What is the difference between a join point and a pointcut?
A Joinpoint is a point in the control flow of a program where the control flow can arrive via two different paths(IMO : that’s why call joint). A Pointcut is a matching Pattern of Joinpoint i.e. set of join points.
What is pointcut expression?
Pointcut is an expression language of spring AOP which is basically used to match the target methods to apply the advice. It has two parts ,one is the method signature comprising of method name and parameters. Other one is the pointcut expression which determines exactly which method we are applying the advice to.
What events are part of the join point model in AspectJ?
The join points in AspectJ include method or constructor call or execution, the initialization of a class or object, field read and write access, exception handlers, etc.
What is pointcut annotation?
Pointcut is a set of one or more JoinPoint where an advice should be executed. You can specify Pointcuts using expressions or patterns as we will see in our AOP examples. In Spring, Pointcut helps to use specific JoinPoints to apply the advice.
What is pointcut and advice?
Pointcut is a predicate or expression that matches join points. Advice is associated with a pointcut expression and runs at any join point matched by the pointcut. Spring uses the AspectJ pointcut expression language by default.
What is advice in AspectJ?
AspectJ supports three kinds of advice. The kind of advice determines how it interacts with the join points it is defined over. Thus AspectJ divides advice into that which runs before its join points, that which runs after its join points, and that which runs in place of (or “around”) its join points.
Which list of five advice types is correct in spring AOP?
Run advice after the method execution, regardless of its outcome. Run advice after the method execution, only if the method completes successfully. Run advice after the method execution, only if the method exits by throwing an exception. Run advice before and after the advised method is invoked.
What methods does this pointcut expression reference @target?
This pointcut matches any method that starts with find and has only one parameter of type Long. If we want to match a method with any number of parameters but having the fist parameter of type Long, we could use the following expression: @Pointcut(“execution(* *.. find*(Long,..))”)
What is the use of pointcut in Spring?
In Spring AOP, a joinpoint always represents a method execution. Pointcut is a predicate or expression that matches join points. Advice is associated with a pointcut expression and runs at any join point matched by the pointcut. Spring uses the AspectJ pointcut expression language by default.