Class IntervalTimer

Timing-Functions/IntervalTimer.js:8–58

* @author Nandan V * Sunday, 26 July 2020 8:33 AM * @description Singleton class that handles the timing of tests and * specs. The class is singleton as javascript does not support * multiple timer instances .

 *   multiple timer instances<u/>.
 */
class IntervalTimer {
  /**
   * @description Constructor for Timer.
   * @param interval Sets the interval for running the timer.
   * @param callBack The callback function to be executed.
   * @return {IntervalTimer} If exists, the existing object.
   */
  constructor(interval = 10, callBack = () => {}) {
    this.prevInterval = 0
    if (this.instance == null) {
      this.interval = interval
      this.callBack = callBack
      this.instance = this
    } else {
      return this.instance
    }
  }

  /**
   * @description Starts the timer.
   */
  startTimer() {
    this.timer = setInterval(this.callBack, this.interval)
  }

  /**
   * @description Resets the timer.
   * @return {number} Elapsed time in milliseconds.
   */
  resetTimer() {
    clearInterval(this.timer)
    this.callBack = () => {}
    return this.getElapsedTime()
  }

  /**
   * @return {number} Elapsed time in milliseconds since reset.
   */
  getElapsedTime(offset = 0) {
    this.timeElapsed = this.timer - this.prevInterval
    this.prevInterval = this.timer
    return this.timeElapsed - offset
  }

  /**
   * @return {number} Elapsed time since start.
   */
  getRunTime() {
    return this.timer
  }
}

/**
 * @author Nandan V