public boolean hasInvoker() {
        this.readLock.lock();
        try {
            return !this.uniqueIdInvokerMap.isEmpty();
        } finally {
            this.readLock.unlock();
        }
    }
returns is there any invoker has registed into this invoker
remoting/remoting-triple/src/main/java/com/alipay/sofa/rpc/server/triple/UniqueIdInvoker.java