Waiting for running async bukkit tasks to finish inside onDisable()

SomePlugin.java

// inside the plugin class
private static final long ASYNC_TASKS_TIMEOUT_SECONDS = 10;

@Override
public void onDisable() {
  // wait for async tasks to complete:
  final long asyncTasksTimeoutMillis = ASYNC_TASKS_TIMEOUT_SECONDS * 1000;
  final long asyncTasksStart = System.currentTimeMillis();
  boolean asyncTasksTimeout = false;
  while (this.getActiveAsyncTasks() > 0) {
    try {
      Thread.sleep(5);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    // after timeout disable anyways..:
    if (System.currentTimeMillis() - asyncTasksStart > asyncTasksTimeoutMillis) {
      asyncTasksTimeout = true;
      this.getLogger().warning("Waited " + ASYNC_TASKS_TIMEOUT_SECONDS + " seconds for " + this.getActiveAsyncTasks()
                  + " remaining async tasks to complete. Disabling now anyways..");
      break;
    }
  }
  final long asyncTasksTimeWaited = System.currentTimeMillis() - asyncTasksStart;
  if (!asyncTasksTimeout && asyncTasksTimeWaited > 1) {
    this.getLogger().info("Waited " + asyncTasksTimeWaited + " ms for async tasks to finish.");
  }
}

private int getActiveAsyncTasks() {
  int workers = 0;
  for (BukkitWorker worker : Bukkit.getScheduler().getActiveWorkers()) {
    if (worker.getOwner().equals(this)) {
      workers++;
    }
  }
  return workers;
}