晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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import logging
import threading
from playhouse.sqlite_ext import SqliteExtDatabase
class OverridingReset(Exception):
"""
Overriding reset could be a signal of logic error
thus need to be explicitly handled in all places where
this exception is expected to occur.
"""
pass
logger = logging.getLogger(__name__)
_thread_local_storage = threading.local()
class SqliteDatabaseWrapper(SqliteExtDatabase):
def execute_sql(self, *args, **kwargs):
_validate(*args, **kwargs)
return super().execute_sql(*args, **kwargs)
def reset(new_value=None):
if hasattr(_thread_local_storage, "thread_ident_memo"):
raise OverridingReset()
_thread_local_storage.thread_ident_memo = (
new_value or threading.get_ident()
)
def _validate(*args, **kwargs):
thread_ident_memo = getattr(
_thread_local_storage, "thread_ident_memo", None
)
if thread_ident_memo is None:
logger.error("wrong thread or _validate() was not preceded by reset()")
elif thread_ident_memo != threading.get_ident():
logger.error(
"thread_ident_memo check failed [%r != %r]\n"
"context:\nargs: %s\nkwargs: %s",
thread_ident_memo,
threading.get_ident(),
args,
kwargs,
)