5de514f1f8
Introduces a new threading backend for oslo.service that provides a complete alternative to the eventlet-based backend. This backend includes: • A ThreadGroup and Thread implementation using the Python threading module. • A reimplementation of all looping call utilities ( FixedIntervalLoopingCall, DynamicLoopingCall, etc.) using threading.Event and futurist.ThreadPoolExecutor. • A service management layer based on cotyledon, including Service,ServiceWrapper, Launcher, and ProcessLauncher. • A new ThreadingBackend class that exposes all components needed for integration into oslo.service. This change provides a robust and eventlet-free alternative backend while maintaining API compatibility. Change-Id: Ia7518401ccdcc28afbffd4ffe5c3b772f3617001
27 lines
971 B
Python
27 lines
971 B
Python
# Copyright (C) 2025 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_concurrency import lockutils
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class Singleton(type):
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_instances = {}
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_semaphores = lockutils.Semaphores()
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def __call__(cls, *args, **kwargs):
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with lockutils.lock('singleton_lock', semaphores=cls._semaphores):
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if cls not in cls._instances:
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cls._instances[cls] = super().__call__(*args, **kwargs)
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return cls._instances[cls]
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