Survey of Existing Web Models Techniques to Design Web Application

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Anup Hande et al , Int.J.Computer Technology & Applications,Vol 4 (3),514-521 ISSN:2229-6093 the OpenUWE Suite as examples for this type of tools. 5 STEPS FOR DEVELOPMENT 4.1 Step-1 • All MDA development projects start with the creation of a Platform Independent Model (PIM), which is expressed in UML. The PIM expresses only business functionality and behavior. Built by business and modeling experts working together, this model expresses business rules and functionality undistorted, as much as possible, by technology. • The clarity of this modeling environment allows business experts to ascertain, much better than they could if working with a technological model or application that the business functionality embodied in the PIM is complete and correct. • Another benefit: Because of its technological independence, the PIM retains its full value over the years, requiring change only when business conditions mandate. • Transition: MDA tool applies a standard mapping to generate Platform-Specific Model (PSM) from the PIM. Code is partially automatic & partially handwritten. 4.2 Step-2 • Once the first iteration of the PIM is complete, it is stored in a MOF based Repository and input to the mapping step which will produce a Platform-Specific Model (PSM). To produce your PSM, you will have to select a target platform or platforms for the modules of your application. Such as J2EE, .NET etc. • Transition: MDA Tool generates all or most of the implementation code for deployment technology selected by the developer. 4.3 Step-3 • Once the PSM has been created/generated, the 3rd and final step is to generate the code/implementation model. This will create/generate all of the files the platform requires. • When I talk about platforms, I’m referring to the application server(s) your application will run on and programming languages, such as Java, C++ or C# your application will be generated into. • This will result in a first cut working application, which can be further enhanced through the MDA process or by hand-coding 4.4 Step-4 • Take note that the mapping standard between PIM, PSM and the Code Model has been defined by OMG but the implementation not. • MDA compliant tool vendors have implemented portions of the MDA, but Optimal is one of the few tools that has implemented the MDA completely to automatically generate a complete application from a PIM to PSM and finally to the Code Model. IJCTA | May-June 2013 Available online@www.ijcta.com 6 MODELLING METHOD HISTORY ERROR! REFERENCE SOURCE NOT FOUND. Figure 6 Modelling method History Diagram Modeling methods have different paradigms, depending on their origin & focus: Data-oriented methods originate from the field of database systems; they are mainly based on the ER model enhanced by specific concepts for modeling on the hypertext level. The primary focus of these methods is the modeling of database-driven Web applications. Examples of data-oriented methods include the Relationship Management Methodology(RMM),Hera and the Web Modeling Language. • Hypertext-oriented methods center on the hypertext character of Web applications; they emerged mainly from the field of hypertext systems. Representatives of this group are the Hypertext Design Model (HDM), which has been extended intoW2000, and HDM-lite, or the Web Site Design Method (WSDM). • Object-oriented methods are based on either OMT (for the very early methods) or UML. UML is the preferred notation when a standard language for modeling is selected. This category includes the Object-Oriented Hypermedia Design Method (OOHDM) (Schwabe and Rossi 1998), UML-based Web Engineering (UWE) Object-Oriented Web Solutions (OOWS) and the Object-Oriented Hypermedia (OO-H) method. • Software-oriented methods look at Web applications mainly from the perspective of traditional software development, using techniques that strongly follow classical Software Engineering. 7 WEBML (WEB MODELLING LANGUAGE) 7.2 Introduction WebML enables designers to express the core features of a site at a high level, without committing to detailed architectural details. WebML concepts are associated with an intuitive graphic representation, which can be easily supported by CASE tools and effectively communicated to the non-technical members of the site development team. 7.3 Architecture of WebMLError! Reference source not found. WebML is a third-generation Web design methodology base on MDA. It is a conceptual language aimed at 517
Anup Hande et al , Int.J.Computer Technology & Applications,Vol 4 (3),514-521 ISSN:2229-6093 supporting all the activities and perspectives of Web applications design, especially data-intensive and processcentric web application. According to the MVC framework, WebML model is divided into Data Model, Hypertext Model and Presentation Model. Figure 1 shows the architecture of the WebML. • The Data Model describes the conceptual data organization according to the Entity-Relationship Model. • The Hypertext Model enables the specification of the front-end of web applications. The Presentation Model extends the hypertext model with simple constructs such as operations and transactions, enabling the invocation of predefined operations. 8.3 UML Class Diagram UML class diagrams used at analysis-level and designlevel in which elements to be modeled represented by classes Units of information, users of the system (user model), associations represent relationships between classes, aggregation used to show an whole/part relationship, Composition is a strong form of aggregation that requires a part instance be included in at most one composite at a time. If a composite is deleted, all of its parts are normally deleted with it. And inheritance used to show hierarchies between classes. In addition to the class diagram, Figure 4-1 shows a state machine diagram used to model the various states of a paper in the reviewing system. It shows that a submitted paper will be assigned to three reviewers for review after the submission deadline has expired. If a pre-set threshold value is reached, the paper is accepted; otherwise, it is rejected. In both cases the authors are noticed via e-mail about the outcome of the review. Finally, an accepted paper will be printed once final version has been submitted. 8.4 Content Behaviour Model [4] Figure 7 WebML Architecture Diagram 8 CONTENT MODELLING 8.2 Introduction To model the information requirements of a Web application Diagramming the structural (i.e., information objects) and Behavioral aspects of the information. It expresses the data content of the site, in terms of the relevant Entities and relationships. It doesn’t concerned with navigation. And Primary Models are Class diagrams (enough for static applications), State machine diagrams (captures dynamic aspects) and ER- diagrams. Although Representation with “pure” UML is sufficient stereotypes are not needed. The information provided by a Web application is one of the most important factors for the success of that application, not least due to the origins of the Web as an information medium. Modeling the content in the sense of pure data modeling is normally sufficient for static Web applications. Complex Web applications additionally require the modeling of behavioral aspects. This means that content modeling includes the creation of the problem domain model, consisting of static and dynamic aspects, as known from traditional Software Engineering. Figure 8 Content Behavior Model Activity Diagram 8.5 Comparison of Object Operations between WebML and OO-H[1]. Figure 9 Comparison of WebML & OO-H Figure (a) shows an excerpt of the content model of the album store example. In Figure (b) we depict the corresponding OO-H content model that needs to be generated by the transformation rules. For each Entity in the content model of WebML an OO-H Class is generated. IJCTA | May-June 2013 Available online@www.ijcta.com 518
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Survey of Existing Web Models Techniques to Design Web Application

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