Rename provider ExternalDependency -> Dependency

src/dependency_injector/providers.pxd

@@ -25,10 +25,14 @@ cdef class Delegate(Object):
     pass
 
 
-cdef class ExternalDependency(Provider):
+cdef class Dependency(Provider):
     cdef type __instance_of
 
 
+cdef class ExternalDependency(Dependency):
+    pass
+
+
 cdef class OverridingContext(object):
     cdef Provider __overridden
     cdef Provider __overriding

src/dependency_injector/providers.pyx

@@ -295,8 +295,8 @@ cdef class Delegate(Object):
         super(Delegate, self).__init__(ensure_is_provider(provides))
 
 
-cdef class ExternalDependency(Provider):
+cdef class Dependency(Provider):
-    """:py:class:`ExternalDependency` provider describes dependency interface.
+    """:py:class:`Dependency` provider describes dependency interface.
 
     This provider is used for description of dependency interface. That might
     be useful when dependency could be provided in the client's code only,
@@ -305,7 +305,7 @@ cdef class ExternalDependency(Provider):
 
     .. code-block:: python
 
-        database_provider = ExternalDependency(sqlite3.dbapi2.Connection)
+        database_provider = Dependency(sqlite3.dbapi2.Connection)
         database_provider.override(Factory(sqlite3.connect, ':memory:'))
 
         database = database_provider()
@@ -315,12 +315,12 @@ cdef class ExternalDependency(Provider):
         Class of required dependency.
 
         :type: type
-    """
+   """
 
-    def __init__(self, type instance_of):
+    def __init__(self, type instance_of=object):
         """Initializer."""
         self.__instance_of = instance_of
-        super(ExternalDependency, self).__init__()
+        super(Dependency, self).__init__()
 
     def __deepcopy__(self, memo):
         """Create and return full copy of provider."""
@@ -391,6 +391,33 @@ cdef class ExternalDependency(Provider):
         return self.override(provider)
 
 
+cdef class ExternalDependency(Dependency):
+    """:py:class:`ExternalDependency` provider describes dependency interface.
+
+    This provider is used for description of dependency interface. That might
+    be useful when dependency could be provided in the client's code only,
+    but it's interface is known. Such situations could happen when required
+    dependency has non-determenistic list of dependencies itself.
+
+    .. code-block:: python
+
+        database_provider = ExternalDependency(sqlite3.dbapi2.Connection)
+        database_provider.override(Factory(sqlite3.connect, ':memory:'))
+
+        database = database_provider()
+
+    .. deprecated:: 3.9
+
+        Use :py:class:`Dependency` instead.
+
+    .. py:attribute:: instance_of
+
+        Class of required dependency.
+
+        :type: type
+    """
+
+
 cdef class OverridingContext(object):
     """Provider overriding context.
 

tests/unit/providers/test_base.py

@@ -229,13 +229,13 @@ class DelegateTests(unittest.TestCase):
                              hex(id(self.delegate))))
 
 
-class ExternalDependencyTests(unittest.TestCase):
+class DependencyTests(unittest.TestCase):
 
     def setUp(self):
-        self.provider = providers.ExternalDependency(instance_of=list)
+        self.provider = providers.Dependency(instance_of=list)
 
     def test_init_with_not_class(self):
-        self.assertRaises(TypeError, providers.ExternalDependency, object())
+        self.assertRaises(TypeError, providers.Dependency, object())
 
     def test_is_provider(self):
         self.assertTrue(providers.is_provider(self.provider))
@@ -252,15 +252,15 @@ class ExternalDependencyTests(unittest.TestCase):
         self.assertRaises(errors.Error, self.provider)
 
     def test_deepcopy(self):
-        provider = providers.ExternalDependency(int)
+        provider = providers.Dependency(int)
 
         provider_copy = providers.deepcopy(provider)
 
         self.assertIsNot(provider, provider_copy)
-        self.assertIsInstance(provider, providers.ExternalDependency)
+        self.assertIsInstance(provider, providers.Dependency)
 
     def test_deepcopy_from_memo(self):
-        provider = providers.ExternalDependency(int)
+        provider = providers.Dependency(int)
         provider_copy_memo = providers.Provider()
 
         provider_copy = providers.deepcopy(
@@ -269,7 +269,7 @@ class ExternalDependencyTests(unittest.TestCase):
         self.assertIs(provider_copy, provider_copy_memo)
 
     def test_deepcopy_overridden(self):
-        provider = providers.ExternalDependency(int)
+        provider = providers.Dependency(int)
         overriding_provider = providers.Provider()
 
         provider.override(overriding_provider)
@@ -278,7 +278,7 @@ class ExternalDependencyTests(unittest.TestCase):
         overriding_provider_copy = provider_copy.overridden[0]
 
         self.assertIsNot(provider, provider_copy)
-        self.assertIsInstance(provider, providers.ExternalDependency)
+        self.assertIsInstance(provider, providers.Dependency)
 
         self.assertIsNot(overriding_provider, overriding_provider_copy)
         self.assertIsInstance(overriding_provider_copy, providers.Provider)
@@ -286,6 +286,15 @@ class ExternalDependencyTests(unittest.TestCase):
     def test_repr(self):
         self.assertEqual(repr(self.provider),
                          '<dependency_injector.providers.'
-                         'ExternalDependency({0}) at {1}>'.format(
+                         'Dependency({0}) at {1}>'.format(
                              repr(list),
                              hex(id(self.provider))))
+
+
+class ExternalDependencyTests(unittest.TestCase):
+
+    def setUp(self):
+        self.provider = providers.ExternalDependency(instance_of=list)
+
+    def test_is_instance(self):
+        self.assertIsInstance(self.provider, providers.Dependency)