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# -*- coding: utf-8 -*-
"""
cupoftee.db
~~~~~~~~~~~
A simple object database. As long as the server is not running in
multiprocess mode that's good enough.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
from pickle import dumps
from pickle import loads
from threading import Lock
try:
import dbm
except ImportError:
import anydbm as dbm
class Database(object):
def __init__(self, filename):
self.filename = filename
self._fs = dbm.open(filename, "cf")
self._local = {}
self._lock = Lock()
def __getitem__(self, key):
with self._lock:
return self._load_key(key)
def _load_key(self, key):
if key in self._local:
return self._local[key]
rv = loads(self._fs[key])
self._local[key] = rv
return rv
def __setitem__(self, key, value):
self._local[key] = value
def __delitem__(self, key):
with self._lock:
self._local.pop(key, None)
if key in self._fs:
del self._fs[key]
def __del__(self):
self.close()
def __contains__(self, key):
with self._lock:
try:
self._load_key(key)
except KeyError:
pass
return key in self._local
def setdefault(self, key, factory):
with self._lock:
try:
rv = self._load_key(key)
except KeyError:
self._local[key] = rv = factory()
return rv
def sync(self):
with self._lock:
for key, value in self._local.items():
self._fs[key] = dumps(value, 2)
self._fs.sync()
def close(self):
try:
self.sync()
self._fs.close()
except Exception:
pass
|
