@property
    def allow_async(self):

        if self._mode is _WRITER:
            raise TypeError("Setting async on a WRITER makes no sense")
        return self._clone(allow_async=True)
Disconnect all cached connections.
dataset/ETHPy150Open openstack/oslo.db/oslo_db/sqlalchemy/enginefacade.py/_TransactionContextManager.allow_async--crossover with--dataset/ETHPy150Open twisted/vertex/vertex/conncache.py/ConnectionCache.shutdown