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Aspects Oriented Programming(AOP) with Spring

Aspect-Oriented Programming (AOP) complements Object-Oriented Programming (OOP) by providing another way of thinking about program structure.

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Aspect Oriented Programming Core Concepts

a modularization of a concern that cuts across multiple classes. Transaction management is a good example of a crosscutting concern in enterprise Java applications.

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AOP Advice Types

Based on the execution strategy of advices, they are some following types.

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Spring AOP capabilities and goals

Spring AOP is implemented in pure Java. There is no need for a special compilation process.

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AOP Proxies

Spring AOP defaults to using standard JDK dynamic proxies for AOP proxies. This enables any interface (or set of interfaces) to be proxied.

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AOP Implementations

AOP implementations are provided by several ways.

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XML Schema Based AOP with Spring

In this chapter we will see that Implementation of AOP based on XML Schema. Before using the AOP

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Declaring an aspect

Using the schema support, an aspect is simply a regular Java object defined as a bean in your Spring application context.

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Declaring a pointcut

A named pointcut can be declared inside an element, enabling the pointcut definition to be shared across several aspects and advisors.

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Declaring advices

There are five types of Advices as follows

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After returning advice

After returning advice runs when a matched method execution completes normally.

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After throwing advice

After throwing advice executes when a matched method execution exits by throwing an exception.

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After (finally) advice in Spring

After (finally) advice runs however a matched method execution exits. It is declared using the after element

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Around advice

The final kind of advice is around advice. Around advice runs \"around\" a matched method execution.

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XML Schema Based AOP Example

In this section we provide complete Example of XML Schema Based AOP in Spring.

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@AspectJ Based AOP with Spring

In this section we provide @AspectJ Based AOP with Spring in detail.

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Declaring an aspect

In this section we provide to declare an Aspect.

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Declaring a pointcut

A pointcut helps in determining the join points (ie methods) of interest to be executed with different advices.

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Declaring advices

Advice is associated with a pointcut expression, and runs before, after, or around method executions matched by the pointcut.

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After returning advice

After returning advice runs when a matched method execution returns normally.

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After throwing advice

After throwing advice runs when a matched method execution exits by throwing an exception.

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After (finally) advice in Spring

After (finally) advice runs however a matched method execution exits. It is declared using the @After annotation.

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Around advice

Around advice runs \"around\" a matched method execution. It has the opportunity to do work both before and after the method executes,

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@AspectJ Based AOP Example

To understand the concepts related to @AspectJ based AOP, let us write an example which will implement few of the advices.

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