/usr/lib/python2.7/dist-packages/pymongo/cursor_manager.py is in python-pymongo 2.6.3-1build1.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""DEPRECATED - Different managers to handle when cursors are killed after
they are closed.
New cursor managers should be defined as subclasses of CursorManager and can be
installed on a connection by calling
`pymongo.connection.Connection.set_cursor_manager`.
.. versionchanged:: 2.1+
Deprecated.
"""
import weakref
class CursorManager(object):
"""The default cursor manager.
This manager will kill cursors one at a time as they are closed.
"""
def __init__(self, connection):
"""Instantiate the manager.
:Parameters:
- `connection`: a Mongo Connection
"""
self.__connection = weakref.ref(connection)
def close(self, cursor_id):
"""Close a cursor by killing it immediately.
Raises TypeError if cursor_id is not an instance of (int, long).
:Parameters:
- `cursor_id`: cursor id to close
"""
if not isinstance(cursor_id, (int, long)):
raise TypeError("cursor_id must be an instance of (int, long)")
self.__connection().kill_cursors([cursor_id])
class BatchCursorManager(CursorManager):
"""A cursor manager that kills cursors in batches.
"""
def __init__(self, connection):
"""Instantiate the manager.
:Parameters:
- `connection`: a Mongo Connection
"""
self.__dying_cursors = []
self.__max_dying_cursors = 20
self.__connection = weakref.ref(connection)
CursorManager.__init__(self, connection)
def __del__(self):
"""Cleanup - be sure to kill any outstanding cursors.
"""
self.__connection().kill_cursors(self.__dying_cursors)
def close(self, cursor_id):
"""Close a cursor by killing it in a batch.
Raises TypeError if cursor_id is not an instance of (int, long).
:Parameters:
- `cursor_id`: cursor id to close
"""
if not isinstance(cursor_id, (int, long)):
raise TypeError("cursor_id must be an instance of (int, long)")
self.__dying_cursors.append(cursor_id)
if len(self.__dying_cursors) > self.__max_dying_cursors:
self.__connection().kill_cursors(self.__dying_cursors)
self.__dying_cursors = []
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