0.0.3 version

README.md

@@ -4,7 +4,7 @@ Objects
 Python catalogs of objects providers.
 
 
-Example:
+Example of objects catalog definition and usage:
 
 ```python
 """
@@ -16,12 +16,12 @@ import sqlite3
 
 
 # Some example classes.
-class A(object):
+class ObjectA(object):
     def __init__(self, db):
         self.db = db
 
 
-class B(object):
+class ObjectB(object):
     def __init__(self, a, db):
         self.a = a
         self.db = db
@@ -38,14 +38,14 @@ class AppCatalog(Catalog):
                          Attribute('row_factory', sqlite3.Row))
     """ :type: (objects.Provider) -> sqlite3.Connection """
 
-    object_a = NewInstance(A,
+    object_a = NewInstance(ObjectA,
                            InitArg('db', database))
-    """ :type: (objects.Provider) -> A """
+    """ :type: (objects.Provider) -> ObjectA """
 
-    object_b = NewInstance(B,
+    object_b = NewInstance(ObjectB,
                            InitArg('a', object_a),
                            InitArg('db', database))
-    """ :type: (objects.Provider) -> B """
+    """ :type: (objects.Provider) -> ObjectB """
 
 
 # Catalog injection into consumer class.
@@ -69,3 +69,91 @@ assert a1 is not a2
 assert b1 is not b2
 assert a1.db is a2.db is b1.db is b2.db
 ```
+
+Example of injections using objects.catalog:
+
+```python
+"""
+Concept example of objects injections.
+"""
+
+from objects import Catalog, Singleton, NewInstance, InitArg, Attribute, inject
+import sqlite3
+
+
+# Some example class.
+class ObjectA(object):
+    def __init__(self, db):
+        self.db = db
+
+
+# Catalog of objects providers.
+class AppCatalog(Catalog):
+    """
+    Objects catalog.
+    """
+
+    database = Singleton(sqlite3.Connection,
+                         InitArg('database', ':memory:'),
+                         Attribute('row_factory', sqlite3.Row))
+    """ :type: (objects.Provider) -> sqlite3.Connection """
+
+    object_a = NewInstance(ObjectA,
+                           InitArg('db', database))
+    """ :type: (objects.Provider) -> ObjectA """
+
+
+# Class attributes injections.
+@inject(Attribute('a', AppCatalog.object_a))
+@inject(Attribute('database', AppCatalog.database))
+class Consumer(object):
+    """
+    Some consumer class with database dependency via attribute.
+    """
+
+    a = None
+    """ :type: (objects.Provider) -> ObjectA """
+
+    database = None
+    """ :type: (objects.Provider) -> sqlite3.Connection """
+
+    def tests(self):
+        a1, a2 = self.a(), self.a()
+
+        assert a1 is not a2
+        assert a1.db is a2.db is self.database()
+
+
+consumer = Consumer()
+consumer.tests()
+
+
+# Class __init__ injections.
+@inject(InitArg('a1', AppCatalog.object_a))
+@inject(InitArg('a2', AppCatalog.object_a))
+@inject(InitArg('database', AppCatalog.database))
+class ConsumerWithInitArg(object):
+    """
+    Some consumer class with database dependency via init arg.
+    """
+
+    def __init__(self, a1, a2, database):
+        """
+        Initializer.
+
+        :param a1: ObjectA
+        :param a2: ObjectA
+        :param database: sqlite3.Connection
+        """
+        self.a1 = a1
+        self.a2 = a2
+        self.database = database
+
+    def tests(self):
+        assert self.a1 is not self.a2
+        assert self.a1.db is self.a2.db is self.database
+
+
+consumer = ConsumerWithInitArg()
+consumer.tests()
+```

VERSION

@@ -1 +1 @@
-0.0.2
+0.0.3

examples/concept.py

@@ -7,12 +7,12 @@ import sqlite3
 
 
 # Some example classes.
-class A(object):
+class ObjectA(object):
     def __init__(self, db):
         self.db = db
 
 
-class B(object):
+class ObjectB(object):
     def __init__(self, a, db):
         self.a = a
         self.db = db
@@ -29,14 +29,14 @@ class AppCatalog(Catalog):
                          Attribute('row_factory', sqlite3.Row))
     """ :type: (objects.Provider) -> sqlite3.Connection """
 
