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 ## [3.1.4] - 2023-12-18
14 - Make more robust the fix for possible null exception at handling task execution response.
16 ## [3.1.3] - 2023-12-17
20 - Fix possible null exception at handling task execution response.
22 ## [3.1.2] - 2023-12-17
26 - Wait for queued tasks to end at worker termination.
28 ## [3.1.1] - 2023-12-16
32 - Fix pool options TS type definition.
34 ## [3.1.0] - 2023-12-16
38 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
40 ## [3.0.14] - 2023-12-13
44 - Fix possible null exception with worker_threads pools.
46 ## [3.0.13] - 2023-12-12
50 - Ensure worker choice strategy wait for worker nodes readiness.
54 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
56 ## [3.0.12] - 2023-12-12
60 - Add infinite retries support in worker choice strategy.
62 ## [3.0.11] - 2023-12-11
66 - Ensure pool asynchronous resource properly track tasks execution.
68 ## [3.0.10] - 2023-12-08
72 - Add a fastpath when tasks stealing or redistribution is impossible.
74 ## [3.0.9] - 2023-11-26
78 - Remove all pool events listener at pool destroying.
79 - Remove all worker node events listener at worker node destroying.
80 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
82 ## [3.0.8] - 2023-11-25
86 - Ensure continuous tasks stealing on idle start at worker node idling.
88 ## [3.0.7] - 2023-11-24
92 - Make continuous tasks stealing start at worker node idling.
94 ## [3.0.6] - 2023-11-24
98 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
99 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
101 ## [3.0.5] - 2023-10-27
105 - Ensure pool `ready` event can be emitted only once.
107 ## [3.0.4] - 2023-10-20
111 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
112 - Use builtin retry mechanism in worker choice strategies instead of custom one.
114 ## [3.0.3] - 2023-10-19
118 - Avoid null exception at sending message to worker.
119 - Avoid null exception at checking worker node readiness.
121 ## [3.0.2] - 2023-10-17
125 - 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).
127 ## [3.0.1] - 2023-10-16
131 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
135 - Switch the worker node eventing code to `EventTarget` API.
137 ## [3.0.0] - 2023-10-08
141 - Remove Node.js 16.x.x (EOL) support.
143 ## [2.7.5] - 2023-10-03
147 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
149 ## [2.7.4] - 2023-09-25
153 - Fix source maps (bundler issue).
155 ## [2.7.3] - 2023-09-24
159 - Convert pool event emitter to event emitter async resource.
161 ## [2.7.2] - 2023-09-23
165 - Add source maps to npm package to ease debugging.
169 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
171 ## [2.7.1] - 2023-09-20
175 - Ensure worker message listener used one time are removed after usage.
177 ## [2.7.0] - 2023-09-19
181 - Fix task stealing related tasks queue options handling at runtime.
185 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
189 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
190 - Stricter worker constructor arguments validation.
192 ## [2.6.45] - 2023-09-17
196 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
200 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
201 - Add `start()` method to pool API to start the minimum number of workers.
202 - 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.
203 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
205 ## [2.6.44] - 2023-09-08
209 - Use a dedicated PAT to publish on GitHub packages registry.
213 - Publish on GitHub packages registry on release.
217 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
219 ## [2.6.43] - 2023-09-08
223 - Publish on GitHub packages registry on release.
227 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
229 ## [2.6.42] - 2023-09-06
233 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
235 ## [2.6.41] - 2023-09-03
239 - Optimize worker choice strategies implementation.
241 ## [2.6.40] - 2023-09-01
245 - Do not pre-choose in WRR worker choice strategy to avoid bias.
246 - Avoid array out of bound in worker choice strategies after worker node removal.
248 ## [2.6.39] - 2023-08-30
252 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
254 ## [2.6.38] - 2023-08-30
258 - Bundle typescript types declaration into one file.
262 - Improve interleaved weighted round robin worker choice strategy implementation.
264 ## [2.6.37] - 2023-08-28
268 - Ensure unused worker usage statistics are deleted at runtime.
272 - Rename worker choice strategy options `choiceRetries` to `retries`.
273 - Avoid unnecessary branching in worker choice strategies.
275 ## [2.6.36] - 2023-08-27
279 - Fix pool `execute()` arguments check.
