ## [2.4.0-3] - 2023-04-04
878 - Add `LESS_BUSY` worker choice strategy.
882 - Optimize worker storage in pool.
883 - Optimize worker alive status check.
884 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
885 - Optimize `LESS_USED` worker choice strategy.
886 - Update benchmark versus external threads pools.
890 - Ensure trimmable characters are checked at pool initialization.
891 - Fix message id integer overflow.
892 - Fix pool worker removal in worker choice strategy internals.
893 - Fix package publication with pnpm.
895 ## [2.4.0-2] - 2023-04-03
899 - Add `LESS_BUSY` worker choice strategy.
903 - Optimize worker storage in pool.
904 - Optimize worker alive status check.
905 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
906 - Optimize `LESS_USED` worker choice strategy.
910 - Ensure trimmable characters are checked at pool initialization.
911 - Fix message id integer overflow.
912 - Fix pool worker removal in worker choice strategy internals.
913 - Fix package publication with pnpm.
915 ## [2.4.0-1] - 2023-04-03
919 - Add `LESS_BUSY` worker choice strategy.
923 - Optimize worker storage in pool.
924 - Optimize worker alive status check.
925 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
926 - Optimize `LESS_USED` worker choice strategy.
930 - Ensure trimmable characters are checked at pool initialization.
931 - Fix message id integer overflow.
932 - Fix pool worker removal in worker choice strategy internals.
934 ## [2.4.0-0] - 2023-04-03
938 - Add `LESS_BUSY` worker choice strategy.
942 - Optimize worker storage in pool.
943 - Optimize worker alive status check.
944 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
945 - Optimize `LESS_USED` worker choice strategy.
949 - Ensure trimmable characters are checked at pool initialization.
950 - Fix message id integer overflow.
951 - Fix pool worker removal in worker choice strategy internals.
953 ## [2.3.10] - 2023-03-18
957 - Fix package.json `exports` syntax for ESM and CommonJS.
961 - Permit SemVer pre-release publication.
963 ## [2.3.10-2] - 2023-03-18
967 - Fix package.json `exports` syntax for ESM and CommonJS.
969 ## [2.3.10-1] - 2023-03-18
973 - Permit SemVer pre-release publication.
975 ## [2.3.10-0] - 2023-03-18
979 - Fix package.json `exports` syntax for ESM and CommonJS.
981 ## [2.3.9] - 2023-03-18
985 - Introduce ESM module support along with CommonJS one.
989 - Fix brown paper bag bug referencing the same object literal.
991 ## [2.3.8] - 2023-03-18
995 - Switch internal benchmarking code to benny.
996 - Switch to TypeScript 5.x.x.
997 - Switch rollup bundler plugins to core ones.
998 - Switch to TSDoc syntax.
999 - Enforce conventional commits.
1003 - Fix random integer generator.
1004 - Fix worker choice strategy pool type identification at initialization.
1006 ## [2.3.7] - 2022-10-23
1010 - Switch to open collective FOSS project funding platform.
1011 - Switch to ts-standard linter configuration on TypeScript code.
1015 - Fixed missing async on pool execute method.
1016 - Fixed typing in TypeScript example.
1017 - Fixed types in unit tests.
1019 ## [2.3.6] - 2022-10-22
1023 - Cleanup pool attributes and methods.
1024 - Refine error types thrown.
1028 - Fix continuous integration build on windows.
1029 - Fix code coverage reporting by using c8 instead of nyc.
1031 ## [2.3.5] - 2022-10-21
1035 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1036 - Optimize tasks usage lookup implementation.
1040 - Fix missed pool event emitter type export.
1041 - Fix typedoc documentation generation.
1043 ## [2.3.4] - 2022-10-17
1047 - Fully automate release process with release-it.
1051 - Optimize fair share task scheduling algorithm implementation.
1052 - Update benchmark versus external pools results with latest version.
1054 ## [2.3.3] - 2022-10-15
1058 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1060 ## [2.3.2] - 2022-10-14
1064 - Optimize fair share worker selection strategy implementation.
1068 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1070 ## [2.3.1] - 2022-10-13
1074 - Pool worker choice strategies:
1075 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1076 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1078 ## [2.2.2] - 2022-10-09
1082 - Fixed `README.md` file.
1084 ## [2.2.1] - 2022-10-08
1088 - Dynamic worker choice strategy change at runtime.
1090 ## [2.2.0] - 2022-01-05
1092 ### Breaking Changes
1094 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1096 ## [2.1.0] - 2021-08-29
1100 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1102 ### Breaking Changes
1104 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1105 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1106 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1107 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1109 ## [2.0.2] - 2021-05-12
1113 - Fix `busy` event emission on fixed pool type
1115 ## [2.0.1] - 2021-03-16
1119 - Check if pool options are properly set.
1120 - `busy` event is emitted on all pool types.
1122 ## [2.0.0] - 2021-03-01
1126 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1128 ### Breaking Changes
1130 - `FullPool` event is now renamed to `busy`.
1131 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1132 _Find more details on our JSDoc._
1134 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1136 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1138 ### Pool options types declaration merge
1140 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1142 #### New `export` strategy
1146 const DynamicThreadPool = require('poolifier/lib/dynamic')
1148 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1151 But you should always prefer just using
1154 const { DynamicThreadPool } = require('poolifier')
1157 #### New type definitions for input data and response
1159 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1160 _This is not a limitation by poolifier but Node.js._
1162 #### Public property replacements
1164 `numWorkers` property is now `numberOfWorkers`
1166 #### Internal (protected) properties and methods renaming
1168 These properties are not intended for end users
1170 - `id` => `nextMessageId`
1172 These methods are not intended for end users
1174 - `_chooseWorker` => `chooseWorker`
1175 - `_newWorker` => `createWorker`
1176 - `_execute` => `internalExecute`
1177 - `_chooseWorker` => `chooseWorker`
1178 - `_checkAlive` => `checkAlive`
1180 - `_runAsync` => `runAsync`
1182 ## [1.1.0] - 2020-05-21
1186 - ThreadWorker support async functions as option
1187 - Various external library patches
1189 ## [1.0.0] - 2020-01-24
1193 - FixedThreadPool implementation
1194 - DynamicThreadPool implementation
1195 - WorkerThread implementation to improve developer experience