@Override
    public String getStr(String str) {
        LOGGER.info("c get req from b :" + str);
        try {
            Thread.sleep(time);
        } catch (Exception e) {

        }
        return "c2b" + str;
    }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
example/src/test/java/com/alipay/sofa/rpc/asynchain/ServiceCImpl.java