diff --git a/LICENSE.txt b/LICENSE.txt
deleted file mode 100644
index f584954..0000000
--- a/LICENSE.txt
+++ /dev/null
@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) [2020] [Reza Mobaraki] | MR.Rezoo
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
\ No newline at end of file
diff --git a/src/factory2.py b/src/factory2.py
index 46e4eb0..5631dfb 100644
--- a/src/factory2.py
+++ b/src/factory2.py
@@ -1,40 +1,54 @@
"""
- Creational:
- Factory method
- 3 Component => 1.Creator, 2.Product, 3.Client
+ Factory
+ - Factory is a creational design pattern that provides an interface for creating objects
+ in a superclass, but allows subclasses to alter the type of objects that will be created.
+
+ 3 component => 1. creator, 2. product, 3. client
"""
-from abc import abstractmethod
+from abc import ABC, abstractmethod
-class File:
- def __init__(self, name, file_format):
- self.name = name
- self.file_format = file_format
+class File(ABC): # creator
+ def __init__(self, file):
+ self.file = file
+ @abstractmethod
+ def make(self):
+ pass
-class B:
+ def call_edit(self):
+ product = self.make()
+ result = product.edit(self.file)
+ return result
- def edit(self, file): # client
- return self._get_edit(file)
- def _get_edit(self, file): # creator
- if file.file_format == 'json': # identifier
- return self.json_edit(file)
- elif file.file_format == 'xml': # identifier
- return self.xml_edit(file)
- else:
- raise ValueError("So Sorry. . .")
+class JsonFile(File): # creator
+ def make(self):
+ return Json()
- @abstractmethod
- def json_edit(self, file): # product
- print(f"Editing Json File. . . {file.name}")
- @abstractmethod
- def xml_edit(self, file): # product
- print(f"Editing Xml File. . . {file.name}")
+class XmlFile(File): # creator
+ def make(self):
+ return Xml()
+
+
+class Json: # product
+ def edit(self, file):
+ return f'Working on {file} Json...'
+
+
+class Xml: # product
+ def edit(self, file):
+ return f'Working on {file} Xml...'
+
+
+def client(file, format): # client
+ formats = {
+ 'json': JsonFile,
+ 'xml': XmlFile
+ }
+ result = formats[format](file)
+ return result.call_edit()
-if __name__ == '__main__':
- first_file = File('first', 'xml')
- b1 = B()
- b1.edit(first_file)
+print(client('show', 'xml'))
diff --git a/src/singleton2.py b/src/singleton2.py
index 2189d37..23a2b39 100644
--- a/src/singleton2.py
+++ b/src/singleton2.py
@@ -4,7 +4,7 @@
"""
-class Singleton(type):
+class Singleton1(type):
_instance = None
def __call__(cls, *args, **kwargs):
@@ -13,17 +13,36 @@ def __call__(cls, *args, **kwargs):
return cls._instance
-class DB(metaclass=Singleton):
+class Singleton2(type):
+ """
+ Singleton metaclass
+ Based on Python Cookbook 3rd Edition Recipe 9.13
+ Only one instance of a class can exist. Does not work with __slots__
+ """
+
+ def __init__(self, *args, **kw):
+ super(Singleton2, self).__init__(*args, **kw)
+ self.__instance = None
+
+ def __call__(self, *args, **kw):
+ if self.__instance is None:
+ self.__instance = super(Singleton2, self).__call__(*args, **kw)
+ return self.__instance
+
+
+class DBMongo(metaclass=Singleton2):
+ pass
+
+class DBPostgres(metaclass=Singleton2):
pass
if __name__ == '__main__':
- s1 = DB()
- s2 = DB()
- s3 = DB()
+ m1 = DBMongo()
+ m2 = DBMongo()
- print(id(s1))
- print(id(s2))
- print(id(s3))
+ p1 = DBPostgres()
+ p2 = DBPostgres()
- print(id(s1) == id(s2) == id(s3))
+ print(f"Mongo: {id(m1)} - {id(m2)} ", id(m1) == id(m2))
+ print(f"Postgres: {id(p1)} - {id(p2)} ", id(p1) == id(p2))
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