Nodejs worker threads shared object/store

Question

So, I was reading some stuff regarding nodejs and I was amazed when I came across Worker Threads.

Having threads in my opinion is a great plus especially if you combine

Answer 1

ECMA Script contains no shared objects but it have SharedArrayBuffer. And you can implement such behavior on your own writing data directly in buffer using DataView and wrapper:

// Shared value
class SharedPoint {
  constructor(array) {
    this.dataview = new DataView(array);
  }

  set x(value) {
    this.dataview.setUint8(0, value);
  }

  set y(value) {
    this.dataview.setUint8(1, value);
  }

  get x() {
    return this.dataview.getUint8(0);
  }

  get y() {
    return this.dataview.getUint8(1);
  }
}

// Usage

const buffer = new SharedArrayBuffer(2);

// Create two instances of shared point.
const point0 = new SharedPoint(buffer);
const point1 = new SharedPoint(buffer);

// Get initial values for point #1
console.log('x', point1.x); // 0
console.log('y', point1.y); // 0

// Update point #0
point0.x = 64;
point0.y = 32;

// Get changes in point #1
console.log('x', point1.x); // 64
console.log('y', point1.y); // 32

You are able to create class which can manipulate strings or C-like structures. While SharedArrayBuffer is tranferable object it can be shared between worker and main process.

⚠️ Note Due to Spectre attack SharedArrayBuffer was disabled by all major browsers and reenabled in Chrome since version 68 and in Firefox since version 79. Check browsers support on can i use.