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1<div align="center">
2 <img src="./images/logo.png" width="340px" height="266px"/>
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5<div align="center">
6
7# Node.js Worker_Threads and Cluster Worker Pool
8
9</div>
10
11<div align="center">
12
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24</div>
25
26## Why Poolifier?
27
28Poolifier is used to perform CPU and/or I/O intensive tasks on Node.js servers, it implements worker pools using [worker_threads](https://nodejs.org/api/worker_threads.html) and [cluster](https://nodejs.org/api/cluster.html) Node.js modules.
29With poolifier you can improve your **performance** and resolve problems related to the event loop.
30Moreover you can execute your tasks using an API designed to improve the **developer experience**.
31Please consult our [general guidelines](#general-guidelines).
32
33- Easy to use :white_check_mark:
34- Fixed and dynamic pool size :white_check_mark:
35- Easy switch from a pool type to another :white_check_mark:
36- Performance [benchmarks](./benchmarks/README.md) :white_check_mark:
37- No runtime dependencies :white_check_mark:
38- Proper integration with Node.js [async_hooks](https://nodejs.org/api/async_hooks.html) :white_check_mark:
39- Support for CommonJS, ESM, and TypeScript :white_check_mark:
40- Support for [worker_threads](https://nodejs.org/api/worker_threads.html) and [cluster](https://nodejs.org/api/cluster.html) Node.js modules :white_check_mark:
41- Support for multiple task functions :white_check_mark:
42- Support for task functions [CRUD](https://en.wikipedia.org/wiki/Create,_read,_update_and_delete) operations at runtime :white_check_mark:
43- Support for sync and async task functions :white_check_mark:
44- Tasks distribution strategies :white_check_mark:
45- Lockless tasks queueing :white_check_mark:
46- Queued tasks rescheduling:
47 - Task stealing :white_check_mark:
48 - Tasks stealing under back pressure :white_check_mark:
49 - Tasks redistribution on worker error :white_check_mark:
50- General guidelines on pool choice :white_check_mark:
51- Error handling out of the box :white_check_mark:
52- Widely tested :white_check_mark:
53- Active community :white_check_mark:
54- Code quality [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=pioardi_poolifier&metric=bugs)](https://sonarcloud.io/dashboard?id=pioardi_poolifier)
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60- Code security [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=pioardi_poolifier&metric=security_rating)](https://sonarcloud.io/dashboard?id=pioardi_poolifier) [![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=pioardi_poolifier&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=pioardi_poolifier)
61
62## Table of contents
63
64- [Overview](#overview)
65- [Installation](#installation)
66- [Usage](#usage)
67- [Node.js versions](#nodejs-versions)
68- [API](#api)
69- [General guidelines](#general-guidelines)
70- [Worker choice strategies](#worker-choice-strategies)
71- [Contribute](#contribute)
72- [Team](#team)
73- [License](#license)
74
75## Overview
76
77Poolifier contains two [worker_threads](https://nodejs.org/api/worker_threads.html#class-worker)/[cluster](https://nodejs.org/api/cluster.html#cluster_class_worker) worker pool implementations, you don't have to deal with [worker_threads](https://nodejs.org/api/worker_threads.html)/[cluster](https://nodejs.org/api/cluster.html) complexity.
78The first implementation is a fixed worker pool, with a defined number of workers that are started at creation time and will be reused.
79The second implementation is a dynamic worker pool, with a number of worker started at creation time (these workers will be always active and reused) and other workers created when the load will increase (with an upper limit, these workers will be reused when active), the newly created workers will be stopped after a configurable period of inactivity.
80You have to implement your worker by extending the _ThreadWorker_ or _ClusterWorker_ class.
