代码学习

Author: linsicai

patterns/structural/3-tier.py

@@ -3,7 +3,14 @@
 Separates presentation, application processing, and data management functions.
 """
 
+# 3层
+# 数据层、应用层、表现层
+# 数据层管数据如何存储
+# 应用层管api
+# 表现层关如何展示数据
 
+
+# 数据层
 class Data:
     """ Data Store Class """
 
@@ -17,7 +24,7 @@ def __get__(self, obj, klas):
         print("(Fetching from Data Store)")
         return {'products': self.products}
 
-
+# 业务层
 class BusinessLogic:
     """ Business logic holding data store instances """
 
@@ -29,7 +36,7 @@ def product_list(self):
     def product_information(self, product):
         return self.data['products'].get(product, None)
 
-
+# 表现层
 class Ui:
     """ UI interaction class """
 
@@ -38,12 +45,14 @@ def __init__(self):
 
     def get_product_list(self):
         print('PRODUCT LIST:')
+
         for product in self.business_logic.product_list():
             print(product)
         print('')
 
     def get_product_information(self, product):
         product_info = self.business_logic.product_information(product)
+
         if product_info:
             print('PRODUCT INFORMATION:')
             print(

patterns/structural/adapter.py

@@ -28,6 +28,8 @@
 Allows the interface of an existing class to be used as another interface.
 """
 
+# 适配模式：已有很多类，类似但不统一，加个适配类
+# 实现：设置函数映射表
 
 class Dog:
     def __init__(self):

patterns/structural/bridge.py

@@ -6,6 +6,8 @@
 Decouples an abstraction from its implementation.
 """
 
+# 已有多个统一格式的类，使用方选一个使用，可以搭个桥连接起来
+# 实现：接口类
 
 # ConcreteImplementor 1/2
 class DrawingAPI1:

patterns/structural/composite.py

@@ -26,27 +26,34 @@
 Describes a group of objects that is treated as a single instance.
 """
 
+# 定义了标准，各有各的实现，但又有组合的需求时，画图里面使用比较多
+# 实现：抽象类+实现类+组合类
 
+# 抽象组件
 class Graphic:
+    # 定义需要实现的函数
     def render(self):
         raise NotImplementedError("You should implement this.")
 
 
+# 合成组件
 class CompositeGraphic(Graphic):
     def __init__(self):
         self.graphics = []
 
+    // 合成组件渲染
     def render(self):
         for graphic in self.graphics:
             graphic.render()
 
+    # 增加与删除组件
     def add(self, graphic):
         self.graphics.append(graphic)
-
     def remove(self, graphic):
         self.graphics.remove(graphic)
 
 
+# 椭圆
 class Ellipse(Graphic):
     def __init__(self, name):
         self.name = name

patterns/structural/decorator.py

@@ -24,7 +24,10 @@
 Adds behaviour to object without affecting its class.
 """
 
+# 装饰器，拿到原文后，需要装饰一下，如加粗、斜体等
+# 实现：拿到原文后，再处理一把
 
+# 文本
 class TextTag:
     """Represents a base text tag"""
 
@@ -34,7 +37,7 @@ def __init__(self, text):
     def render(self):
         return self._text
 
-
+# 粗体
 class BoldWrapper(TextTag):
     """Wraps a tag in <b>"""
 
@@ -44,7 +47,7 @@ def __init__(self, wrapped):
     def render(self):
         return "<b>{}</b>".format(self._wrapped.render())
 
-
+# 斜体
 class ItalicWrapper(TextTag):
     """Wraps a tag in <i>"""
 

patterns/structural/facade.py

@@ -28,6 +28,9 @@
 Provides a simpler unified interface to a complex system.
 """
 
+# 门面模式
+# 有很多组件，需要组合运行，内部流程可能很复杂，封装成简单的接口
+# 实现：多个组件+管理类
 
 # Complex computer parts
 class CPU:

patterns/structural/front_controller.py

@@ -5,17 +5,21 @@
 Provides a centralized entry point that controls and manages request handling.
 """
 
+# 前端控制器
+# 将特定请求分配到请求分配器上，分配器根据请求做不同操作
 
+
+# 手机视图
 class MobileView:
     def show_index_page(self):
         print('Displaying mobile index page')
 
-
+# 表视图
 class TabletView:
     def show_index_page(self):
         print('Displaying tablet index page')
 
-
+# 分配器
 class Dispatcher:
     def __init__(self):
         self.mobile_view = MobileView()
@@ -29,7 +33,7 @@ def dispatch(self, request):
         else:
             print('cant dispatch the request')
 
-
+# 请求控制器
 class RequestController:
     """ front controller """
 

patterns/structural/mvc.py

@@ -3,7 +3,12 @@
 Separates data in GUIs from the ways it is presented, and accepted.
 """
 
+# model，存储数据
+# view，基于模型api，写视图
+# 控制器，不同模型不同视图
 
+
+# 模型
 class Model:
     def __iter__(self):
         raise NotImplementedError
@@ -18,6 +23,7 @@ def item_type(self):
         raise NotImplementedError
 
 
+# 产品模型
 class ProductModel(Model):
     class Price(float):
         """A polymorphic way to pass a float with a particular
@@ -44,7 +50,7 @@ def get(self, product):
         except KeyError as e:
             raise KeyError(str(e) + " not in the model's item list.")
 
-
+# 抽象视图
 class View:
     def show_item_list(self, item_type, item_list):
         raise NotImplementedError
@@ -58,6 +64,7 @@ def item_not_found(self, item_type, item_name):
         raise NotImplementedError
 
 
+# 终端视图
 class ConsoleView(View):
     def show_item_list(self, item_type, item_list):
         print(item_type.upper() + ' LIST:')
@@ -80,7 +87,7 @@ def show_item_information(self, item_type, item_name, item_info):
     def item_not_found(self, item_type, item_name):
         print('That {} "{}" does not exist in the records'.format(item_type, item_name))
 
-
+# 控制器，有模型和视图
 class Controller:
     def __init__(self, model, view):
         self.model = model

patterns/structural/proxy.py

@@ -15,7 +15,10 @@
 without changing its interface.
 """
 
+# 通过代理模式去使用最终类，中途可以做很多事
 
+
+# 订阅接口
 class Subject:
     """
     As mentioned in the document, interfaces of both RealSubject and Proxy should
@@ -29,7 +32,7 @@ class Subject:
     def do_the_job(self, user):
         raise NotImplementedError()
 
-
+# 订阅实现
 class RealSubject(Subject):
     """
     This is the main job doer. External services like payment gateways can be a
@@ -39,7 +42,7 @@ class RealSubject(Subject):
     def do_the_job(self, user):
         print(f'I am doing the job for {user}')
 
-
+# 代理
 class Proxy(Subject):
     def __init__(self):
         self._real_subject = RealSubject()