from core.sheerka.Sheerka import Sheerka

from tests.BaseTest import BaseTest


class TestUsingMemoryBasedSheerka(BaseTest):
    singleton_instance = None
    dump = None

    @staticmethod
    def _inner_get_sheerka(cache_only):
        sheerka = Sheerka(cache_only=cache_only)
        sheerka.initialize("mem://", save_execution_context=False)
        return sheerka

    def get_sheerka(self, **kwargs):
        cache_only = kwargs.get("cache_only", True)
        use_singleton = kwargs.get("singleton", True)

        sheerka = kwargs.get("sheerka", None)
        if sheerka:
            return sheerka

        if use_singleton:
            singleton_instance = TestUsingMemoryBasedSheerka.singleton_instance
            if singleton_instance:
                singleton_instance.reset(cache_only)
                singleton_instance.cache_manager.init_from(TestUsingMemoryBasedSheerka.dump)
                return singleton_instance
            else:
                new_instance = self._inner_get_sheerka(cache_only)
                TestUsingMemoryBasedSheerka.dump = new_instance.cache_manager.dump()
                TestUsingMemoryBasedSheerka.singleton_instance = new_instance
                return TestUsingMemoryBasedSheerka.singleton_instance

        return self._inner_get_sheerka(cache_only)