Software Framework introduces a "semi-finished" software that is americly "semi-finished" software facing a field (including business areas, such as ERP, and calculation, such as GUI), which implements common part of this area and provides a range of definitions. Good variable points to ensure flexibility and scalability. It can be said that the software framework is a software system for analysis results, and is a template for the final application in the field. With the expansion of software scale, the application's extensive and software multiplexing technologies, there are many deficiencies in software multiplexing in subprogram or class (class): (1) The subroutine is getting increasingly huge, it is difficult to use Master, (2) Most types of particle size is small, and it is often unable to complete useful functions. This problem is forcing people to consider a set of classes (or modules) and their interaction as a whole in multiplexing, thereby appearing software framework. The software frame includes at least the following components: (1) a series of completed computing modules, referred to herein as a component. (2) The relationship between the components and the interactive mechanism. (3) A series of variable points (also known as hotspots, hot-spots, or adjustment points). (4) behavioral adjustment mechanism of variable point. The developer is bound to the variable point of the software module unique to the software frame through the software framework of the software framework to obtain the final application, which is called the instantiation of the software framework. . Through the use of software framework, developers can focus on the development of modules unique to the application, which greatly improves software productivity and quality. The behavioral adjustment mechanism of the software framework refers to how to adjust the variable portion of the framework for specific applications, how to add the methods and rules used in variable points to join a specific application module. The behavioral adjustment mechanism can be divided into four types: (1) template parameterization. Software Framework provides code automatic generation tool that automatically generates the required code according to the parameters set by the user. (2) Inherit and polymorphism. Adding new functions or changes the behavior of the parent class by adding subclass in the object orientation. (3) Dynamic binding. Dynamic binding the required object service during runtime, can be implemented by software mode technology. (4) Replacement of components. By replacing the pluggable components inserted in the frame to join business-specific functions, it is different from a general reusable software product, a significant feature of the software framework is reverse control (Inversion of Control), during the multiplexing process, the former needs to be Explicit calls, control is in the application specific module, the software framework is not, the application developer will automatically call the module according to its own interactive mechanism as long as the application developer is bound to the framework, and the framework automatically calls the module according to its interactive mechanism. There are many software frames. According to its application, it can be divided into: (1) System infrastructure framework. Used to simplify system level software, such as operating systems, user interfaces, language processing, etc., typical examples are Macapp, Microsoft's MFC, etc. (2) The middleware integrated framework. Used to assemble distributed applications and components, typical examples are Microsoft's DCOM, JavaSoft's RMI, OMG's CORBA, etc. (3) Enterprise Application Framework. Used in various applications, such as telecommunications, manufacturing, finance, etc. According to its performance, it can be divided into: (1) white box frame. Support white box multiplexing, large class libraries or subroutines typically provide a white box framework to assist multiplexing.
(2) Black box frame. Support for black boxes. The middleware integrated framework is generally a black box frame. The architecture and architecture are usually the Software Architecture. Architecture typically includes three parts: components for description; connector, connectors for describing components; configuration, connectors and connectors It makes up an organic whole. The definition of the system structure is more seriously recognized, see "Introduction to Software Engineering Technology" (Science Press). The difference between the architecture and the framework is as follows: 1. Explanation form is different. The exhibit form of the architecture is a design specification, while the framework is the program code. 2. The purpose is different. Most of the primary purposes of the architecture are to guide a software system implementation and development; and the primary purpose of the framework is to be multiplexed. Therefore, a frame can have its architecture for guiding the development of the framework, and it is otherwise. 3. There is a special architecture, and the primary purpose of DSSA (domain specific architecture) is also for multiplexing. 4. There is something called the architecture style. After implementing it with the program code, it has become a Corba, COM, and they call the architecture framework, also called the middleware integrated framework, and some people want to call it in the middle of the object. Piece
What is the pattern? What is a framework? (Briefly) --UB (ub5023@msn.com) 2003-6-6 Now the software design is a model, a framework. Some friends ask what is model? I am also in learning, I will give the following summary on my learning experience. (Note: Personal views, for reference only, welcome to correct.)
1. What is the pattern? Mode, ie pattern. In fact, it is a methodology that solves a certain type of problem. You summarize the method of solving a type of problem to the theoretical height, that is, mode. The classic definition given by Alexander is that each mode describes a problem that has emerged in our environment and then describes the core of the solution. In this way, you can use the existing solutions countlessly without counting the same job. There are different fields in the model, and there are architectural models in the building, and there are also design patterns in the software design. When a field is gradually mature, there will be many modes.
What is a framework? Frame, is Framework. In fact, it is a semi-finished product of some application, is a set of components for you to complete your own system. Simply put to use the stage of others, you will do performance. Moreover, the framework is generally mature, continuously upgraded software.
2. Why use mode? Because the mode is a guide, under a good guide, it helps you complete the task, help you make a good designer, reaching the effect of half the effort. And you will get the best way to solve the problem.
