ice-frontend-react-mobx/server/pollers/RacksPoller.js

ICE Frontend REACT+MobX

const debug = require('debug')('ice:pollers:racks');

import { Rack } from '../models/Rack';

export default class RacksPoller {
  map = null;
  io = null;
  api = null;

  interval = null;

  constructor (map, io, api) {
    this.map = map;
    this.io = io;
    this.api = api;
  }

  startPolling () {
    debug('Starting rack polling');
    this.interval = setInterval(this.poll, 500);
  }

  stopPolling () {
    debug('Stopping rack polling');
    clearInterval(this.interval);
  }

  poll = () => {
    return this.api.getRacks().then((json) => {
      return this.updateFromJson(json);
    }).catch((error) => {
      return this.pollError(error);
    });
  }

  updateFromJson (json) {
    if (Array.isArray(json)) {
      let newIds = [];
      json.forEach((rackJson) => {
        let rack = this.map.get(rackJson.id);

        if (!rack) {
          rack = new Rack(this.io);
          this.map.set(rackJson.id, rack);
        }

        rack.updateFromJson(rackJson);
        newIds.push(rack.id);
      });

      Array.from(this.map.keys()).filter((id) => (newIds.indexOf(id) === -1)).forEach((id) => {
        this.map.get(id).dispose();
        this.map.delete(id);
      });
    }
  }

  pollError (error) {
    debug('Error polling racks:', error);
  }
}