第2章計算論的思考と設計の再利用性

Architecture views are representations of the overall system design that matter to different stakeholders. In addition to the application, data, and technology architecture models, IT architects create specific views to communicate and ensure that the system meets the needs of various stakeholders. An architecture is typically conveyed through one or more architecture models that collectively offer a clear description of the system’s structure. A singular, all-encompassing model is often too intricate to be easily grasped, displaying every intricate relationship among diverse business and technical elements.

Just as an architect designs different aspects of a building, such as wiring diagrams for electricians, floor plans for owners, and elevations for planners to address their unique needs, the architecture of an information system is similarly broken down into various views for effective communication among its stakeholders. In the IT world, for example, an architect might create specific views of the system’s physical layout and security measures. These tailored views ensure that stakeholders, each with their own concerns and areas of focus, have a clear understanding of the system’s components relevant to their interests.

After identifying business and technical characteristics through the diagrams discussed in the previous section, solution models can be developed, and implementations can be created. This involves constructing new components as necessary and combining them with reusable design components obtained from a pattern catalog. If implementations of these reusable components already exist and can be customized, the implementation of the solution becomes much faster. This approach helps avoid reinventing the wheel and developing software components or systems that already exist, focusing instead on assembling existing components for efficiency.

Figure 2.23 illustrates the key dimensions for representing and categorizing architecture models, accompanying diagrams, and related patterns. These architecture domains align with the TOGAF standard, as discussed earlier. The diagram also illustrates the levels of abstraction to characterize various architectural models. Additionally, it introduces the architecture scope as another dimension, classifying the models’ breadth of applicability at the enterprise, portfolio, or project level. The architecture scope is the extent and boundaries within which architectural considerations, decisions, and solutions apply.

Portfolio- or domain-level architectures usually concentrate on collections of solutions and projects associated with a specific business unit, like marketing or sales in a large organization. In contrast, project- or system-level architecture is geared toward individual solutions and projects within those business units. Defining the scope of a model is crucial because there exists a direct relationship between the scope and the level of detail achievable in a blueprint. This is due to the necessity for increased generalization, such as simplification, feature selection, and grouping, as the blueprint’s scope expands.

Adaptive design reuse can significantly benefit people in everyday life by promoting efficiency, sustainability, and improved user experiences. Imagine a neighborhood called EcoHomes, where all the houses are built using old materials from buildings that were taken down or left unused. It is all about making new homes without needing to produce or buy more materials, which helps the environment. In EcoHomes, architects and builders take things like bricks, glass, and wood from old sites and use them to build new, modern houses. For example, wooden beams from an old barn become part of the living room in a new house, adding a cool, old-time feel to a modern design. Windows from an old office building let in lots of sunlight, cutting down on the need for electric lights. EcoHomes is a hit because it shows how reusing building materials can save money and help the planet. The people living there have lower energy bills and are proud of their unique, eco-friendly homes. This story shows how using what we already have in new ways can make a big difference for our wallets and the world.