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Advice
- In a number of AOP languages, advice consists of a pointcut and a body. The body executes at join points the pointcut matches. This pointcut may expose runtime information to the advice body.
AOSD
Aspect
- Aspects are one kind of concern in software development. With respect to a primary or dominant decomposition aspects are concerns that crosscut that decomposition.
Aspect and Concern Mining
Aspect-Oriented Middleware
Composition
Concern
- A concern is an area of interest or focus in a system. Concerns are the primary criteria for decomposing software into smaller, more manageable and comprehensible parts that have meaning to a software engineer. Examples of concerns include requirements, use cases, features, data structures, quality-of-service issues, variants, intellectual property boundaries, collaborations, patterns and contracts. There are many formulations used to capture concerns as well-identified separate units, aspects are one such mechanism, that are tuned to capturing crosscutting concerns. See More.
Concern and Feature Interaction
Concern Graph/Model
Crosscutting
- A structural relationship between representations of a concern. In this way it is similar to other kinds of structure, like hierarchical structure and block structure. Crosscutting is a different concept from scattering and tangling. See More.
Dominant Decomposition
- Traditional languages and modularization mechanisms suffer from a limitation called the Tyranny of the Dominant Decomposition: the program can be modularized in only one way at a time, and the many kinds of concerns that do not align with that modularization end up scattered across many modules and tangled with one another.
- This description is paraphrased from IBM's T. J. Watson Research center's research on Morphogenic Software. See also, Multi-Dimensional Separation of Concerns.
Dynamic Weaving
Early Aspects
Encapsulation
Feature
Join Point
Join Point Shadow
Module
Modularity
Pointcut
- In a number of AOP languages. a pointcut is a predicate over dynamic join points, meaning that given a certain dynamic join point, a pointcut can either match this join point or not (at runtime). Another view of pointcuts is often, that they represent sets of join points. A pointcut may expose runtime information to a piece of advice.
Product line
Quality-of-Service Aspects
Scattering
- The representation of a concern is scattered over an artifact if it is spread out rather than localized. The representation of concerns are scattered within an artifact if they are intermixed rather than separated. Scattering and tangling often go together, even though they are different concepts. See More.
Separation of Concerns
- In his opening keynote at the first AOSD Conference, Michael Jackson pointed out that Djikstra is the man credited with reminding us of the Roman principle of divide and conquer. Put another way, separation of concerns (SOC) is a long standing idea that simply means a large problem is easier to manage if it can be broken down into pieces; particularly so if the solutions to the sub-problems can be combined to form a solution to the large problem.
- SOC can be supported in many ways: by process, by notation, by organization, by language mechanism and others. Within the broad theme of SOC, AOSD is distinguished by providing new insight on the separation of crosscutting concerns, in particular the idea that single hierarchical structures are too limiting to effectively separate all concerns in complex systems.
Static Weaving
Tangling
- See Scattering.
Weaving
- The process of coordinating aspects and non-aspects. In a language like AspectJ, one part of weaving is ensuring that advice executes at the appropriate dynamic join points. Weaving can be done explicitly or implicitly, and can be done at a variety of times ranging from by-hand weaving when code is written, through compile-time, post-compile time and load time, up to runtime.
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