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2 <img src="./images/logo.png" width="340px" height="266px"/>
3 </div>
4
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
25 </div>
26
27 ## Why Poolifier?
28
29 Poolifier 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.
30 With poolifier you can improve your **performance** and resolve problems related to the event loop.
31 Moreover you can execute your tasks using an API designed to improve the **developer experience**.
32 Please consult our [general guidelines](#general-guidelines).
33
34 - Easy to use :white_check_mark:
35 - Fixed and dynamic pool size :white_check_mark:
36 - Easy switch from a pool type to another :white_check_mark:
37 - Performance [benchmarks](./benchmarks/README.md) :white_check_mark:
38 - No runtime dependencies :white_check_mark:
39 - Proper integration with Node.js [async_hooks](https://nodejs.org/api/async_hooks.html) :white_check_mark:
40 - Support for CommonJS, ESM and TypeScript :white_check_mark:
41 - 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:
42 - Tasks distribution strategies :white_check_mark:
43 - Lockless tasks queueing :white_check_mark:
44 - Queued tasks rescheduling:
45 - Task stealing on idle :white_check_mark:
46 - Tasks stealing under back pressure :white_check_mark:
47 - Tasks redistribution on worker error :white_check_mark:
48 - Support for sync and async task function :white_check_mark:
49 - Support for abortable task function :white_check_mark:
50 - Support for multiple task functions with per task function queuing priority and tasks distribution strategy :white_check_mark:
51 - Support for task functions [CRUD](https://en.wikipedia.org/wiki/Create,_read,_update_and_delete) operations at runtime :white_check_mark:
52 - General guidelines on pool choice :white_check_mark:
53 - Error handling out of the box :white_check_mark:
54 - Widely tested :white_check_mark:
55 - Active community :white_check_mark:
56 - Code quality [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=bugs)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
57 [![Code Smells](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=code_smells)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
58 [![Duplicated Lines (%)](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=duplicated_lines_density)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
59 [![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
60 [![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
61 [![Technical Debt](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=sqale_index)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
62 - Code security [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=security_rating)](https://sonarcloud.io/dashboard?id=poolifier_poolifier) [![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=poolifier_poolifier&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=poolifier_poolifier)
63
64 ## Table of contents
65
66 - [Overview](#overview)
67 - [Installation](#installation)
68 - [Usage](#usage)
69 - [Node.js versions](#nodejs-versions)
70 - [API](#api)
71 - [General guidelines](#general-guidelines)
72 - [Worker choice strategies](#worker-choice-strategies)
73 - [Contribute](#contribute)
74 - [Team](#team)
75 - [License](#license)
76
77 ## Overview
78
79 Poolifier 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.
80 The first implementation is a fixed worker pool, with a defined number of workers that are started at creation time and will be reused.
81 The 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.
82 You have to implement your worker by extending the _ThreadWorker_ or _ClusterWorker_ class.
83
84 ## Installation
85
86 ### npmjs
87
88 ```shell
89 npm install poolifier --save
90 ```
91
92 ### JSR
93
94 ```shell
95 npx jsr add @poolifier/poolifier
96 ```
97
98 ## Usage
99
100 You can implement a poolifier [worker_threads](https://nodejs.org/api/worker_threads.html#class-worker) worker in a simple way by extending the class _ThreadWorker_:
101
102 ```js
103 import { ThreadWorker } from 'poolifier'
104
105 function yourFunction(data) {
106 // this will be executed in the worker thread,
107 // the data will be received by using the execute method
108 return { ok: 1 }
109 }
110
111 export default new ThreadWorker(yourFunction, {
112 maxInactiveTime: 60000,
113 })
114 ```
115
116 Instantiate your pool based on your needs :
117
118 ```js
119 import { DynamicThreadPool, FixedThreadPool, PoolEvents, availableParallelism } from 'poolifier'
120
121 // a fixed worker_threads pool
122 const pool = new FixedThreadPool(availableParallelism(), './yourWorker.js', {
123 onlineHandler: () => console.info('worker is online'),
124 errorHandler: e => console.error(e),
125 })
126
127 pool.emitter?.on(PoolEvents.ready, () => console.info('Pool is ready'))
128 pool.emitter?.on(PoolEvents.busy, () => console.info('Pool is busy'))
129
130 // or a dynamic worker_threads pool
131 const pool = new DynamicThreadPool(Math.floor(availableParallelism() / 2), availableParallelism(), './yourWorker.js', {
132 onlineHandler: () => console.info('worker is online'),
133 errorHandler: e => console.error(e),
134 })
135
136 pool.emitter?.on(PoolEvents.full, () => console.info('Pool is full'))
137 pool.emitter?.on(PoolEvents.ready, () => console.info('Pool is ready'))
138 pool.emitter?.on(PoolEvents.busy, () => console.info('Pool is busy'))
139
140 // the execute method signature is the same for both implementations,
141 // so you can easily switch from one to another
142 try {
143 const res = await pool.execute()
144 console.info(res)
145 } catch (err) {
146 console.error(err)
147 }
148 ```
149
150 You can do the same with the classes _ClusterWorker_, _FixedClusterPool_ and _DynamicClusterPool_.
151
152 **See [examples](./examples/) for more details**:
153
154 - [Javascript](./examples/javascript/)
155 - [Typescript](./examples/typescript/)
156 - [HTTP client pool](./examples/typescript/http-client-pool/)
157 - [SMTP client pool](./examples/typescript/smtp-client-pool/)
158 - [HTTP server pool](./examples/typescript/http-server-pool/)
159 - [Express worker_threads pool](./examples/typescript/http-server-pool/express-worker_threads/)
160 - [Express cluster pool](./examples/typescript/http-server-pool/express-cluster/)
161 - [Express hybrid pool](./examples/typescript/http-server-pool/express-hybrid/)
162 - [Fastify worker_threads pool](./examples/typescript/http-server-pool/fastify-worker_threads/)
163 - [Fastify cluster pool](./examples/typescript/http-server-pool/fastify-cluster/)
164 - [Fastify hybrid pool](./examples/typescript/http-server-pool/fastify-hybrid/)
165 - [WebSocket server pool](./examples/typescript/websocket-server-pool/)
166 - [ws worker_threads pool](./examples/typescript/websocket-server-pool/ws-worker_threads/)
167 - [ws cluster pool](./examples/typescript/websocket-server-pool/ws-cluster/)
168 - [ws hybrid pool](./examples/typescript/websocket-server-pool/ws-hybrid/)
169
170 Remember that workers can only send and receive structured-cloneable data.
171
172 ## Node.js versions
173
174 Node.js versions >= 20.x.x are supported.
175
176 ## [API](./docs/api.md)
177
178 ## [General guidelines](./docs/general-guidelines.md)
179
180 ## [Worker choice strategies](./docs/worker-choice-strategies.md)
181
182 ## Contribute
183
184 Choose your task [here](https://github.com/orgs/poolifier/projects/1), propose an idea, a fix, an improvement.
185
186 See [CONTRIBUTING](./CONTRIBUTING.md) guidelines.
187
188 ## Team
189
190 **Creator/Owner:**
191
192 - [**Alessandro Pio Ardizio**](https://github.com/pioardi)
193
194 **Maintainers:**
195
196 - [**Jérôme Benoit**](https://github.com/jerome-benoit)
197
198 **Contributors:**
199
200 - [**Shinigami92**](https://github.com/Shinigami92)
201
202 ## License
203
204 [MIT](./LICENSE)