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2: Common Architectures and Protocols
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Given an Architecture Described in Terms of Network Layout, List Benefits and Potential Weaknesses Associated with It
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3 4. B, C, and D are correct. The system you have suggested they migrate to is a three-tier system. The characteristics of a three-tier system are thin clients, good separation of business logic, and good scalability. This is due to the fact that each tier is separate from the other (for example, it would be possible to change the data store without affecting the business logic). A, E, F, and G are incorrect. Choice A is incorrect; the suggested system has thin clients, the business logic residing on the application server, in the middle tier. Because there is a good separation of business logic, choices E and G are incorrect. Choice F is incorrect, as the threetier nature of the system makes it very scalable.
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Object-Oriented Analysis and Design
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3.01 3.02 3.03 Draw UML Diagrams Interpret UML Diagrams State the Effect of Encapsulation, Inheritance, and use of Interfaces on Architectural Characteristics
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3: Object-Oriented Analysis and Design
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ne of the fundamental challenges facing software architects is change. The need to develop maintainable software systems has driven interest in approaches to software development and design. Object-oriented technology has proved over time to be one of the most mature paradigms for design and implementation of large-scale systems. Software architects are expected to be able to understand and communicate high-level design concepts to programmers under their direction and also to higher-ups who must approve their designs. Thus, the SCEA certification puts a great deal of emphasis upon object-oriented design concepts and less on concrete APIs. In particular, the design abstraction known as the Unified Modeling Language (UML) receives strong emphasis. The SCEA Part 2 is the literal and figurative center of the exam. Here, candidates must submit a JEE-based project solution for a given business scenario. The scenarios may contain both B2C (business-to-consumer) and B2B (business-to-business) aspects. The preparation for this part of the exam obviously requires a thorough knowledge of JEE and whatever is current in terms of assembled components. But your preparation for this exam part revolves around the UML. Your project will be evaluated on a number of objective criteria that fall into three categories: 1. Class Diagram This category covers how well your class diagram(s) address the object model needed to satisfy the requirements. 2. Component Diagram This category covers how well your component diagram(s) convey the structure of the architecture in satisfying the requirements. 3. Sequence/Collaboration Diagrams This category covers how well your sequence or collaboration diagrams satisfy the requirements of the assignment. Additionally, the project is evaluated based upon UML compliance. The maximum number of possible points is 100. The minimum passing grade is 70. The maximum points per category are 1. Class Diagram(s): 44 2. Component Diagram(s): 44 3. Sequence/Collaboration Diagrams: 12 With that said, UML is a system for drawing diagrams of object-oriented designs and using these diagrams throughout the design process. UML evolved out of a synthesis of several design methodologies to become an industry standard overseen by the Object Management Group (OMG, see www.omg.org/uml). This chapter will cover UML with a view toward providing what you need to deliver a project for Part 2 of the exam. Also see the 11 Case Study, which provides a UML-based project solution for a B2C and B2B securities trading system.
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Analysis and Design of Object-Oriented Architecture
Analysis and Design of Object-Oriented Architecture
Modeling is a visual process used for creating in a preserved form the design and structure of an application. Before, during, and after development, it is typical and prudent to outline an application, depicting dependencies and relationships among the components and subsystems. Like any good development tool, today s modeling tools facilitate this process by tracking changes made in the model to reflect the cascading effects of changes. Use of modeling tools gives developers a high-level and accurate view of the system. Modeling can be used at any point in a project. Most modeling tools can reengineer and use code as input to create a visual model. The standard for modeling tools is the Unified Modeling Language (UML). This standard unifies the many proprietary and incompatible modeling languages to create one modeling specification. Use of modeling tools for development projects is increasing. With the increasing complexity of enterprise Java applications and components, modeling is a virtual necessity. It can reduce development time while ensuring that code is well formed. Modeling is useful whether the objective is to understand and modify an existing computer-based business system or to create an entirely new one. An obstacle to engineering successfully is the inability to analyze and communicate the numerous interactive activities that make up a business process. Conversational languages, such as English, are ambiguous and therefore ineffective for communicating such objectives and activities. Formal languages are unintelligible to most functional (business) experts. What is needed instead is a technique that structures conversational language to eliminate ambiguity, facilitating effective communication and understanding. In a process model, extraneous detail is eliminated, thus reducing the apparent complexity of the system under study. The remaining detail is structured to eliminate any ambiguity, while highlighting important information. Graphics (pictures, lines, arrows, and other graphic standards) are used to provide much of the structure; so most people consider process models to be pictorial representations. However, wellwritten definitions of the objects, as well as supporting text, are also critical to a successful model. In engineering disciplines, the model is typically constructed before an actual working system is built. In most cases, modeling the target business process is a necessary first step in developing an application. The model becomes the road map
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