How to use

CountdownTimer

in

brooklyn.util.time

public static CountdownTimer newInstancePaused(Duration duration) {
  return new CountdownTimer(duration).pause();
}

/** returns a new started {@link CountdownTimer} with this duration */
public CountdownTimer countdownTimer() {
  return CountdownTimer.newInstanceStarted(this);
}

public static CountdownTimer newInstanceStarted(Duration duration) {
  return new CountdownTimer(duration).start();
}

public void waitForEntityStart() {
  if (log.isDebugEnabled()) log.debug("waiting to ensure {} doesn't abort prematurely", this);
  Duration startTimeout = Duration.seconds(getConfig(START_TIMEOUT));
  CountdownTimer timer = startTimeout.countdownTimer();
  boolean isRunningResult = false;
  long delay = 100;
  while (!isRunningResult && !timer.isExpired()) {
    Time.sleep(delay);
    try {
      isRunningResult = driver.isRunning();
    } catch (Exception  e) {
      setAttribute(SERVICE_STATE, Lifecycle.ON_FIRE);
      // provide extra context info, as we're seeing this happen in strange circumstances
      if (driver==null) throw new IllegalStateException(this+" concurrent start and shutdown detected");
      throw new IllegalStateException("Error detecting whether "+this+" is running: "+e, e);
    }
    if (log.isDebugEnabled()) log.debug("checked {}, is running returned: {}", this, isRunningResult);
    // slow exponential delay -- 1.1^N means after 40 tries and 50s elapsed, it reaches the max of 5s intervals  
    delay = Math.min(delay*11/10, 5000);
  }
  if (!isRunningResult) {
    String msg = "Software process entity "+this+" did not pass is-running check within "+
        "the required "+startTimeout+" limit ("+timer.getDurationElapsed()+" elapsed)";
    log.warn(msg+" (throwing)");
    setAttribute(SERVICE_STATE, Lifecycle.ON_FIRE);
    throw new IllegalStateException(msg);
  }
}