-    object_a = NewInstance(A,
+    object_a = NewInstance(ObjectA,
                            InitArg('db', database))
-    """ :type: (objects.Provider) -> A """
+    """ :type: (objects.Provider) -> ObjectA """
 
-    object_b = NewInstance(B,
+    object_b = NewInstance(ObjectB,
                            InitArg('a', object_a),
                            InitArg('db', database))
-    """ :type: (objects.Provider) -> B """
+    """ :type: (objects.Provider) -> ObjectB """
 
 
 # Catalog injection into consumer class.

examples/injections.py

@@ -0,0 +1,83 @@
+"""
+Concept example of objects injections.
+"""
+
+from objects import Catalog, Singleton, NewInstance, InitArg, Attribute, inject
+import sqlite3
+
+
+# Some example class.
+class ObjectA(object):
+    def __init__(self, db):
+        self.db = db
+
+
+# Catalog of objects providers.
+class AppCatalog(Catalog):
+    """
+    Objects catalog.
+    """
+
+    database = Singleton(sqlite3.Connection,
+                         InitArg('database', ':memory:'),
+                         Attribute('row_factory', sqlite3.Row))
+    """ :type: (objects.Provider) -> sqlite3.Connection """
+
+    object_a = NewInstance(ObjectA,
+                           InitArg('db', database))
+    """ :type: (objects.Provider) -> ObjectA """
+
+
+# Class attributes injections.
+@inject(Attribute('a', AppCatalog.object_a))
+@inject(Attribute('database', AppCatalog.database))
+class Consumer(object):
+    """
+    Some consumer class with database dependency via attribute.
+    """
+
+    a = None
+    """ :type: (objects.Provider) -> ObjectA """
+
+    database = None
+    """ :type: (objects.Provider) -> sqlite3.Connection """
+
+    def tests(self):
+        a1, a2 = self.a(), self.a()
+
+        assert a1 is not a2
+        assert a1.db is a2.db is self.database()
+
+
+consumer = Consumer()
+consumer.tests()
+
+
+# Class __init__ injections.
+@inject(InitArg('a1', AppCatalog.object_a))
+@inject(InitArg('a2', AppCatalog.object_a))
+@inject(InitArg('database', AppCatalog.database))
+class ConsumerWithInitArg(object):
+    """
+    Some consumer class with database dependency via init arg.
+    """
+
+    def __init__(self, a1, a2, database):
+        """
+        Initializer.
+
+        :param a1: ObjectA
+        :param a2: ObjectA
+        :param database: sqlite3.Connection
+        """
+        self.a1 = a1
+        self.a2 = a2
+        self.database = database
+
+    def tests(self):
+        assert self.a1 is not self.a2
+        assert self.a1.db is self.a2.db is self.database
+
+
+consumer = ConsumerWithInitArg()
+consumer.tests()

manage.py

@@ -0,0 +1,33 @@
+"""
+CLI Commands.
+"""
+
+import os
+from setup import version
+from manager import Manager
+
+
+manager = Manager()
+
+
+@manager.command
+def publish(with_tag=True):
+    """
+    Publishes current version to PyPi.
+    """
+    os.system('python setup.py sdist upload')
+    if with_tag:
+        tag()
+
+
+@manager.command
+def tag():
+    """
+    Makes tag from current version.
+    """
+    os.system('git tag -a {0} -m \'version {0}\''.format(version))
+    os.system('git push --tags')
+
+
+if __name__ == '__main__':
+    manager.main()

objects/__init__.py

@@ -3,9 +3,9 @@
 """
 
 from .catalog import Catalog
-from .std_providers import (Provider, NewInstance, Singleton, Class, Object,
+from .providers import (Provider, NewInstance, Singleton, Class, Object,
                         Function, Value)
-from .injections import InitArg, Attribute, Method
+from .injections import InitArg, Attribute, Method, inject
 
 
 __all__ = ['Catalog',
@@ -15,4 +15,4 @@ __all__ = ['Catalog',
            'Object', 'Function', 'Value',
 
            # Injections
-           'InitArg', 'Attribute', 'Method']
+           'InitArg', 'Attribute', 'Method', 'inject']

objects/catalog.py

@@ -2,7 +2,7 @@
 Catalog module.
 """
 
-from .std_providers import Provider
+from .providers import Provider
 
 
 class Catalog(object):

objects/injections.py

@@ -2,6 +2,9 @@
 Injections module.
 """
 
