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Advices in Spring Framework
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Introduction: Implementation of a concerns is called Advice. It means that concerns represent a task i.e performed as part of an operation. Any operation are implemented through the concern is called Advices.

Type of Advices in Spring Framework

There are four type of advices in spring framework which are following:

  1. Before Advice
  2. After Advice
  3. Around Advice
  4. After Throws Advice

Before Advice: This Spring Before advice provide the service before invoking the method. It means that Before advices represent those concern which are to be applied before a method is invoked. Which are applied in Validation, Authorization, etc. are the task which can be implemented using before advice.

Framework provide an interface named "MethodBeforeAdvice" this interface provide a method that is used by application developer to define the task that are to be executed before the invocation target method.

After Advice: After advice represents those task which are to be performed after the completion of method. A Spring Framework implements After Advice are invoked from the implementation of AfterReturningAdvice interface.

This interface provide a method name AfterReturning which is invoked InvocationHandler after the actual method completed. Through this method reference of target method, argument, method object and value returned by the Object are provided to the developer. Application developer may used the return value but can not change it.

Around Advice: An around advice are used when some operations are to be performed before and after method call and controlled over the return value of the method is to be gain.

To apply around advice implementation of "MethodInterceptor" interface need to be provided by the developer. This interface provide a method name invoke which received parameter of type of Invocation. MethodInvocation Object encapsulate invocation of the actual method of the target object and exposes the method name proceed() which is used by application developer to get the actual method invoked.

After Throws Advice: An after throws advice is used to performed some operation between throwing and catching an exception.

To implements after throws advice implementation of "ThrowsAdvice" interface need to be provided. It is the marker interface. The class which implements this interface can define a method name afterThrowing() which can have either of the following signature.

public void afterThrowing(Exception e);
public void afterThrowing(Methid m, Object[] arg, Object target);
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