<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def dispose(self):
 """Disposes of this events writer manager, making it no longer usable. Call this method when this object is done being used in order to clean up resources and handlers. This method should ever only be called once. """

    self._lock.acquire()
    self._events_writer.Close()
    self._events_writer = None
    self._lock.release()