ExlusiveControl.js

import Promise from 'bluebird';
import { Mutex } from 'await-semaphore';

const mutex = new Mutex();

mutex.use(() => {
  // write process you want to control exclusively
  // example shows below
  const promise = new Promise((resolve) => {
    Promise.props({                       // see. http://bluebirdjs.com/docs/api/promise.props.html
      labels: this.getLabels(),           // Slow and asynchronous process
      feelings: this.getFeelingsData(),   // Slow and asynchronous process
    })
    .then((result) => {
      this.labels.replace(result.labels);
      this.feelingsData.replace(result.feelings);
      resolve(true);
    })
    .catch((e) => {
      throw e;
    });
  });
  return promise;
}