etl design patterns

Reprint: http://blog.csdn.net/u013142781/article/details/50825301 There are 23 kinds of Java Classic design patterns, which are divided into three categories: the creation mode (5 kinds), the structure pattern (7 kinds) and the behavior pattern (11 kinds). Behavioral patterns are subdivided into 11 types: Policy mode, template method pattern, observer mode, ite

Today in Terrylee Cnblog (http://terrylee.cnblogs.com) saw the design patterns related to the whole set of articles, beginners design patterns after reading each article to do some notes and excerpts. What is design mode and what is architecture?

To correctly use state and policy patterns in Java applications, developers need to be aware of the differences between the two patterns. Although the structure of the state and policy patterns is very similar, they also follow the open and closed principle, representing the solid design principles of the ' O ', but th

Five common PHP design patterns-the factory model. Five common design patterns in PHP-the factory model has always had a sense of reverence for the design patterns. every time you want to see the

This article continues to introduce23 Design Mode SeriesThe Observer pattern. definitionIn the process of software building, the internal structure of collection objects often varies, but for these collection objects, we want to allow external client code to transparently access the elements contained therein while not exposing its internal structure, and this "transparent traversal" also provides the possibility for the same algorithm to operate on a

;}} 2 , client-side code static void Main (string[] args){Singleton Singleton2 = Singleton.getinstance ();Singleton Singleton3 = Singleton.getinstance ();if (Singleton2 ==singleton3){Console.WriteLine ("Instance Singleton2 is the same as instance Singleton3! ");}Console.readkey ();} The singleton pattern can also be used without shackles, such as using the three-layer technology call class in a class:#region get its own singleton mode: UserInfo

implementation is just a common Java class, as long as the basic needs of the singleton, you can do in the arbitrary implementation of some other functions, but static class does not. From the above summary, the basic can see the difference between the two, but, on the other hand, we finally realized that the singleton pattern, the interior is a static class to achieve, so, the two have a great correlation, but we consider the level of the problem is different. The combination of two ideas to c

I. Description of the pattern There are a series of objects in my program, like we're going to have a bowl of rice, a cup of coffee (Coffee) ..., to take advantage of them, we have to generate them in the program according to the user's requirements, and then call the new operator one at a, This way the client will know the corresponding class information, the generated code is obviously not flexible. So we can not use the specific classes in the code, but just to show what we need, and then we

What is a pattern Before preparing for the final exam, the trouble and the pernicious, really idle to update the article, today and you talk about the design patterns in JavaScript. First, what we need to know is that the pattern is a reusable solution, and the reverse pattern is a bad solution for a problem. JS Anti-pattern Common examples 1. Passing strings to settimeout and setinterval, rather than f

):def __init__(self): Self.name='Processserver'self.state=state.newdefboot (self):Print('booting the {}'. Format ( self) self.state=state.runningdefKill (Self, restart=True):Print('killing {}'. Format ( self) self.state= Stae.restartifRestartElseState.zobmiedefcreate_process (self, user, name):Print("trying to create process ' {} ' for user ' {} '". Format (name, user)classWindowsServer:PassclassNetworkserver:PassclassOperatingSystem:def __init__(self): Self.fs=fileserver () self.ps=Processserve

(String Person: This. Getfriends ()) {List.add (person); } //frend.setfriends (list); returnfrend; } Catch(clonenotsupportedexception e) {e.printstacktrace (); return NULL; } }} PackageChenyang;Importjava.util.ArrayList;Importjava.util.List;/*** Text of the test class * *@author65245 **/ Public classText { Public Static voidMain (string[] args) {//1. Create a direct assignment to the collectionPerson person =NewPerson (); ListNewArraylist(); List.add ("Hello"); List.add

The factory class pattern provides the pattern of creating a single class, while the builder pattern is to centralize the various products to manage, to create composite objects, so-called composite objects that refer to a class that has different properties, in fact the builder pattern is the combination of the previous abstract factory pattern and the last Test. Let's look at the code:As before, a sender interface, two implementation classes MailSender and Smssender. Finally, the Builder class

This article and the author of the original text has a certain deviation, which added a part of the personal view, please check the author's original text. *** Original Connection Http://www.dofactory.com/Patterns/PatternCommand.aspx Command mode intent: GOF in the Book of Design Patterns: "Encapsulate a request as an object so that you can parameterize the cl

Design patterns are divided into three main types: creation, structure and behavior. This article describes the observer patterns, template method patterns, command patterns, state patterns, and responsibility chain

program does not need to know (or care) that it obtains the specific types of objects from these internal factory methods because the client program uses only the generic interfaces of those objects. Abstract Factory mode separates the implementation details of a set of objects from their general usage. A "factory" is where a product (object) is created to separate the creation of the product from the use of the product. The purpose of abstract Factory mode is to separate the interface of seve

Context.getsystemservice to obtain a system service management object, it first obtains the corresponding Servicefetcher object from the Map collection based on the service name , and then calls The GetService function of the Servicefetcher object obtains the service management object created by the Servicefetcher object. In the getservice function of the Servicefetcher object, first from the list of cache arrays maintained by the context, find if the index of the Servicefetcher object already

Introduction to Template Method Patterns Template method, as the name implies, is the general process of doing some tasks. If there are many self-introduction templates on the Web, the recommendation template, that is, the beginning and end of the content may be similar, and in the middle of the need for customers to modify the use. Design patterns originate from

I. BACKGROUNDWhen it comes to producer-consumer models, it is necessary to mention multithreading, multithreaded development is commonly used in development, multi-thread programming is more stable than single-threaded,A thread that hangs does not affect the normal operation of the entire program. However, dirty reads occur when multiple threads are manipulating a data source at the same time.Ii. introduction of producer consumer ModelsThe producer-consumer model solves the problem of strong cou

Java design patterns cainiao series (I) Modeling and implementation of policy patterns Reprinted please indicate the source: http://blog.csdn.net/lhy_ycu/article/details/39721563 Let's start to talk about Java design patterns today. Here we will explain it with uml graphics

design patterns are divided into three main types: creation, structure and behavior. This article describes the structural pattern.The structure mode includes adapter mode, bridge mode, combination mode, decoration mode, appearance mode, enjoy meta-mode and proxy mode.Adapter Mode: transforms the interface of a class into another interface that the customer wants. The adapter mode makes it possible for thos