MatrixSynapse/synapse/replication/slave/storage/_slaved_id_tracker.py

36 lines
1.2 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
#
# 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.
from synapse.storage.util.id_generators import _load_current_id
class SlavedIdTracker(object):
def __init__(self, db_conn, table, column, extra_tables=[], step=1):
self.step = step
self._current = _load_current_id(db_conn, table, column, step)
for table, column in extra_tables:
self.advance(_load_current_id(db_conn, table, column))
def advance(self, new_id):
self._current = (max if self.step > 0 else min)(self._current, new_id)
def get_current_token(self):
"""
Returns:
int
"""
return self._current