降级入门

1.编辑Controller层

/*降级入门*/
    /*构建一个AtomicLong对象，提供了线程安全的自增，自减的操作*/
    private AtomicLong atomicLong=new AtomicLong(1);
    private int count;
    @GetMapping("/sentinel04")
    public String sentinel04() throws InterruptedException {
        long num=atomicLong.getAndDecrement();
        if(num%2==0){/*模拟慢调用*/
            Thread.sleep(200);
        }
        return "sentinel 04 text";
    }