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

By Ramnivas Laddad

A software program process is the belief of a collection of issues. one of many important premises of object-oriented programming is that every predicament might be applied as a separate module. notwithstanding, there are specific system-wide matters, resembling logging, safety, functionality, and so on, that frequently have to be addressed in lots of, if now not all the modules. hence, the code to address those system-wide matters should be jumbled in with the middle common sense of a massive variety of modules, leading to decrease productiveness, bad caliber, and platforms which are challenging to adapt. Aspect-oriented programming overcomes those difficulties through modularizing the system-wide matters.

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The “Ysleno Moluco” is just one of many figures in this colorful collection. Their diversity speaks vividly of the uniqueness and individuality of the world’s towns and regions just 200 years ago. This was a time when the dress codes of two regions separated by a few dozen miles identified people uniquely as belonging to one or the other. The collection brings to life a sense of isolation and distance of that period—and of every other historic period except our own hyperkinetic present. Dress codes have changed since then and the diversity by region, so rich at the time, has faded away.

The question is, could you have made those choices with the information you had then? Although in theory the concerns could have been addressed with foresight, even if only partially, in real life it just doesn’t work that way. For example, should an architect consider performance-related requirements in the beginning phases of a project? The usual approach is to build the system, profile it, and retrofit it with optimizations to improve performance. This approach calls for potentially changing many parts of the system using profiling.

Note that regardless of the approach taken, the weaver does not modify the original source code. Another approach could be that the source code would first be compiled into class files using the base language compiler. The class files would then be fed to the aspect compiler, which would weave the aspects into the class files to produce woven class files. 11 shows a schematic of a compiler-based AOP language implementation. Other implementations would be similar, but with the location and the process of the weaving changed appropriately.

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