q Reliability in Java

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q Reliability
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2: Common Architectures and Protocols
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q Manageability
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The ability to administer and thereby manage the system resources to ensure the availability and performance of a system with respect to the other capabilities. The ability to address architectural and hardware configuration changes without a great deal of impact to the underlying system. The ability to carry out functionality in a time frame that meets specified goals. The ability of a system to run multiple tasks per unit of time. The ability to support the required availability and performance as transactional load increases. The ability to extend functionality. The ability to predict and confirm results based on a specified input or user gesture. The ability to use a component in more than one context without changing its internals.
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q Flexibility
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q Performance q Capacity q Scalability
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q Extensibility q Validity
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q Reusability q Security
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The ability to ensure that information is not accessed and modified unless done so in accordance with the enterprise policy.
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Self Test
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SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. Read all the choices carefully because there might be more than one correct answer. Choose all correct answers for each question.
Recognize the Effect on Each of the Following Characteristics of Two-tier, Three-tier and Multi-tier Architectures: Scalability Maintainability, Reliability, Availability, Extensibility, Performance, Manageability, and Security.
1. Which of the following is true about the requirements of a banking system A. The need for security is a classic example of a functional service level requirement, and a checking account rule is an example of a nonfunctional requirement. B. Security and the mandatory checking account both illustrate functional service level requirements. C. Neither security nor the mandatory checking account is an example of any kind of requirement, theoretically speaking. D. Security is an architectural nonfunctional requirement and the mandatory checking accounts a functional design requirement. E. They are both examples of business use cases. 2. Which of the following are nonfunctional requirements A. Scalability, availability, extensibility, manageability, and security B. Performance, reliability, elaboration, transition, documentation, and security C. Specification, elaboration, construction, transition, use cases, and security D. Performance, availability, scalability, and security E. Reliability, availability, scalability, manageability, and security 3. Which of the following is the most important item that should be considered when designing an application A. Scalability B. Maintainability C. Reliability D. Meeting the needs of the customer E. Performance F. Ensuring the application is produced on time and within budget
2: Common Architectures and Protocols
Given an Architecture Described in Terms of Network Layout, List Benefits and Potential Weaknesses Associated with It
4. Your have been contacted by a company to help them improve the performance of their e-commerce application. You have suggested that the hardware on which the application is currently deployed (two web servers and a database server) be migrated to three web servers, an application server, and a database server (all on different machines). You assure them that all the required software rewrites will be worth it in the long run. What are the characteristics of your suggested architecture A. Fat clients B. Thin clients C. Good separation of business logic D. Good scalability E. Poor separation of business logic F. Poor scalability G. There is no difference in the separation of business logic
Self Test Answers
SELF TEST ANSWERS
Recognize the Effect on Each of the Following Characteristics of Two-tier, Three-tier and Multi-tier Architectures: Scalability Maintainability, Reliability, Availability, Extensibility, Performance, Manageability, and Security.
3 1. D is correct. Successful software architecture deals with addressing the nonfunctional service level requirements of a system. The design process takes all functional business requirements into account. Security is considered a nonfunctional requirement and specific business rules, such as the one described for the checking account, are considered functional requirements. Choice D is the only choice that accurately describes this. A, B, C, and E are not true. Choice A is incorrect because the functional and nonfunctional requirements are switched. Choice B is incorrect because only one of them is a functional requirement. Choice C is incorrect because, as just described , one of them is a functional requirement and the other, a nonfunctional requirement. Finally, Choice E is incorrect because business analysis may start with use cases. 3 2. D is correct. The nonfunctional service level requirements discussed are performance (I: The system needs to respond within 5 seconds); availability (II: The system needs to have a 99.9 percent uptime); scalability (III: An additional 200,000 subscribers will be added); and security (IV: HTTPS is to be used). Hence, choice D is correct. A, B, C, and E are incorrect. There is no mention of extensibility (ability to easily add or extend functionality) and manageability (ability to monitor the health of the system). Hence, choice A is incorrect. Specification, elaboration, construction, transition, documentation, and use cases are not nonfunctional service level requirements. Hence, choices B and C are incorrect. While scalability and reliability may be related (Will the system perform as reliably when more users operate on it ), there is no mention of reliability in the question. Hence, choice E is incorrect. 3 3. D is correct. The most important consideration when designing an application is that it meets the needs of the customer. A, B, C, E, and F are incorrect. Ensuring the application is produced on time and within budget is something that should be done, but it is not the number one concern. The application does not have to be the best possible solution under the circumstances. As long as it meets the customer s needs, it is considered adequate. All of the other considerations are secondary to meeting the customer s needs.
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