Tools to manage workers in browsers, node.js and deno

@dekkai/workers

Worker tools to manage workers in browsers, node.js and deno.

Provides a minimum common API between all the platforms through wrappers:

• WorkerWrapper: Wraps a worker and exposes addEventListenr/removeEventListener, on/off and utility functions.
• WorkerSelf: Wraps the self interface to expose the same API on all platforms.
• WorkerInterface: Provides an interface to wrap objects in workers and handle messaging with the main thread.
• WorkerPool: Class to schedule tasks and handling messages with multiple workers.
• envNodeJS: Utility functions to detect node and handle loading CommonJS (require) and ES Modules (import).

Check out the full API Documentation

Installation

Browser/NodeJS

$ yarn add @dekkai/workers

Deno

// import from directly from a CDN, like unpkg.com
import {WorkerPool} from 'https://unpkg.com/@dekkai/workers';

Usage

Create a task executor in your worker code

// simple.worker.js

// import WorkerInterface
import {WorkerInterface} from '@dekkai/workers';

// create an object (can be a class) that will perform the worker tasks.
// Each function in the object will be registered as a task.
// Tasks must return a TaskResult object:
// export interface TaskResult<T> {
//     result: T;
//     transfer?: ArrayBuffer[];
// }
class MyTaskExecutor {
    ping() {
        return { result: 'pong' };
    }
}

// register the object as a task executor
WorkerInterface.instance.addTaskExecutor(new MyTaskExecutor());

Use a WorkerPool in your main thread

// main.js

// import WorkerPool and optionally WorkerWrapper 
import {WorkerPool, WorkerWrapper} from '@dekkai/workers';

// create some workers
// in the browser:
const worker = new Worker('./simple.worker.js', { type: 'module' });
// in node: import worker_threads from  'worker_threads';
const worker = new worker_threads.Worker('./simple.worker.js');
// in deno
const worker = new Worker(new URL('./simple.worker.js', import.meta.url), { type: 'module' });
// or use the convenience function in the WorkerWrapper class
const worker = await WorkerWrapper.createWorker('./simple.worker.js', { type: 'module' });

// initialize a worker pool
// workers can be added when constructing the pool
const pool = new WorkerPool([worker1, worker2, ...]);
// after the pool is initialized as an array
pool.addWorkers([worker1, worker2, ...]);
// or one by one
pool.addWorker(worker);

// create a task to execute
const task = pool.makeTask('ping');

// schedule the task
// you can `await` for the result
const result = await pool.scheduleTask(task);
assert(result === 'pong');
// or you can handle the result later using promises
pool.scheduleTask(task).then(result => assert(result === 'pong'));

Check out the full API Documentation

Deno notes

Unfortunately the Worker API in deno is incomplete, and the full API will not be operational until the following bug is resolved: https://github.com/denoland/deno/issues/3557

The current status of deno tests is:

  WorkerWrapper
    ✓ should be able to wrap a worker for the platform
    ✓ returns the original worker through its `worker` property
    ✓ can instantiate workers for the platform at runtime
    ✓ wraps the `postMessage` interface
    ✓ listens to events using the `on` method
    ✓ listens to events using the `addEventListener` method
    ✓ removes listeners using the `off` method
    ✓ removes listeners using the `removeEventListener` method
    ✓ invalidates its internal worker when `terminate` is called

  WorkerSelf
    ✓ returns the original context through the `self` property
    ✓ can listen to messages using the `on` API
    ✓ can listen to messages using the `addEventListener` API
    ✓ removes listeners using the `off` API
    ✓ removes listeners using the `removeEventListener` API
    ✓ can post messages using `postMessage`

  WorkerInterface
    ✓ can add and forward commands to a task executor object
    ✓ raises an error on unknown tasks
    ✓ can remove task executor objects and ignores messages when empty
    ✓ can add and forward messages to multiple executors
    ✓ properly forwards arguments to tasks
    1) receives transferred objects and transfers objects back

  WorkerPool
    ✓ can be constructed with an array of workers
    ✓ returns its worker count through the `workerCount` property
    ✓ can add new worker one by one
    ✓ can add multiple workers at once
    ✓ wraps its workers
    2) schedules a task without arguments
    3) schedules a task with arguments
    4) can schedule an init task when adding a worker
    5) handles objects marked for transfer in tasks
    6) schedules an array of tasks
    7) schedules tasks in multiple workers simultaneously
    8) correctly reports if tasks are running
    9) cancels all pending tasks
    10) cancels pending tasks with a specific id
    ✓ can kill all its workers

  API
    11) executes an init task when workers are added
    12) executes tasks simultaneously
    13) can queue more tasks than workers in the pool
    ✓ can kill all of its workers
    14) properly transfers objects both ways

  27 passing (8s)
  14 failing

Download Details:

Author: dekkai-csv

Source Code: https://github.com/dekkai-csv/workers

#nodejs #deno #node #javascript

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Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

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What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

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In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

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This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

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There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

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Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

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