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Architecture does not contain details about implementation. Architectures are best represented graphically. An architect communicates the design of the system to other members of the team. Defining architecture is a creative process. The creative process can have positive and negative aspects. Architects try to balance creativity with science in the form of models, frameworks, and patterns.
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EXERCISE 2-3 Abstraction, Boundaries, Brittleness, and Capabilities
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Question Explain architectural terms such as abstraction, boundaries, brittleness, and capabilities. Answer An abstraction is a term for something that is factored out of a design so that it can be used repeatedly. Boundaries are the area where two components interact. Brittleness is the degree to which small changes will break large portions of the system. Capabilities are the nonfunctional, observable system qualities, including scalability, manageability, performance, availability, reliability, and security, that are defined in terms of context. Friction is how much interaction occurs between two components. Friction is measured by how a change in one component affects the other. Layering is a hierarchy of separation. Surface area is a list of methods that are exposed to the client. The key difference between architecture and design is in the level of detail.
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EXERCISE 2-4 Fundamentals of System Architecture
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Question Identify the fundamentals of system architecture. Answer System architecture refers to the architecture of a specific construction or system. System architecture corresponds to architecture as a product. It is the result of a design process for a specific system and specifies the functions of components, their interfaces, interactions, and constraints. This specification is the basis for detailed design and implementation steps. Designs may include implementation details not present at the architectural level.
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2: Common Architectures and Protocols
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EXERCISE 2-5 Abstraction
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Question Explain the concept of abstraction and how it is implemented in system architecture. Answer Defining architecture for a system serves multiple objectives. It uses abstraction to factor out commonly used functionality to provide help in representing complex dynamic systems using simple models. This way architecture helps the designer in defining and controlling the interfaces and the integration of the system components. During a redesign process, the architecture enables the designer to reduce the impact of changes to as few modules as possible. The architectural model of a system allows focusing on the areas requiring major change.
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This chapter describes architecture as the practice of designing and building structures. It describes the role played by the architect in the development of computer applications, especially those developed using the JEE standard. It contrasts architecture and design. It covers the fundamentals, capabilities, and design goals of architecture using tables that will be useful in preparing for the exam. The rest of the book s chapters embellish upon the tasks performed by the architect.
Two-Minute Drill
TWO-MINUTE DRILL
Given an Architecture Described in Terms of Network Layout, List Benefits and Potential Weaknesses Associated with It
q Architecture refers to an abstract representation of a system s components and
behaviors. A good system architecture leads to reusable components because each component is broken into parts that may be repeated and can therefore be reused. Abstraction naturally forms layers representing different levels of complexity.
q System architecture corresponds to the concept of architecture as a product.
It is the result of a design process for a specific system and must consider the functions of components, their interfaces, their interactions, and constraints. This specification is the basis for application design and implementation steps.
q Reference architecture corresponds to architecture as a style or method. It refers
to a coherent design principle used in a specific domain.
q 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 the details of implementation.
q The layers of architecture are systems in themselves. They obtain input from
their environment and provide output to their environment.
Recognize the Effect on Each of the Following Characteristics of Two-tier,Three-tier and Multi-tier Architectures: Scalability Maintainability, Reliability, Availability, Extensibility, Performance, Manageability, and Security
q The attributes of a system based on solid architectural principles will include
the following:
q Availability
The degree to which a system is accessible. The term 24 7 describes total availability. This aspect of a system is often coupled with performance. The ability to ensure the integrity and consistency of an application and its transactions.
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