etl design patterns

Today, software development has changed dramatically. A major change is the introduction of structured programming. Structured Programming divides applications into many functions,Each function executes a specific task, and each function is named for what it will execute, followed by object-oriented programming. Make C ++ and smalltalkNowadays, developers rely on classes to write their code and use these classes modeled in reality for programming. The main objective of these methods is to help c

Design patterns are divided into three types: created, structured, and behavioral. Among them are: First, Singleton, Singleton mode: Ensure that a class has only one instance, and provide a global access point to access it. Abstract Factory, Abstraction Factory: Provides an interface to create a series of related or interdependent objects without specifying their specific classes. Factory method, Fa

Java Singleton design pattern, there are many ways to implement, the following describes some of the more famous implementation methods A Hungry man typeThis design pattern is simple, and there is no multi-threading security problem, which is generally used in practical development. Class Hungerydemo{private Hungerydemo () {}private static final Hungerydemo instance = new Hungerydemo ();p ubli

: Interface high cohesion is internally highly dependent and isolated as much as possible. That is, the method of internal declaration of an interface is related to a sub-module, and is required by this submodule. Interface design is limited: If you fully follow the principle of interface separation, there will be a problem, that is, the design of the interface will be less and less, so that the number

}Singletonlazy The object is not created immediately after it is loaded into the method area, it is not created until the GetInstance method is called. This way can save memory space, but there is also a thread security problem, when thread a execution to the judgment object is null, when thread B gets execution, thread B determines that the object is null, then thread a regain execution, create the object, thread B resumes, continue to create the object. Modify the code as follows, using a sync

What is the design pattern? In the process of Learning Object-oriented, we will always come into contact with the pattern from time to time! As our predecessors have mentioned, the design model is a summary of people's experience! In software development, we always encounter some reusable components,CodeSo that we can focus on Object-Oriented Reusable Technology. With the development of Reusable Technology,

design mode source code downloadDesign mode source code download1 Template Method modeThe Template method pattern defines the steps of an algorithm and allows a subcategory to provide its practice in one or more steps. Let the subcategory redefine some of the steps in the algorithm without changing the algorithm schema. ----WIKIPEDIAPersonal understandingTemplate method mode is relatively simple, generally is defined by the abstract class template me

Design mode one to 20 is Gof "design mode" content summary, and use PHP instructions to implement, Gof "design mode" refers to the code is C + +. Examples are not particularly typical.At present, I am in the framework of the development project, the use of the pattern has to the appearance mode, proxy mode, adapter and other modes, these are not for the pattern,

The original address, will continue to update the Http://it.zuocheng.net/mvc-design-pattern-design-principle-summary process technology BlogThis article takes the mainstream MVC framework as an example, such as Java ssh, PHP symfony and Zend Framework, after simply analyzing their design principles, find the design

mode to expand the function, so I think of the aspect-oriented programming, because I remember that AOP in the implementation of the time, is to enhance the function of the class, can be executed before the method call, after the call, the exception when the occurrence of the time to do the corresponding processing, I would like to be implemented when the pattern is the decoration mode? Here I first keep this question later have time to see the source of the words and then to explore whether th

High-quality code design patterns for large. NET ERP Systems1 Cached cacheIn the system, a large number of cache design patterns are used to cache the data unchanged after the system is logged in, and not read directly from the database. Consuming some memory is much more cost-effective than reading data again from SQL

One of the most important aspects of writing easy-to-maintain code is the ability to find and optimize the body of code that recurs. This is also a valuable part of the design pattern.Design Pattern Categories:First, the creation of design patternsCreation design pattern partitioning focuses on working with object creation mechanisms to create objects in a way th

For Java programmers, mastering object-oriented design theory and some design patterns is an essential skill. To start programming without learning a theory is similar to learning a language without studying the alphabet. There's a lot of object-oriented theory, design patterns