AOP中的几个重要概念

Aspect

An aspect is the cross-cutting functionality you are implementing. It is the aspect,

or area, of your application you are modularizing. The most common (albeit simple)

example of an aspect is logging. Logging is something that is required

throughout an application. However, because applications tend to be broken

down into layers based on functionality, reusing a logging module through inheritance

does not make sense. However, you can create a logging aspect and apply it

throughout your application using AOP.

Joinpoint

A joinpoint is a point in the execution of the application where an aspect can be

plugged in. This point could be a method being called, an exception being

thrown, or even a field being modified. These are the points where your aspect’s

code can be inserted into the normal flow of your application to add new behavior.