parameters: (self)
docstring: Initiate cancellation.
  
      Advises the RPC system that the caller desires that the RPC call be
      canceled.  The RPC system may cancel it immediately, may wait awhile and
      then cancel it, or may not even cancel the call at all.  If the call is
      canceled, the "done" callback will still be called and the RpcController
      will indicate that the call failed at that time.
docstring_summary: Initiate cancellation.
docstring_tokens: Initiate cancellation .
function: def StartCancel(self):
      """Initiate cancellation.
  
      Advises the RPC system that the caller desires that the RPC call be
      canceled.  The RPC system may cancel it immediately, may wait awhile and
      then cancel it, or may not even cancel the call at all.  If the call is
      canceled, the "done" callback will still be called and the RpcController
      will indicate that the call failed at that time.
      """
      raise NotImplementedError
function_tokens: def StartCancel ( self ) : raise NotImplementedError