283 - Make continuous tasks stealing algorithm less aggressive.
284 - Fine tune tasks stealing algorithm under back pressure.
286 ## [2.6.35] - 2023-08-25
290 - Don't account worker usage statistics for tasks that have failed.
291 - Fix pool information runtime and wait time median computation.
295 - Update simple moving average implementation to use a circular buffer.
296 - Update simple moving median implementation to use a circular buffer.
297 - Account for stolen tasks in worker usage statistics and pool information.
301 - Continuous tasks stealing algorithm.
303 ## [2.6.34] - 2023-08-24
307 - Avoid cascading tasks stealing under back pressure.
311 - Add fastpath to queued tasks rescheduling.
313 ## [2.6.33] - 2023-08-24
317 - Fix queued tasks rescheduling.
321 - Rename tasks queue options `queueMaxSize` to `size`.
325 - Task stealing scheduling algorithm if tasks queueing is enabled.
327 ## [2.6.32] - 2023-08-23
331 - Ensure no task can be executed when the pool is destroyed.
335 - Add `queueMaxSize` option to tasks queue options.
336 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
337 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
339 ## [2.6.31] - 2023-08-20
343 - Fix worker choice strategy retries mechanism in some edge cases.
347 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
348 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
350 ## [2.6.30] - 2023-08-19
354 - Ensure pool event `backPressure` is emitted.
355 - Ensure pool event `full` is emitted only once.
356 - Ensure worker node cannot be instantiated without proper arguments.
358 ## [2.6.29] - 2023-08-18
362 - Fix race condition between readiness and task functions worker message handling at startup.
363 - Fix duplicate task function worker usage statistics computation per task function.
364 - Update task function worker usage statistics if and only if there's at least two different task functions.
365 - Fix race condition at task function worker usage executing task computation leading to negative value.
369 - 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).
370 - Use back pressure detection in worker choice strategies.
371 - Add worker choice strategies retries mechanism if no worker is eligible.
373 ## [2.6.28] - 2023-08-16
377 - Ensure pool workers are properly initialized.
381 - HTTP server pool examples: express-cluster, express-hybrid.
385 - Remove now useless branching in worker hot code path.
387 ## [2.6.27] - 2023-08-15
391 - Add `KillHandler` type definition to exported types.
395 - Add `destroy` event to pool API.
397 ## [2.6.26] - 2023-08-15
401 - Add kill handler to worker options allowing to execute custom code when worker is killed.
402 - Add `listTaskFunctions()` method to pool API.
403 - SMTP client pool example: nodemailer.
405 ## [2.6.25] - 2023-08-13
409 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
410 - WebSocket server pool examples: ws-cluster, ws-hybrid.
412 ## [2.6.24] - 2023-08-12
416 - Add array of transferable objects to the `execute()` method arguments.
417 - WebSocket server pool examples: ws-worker_threads.
419 ## [2.6.23] - 2023-08-11
423 - 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.
427 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
428 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
430 ## [2.6.22] - 2023-08-10
434 - Add missing `types` field to package.json `exports`.
438 - Structure markdown documentation (PR #811).
440 ## [2.6.21] - 2023-08-03
444 - Improve code documentation.
445 - Code refactoring and cleanup for better maintainability and readability.
447 ## [2.6.20] - 2023-07-21
451 - Fix queued tasks redistribution on error task execution starvation.
452 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
456 - Drastically reduce lookups by worker in the worker nodes.
458 ## [2.6.19] - 2023-07-20
462 - Dedicated internal communication channel for worker_threads pools.
464 ## [2.6.18] - 2023-07-19
468 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
470 ## [2.6.17] - 2023-07-16
474 - Add `listTaskFunctions()` method to worker API.
476 ## [2.6.16] - 2023-07-12
480 - Fix pool startup detection.
481 - Fix worker task functions handling.
483 ## [2.6.15] - 2023-07-11
487 - Take into account worker node readiness in worker choice strategies.
489 ## [2.6.14] - 2023-07-10
493 - Fix task function statistics tracking.
495 ## [2.6.13] - 2023-07-10
499 - Add per task function statistics tracking.
500 - Add public methods to manipulate the worker task functions at runtime.
