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HW2 - CS 578 Software Architectures Spring 2009 Homework...

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CS 578 – Software Architectures Spring 2009 Homework Assignment #2 Due: Tuesday, March 3, 2009 – see course websites for submission details – During early development phases of a software system, the informal system requirements are often translated into more formal models to allow different types of early analyses and to support subsequent development of more concrete design artifacts. For example, natural language descriptions of the required behavior in particular use cases are commonly represented via sequence diagrams which depict the resulting interactions among the system’s constituent components. Further, different states in the system execution are often captured using state variables, values of which can restrict the possible execution sequences (e.g., we can define pre- and post-conditions on these variables for different component operations). Figure 1 depicts an example system specification diagram of a web caching system. The depicted UML sequence diagram corresponds to the following use case scenario: “When the Client requests a web page that is not cached, the page should be fetched from the Server and returned to the Client.” Additionally, the “OCL-like 1 ” constraints depicted in Figure 1 describe the conditions that should be satisfied in order to invoke a particular operation. For example, the requestServerData operation can be invoked only if the particular page is not cached. Figure 1. Sequence diagram and operation constraints for a simple web caching system. In this assignment we provide a set of high-level natural language specifications of use cases of the C4 system from homework #1. These descriptions also contain hints suggesting possible system states. The provided specifications are reflective of the types of natural language specifications that are often given for real development projects.
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  • Spring '08
  • NENADMEDIDOVIC
  • sequence diagram, UML sequence diagram, ISDN request submission, new business options, natural language specifications

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