#What does aop framework do code

Target Object:В These are the objectsВ on which advices are applied.

Pointcut: A PointcutВ is an expression that is matched with join points to determine whether advice needs to be executed or not.

Advice: AdviceВ are the specific actions taken for a particular joinpoint.В Basically, they are the methods that get executed when a certain joinpoint meets a matching pointcut in the application.

It could be a method that is being called, an exception being thrown, or even a field being modified. It can also be regular classes annotatedВ using Joinpoint: The joinpointВ is a candidateВ point in theВ program executionВ where an aspect can be plugged in.

Aspect: The aspectВ is nothing but a class that implements the JEE application concerns which cut through multiple classes,В such as transaction management, security etc.В Aspects can be a normal class configured through Spring XML configuration.

Spring AOP consists of 7 core concepts which are depicted in the following diagram: Now letвЂ™s move further in this Spring AOP Tutorial blog and understand some core concepts of Aspect Oriented Programming.

ThatвЂ™s the whole concept of why we need Aspect Oriented Programming in Springs. Suppose in future, if a client says to remove the notifier functionality, we need to change only in the XML file. We can simply define the additional concern like maintaining a log, sending notification etc. The solution with AOPвЂ“ With AOP, we donвЂ™t have to call methods from the method. But, in case if a client says in future, I donвЂ™t have to send a notification, you need to change all the methods.

#What does aop framework do code

In such a scenario, we need to write the code in all the 5 methods. So what is the problem without AOP? Here, We can call methods (that maintains a log and sends notification) from the methods starting with a. You can see that there are 5 methods that start from a, 2 methods that start from b and 3 methods that starts from c.ДЇirst, letвЂ™s understand Scenario- Here ,В I have to maintain a log and send notification after calling methods that start from m. Suppose there are 10 methods as shown in the figure: The most important functionality is AOP provides the pluggable way to dynamically add the additional concern before, after or around the actual logic. Now, letвЂ™s move further and see why we need AOP. I hope you understood the concepts of AOP and cross-cutting concerns. So, you can add/remove c/concerns without recompiling complete source code simply by changing configuration files (if you are applying aspects suing XML configuration). By doing this, it makes easy to maintain code in the present and future as well. In this case, AOP provides a way to dynamically add the cross-cutting concern before, after or around the actual logic using simple pluggable configurations. Here, aspects enable the modularization of concerns such as transaction management, logging or security that cut across multiple types and objects (often termed crosscutting concerns). As we know Spring AOP enables Aspect-Oriented Programming in spring applications. It is used to increase modularity by cross-cutting concerns.ДЄ cross-cutting concernВ is the one that affects the whole application and should be centralized under the same block in the code, such as transaction management, authentication, logging, security etc. Here, AOP breaks the program logic into distinct parts (called concerns). But, the key unit of modularity here is considered asВ an aspect rather than class.

Introduction to AOPДЄspect Oriented ProgrammingВ (AOP) compliments OOPs because it provides modularity.

You may also go through this recording of Spring AOP Tutorial Concepts where you can understand the topics in a detailed manner with examples.