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Steps in Software Development
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Knowing we must make many architectural decisions, we establish a process for architecture development. The typical steps in software development include requirement analysis or the problem statement, object-oriented analysis and architectural analysis, object-oriented design and architectural design, and ultimately the object creation.
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Requirement Analysis/Problem Statement This phase involves the domain specification of the software in need. Suppose, for example, that we want to create a bookstore application that is accessible from the web. An example outcome of this phase would be the domain in other words, what types of functionality do we need and whether or not the system being specified is feasible. The software s functionality would include interface features that users would like to see: interfaces to retrieve
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Architectural Design and Principles
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information regarding the books available in the company and those that would allow users to purchase books online using a credit card. The requirement analysis describes what the system should do so that developers and customers can create a business contract. Analysts generate domain models: classes, objects, and interactions. The requirement analysis should theoretically be free from any technical or implementation details and should contain an ideal model. The result of requirement and object analyses is the entry point for JEE architecture development. You can apply experience to domain objects, and let that knowledge serve as a design guideline for the object design stage. Enterprise-wide system architecture covers hardware and software infrastructure, network topology, development, testing, production environment, and other factors. Before development, you want to evaluate existing software and hardware infrastructure and perhaps add components and upgrade your existing system if it cannot fully support JEE. You need to evaluate hardware, including computers, routers, network switches, and network topology, as they all impact system performance and reliability.
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Object-Oriented/Architectural Analysis This phase involves the analysis of the domain. The requirement analysis sets the boundary for this phase. A modeling tool using UML might be used (more on this in 3). The analysts would do the following:
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n Develop use case diagrams for all the business processes. Use case diagrams
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are high-level descriptions of the system actors and the system functionality.
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n Develop sequence diagrams. These diagrams show the sequence of operation
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as a function of time.
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n Develop class diagrams. Class diagrams show the system functionality as
classes and their methods.
n Develop collaboration diagrams. Collaboration diagrams depict how the
classes interact.
Architectural Design This phase involves creating the architectural design for the software. The development of the architecture is based on the output of the object-oriented analysis. This phase tries to give a framework within which all the components will work to satisfy all the customer requirements. In this phase, implementation details are not documented. The outcome would be to decide upon and document the architecture. For example, the architect must decide which framework to use JEE, CORBA (Common Object Request Broker), RMI (Remote
2: Common Architectures and Protocols
Method Invocation), or DCOM (Distributed Component Object Model), for example. (These frameworks are discussed later in the chapter.) Any new hardware and software requirements are defined, along with how security will be handled. The architect would also define how performance is achieved. Pragmatically, the architect would work out a solution that takes into account security, performance, and cost, as well as considers reusing existing technology and business logic in the legacy system. In a typical enterprise, many application projects are underway in a partial state of development some of which could span years, resulting in system evolution of many cycles. As a result, common frameworks, reusable software architectures that provide the generic structure and behavior, are needed for a family of software applications. From the object-oriented design perspective, the architect would do the following:
n Develop package dependency diagrams. n Decide how the classes in different packages interact. n Develop deployment diagrams. n Decide where the software components will reside in deployment.
Guided by architectural specifications, the design technically adapts the analysis result. While domain object modeling at the analysis phase should be free from technical details, the object design fully accounts for technical factors, including what kind of platform, language, and vendors are selected in the architecture development stage. Guided by architectural decisions, a detailed design effort should address specification of all classes, including the necessary implementation attributes, their detailed interfaces, and code or plain text descriptions of the operation. With a good architecture and detailed design, implementation should be clear. In many organizations, developers often arrive at the implementation stage too early. This problem is compounded when managers pressure the developer to ensure they re writing code, since to them, anything else is a waste of time.
Object-Oriented Design and Creation In this phase, the design for the implementation is complete, and the decision is made as to whether the client tier
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