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Where Architecture Fits in Analysis, Design, and Development
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In most project alignments, the architects are members of the development team. On a large project, they work with the system designers, team leads, enterprise modelers, developers, testers, QA staff, configuration experts, and business domain experts. On a small team, architects may be playing one or more of these roles. Architects are responsible for interacting with customers, beta testers, and end users to make sure that user requirements are satisfied.
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Architecture vs. Design
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An architect is not a designer. An application architecture s scope is the system s major structure, its architectural design patterns, and the frameworks upon which you can add components. The architecture s concern realizes nonfunctionality, whereas design is concerned with the business use cases to convert the domain object model into a technical object model. Application architecture is the project s structure. The key difference between the terms architecture and design is in the level of details. Architecture operates at a high level of abstraction with less detail. Design operates at a low level of abstraction, obviously with more of an eye to details of implementation. Together, they produce a solution that meets the functional and nonfunctional constraints of the requirements. The solution describes how to perform the task. The architecture addresses structural issues, organizes subsystems, and assigns functionality to components. It defines the protocols for communication, synchronization, and data access; it physically allocates components to processors. Most important, it delivers the architectural design of the component interface specifications.
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At this point, the designers step in and provide internal details of each component in the architecture, including an interface for each component class, the details for input/output, and the data structures and algorithms used. The reality of most situations can cause this separation to break down for the following reasons:
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There may not be enough time to consider the long-term architectural implications of the architectural design and implementation decisions. Architecture is expensive, especially when a new domain such as JEE is being explored. Even when we have the time as well as the inclination to take architectural concerns into account, an architect s experience with a domain can limit the degree of architectural sophistication that can be brought to the system. Developers differ in their levels of skill, as well as in experience. Only people who build a Java class see how it looks inside. Architecture is invisible. Software often reflects the inherent complexity of the application domain. Architecture is a hypothesis of the future. The architecture required for a large project is typically very different from that of smaller ones, making the architect s challenge all the more difficult.
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n Visibility
n Complexity n Change n Scale
Today s architect must comport theory and best practices with the reality of the target system requirement and available resources. For a hierarchical picture of the balancing that is the challenge, see Figure 2-1. As JEE architecture is mature, the deliverables for a JEE architect are typically well defined. The assignment part of Sun s JEE Enterprise Architect certification requires deliverables to be in UML, which is important but sometimes insufficient for real-world JEE applications. To get started, the architecture specification and process require at least the following:
n A system architecture document to describe your existing hardware, software,
network topology, and other components.
n An application architecture document to describe the application s major
structure, including a logical view of all architecturally significant components, use case components, and legacy components.
2: Common Architectures and Protocols
FIGURE 2-1
Balancing architecture, design, and reality
n A components design guideline to describe all design guidelines and
architectural decisions, explain all those decisions, and describe possible consequences if an alternative option is used. These guidelines should capture all-important base determinants that the new component design must respect to maintain the system s architectural integrity.
n An architectural prototype to evaluate new technologies, gain experience
developing and deploying JEE applications, build architectural frameworks, and address risks by measuring performance and scalability, as well as proof of concept for the project stakeholders.
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