<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def destroy(self):
        '''
        Called from tearDown of simulation tests. Cleans up everything.
        '''
        defers = list()
        for x in self.iter_agents():
            defers.append(x.terminate_hard())
        yield defer.DeferredList(defers)
        yield self._journaler.close()
        del(self._journaler)
        del(self._jourwriter)
        del(self._messaging)
        del(self._tunneling_bridge)
        del(self._database)
        del(self._agencies)
        del(self._breakpoints)
        del(self._parser)
        del(self._output)