@Override
        public void updateProviders(ProviderGroup providerGroup) {
            ps.put(providerGroup.getName(), providerGroup);
            if (countDownLatch != null) {
                countDownLatch.countDown();
                countDownLatch = null;
            }
        }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
registry/registry-local/src/test/java/com/alipay/sofa/rpc/registry/local/LocalRegistryTest.java