502 ## [2.6.12] - 2023-07-09
506 - Workaround import issue with `node:os` module in node 16.x.x.
508 ## [2.6.11] - 2023-07-09
512 - Fix pool readiness semantic.
514 ## [2.6.10] - 2023-07-08
518 - Ensure workers are not recreated on error at pool startup.
522 - Add `ready` and `strategy` fields to pool information.
523 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
524 - Add dynamic pool sizing checks.
526 ## [2.6.9] - 2023-07-07
530 - Recreate the right worker type on uncaught exception.
534 - Add minimum and maximum to internal measurement statistics.
535 - Add `runTime` and `waitTime` to pool information.
536 - Check worker inactive time only on dynamic worker.
538 ## [2.6.8] - 2023-07-03
542 - Brown paper bag release to fix version handling in pool information.
544 ## [2.6.7] - 2023-07-03
548 - Ensure worker queued tasks at error are reassigned to other pool workers.
552 - Add pool `utilization` ratio to pool information.
553 - Add `version` to pool information.
554 - Add worker information to worker nodes.
556 ## [2.6.6] - 2023-07-01
560 - Add safe helper `availableParallelism()` to help sizing the pool.
564 - Ensure message handler is only registered in worker.
566 ## [2.6.5] - 2023-06-27
570 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
574 - Artificial version bump to 2.6.5 to workaround publication issue.
575 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
576 - Ensure pool event is emitted before task error promise rejection.
577 - Fix queued tasks count computation.
581 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
583 ## [2.6.4] - 2023-06-27
587 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
591 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
592 - Ensure pool event is emitted before task error promise rejection.
593 - Fix queued tasks count computation.
597 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
599 ## [2.6.3] - 2023-06-19
603 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
604 - Update strategies internals after statistics computation.
608 - Optimize O(1) queue implementation.
610 ## [2.6.2] - 2023-06-12
614 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
616 ## [2.6.1] - 2023-06-10
620 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
624 - Fix average statistics computation: ensure failed tasks are not accounted.
626 ## [2.6.0] - 2023-06-09
630 - Add `LEAST_ELU` worker choice strategy (experimental).
631 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
635 - Refactor pool worker node usage internals.
636 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
637 - Breaking change: pool information `info` property object fields have been renamed.
641 - Fix wait time accounting.
642 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
643 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
645 ## [2.5.4] - 2023-06-07
649 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
653 - Compute statistics at the worker level only if needed.
654 - Add `worker_threads` options to thread pool options.
658 - Make the `LEAST_BUSY` strategy only relies on task runtime.
660 ## [2.5.3] - 2023-06-04
664 - Refine pool information content.
665 - Limit pool internals public exposure.
667 ## [2.5.2] - 2023-06-02
671 - Add `taskError` pool event for task execution error.
672 - Add pool information `info` property to pool.
673 - Emit pool information on `busy` and `full` pool events.
675 ## [2.5.1] - 2023-06-01
679 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
680 - Add `error` pool event for uncaught worker error.
682 ## [2.5.0] - 2023-05-31
686 - Switch pool event emitter to `EventEmitterAsyncResource`.
687 - Add tasks wait time accounting in per worker tasks usage.
688 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
692 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
694 ## [2.4.14] - 2023-05-09
698 - Ensure no undefined task runtime can land in the tasks history.
699 - Fix median computation implementation once again.
703 - Unit tests for median and queue implementations.
705 ## [2.4.13] - 2023-05-08
709 - Fix worker choice strategy options validation.
710 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
712 ## [2.4.12] - 2023-05-06
716 - Support multiple task functions per worker.
717 - Add custom worker weights support to worker choice strategies options.
721 - Use O(1) queue implementation for tasks queueing.
725 - Fix median computation implementation.
726 - Fix fair share worker choice strategy internals update.
728 ## [2.4.11] - 2023-04-23
732 - Optimize free worker finding in worker choice strategies.
734 ## [2.4.10] - 2023-04-15
738 - Fix typescript type definition for task function: ensure the input data is optional.
739 - Fix typescript type definition for pool execute(): ensure the input data is optional.
741 ## [2.4.9] - 2023-04-15
745 - Add tasks queue enablement runtime setter to pool.