+from inspect import isclass
+from functools import wraps
+
 
 class Injection(object):
     """
@@ -15,14 +18,14 @@ class Injection(object):
         self.name = name
         self.injectable = injectable
 
-    @classmethod
-    def fetch(cls, injections):
+    @property
+    def value(self):
         """
-        Fetches injections of self type from list.
+        Returns injectable value.
         """
-        return tuple([injection
-                      for injection in injections
-                      if isinstance(injection, cls)])
+        if hasattr(self.injectable, '__is_objects_provider__'):
+            return self.injectable()
+        return self.injectable
 
 
 class InitArg(Injection):
@@ -41,3 +44,27 @@ class Method(Injection):
     """
     Method injection.
     """
+
+
+def inject(injection):
+    """
+    Injection decorator.
+    """
+    def decorator(callback_or_cls):
+        if isclass(callback_or_cls):
+            cls = callback_or_cls
+            if isinstance(injection, Attribute):
+                setattr(cls, injection.name, injection.injectable)
+            elif isinstance(injection, InitArg):
+                cls.__init__ = decorator(cls.__init__)
+            return cls
+        else:
+            callback = callback_or_cls
+
+            @wraps(callback)
+            def wrapped(*args, **kwargs):
+                if injection.name not in kwargs:
+                    kwargs[injection.name] = injection.value
+                return callback(*args, **kwargs)
+            return wrapped
+    return decorator

objects/providers.py

@@ -10,25 +10,29 @@ class Provider(object):
     Base provider class.
     """
 
+    __is_objects_provider__ = True
+
     def __call__(self, *args, **kwargs):
         """
         Returns provided instance.
         """
         raise NotImplementedError()
 
-    @staticmethod
+
 def prepare_injections(injections):
     """
     Prepares injections list to injection.
     """
-        prepared_injections = dict()
-        for injection in injections:
-            if isinstance(injection.injectable, Provider):
-                value = injection.injectable.__call__()
-            else:
-                value = injection.injectable
-            prepared_injections[injection.name] = value
-        return prepared_injections
+    return [(injection.name, injection.value) for injection in injections]
+
+
+def fetch_injections(injections, injection_type):
+    """
+    Fetches injections of injection type from list.
+    """
+    return tuple([injection
+                  for injection in injections
+                  if isinstance(injection, injection_type)])
 
 
 class NewInstance(Provider):
@@ -41,26 +45,26 @@ class NewInstance(Provider):
         Initializer.
         """
         self.provides = provides
-        self.init_injections = InitArg.fetch(injections)
-        self.attribute_injections = Attribute.fetch(injections)
-        self.method_injections = Method.fetch(injections)
+        self.init_injections = fetch_injections(injections, InitArg)
+        self.attribute_injections = fetch_injections(injections, Attribute)
+        self.method_injections = fetch_injections(injections, Method)
 
     def __call__(self, *args, **kwargs):
         """
         Returns provided instance.
         """
-        init_injections = Provider.prepare_injections(self.init_injections)
+        init_injections = prepare_injections(self.init_injections)
+        init_injections = dict(init_injections)
         init_injections.update(kwargs)
 
         provided = self.provides(*args, **init_injections)
 
-        attribute_injections = Provider.prepare_injections(
-            self.attribute_injections)
-        for name, injectable in attribute_injections.iteritems():
+        attribute_injections = prepare_injections(self.attribute_injections)
+        for name, injectable in attribute_injections:
             setattr(provided, name, injectable)
 
-        method_injections = Provider.prepare_injections(self.method_injections)
-        for name, injectable in method_injections.iteritems():
+        method_injections = prepare_injections(self.method_injections)
+        for name, injectable in method_injections:
             getattr(provided, name)(injectable)
 
         return provided

setup.py

@@ -2,8 +2,6 @@
 `Objects` setup script.
 """
 
-import os
-import sys
 from setuptools import setup
 
 
@@ -26,15 +24,8 @@ with open('requirements.txt') as version:
 with open('VERSION') as version:
     version = version.read().strip()
 
-# Helper commands.
-if sys.argv[-1] == 'publish':
-    os.system('python setup.py sdist upload')
-    sys.exit()
-if sys.argv[-1] == 'tag':
-    os.system('git tag -a {0} -m \'version {0}\''.format(version))
-    os.system('git push --tags')
-    sys.exit()
 
+if __name__ == '__main__':
     setup(
         name='Objects',
         version=version,