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 Figure 2 Web Application Model Figure 1 Software Application Model [3] 1.2.3 Phases - Development Cycle • Analysis • Design • Implementation The sequence of steps to model the levels should be decided by the modeler. Depending on the type of Web application, it should be possible to pursue an informationdriven approach, i.e., starting with content modeling, or a presentation-driven approach, i.e., starting with modeling of the application’s presentation aspects. Model-based development in Web engineering contradicts somewhat the often found practices in Web projects comprising, e.g., short-lived development cycles and the desire for “agile methods”. A model-based approach counters this situation with a comprehensive specification of a solution model and, if appropriate case tool support is available, the possibility to automatically generate the (prototypical) Web application. Models also ensure the sustainability of solution ideas, in contrast to shorter-lived software solutions. In addition, the communication amongst the developers of a team as well as between customers and developers is improved. 1.3.2 Phases Approach depends upon type of application • Information based: Document-centric Web sites, which are hierarchical collections of static HTML documents (basically, plain text and images) that offer read-only information based on a set of structured content, navigation patterns, and presentation characteristics designed and stored a priori. • Presentation based: Presentation based that refers to the visual elements that comprise the Web pages. • Logic based o Business Logic: Means changes in the underlying platform do not affect existing applications. o Application Logic: Means business logic can evolve independently from the underlying technology. Analysis and Design of Web Applications [4] 1.3 Web Application Modeling [3] 1.3.1 Levels –It contains Information, Node/link structure, UI and page layout separate. • Presentation • Structure : user interface elements and their composition • Behavior : reactions to input events, interaction and synchronization between user interface elements • Hypertext • Structure: page compositions and navigational relationships • Behavior: run-time behavior of hypertext • Content • Structure: domain-dependent data • Behavior: domain-dependent application logic Figure 3 Analysis and Design of Web Application Model • Analysis Phase : Requirement Specification of Web Application • Design Phase: It contains Representation of the software to be built which is either Technology dependent or Technology independent. • Implementation Phase: It consist of Executable models and Executable codes are buit up here. 1.3.3 Aspects Same as above Software Applications. 1.3.4 Customization Context information Methods adopted or the webs are not new. They are derived from traditional SW. But Question is that Why hyperlinks? Why adding a new layer? So, we can say Corresponds to the status of web IJCTA | May-June 2013 Available online@www.ijcta.com 515
Anup Hande et al , Int.J.Computer Technology & Applications,Vol 4 (3),514-521 ISSN:2229-6093 applications and Improve reuse Content, is the content as displayed in the web application equivalent to information structure. In web application several pages access the same content. If you model it you can reuse it. In short modeling is a technique used in analysis and design. It uses notation (syntax) (graphical representation and language), process for building models (rules and guidelines) and Graphical editors. Which have Object- Oriented Analysis & Design. • Analysis: Finding & discovering classes of objects/ concepts in a domain • Design: Defining software objects & how they interact to fulfill requirements. 3 MODEL DRIVEN DEVELOPMENT 3.2 Introduction When it comes down to it, the real point of software development is cutting code. Diagrams are, after all, just pretty pictures. No user is going to thank you for pretty pictures. 3.3 Unified Modelling Language (UML)[8] “The Unified Modeling Language is a visual language for specifying and documenting the artifacts of systems.” It is Language of choice (and ISO standard) for diagramming notation in OO development. • Structural – Class diagrams (domain models) [4] • Behavioral – Use Cases [7], Sequence diagrams [7] Currently at version 2.0, although many analysts and designers still use 1.0 3.4 The Role of Model in the Development 1) Models as sketch : It has been developed to For communicating ideas and alternatives. It’s essence is selectivity although “sketchers” don’t’ have to care much about it. 2) Models as blueprint : All design decisions (maybe of a particular area) are laid out. It’s essence is Completeness – programming should be pretty straightforward. But some time there is a Issue of reverse engineering. 3) Models as program: we can generate application automatically. In MDA separation of Platform Independent Model (PIM) and Platform Specific Model (PSM) [4].ideally the transformation is "parameterized" by a Platform Description Model (PDM) it’s essence is models become the source code. 3.5 Model - Code Interplay Error! Reference source not found. Figure 4 Model – Code Interplay Systematic development on basis of models and now a days Models become the first hand artifacts in the software or web development cycle. Key concepts are abstraction from implementation detail and systematic transformations. Related Terminology are as below: • Model Driven [Software] Engineering (MDE), • Model Driven [Software] Development (MDD/MDSD), • Model Driven Architecture (MDA) • Model Driven Web Engineering (MDWE) 4 DEVELOPMENT IN THE MDA 4.2 PIM : Platform Independent Model(PIM) represents business functionality and behavior without technology details 4.3 PSM Applies a standard mapping to create or generate a Platform Specific Model (PSM) from the PIM 4.4 Code Model Create or generate the code for PSM Figure 5 Development Model in MDA[4] Due to short development cycles and the complexity of Web applications, it is recommended to use tools that support not only the modeling itself, but also and particula–rly automatic code generation and model consistency check. The following subsections describe WebRatio Site Development Studio, VisualWADE, and IJCTA | May-June 2013 Available online@www.ijcta.com 516
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