746 - Add tasks queue options runtime setter to pool.
747 - Add worker choice strategy options runtime setter to pool.
751 - Remove the tasks queuing experimental status.
755 - Fix task function type definition and validation.
756 - Fix worker choice strategy options handling.
758 ## [2.4.8] - 2023-04-12
762 - Fix message between main worker and worker type definition for tasks.
763 - Fix code documentation.
765 ## [2.4.7] - 2023-04-11
769 - Add worker tasks queue options to pool options.
773 - Fix missing documentation.
775 ## [2.4.6] - 2023-04-10
779 - Ensure one task at a time is executed per worker with tasks queueing enabled.
780 - Properly count worker executing tasks with tasks queueing enabled.
782 ## [2.4.5] - 2023-04-09
786 - Use monotonic high resolution timer for worker tasks runtime.
787 - Add worker tasks median runtime to statistics.
788 - Add worker tasks queue (experimental).
790 ## [2.4.4] - 2023-04-07
794 - Add `PoolEvents` enumeration and `PoolEvent` type.
798 - Destroy worker only on alive check.
800 ## [2.4.3] - 2023-04-07
804 - Fix typedoc generation with inheritance.
806 ## [2.4.2] - 2023-04-06
810 - Add `full` event to dynamic pool.
811 - Keep worker choice strategy in memory for conditional reuse.
815 - Fix possible negative worker key at worker removal in worker choice strategies.
817 ## [2.4.1] - 2023-04-05
821 - Optimize worker choice strategy for dynamic pool.
825 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
827 ## [2.4.0] - 2023-04-04
831 - Add `LESS_BUSY` worker choice strategy.
835 - Optimize worker storage in pool.
836 - Optimize worker alive status check.
837 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
838 - Optimize `LESS_USED` worker choice strategy.
839 - Update benchmark versus external threads pools.
840 - Optimize tasks usage statistics requirements for worker choice strategy.
844 - Ensure trimmable characters are checked at pool initialization.
845 - Fix message id integer overflow.
846 - Fix pool worker removal in worker choice strategy internals.
847 - Fix package publication with pnpm.
849 ## [2.4.0-3] - 2023-04-04
853 - Add `LESS_BUSY` worker choice strategy.
857 - Optimize worker storage in pool.
858 - Optimize worker alive status check.
859 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
860 - Optimize `LESS_USED` worker choice strategy.
861 - Update benchmark versus external threads pools.
865 - Ensure trimmable characters are checked at pool initialization.
866 - Fix message id integer overflow.
867 - Fix pool worker removal in worker choice strategy internals.
868 - Fix package publication with pnpm.
870 ## [2.4.0-2] - 2023-04-03
874 - Add `LESS_BUSY` worker choice strategy.
878 - Optimize worker storage in pool.
879 - Optimize worker alive status check.
880 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
881 - Optimize `LESS_USED` worker choice strategy.
885 - Ensure trimmable characters are checked at pool initialization.
886 - Fix message id integer overflow.
887 - Fix pool worker removal in worker choice strategy internals.
888 - Fix package publication with pnpm.
890 ## [2.4.0-1] - 2023-04-03
894 - Add `LESS_BUSY` worker choice strategy.
898 - Optimize worker storage in pool.
899 - Optimize worker alive status check.
900 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
901 - Optimize `LESS_USED` worker choice strategy.
905 - Ensure trimmable characters are checked at pool initialization.
906 - Fix message id integer overflow.
907 - Fix pool worker removal in worker choice strategy internals.
909 ## [2.4.0-0] - 2023-04-03
913 - Add `LESS_BUSY` worker choice strategy.
917 - Optimize worker storage in pool.
918 - Optimize worker alive status check.
919 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
920 - Optimize `LESS_USED` worker choice strategy.
924 - Ensure trimmable characters are checked at pool initialization.
925 - Fix message id integer overflow.
926 - Fix pool worker removal in worker choice strategy internals.
928 ## [2.3.10] - 2023-03-18
932 - Fix package.json `exports` syntax for ESM and CommonJS.
936 - Permit SemVer pre-release publication.
938 ## [2.3.10-2] - 2023-03-18
942 - Fix package.json `exports` syntax for ESM and CommonJS.