81
82## Installation
83
84```shell
85npm install poolifier --save
86```
87
88## Usage
89
90You can implement a [worker_threads](https://nodejs.org/api/worker_threads.html#class-worker) worker in a simple way by extending the class _ThreadWorker_:
91
92```js
93'use strict'
94const { ThreadWorker } = require('poolifier')
95
96function yourFunction(data) {
97 // this will be executed in the worker thread,
98 // the data will be received by using the execute method
99 return { ok: 1 }
100}
101
102module.exports = new ThreadWorker(yourFunction, {
103 maxInactiveTime: 60000
104})
105```
106
107Instantiate your pool based on your needs :
108
109```js
110'use strict'
111const { DynamicThreadPool, FixedThreadPool, PoolEvents, availableParallelism } = require('poolifier')
112
113// a fixed worker_threads pool
114const pool = new FixedThreadPool(availableParallelism(), './yourWorker.js', {
115 errorHandler: (e) => console.error(e),
116 onlineHandler: () => console.info('worker is online')
117})
118
119pool.emitter.on(PoolEvents.ready, () => console.info('Pool is ready'))
120pool.emitter.on(PoolEvents.busy, () => console.info('Pool is busy'))
121
122// or a dynamic worker_threads pool
123const pool = new DynamicThreadPool(Math.floor(availableParallelism() / 2), availableParallelism(), './yourWorker.js', {
124 errorHandler: (e) => console.error(e),
125 onlineHandler: () => console.info('worker is online')
126})
127
128pool.emitter.on(PoolEvents.full, () => console.info('Pool is full'))
129pool.emitter.on(PoolEvents.ready, () => console.info('Pool is ready'))
130pool.emitter.on(PoolEvents.busy, () => console.info('Pool is busy'))
131
132// the execute method signature is the same for both implementations,
133// so you can easily switch from one to another
134pool
135 .execute()
136 .then((res) => {
137 console.info(res)
138 })
139 .catch((err) => {
140 console.error(err)
141 })
142```
143
144You can do the same with the classes _ClusterWorker_, _FixedClusterPool_ and _DynamicClusterPool_.
145
146**See [examples](./examples/) for more details**:
147
148- [Javascript](./examples/javascript/)
149- [Typescript](./examples/typescript/)
150 - [HTTP client pool](./examples/typescript/http-client-pool/)
151 - [SMTP client pool](./examples/typescript/smtp-client-pool/)
152 - [HTTP server pool](./examples/typescript/http-server-pool/)
153 - [Express worker_threads pool](./examples/typescript/http-server-pool/express-worker_threads/)
154 - [Express cluster pool](./examples/typescript/http-server-pool/express-cluster/)
155 - [Express hybrid pool](./examples/typescript/http-server-pool/express-hybrid/)
156 - [Fastify worker_threads pool](./examples/typescript/http-server-pool/fastify-worker_threads/)
157 - [Fastify cluster pool](./examples/typescript/http-server-pool/fastify-cluster/)
158 - [Fastify hybrid pool](./examples/typescript/http-server-pool/fastify-hybrid/)
159 - [WebSocket server pool](./examples/typescript/websocket-server-pool/)
160 - [ws worker_threads pool](./examples/typescript/websocket-server-pool/ws-worker_threads/)
161 - [ws cluster pool](./examples/typescript/websocket-server-pool/ws-cluster/)
162 - [ws hybrid pool](./examples/typescript/websocket-server-pool/ws-hybrid/)
163
164Remember that workers can only send and receive structured-cloneable data.
165
166## Node.js versions
167
168Node.js versions >= 16.14.x are supported.
169
170## [API](./docs/api.md)
171
172## [General guidelines](./docs/general-guidelines.md)
173
174## [Worker choice strategies](./docs/worker-choice-strategies.md)
175
176## Contribute
177
178Choose your task [here](https://github.com/orgs/poolifier/projects/1), propose an idea, a fix, an improvement.
179
180See [CONTRIBUTING](./CONTRIBUTING.md) guidelines.
181
182## Team
183
184**Creator/Owner:**
185
186- [**Alessandro Pio Ardizio**](https://github.com/pioardi)
187
188**Maintainers:**
189
190- [**Jérôme Benoit**](https://github.com/jerome-benoit)
191
192**Contributors:**
193
194- [**Shinigami92**](https://github.com/Shinigami92)
195
196## License
197
198[MIT](./LICENSE)