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

ICE Frontend REACT+MobX

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

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

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

  interval = null;

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

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

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

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

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

        if (!group) {
          group = new Group(this.io);
          this.map.set(groupJson.id, group);
        }

        group.updateFromJson(groupJson);
      });

      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 groups:', error);
  }
}