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52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
"""
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验证并发构造时的单例身份与初始化次数。
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"""
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import threading
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from app.foundation.singleton import Singleton, SingletonClass
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def _construct_concurrently(singleton_type, count: int = 16):
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"""
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让多个线程同时越过起跑线，放大首次构造竞态。
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"""
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barrier = threading.Barrier(count)
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instances = []
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def construct() -> None:
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barrier.wait()
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instances.append(singleton_type())
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threads = [threading.Thread(target=construct) for _ in range(count)]
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for thread in threads:
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thread.start()
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for thread in threads:
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thread.join(timeout=5)
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assert not thread.is_alive()
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return instances
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def test_parameterized_singleton_first_construction_is_single_flight():
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"""
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同一参数的并发首次构造只能发布一个完整实例。
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"""
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class _ParameterizedSingleton(metaclass=Singleton):
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pass
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instances = _construct_concurrently(_ParameterizedSingleton)
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assert len({id(instance) for instance in instances}) == 1
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def test_class_singleton_first_construction_is_single_flight():
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"""
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按类单例的并发首次构造只能发布一个完整实例。
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"""
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class _ClassSingleton(metaclass=SingletonClass):
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pass
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instances = _construct_concurrently(_ClassSingleton)
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assert len({id(instance) for instance in instances}) == 1
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