code: protected void notifyStartBundlingProcess() {
  
  		for (BundlingProcessLifeCycleListener listener : lifeCycleListeners) {
  			listener.beforeBundlingProcess();
  		}
  		processingBundle.set(true);
  		synchronized (processingBundle) {
  			processingBundle.notifyAll();
  		}
  	}
docs: Notify the start of the bundling process