Workerize

Export functions or class into a worker context in nodejs and web browser. Tasks are cancellable.

Installation

$ npm i @tbela99/workerize

the

Node usage

import {
    workerize,
    dispose
} from "@tbela99/workerize";

// do node stuff

Web browser browser usage

import {
    workerize,
    dispose
} from "@tbela99/workerize/web";

// do browser stuff

Alternatively, you can use the 'browser.js' script which uses the UMD module format.

<script src="dist/browser.js"></script>
<script>

    const func = workerize.workerize(function () {
        
        // do something
    })
</script>

Using a function

The function is turned into an async proxy.

Web example

import {
    workerize,
    dispose
} from "@tbela99/workerize/web";

// async and arrow functions can be passed as well 
const func = workerize(function (...args) {

    return args.reduce((acc, curr) => acc + curr, 0);
});

response = await func(1, 2, 70); // 74

// terminate the service worker
dispose(func);

Using a class

All class methods are turned into async proxies.

Node example

import {
    workerize,
    dispose
} from "@tbela99/workerize";

// pass a class definition
const Class = workerize(class {

    type;
    name;
    age;

    constructor(type, age, name = '') {

        this.type = type;
        this.age = age;
        this.name = name;

        if (name === '') {

            let number = Math.floor(3 + 3 * Math.random());

            while (number--) {

                this.name += String.fromCharCode([65, 97][Math.floor(2 * Math.random())] + Math.floor(26 * Math.random()))
            }
        }
    }

    say() {

        return `${this.name} says: I am a ${this.age} year(s) old ${this.type}`;
    }
});

// create an instance 
const dog = new Class('Dog', 2, 'Marvin');

console.log(await dog.say()); // 'Marin says: I am a 2 years(s) old Dog'

// terminate the service worker
dispose(dog);

Injecting dependencies

You can inject javascript libraries into the worker context.

import {
    workerize,
    dispose
} from "@tbela99/workerize";

const func = workerize(function (...args) {

    // sum function is defined in ./js/sum.js
    return sum(...args);
}, {dependencies: ['./js/sum.js']});

const result = await func(5, 43, 10);

console.log(result); // 58

dispose(func);

Injecting modules

import {
    workerize,
    dispose
} from "@tbela99/workerize";

const func = workerize(function (...args) {

    // an array called 'modules' containing the declared modules is injected in the scope
    // modules are in the same order they are declared
    // add is exported by the module ./js/add.js
    return modules[0].add(...args);
    
}, {dependencies: ['./js/add.js'], module: true});

const result = await func(5, 43, 10);

console.log(result); // 58

dispose(func);

Documentation

Workerize

parameters:

• task: function or class to execute in the worker context.
• options: optional, worker options.

worker options:

• dependencies: array. an array of javascript files to inject as module or dependencies
• module: boolean. If true, dependencies are injected as modules. A variable of type array called 'modules' will be injected in the scope. it contains the injected modules in the same order as they were injected.
• signal: optional. AbortSignal instance used to abort the worker execution and delete it

Dispose

Delete the worker instance.

Usage

dispose(worker1 [, worker2, ..., workern]);

A note about the proxies parameters

All parameters you pass to the proxy must be transferable. Objects will be serialized and deserialized as JSON data. All methods, property settter and getter are removed.

License

MIT OR LGPL-3.0

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