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How to use singleton_factory method in localstack

Best Python code snippet using localstack_python

test_objects.py

Source:test_objects.py

1from unittest.mock import MagicMock2import pytest3from localstack.utils.objects import SubtypesInstanceManager, singleton_factory4def test_subtypes_instance_manager():5    class BaseClass(SubtypesInstanceManager):6        def foo(self):7            pass8    class C1(BaseClass):9        @staticmethod10        def impl_name() -> str:11            return "c1"12        def foo(self):13            return "bar"14    instance1 = BaseClass.get("c1")15    assert instance116    assert BaseClass.get("c1") == instance117    assert instance1.foo() == "bar"18    with pytest.raises(Exception):19        assert BaseClass.get("c2")20    class C2(BaseClass):21        @staticmethod22        def impl_name() -> str:23            return "c2"24        def foo(self):25            return "baz"26    instance2 = BaseClass.get("c2")27    assert BaseClass.get("c2") == instance228    assert instance2.foo() == "baz"29class TestSingletonFactory:30    def test_call_and_clear(self):31        mock = MagicMock()32        mock.return_value = "foobar"33        @singleton_factory34        def my_singleton():35            return mock()36        assert my_singleton() == mock.return_value37        mock.assert_called_once()38        assert my_singleton() == mock.return_value39        mock.assert_called_once()40        my_singleton.clear()41        assert my_singleton() == mock.return_value42        mock.assert_has_calls([(), ()])43        assert my_singleton() == mock.return_value44        mock.assert_has_calls([(), ()])45    def test_exception_does_not_set_a_value(self):46        mock = MagicMock()47        @singleton_factory48        def my_singleton():49            mock()50            raise ValueError("oh noes")51        with pytest.raises(ValueError):52            my_singleton()53        mock.assert_has_calls([()])54        with pytest.raises(ValueError):55            my_singleton()56        mock.assert_has_calls([(), ()])57    def test_set_none_value_does_not_set_singleton(self):58        mock = MagicMock()59        mock.return_value = None60        @singleton_factory61        def my_singleton():62            return mock()63        assert my_singleton() is None64        mock.assert_has_calls([()])65        assert my_singleton() is None66        mock.assert_has_calls([(), ()])67    def test_set_falsy_value_sets_singleton(self):68        mock = MagicMock()69        mock.return_value = False70        @singleton_factory71        def my_singleton():72            return mock()73        assert my_singleton() is False74        mock.assert_called_once()75        assert my_singleton() is False...

singleton_decorator.py

Source:singleton_decorator.py

...18    ...class Demo:19    ...     pass20    """21    _set_singleton_instance(original_class)22    def singleton_factory(cls):23        return singletons[original_class]24    original_class._instance_factory = classmethod(singleton_factory)25    return original_class26def _set_singleton_instance(original_class):27    lock.acquire()28    if original_class not in singletons:29        singletons[original_class] = original_class()...

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