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Implement lazy initialization and improve copying for Delegate provider

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Roman Mogylatov 2021-03-07 11:22:36 -05:00
parent 9202ad05a7
commit 3e03b9315e
4 changed files with 6213 additions and 6197 deletions
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12379
src/dependency_injector/providers.c
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2
src/dependency_injector/providers.pyi
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@ -94,7 +94,7 @@ class Delegate(Provider[Provider]):
def __init__(self, provides: Optional[Provider] = None) -> None: ... def __init__(self, provides: Optional[Provider] = None) -> None: ...
@property @property
def provides(self) -> Optional[Provider]: ... def provides(self) -> Optional[Provider]: ...
def set_provides(self, provides: Optional[Provider]): ... def set_provides(self, provides: Optional[Provider]) -> Delegate: ...
class Dependency(Provider[T]): class Dependency(Provider[T]):

19
src/dependency_injector/providers.pyx
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@ -520,11 +520,7 @@ cdef class Delegate(Provider):
""" """
def __init__(self, provides=None): def __init__(self, provides=None):
"""Initializer. """Initialize provider."""
:param provides: Value that have to be provided.
:type provides: :py:class:`Provider`
"""
self.__provides = None self.__provides = None
self.set_provides(provides) self.set_provides(provides)
super(Delegate, self).__init__() super(Delegate, self).__init__()
@ -535,11 +531,13 @@ cdef class Delegate(Provider):
if copied is not None: if copied is not None:
return copied return copied
copied = self.__class__() provides = self.provides
memo[id(self)] = copied if provides:
provides = deepcopy(self.provides, memo)
copied = _memorized_duplicate(self, memo)
copied.set_provides(provides)
if self.provides:
copied.set_provides(deepcopy(self.provides, memo))
self._copy_overridings(copied, memo) self._copy_overridings(copied, memo)
return copied return copied
@ -560,12 +558,15 @@ cdef class Delegate(Provider):
@property @property
def provides(self): def provides(self):
"""Return provider's provides."""
return self.__provides return self.__provides
def set_provides(self, provides): def set_provides(self, provides):
"""Set provider's provides."""
if provides: if provides:
provides = ensure_is_provider(provides) provides = ensure_is_provider(provides)
self.__provides = provides self.__provides = provides
return self
@property @property
def related(self): def related(self):

10
tests/unit/providers/test_base_py2_py3.py
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@ -291,6 +291,16 @@ class DelegateTests(unittest.TestCase):
def test_is_provider(self): def test_is_provider(self):
self.assertTrue(providers.is_provider(self.delegate)) self.assertTrue(providers.is_provider(self.delegate))
def test_init_optional_provides(self):
provider = providers.Delegate()
provider.set_provides(self.delegated)
self.assertIs(provider.provides, self.delegated)
self.assertIs(provider(), self.delegated)
def test_set_provides_returns_self(self):
provider = providers.Delegate()
self.assertIs(provider.set_provides(self.delegated), provider)
def test_init_with_not_provider(self): def test_init_with_not_provider(self):
self.assertRaises(errors.Error, providers.Delegate, object()) self.assertRaises(errors.Error, providers.Delegate, object())