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D. Applying Tactics (Bonus) 1) Based on your design decision for the BIzCo BIS, what quality would you like to improve? 2) What tactics would you choose to improve your design of the messaging infrastructure for the system? 3) Consider the tradeoffs. What are the issues associated with the selection of those tactics? In this exercise, your task is to propose a design for the Messaging Infrastructure layer of the new Brokerage Information System (BIS) for the BizCo company. To accomplish this, you must select a pattern and instantiate it, modifying the architecture to meet the quality attribute requirements for the company. BizCo Business Goals To establish BizCo as the industry leader in brokering appraisal for commercial and residential properties. We must: - Increase market share of brokerage services - Dramatically decrease response time to changing market conditions - Have direct, secure access to brokerage information 24/7 - Have reporting that aggregates, collates, and communicates timely information clearly and as needed BizCo Business Processes A real estate appraisal is needed to secure a mortgage loan when purchasing a property. A real estate appraisal is performed by licensed appraisers who work as independent contractors. As a real estate appraisal broker, BizCo connects the lender with an independent appraiser. The typical workflow at a BizCo branch office begins with a Service Agreement between BizCo and lenders, and between Bizco and appraisers. The Service Agreement Management business process establishes and records the service agreements. The Appraisal Request Management business process records appraisal requests and routes residential and commercial requests differently pairing commercial and residential appraisals with commercial and residential appraisers and routes the requests accordingly. Once the property has been appraised, the Appraisal Fulfilment process records the appraisal results, and notifies the Billing process to bill the lender and pay the appraiser according to their service agreement. BizCo Information Systems Three standalone systems operate at each BizCo branch. Please note that the systems are not integrated within the branch and do not integrate externally. Tahle 2 - RizCon Existina Information Sustems ner Rranch Table 3. X indicates system support for a business process BizCo Information Reporting CPS, RPS, and BBS at each branch generate reports independently - Summarize brokerage activities - Biweekly - Hard-copy - Sent to main office in Pittsburgh via courier BizCo Brokerage Information System (BIS) - the Proposed System BizCo needs to gather more extensive information from the branch offices' existing systems in a timely manner. To this end, your organization plans to develop the new Brokerage Information System (BIS). The BIS must allow the main office to display information on: - Branch office, lender, and appraiser business address and contacts - Contract terms and conditions for lenders and appraisers - Appraisal requests submitted, assigned, and fulfilled - Brokerage activities across and for individual branch offices - Brokerage activities across and for individual lenders, appraisers, and brokers - Account receivables aggregated among all offices BizCo BIS Software Architecture The BizCo systems architect has designed a Layered Architecture, consisting of four layers, as a module structure for the new system, encapsulating the three existing systems, CPS, RPS, and BBS. A. Use case Diagram From your understand of the system and assumption, draw use case diagram and construct a table that explain each use case. B. Identify the quality attribute requirements. 1) Create a utility tree for the current system. Consider a minimum of four different quality attributes. Ensure that the goals and scenarios that you elucidated at the leaf nodes have explicit responses and response measures. 2) Using the following table, write down what you think are the most important quality attributes for the Messaging Infrastructure layer and prioritize their relative importance on a scale from 1 to n, where 1 is most important quality attribute requirement for the messaging infrastructure and n is the least important. Then you should justify your choice for each quality attribute. C. Design the Messaging Infrastructure Layer Now you can begin designing the Messaging Infrastructure layer using one of three patterns: Messaging, Publisher-Subscriber, or SOA. In this step you must first consider the patterns, weighing the pros and cons of each, and the tradeoffs from a quality attribute perspective. Read about and consider the Messaging, Publisher-Subscriber, and SOA patterns. Figure 3 Messaging Pattem, Sequence Diagram of Services Interactions The Publisher-Subscriber Pattern Adapted from SEI at CMU Dynamic Routing Pattern (SOA) Dynamic Routing Pattern (SOA) Figure 5 Dynamic Routing Pattem, Sequence diagram for services interactions Adapted from SEI at CMU Dow the following: 1) Using the above description, select and draw the pattern that you think will best meet the messaging infrastructure requirements. Instantiate the pattern by describing the roles of its constituent participants, their responsibilities and relationships, and the ways in which they collaborate. 2) Fill out the table and identify the tradeoffs using this pattern. \begin{tabular}{|l|l|} \hline Pattern & \\ \hline Overview & \\ \hline Tradeoffs & \\ \hline Elements & \\ \hline Relations & \\ \hline \end{tabular} D. Applying Tactics (Bonus) 1) Based on your design decision for the BIzCo BIS, what quality would you like to improve? 2) What tactics would you choose to improve your design of the messaging infrastructure for the system? 3) Consider the tradeoffs. What are the issues associated with the selection of those tactics