Most trickiest Spring Boot AOP Interview Questions for Experienced | AOP Advice | Code Decode
In this video of code decode we have explained AOP Advice which is the most trickiest question of Spring boot AOP
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Aspect and Advice in Aspect-Oriented Programming
Aspect-Oriented Programming (AOP) is a programming paradigm that aims to modularize system-wide concerns, such as logging, security checks, and error handling, by separating them from the core business logic. A key concept in AOP is the aspect, which is represented by a class where we define pointcuts and advices.
An advice is the behavior that addresses system-wide concerns and is associated with a specific join point in the program execution flow. It is represented by a method that will be executed at the designated join point. There are different types of advice, including before, after returning, after throwing, after, and around.
A pointcut is an expression that defines the join points where a particular advice should be applied. It specifies the conditions under which an advice will be triggered. For example, a pointcut may specify that an advice should be executed before a certain method is invoked or after a method throws an exception.
Join points are specific points in the program execution flow where aspects can be plugged in. They represent the different stages or events in a program's lifecycle where the advice can be applied. Examples of join points include method invocations, method executions, field access, and exception handling:
This advice executes before a join point, but it does not have the ability to prevent the execution flow from proceeding to the join point unless an exception is thrown. It is commonly used for tasks such as logging or security checks that need to be performed before a method is executed.
This advice is executed after a join point completes normally, i.e., without throwing an exception. It is often used for tasks like resource cleanup or updating caches.
This advice is executed if a method exits by throwing an exception. It allows you to handle exceptions and perform appropriate actions, such as logging or error handling.
This advice is executed regardless of how a join point exits, whether it is through normal return or by throwing an exception. It can be used for tasks like resource cleanup or releasing locks.
This is the most powerful advice type. It surrounds a join point, such as a method invocation, and has the ability to prevent the actual method execution. It takes a ProceedingJoinPoint as a parameter, which allows you to execute the target method. By calling the proceed() method on the ProceedingJoinPoint, you can proceed with the original method execution.
The order in which advice is invoked depends on the advice type. In the case of advice, it is invoked first, followed by advice. This allows the advice to control the method execution and decide whether to proceed or return a response on behalf of the method.
In summary, AOP introduces the concept of aspects, which are represented by classes containing pointcuts and advices. Advices are the behaviors that address system-wide concerns and are associated with specific join points. Pointcuts define where the advices should be applied. There are different types of advice, including and Each type of advice provides a different way to intercept and modify the program's execution flow. The advice is the most powerful, as it can prevent method execution and modify the arguments and return values.
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