etl design patterns

Six principles of design patterns (3) -- six principles of dependency inversion and Design Patterns Definition: High-level modules should not depend on low-level modules. Both of them should depend on abstract interfaces. Abstract interfaces should not depend on specific implementations. The specific implementation dep

Highlights of design patterns (I) and highlights of design patterns The main document of the design pattern is "big talk Design Pattern". In the first stage, we will first look at the basic concepts of various

Learning JavaScript design patterns: singleton and javascript Design Patterns I. Definition Ensure that a class has only one instance and provides a global access point to it.When you click the login button, a login floating window appears on the page, which is unique. No matter how many login buttons are clicked, this

The following 23 design patterns are mentioned in the design pattern book:Abstractfactory: Provides an interface to create a series of related or interdependent objects without specifying their specific classes.Adapter: Transforms the interface of a class into another interface that the customer wants. The adapter mode makes it possible for those classes that wou

the parent class, the post-condition (that is, the return value of the method) of the method is stricter than that of the parent class; Dependency inversion principle: Invert dependency to dependency Interface Upper-layer modules should not depend on lower-layer modules. They all depend on an abstraction; Parent classes cannot depend on child classes. They all depend on abstract classes; Abstraction cannot depend on or depend on abstraction; Interface isolation principle: The dependence of a

One of cainiao's design patterns is thought preparation and cainiao's Design Patterns As a cainiao, we always want to become a big bull one day. In fact, we have this idea. This shows that we are a group of progressive children. First of all, I used the most common method in the previous column. It was the code wri

Learn design patterns with me (-) and design patterns. Learn the design mode with me (-). learn the design mode. today we will study the Singleton mode together: to learn a model, we always need to know the application scenario. O

Before understanding the differences, let's look at how the design patterns work and make better use of one of the two (MVC design and MVP. The (MVC design and MVP) model has been used for several years. A key problem to be solved is the main focus of object-oriented, separated user interfaces and business layers. Ther

So far, I have finished learning several design patterns of the created model. Let's take a look at them. It takes a short time. It is better to create a model that is relatively simple and will not be so smooth in the future. since there is no real practice in the project, so far, I think I have not mastered it, just a little understanding of the design model.

Object-oriented Thinking of design patterns, design patterns OO [This article is my own learning notes. You are welcome to repost it, but please note the Source: http://blog.csdn.net/jesson20121020] Object-oriented (OO) thinking: 1. Consider classes Term2. Consider attributes Cannot be separated from the specific app

Design patterns can be divided into three types depending on the type of use:1. creation mode : Factory (Factory mode), Singleton (single State), Builder ((builder mode), Prototype (prototype mode), factory method mode.2. structure mode : Flyweight (Shared mode), Bridge (bridge mode), Decorator ((decorative mode), Composite ((combo mode), Adapter (adapter mode), Proxy (proxy mode), facade (appearance mode).

23 design patterns (21) java meta-mode and 23 Design Patterns Dr. Yan Hong's book "JAVA and patterns" describes the Flyweight mode as follows: In boxing, Flyweight refers to the most lightweight model, that is, "Fly magnitude" or "rainfall level". Here we use the free transl

Python design patterns, python Design Patterns This article describes common python design patterns. We will share this with you for your reference. The details are as follows: ##! /Usr/bin/env python ###-*-coding: UTF-8 ## class

Summary of design patterns in Objective-C, and objectivec Design Patterns This article summarizes the use of the design patterns listed in Gang of Four in Objective-C from five dimensions: name, definition, when to use, UML diagra

Template design patterns are mainly derived from the life of some things are template can be followed. Give two examples of life, such as tea and coffee, and take a look.Tea has the following four steps: 1, boiled water; 2 Put the tea in the Water Cup; 3, pour boiling water; 4, add sugar.Brewed coffee also has the following four steps: 1, boil water; 2 Put the coffee in the Water Cup; 3, pour boiling water;

Common iOS design patterns-singleton Design PatternsDetailed description of Singleton Design Mode Basic concepts of Singleton Design Patterns in IOS when Singleton mode is used, basic steps for creating Singleton mode in a non-ARC

Learning JavaScript design patterns: class inheritance and javascript Design Patterns Before doing one thing, you must first understand the benefits of doing this thing, and believe that no one is willing to do things for no reason. In general, when designing a class, we actually want to reduce repetitive code and use

Java multi-thread 12 design patterns, java multi-thread design patterns 1. Single Threaded Execution Pattern (Single-thread Execution Mode) 2. Immutable Pattern (Immutable Mode) 3. Guarded Suspension Pattern (Defense pause Mode) 4. Balking Pattern (stop mode, stop mode) 5. Producer-Consumer Pattern (Producer-Consu

type T, and the return value of the same method (overloaded or overridden) of the subclass is S, then the Richter substitution principle requires s to be less than or equal to T. 3. Dependency inversion principle (DIP): The high-level module should not rely on the bottom low-layer module, both should rely on its abstraction; Abstraction should not depend on details; Detail should be dependent on abstraction. The dependency of a PS object is passed in three waysOne, the construct

The so-called No recruit wins a recruit, practice a kung fu divides into internal strength and drilling. Drilling is like the moves, is the so-called 23 kinds of design patterns. But the internal strength, is the heart, that is the 6 kinds of laws. The light will drilling that is the huaquanxiutui, the internal strength is the realm. So many design