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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#------------------------------------------------------------------------
#
# Copyright (C) 2000 Autonomous Zone Industries
#
# License:      This is free software.  You may use this software for any
#               purpose including modification/redistribution, so long as
#               this header remains intact and that you do not claim any
#               rights of ownership or authorship of this software.  This
#               software has been tested, but no warranty is expressed or
#               implied.
#
# Author: Gregory P. Smith <greg@krypto.org>
#
# Note: I don't know how useful this is in reality since when a
#       DBLockDeadlockError happens the current transaction is supposed to be
#       aborted.  If it doesn't then when the operation is attempted again
#       the deadlock is still happening...
#       --Robin
#
#------------------------------------------------------------------------


#
# import the time.sleep function in a namespace safe way to allow
# "from bsddb.dbutils import *"
#
from time import sleep as _sleep

import sys
absolute_import = (sys.version_info[0] >= 3)
if absolute_import :
    # Because this syntaxis is not valid before Python 2.5
    exec("from . import db")
else :
    import db

# always sleep at least N seconds between retrys
_deadlock_MinSleepTime = 1.0/128
# never sleep more than N seconds between retrys
_deadlock_MaxSleepTime = 3.14159

# Assign a file object to this for a "sleeping" message to be written to it
# each retry
_deadlock_VerboseFile = None


def DeadlockWrap(function, *_args, **_kwargs):
    """DeadlockWrap(function, *_args, **_kwargs) - automatically retries
    function in case of a database deadlock.

    This is a function intended to be used to wrap database calls such
    that they perform retrys with exponentially backing off sleeps in
    between when a DBLockDeadlockError exception is raised.

    A 'max_retries' parameter may optionally be passed to prevent it
    from retrying forever (in which case the exception will be reraised).

        d = DB(...)
        d.open(...)
        DeadlockWrap(d.put, "foo", data="bar")  # set key "foo" to "bar"
    """
    sleeptime = _deadlock_MinSleepTime
    max_retries = _kwargs.get('max_retries', -1)
    if 'max_retries' in _kwargs:
        del _kwargs['max_retries']
    while True:
        try:
            return function(*_args, **_kwargs)
        except db.DBLockDeadlockError:
            if _deadlock_VerboseFile:
                _deadlock_VerboseFile.write(
                    'dbutils.DeadlockWrap: sleeping %1.3f\n' % sleeptime)
            _sleep(sleeptime)
            # exponential backoff in the sleep time
            sleeptime *= 2
            if sleeptime > _deadlock_MaxSleepTime:
                sleeptime = _deadlock_MaxSleepTime
            max_retries -= 1
            if max_retries == -1:
                raise


#------------------------------------------------------------------------

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