@Override
            public Boolean call() throws Exception {
                return CommonUtils.isEmpty(consumerConfig.getConsumerBootstrap()
                    .getCluster().getConnectionHolder().getAvailableConnections());
            }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
test/test-integration/src/test/java/com/alipay/sofa/rpc/client/rest/RestDirectUrlTest.java