944 ## [2.3.10-1] - 2023-03-18
948 - Permit SemVer pre-release publication.
950 ## [2.3.10-0] - 2023-03-18
954 - Fix package.json `exports` syntax for ESM and CommonJS.
956 ## [2.3.9] - 2023-03-18
960 - Introduce ESM module support along with CommonJS one.
964 - Fix brown paper bag bug referencing the same object literal.
966 ## [2.3.8] - 2023-03-18
970 - Switch internal benchmarking code to benny.
971 - Switch to TypeScript 5.x.x.
972 - Switch rollup bundler plugins to core ones.
973 - Switch to TSDoc syntax.
974 - Enforce conventional commits.
978 - Fix random integer generator.
979 - Fix worker choice strategy pool type identification at initialization.
981 ## [2.3.7] - 2022-10-23
985 - Switch to open collective FOSS project funding platform.
986 - Switch to ts-standard linter configuration on TypeScript code.
990 - Fixed missing async on pool execute method.
991 - Fixed typing in TypeScript example.
992 - Fixed types in unit tests.
994 ## [2.3.6] - 2022-10-22
998 - Cleanup pool attributes and methods.
999 - Refine error types thrown.
1003 - Fix continuous integration build on windows.
1004 - Fix code coverage reporting by using c8 instead of nyc.
1006 ## [2.3.5] - 2022-10-21
1010 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1011 - Optimize tasks usage lookup implementation.
1015 - Fix missed pool event emitter type export.
1016 - Fix typedoc documentation generation.
1018 ## [2.3.4] - 2022-10-17
1022 - Fully automate release process with release-it.
1026 - Optimize fair share task scheduling algorithm implementation.
1027 - Update benchmark versus external pools results with latest version.
1029 ## [2.3.3] - 2022-10-15
1033 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1035 ## [2.3.2] - 2022-10-14
1039 - Optimize fair share worker selection strategy implementation.
1043 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1045 ## [2.3.1] - 2022-10-13
1049 - Pool worker choice strategies:
1050 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1051 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1053 ## [2.2.2] - 2022-10-09
1057 - Fixed `README.md` file.
1059 ## [2.2.1] - 2022-10-08
1063 - Dynamic worker choice strategy change at runtime.
1065 ## [2.2.0] - 2022-01-05
1067 ### Breaking Changes
1069 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1071 ## [2.1.0] - 2021-08-29
1075 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1077 ### Breaking Changes
1079 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1080 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1081 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1082 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1084 ## [2.0.2] - 2021-05-12
1088 - Fix `busy` event emission on fixed pool type
1090 ## [2.0.1] - 2021-03-16
1094 - Check if pool options are properly set.
1095 - `busy` event is emitted on all pool types.
1097 ## [2.0.0] - 2021-03-01
1101 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1103 ### Breaking Changes
1105 - `FullPool` event is now renamed to `busy`.
1106 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1107 _Find more details on our JSDoc._
1109 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1111 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1113 ### Pool options types declaration merge
1115 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1117 #### New `export` strategy
1121 const DynamicThreadPool = require('poolifier/lib/dynamic')
1123 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1126 But you should always prefer just using
1129 const { DynamicThreadPool } = require('poolifier')
1132 #### New type definitions for input data and response
1134 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1135 _This is not a limitation by poolifier but Node.js._
1137 #### Public property replacements
1139 `numWorkers` property is now `numberOfWorkers`
1141 #### Internal (protected) properties and methods renaming
1143 These properties are not intended for end users
1145 - `id` => `nextMessageId`
1147 These methods are not intended for end users
1149 - `_chooseWorker` => `chooseWorker`
1150 - `_newWorker` => `createWorker`
1151 - `_execute` => `internalExecute`
1152 - `_chooseWorker` => `chooseWorker`
1153 - `_checkAlive` => `checkAlive`
1155 - `_runAsync` => `runAsync`
1157 ## [1.1.0] - 2020-05-21
1161 - ThreadWorker support async functions as option
1162 - Various external library patches
1164 ## [1.0.0] - 2020-01-24
1168 - FixedThreadPool implementation
1169 - DynamicThreadPool implementation
1170 - WorkerThread implementation to improve developer experience