@Override
    public Connection createStandaloneConnection(String address, int connectTimeout)
                                                                                    throws RemotingException {
        ensureStarted();
        return this.connectionManager.create(address, connectTimeout);
    }
Shutdown.
<p>
Notice:<br>
  <li>Rpc client can not be used any more after shutdown.
  <li>If you need, you should destroy it, and instantiate another one.
src/main/java/com/alipay/remoting/rpc/RpcClient.java