Aspect Oriented Programming

    Aspect Oriented Programming

Aspect Oriented Programming (AOP) compliments OOPs in the sense that it also provides modularity. But the key unit of modularity is aspect than class.

AOP breaks the program logic into distinct parts (called concerns). It is used to increase modularity by cross-cutting concerns.

A cross-cutting concern is a concern that can affect the whole application and should be centralized in one location in code as possible, such as transaction management, authentication, logging, security etc

AOP Concepts and Terminology

AOP concepts and terminologies are as follows:

• Join point
• Advice
• Pointcut
• Introduction
• Target Object
• Aspect
• Interceptor
• AOP Proxy
• Weaving

Advice

Advice represents an action taken by an aspect at a particular join point. There are different types of advices:

• Before Advice: it executes before a join point.
• After Returning Advice: it executes after a joint point completes normally.
• After Throwing Advice: it executes if method exits by throwing an exception.
• After (finally) Advice: it executes after a join point regardless of join point exit whether normally or exceptional return.
• Around Advice: It executes before and after a join point.