'Execute the callback function with the matched stanza payload.
:param payload: The matched
:class:`~sleekxmpp.xmlstream.stanzabase.ElementBase` object.
:param bool instream: Force the handler to execute during stream
processing. This should only be used by
:meth:`prerun()`. Defaults to ``False``.'

def run(self, payload, instream=False):

    if ((not self._instream) or instream):
        self._pointer(payload)
        if self._once:
            self._destroy = True
            del self._pointer
