分组功能如启动/停止和打开/关闭是否违反单一责任原则？

For example:

例如：

class Engine {
    private EventExecutor executor;

    public void start() {
        executor.submit(...);
        executor.submit(...);
        //...
    }

    public void stop() {
       executor.shutdown();
    }
}
class Engine {
    private