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class _iter_mixin(UserDict.DictMixin):
def _make_iter_cursor(self):
cur = self.db.cursor()
key = id(cur)
self._cursor_refs[key] = ref(cur, self._gen_cref_cleaner(key))
return cur
def _gen_cref_cleaner(self, key):
# use generate the function for the weakref callback here
# to ensure that we do not hold a strict reference to cur
# in the callback.
return lambda ref: self._cursor_refs.pop(key, None)
def __iter__(self):
try:
cur = self._make_iter_cursor()
# FIXME-20031102-greg: race condition. cursor could
# be closed by another thread before this call.
# since we're only returning keys, we call the cursor
# methods with flags=0, dlen=0, dofs=0
key = cur.first(0,0,0)[0]
yield key
next = cur.next
while 1:
try:
key = next(0,0,0)[0]
yield key
except _bsddb.DBCursorClosedError:
cur = self._make_iter_cursor()
# FIXME-20031101-greg: race condition. cursor could
# be closed by another thread before this call.
cur.set(key,0,0,0)
next = cur.next
except _bsddb.DBNotFoundError:
return
except _bsddb.DBCursorClosedError:
# the database was modified during iteration. abort.
return
def iteritems(self):
try:
try:
cur = self._make_iter_cursor()
except AttributeError:
return
# FIXME-20031102-greg: race condition. cursor could
# be closed by another thread before this call.
kv = cur.first()
key = kv[0]
yield kv
next = cur.next
while 1:
try:
kv = next()
key = kv[0]
yield kv
except _bsddb.DBCursorClosedError:
cur = self._make_iter_cursor()
# FIXME-20031101-greg: race condition. cursor could
# be closed by another thread before this call.
cur.set(key,0,0,0)
next = cur.next
except _bsddb.DBNotFoundError:
return
except _bsddb.DBCursorClosedError:
# the database was modified during iteration. abort.
return
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A simple wrapper around DB that makes it look like the bsddbobject in
the old module. It uses a cursor as needed to provide DB traversal.
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