2020-11-23〜2020-11-30

// backend.js

import {
  Component,
  primaryIdentifier,
  attribute,
  method,
  expose
} from '@layr/component';
import {ComponentHTTPServer} from '@layr/component-http-server';

class Counter extends Component {
  // We need a primary identifier so a Counter instance
  // can be transported between the frontend and the backend
  // while keeping it's identity
  @expose({get: true, set: true}) @primaryIdentifier() id;

  // The counter value is exposed to the frontend
  @expose({get: true, set: true}) @attribute() value = 0;

  // And the "business logic" is exposed as well
  @expose({call: true}) @method() increment() {
    this.value++;
  }
}

// Lastly, we serve the Counter class through an HTTP server
const server = new ComponentHTTPServer(Counter, {port: 3210});
server.start();

// frontend.js

import {ComponentHTTPClient} from '@layr/component-http-client';

(async () => {
  // We create a client to connect to the backend server
  const client = new ComponentHTTPClient('http://localhost:3210');

  // We get a proxy to the Counter backend class
  const Counter = await client.getComponent();

  // Lastly, we consume the Counter
  const counter = new Counter();
  console.log(counter.value); // => 0
  await counter.increment();
  console.log(counter.value); // => 1
  await counter.increment();
  console.log(counter.value); // => 2
})();