code: def execute(self, main_class, cwd=None, *args, **environment):
      
      environment = dict(**environment)
      environment.update(self.ENV_DEFAULTS)
      cwd = cwd or self._workdir
  
      sock = self.try_connect()
  
      # TODO(#6579): NailgunClientSession currently requires callbacks because it can't depend on
      # having received these chunks, so we need to avoid clobbering these fields until we initialize
      # a new session.
      self._current_remote_pid = None
      self._current_remote_pgrp = None
      self._session = NailgunClientSession(
        sock=sock,
        in_file=self._stdin,
        out_file=self._stdout,
        err_file=self._stderr,
        exit_on_broken_pipe=self._exit_on_broken_pipe,
        remote_pid_callback=self._receive_remote_pid,
        remote_pgrp_callback=self._receive_remote_pgrp)
      try:
        return self._session.execute(cwd, main_class, *args, **environment)
      except (socket.error, NailgunProtocol.ProtocolError) as e:
        raise self.NailgunError(
          address=self._address_string,
          pid=self._maybe_last_pid(),
          pgrp=self._maybe_last_pgrp(),
          wrapped_exc=e,
        )
      finally:
        sock.close()
        self._session = None
docs: Executes the given main_class with any supplied args in the given environment.
  
      :param string main_class: the fully qualified class name of the main entrypoint
      :param string cwd: Set the working directory for this command
      :param list args: any arguments to pass to the main entrypoint
      :param dict environment: an env mapping made available to native nails via the nail context
      :returns: the exit code of the main_class.
      :raises: :class:`NailgunClient.NailgunError` if there was an error during execution.