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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def close(self):
 """Closes all currently open file pointers"""

        if not self.active:
            return

        self.active = False
        if self._file:
            self._file.close()
            self._sincedb_update_position(force_update=True)

        if self._current_event:
            event = '\n'.join(self._current_event)
            self._current_event.clear()
            self._callback_wrapper([event])