Why use the framework? Because the development of software systems is already complicated today, especially server-side software, design to knowledge, content, and there are too many problems. In some ways, the use of some people's mature framework is equivalent to letting others help you complete some basic work, you only need to concentrate on complete the system's business logic design. And the framework is generally mature, robust, and he can handle a lot of details, such as things such as things, security, data stream control. There is also a framework usually used by many people, so the structure is very good, so the scalability is also very good, and it is constantly upgrading, you can directly enjoy the benefits of the upgrade code. The framework is generally in the middle layer between the low-level application platform (such as J2EE) and high-level business logic. Why is the software hierarchical? In order to achieve "high polymerization, low coupling". Cut the problem to all solve, easy to control, easy to extend, easy to allocate resources ... there are a lot of benefits :).
3. The following is mainly in Java, J2EE mode and framework: What is the common design pattern? First of all, you have to understand the "design pattern - the foundation of the object-oriented software" book (this can be said to be the programmer must have, pay attention: GOF is not alone, but refers to four people . Its intent is to Gangs Of Four, is the "gang of four", meaning four of the book: Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides. This book tells 23 main modes, including: abstract factories, adapters, appearance mode, etc. There are still many modes, which are estimated to have more than 100 kinds. There are too many software design patterns, just simply talk about the most common MVC mode. The MVC mode is proposed by Buschmann in 1996: Model: The package data and all operations based on these data. View (view): The package is packaged, that is, the user interface. Control: It is the operation of the package to the model and control of the data flow direction.
In addition: RUP (Rational Unified Process) software unified procedure, XP (EXTreme Programming) extreme programming, which is often called "process method", is a methodology of a software project implementation process, which is proposed for the implementation of software projects. Strategy. It is also another angle mode.
4. What is the common Java framework? WAF: Web: Web Application Framework main application: EJB layer, (Web layer is also, but weaker). Main application technology: EJB and other sources: http://java.sun.com/blueprints/code/index.html Brief: This is the framework inside the example PetStore (Pet Store System) used in the J2EE platform. It is the application framework proposed in the Sun Blue Book Example. It implements MVC and other good design patterns. SUN's website has technical information, it is best to download the PetStore to study, WebLogic comes with this system, source code in the BEA / WebLogic700 / Samples / Server / Src / PetStore. This is the preferred framework for learning J2EE. free.
Struts: Main application: web layer. Main application technologies: JSP, Taglib, JavaBean, XML, etc. Source: http://jakarta.apache.org/struts/index.html Brief: This is an open source project of Apache, currently widely used. Based on the MVC mode, the structure is very good, based on JSP. The production of Struts 1.02 has been integrated in JBuilder8. free. Example of WAF Struts combined with: Web layer Struts, EJB layer WAF: JSP (Taglib) -> Actionform -> Action -> Event -> EJBAction -> EJB -> DAO -> Database JSP (Taglib) (Forward) <- Action <- EventResponse <-
Turbine: Main application: Web layer. Main application technology: servlet and other sources: http://jakarta.apache.org/turbine/index.html: This is an open source project of Apache. SERVLET. It is said that the speed is relatively fast, and various services are available in the way in Service (Pluggable Implementation Pluggable Components). free.
COCOON: Main application: web layer. Main application technology: XML, XSP, servlet, etc. Source: http://cocoon.apache.org/2.0/ Brief description: This is an open source project of Apache. Based on XML, based on XSP (popular, XSP is a dynamic XML document formed after joining the Java program in XML static documentation.). Features is to interact with a variety of data sources, including file systems, databases, LDAP, XML repository, network data sources, and the like. free.
Echo: Main application: web layer. Main application technology: servlet and other sources: http://www.nextapp.com/products/echo/ Brief description: An open source project for nextApp. SERVLET. The page can be made very beautiful, combined with ECHOPOINT, you can make a lot of graphics effects (with a JFreeChart package inside). Use Swing ideas to make a web page, do HTML as a class of Java. But a lot of use of session, a lot of Frame, and the system resource consumption is very large. free.
JATO: full name: Sun One Application Framework Main application: web layer. Main application technologies: JSP, Taglib, JavaBean, etc. Source: http://www.sun.com Brief: This is a commercial framework launched by Sun. When you look at the name, you will know that it is launched in conjunction with Sun One. I downloaded Jato2.0 and I feel simple, using JSP Taglib Javabean. As his DOC said Jato is suitable for use in a small web application. free.
TCF: full name: Thin-Client Framework main application: Java GUI. Main application technology: Java Application et al .: http://www.alphaworks.ibm.com/tech/tcf brief description: This is a framework out of IBM. Based on the MVC mode based on Java Application. Recommend a introduction article: http://www-900.ibm.com/developerWorks/cn/java/j-tcf1/index.shtml Charge: Each business object license: $ 2,000. 5. In fact, this paper is "Throwing Tour Yu", I hope that all the experts will ask you to listen to the characteristics of various frameworks, for your reference, choose.
