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Copy pathtransaction.py
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60 lines (44 loc) · 1.79 KB
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# Copyright 2019-2024 ObjectBox Ltd. All rights reserved.
#
# 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 objectbox.c import *
# Context managers as classes, not via @contextmanager: ~0.7 µs less overhead per transaction.
class _ReadTx:
__slots__ = ('_c_store', '_tx')
def __init__(self, store: 'Store'):
self._c_store = store._c_store
def __enter__(self):
self._tx = obx_txn_read(self._c_store)
def __exit__(self, exc_type, exc_value, traceback):
obx_txn_close(self._tx)
class _WriteTx:
__slots__ = ('_c_store', '_tx')
def __init__(self, store: 'Store'):
self._c_store = store._c_store
def __enter__(self):
self._tx = obx_txn_write(self._c_store)
def __exit__(self, exc_type, exc_value, traceback):
if exc_type is not None:
obx_txn_close(self._tx) # abort
return
try:
obx_txn_success(self._tx) # commit and close
except BaseException:
obx_txn_close(self._tx)
raise
def read(store: 'Store') -> _ReadTx:
"""Returns a context manager for a read transaction."""
return _ReadTx(store)
def write(store: 'Store') -> _WriteTx:
"""Returns a context manager for a write transaction; committed unless an exception is raised."""
return _WriteTx(store)