def activate(self):
    self.log.debug(("Activating callback '%s'.." % self._name))
    if self.is_active():
        self.log.debug(('%s already active, ignoring' % self._name))
        return
    self._id = self._installer(*self._args)
def activate(self):
    self.log.debug(("Activating callback '%s'.." % self._name))
    if self.is_active():
        self.log.debug(('%s already active, ignoring' % self._name))
        return
    self._id = self._installer(*self._args)