Read e-book online AspectJ in Action: Practical Aspect-Oriented Programming PDF

By Ramnivas Laddad

ISBN-10: 1930110936

ISBN-13: 9781930110939

A software program method is the belief of a suite of issues. one of many vital premises of object-oriented programming is that every situation will be applied as a separate module. even if, there are specific system-wide matters, reminiscent of logging, safety, functionality, etc, that regularly have to be addressed in lots of, if no longer all the modules. hence, the code to address those system-wide matters can be jumbled in with the center common sense of a big variety of modules, leading to decrease productiveness, bad caliber, and structures which are difficult to conform. Aspect-oriented programming overcomes those difficulties by means of modularizing the system-wide matters.

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Additional resources for AspectJ in Action: Practical Aspect-Oriented Programming

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This step separates core-level concerns from crosscutting, system-level concerns. 1, we would identify the following concerns: core business logic, logging, cache management, thread safety, contract enforcement, persistence, and authorization. Of these, only the core business logic is the core concern of SomeBusinessClass. All other concerns are system wide concerns that will be needed by many other modules and therefore are classified as crosscutting concerns. 2 Concern implementation—In this step, you implement each concern independently.

Several methodologies—generative programming, meta-programming, reflective programming, compositional filtering, adaptive programming, subject-oriented programming, aspect-oriented programming, and intentional programming—have emerged as possible approaches to modularizing crosscutting concerns. AOP is the most popular among these. To learn more about the other methodologies and their history, see the “Resources” section at the end of this book. Much of the early work that led to AOP today was done in universities all over the world.

In addition to system concerns, a software project needs to address process concerns, such as comprehensibility, maintainability, traceability, and ease of evolution. As we saw in the examples at the beginning of this chapter, a concern can be classified into one of two categories: core concerns capture the central functionality of a module, and crosscutting concerns capture system-level, peripheral requirements that cross multiple modules. A typical enterprise application may need to address crosscutting concerns, such as authentication, logging, resource pooling, administration, performance, storage management, data persistence, security, multithread safety, transaction integrity, error checking, and policy enforcement, to name just a few.

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AspectJ in Action: Practical Aspect-Oriented Programming by Ramnivas Laddad

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