guava LoadingCache 不阻塞

代码

  LoadingCache<String, String> loadingCache = CacheBuilder.newBuilder()
                .refreshAfterWrite(2, TimeUnit.SECONDS).maximumSize(5)
                .build(CacheLoader.asyncReloading(new CacheLoader<String, String>() {
                    @Override
                    public String load(String key) throws Exception {
                        System.out.println(Thread.currentThread().getName() + " 加载数据开始---");
                        Thread.sleep(1000);
                        Random random = new Random();
                        System.out.println(Thread.currentThread().getName() + " 加载数据结束----");
                        return "value:" + random.nextInt(10000);
                    }
                }, ForkJoinPool.commonPool()));

        while (true){
//            String s = cache.get(1);
            String s = loadingCache.get("1");
            System.out.println(s);
            Thread.sleep(100);
        }