Source code for pyqldb.util.atomic_integer
# Copyright 2019 Amazon.com, Inc. or its affiliates. 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. A copy of the License is located at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# or in the "license" file accompanying this file. This file 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 threading import Lock
[docs]class AtomicInteger:
"""
An integer value that may be updated atomically.
"""
def __init__(self, value=0):
self._value = value
self._lock = Lock()
[docs] def increment(self):
"""
Atomically increments the current value by one.
:rtype: int
:return: The updated integer value.
"""
with self._lock:
self._value += 1
return self._value
[docs] def decrement(self):
"""
Atomically decrements the current value by one.
:rtype: int
:return: The updated integer value.
"""
with self._lock:
self._value -= 1
return self._value
@property
def value(self):
"""
Returns the current value.
:rtype: int
:return: The integer value.
"""
with self._lock:
return self._value