AspectJ Pointcuts的说明

最新推荐文章于 2023-05-29 21:14:21 发布

gokisang

最新推荐文章于 2023-05-29 21:14:21 发布

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文章标签： AOP performance

本文链接：https://blog.youkuaiyun.com/gokisang/article/details/83874779

本文介绍了面向切面编程(AOP)的配置方法，并通过一个具体示例展示了如何定义切入点(pointcut)及如何在不同切面(aspect)中复用这些定义。此外，还讨论了如何使用before、after-returning及after-throwing等通知(advice)。

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<aop:config>
  <aop:aspect ref="audience">
    <aop:pointcut
        id="performance"
        expression="execution(* *.perform(..))" />
    <aop:before
        method="takeSeats"
        pointcut-ref="performance" />
    <aop:before
        method="turnOffCellPhones"
        pointcut-ref="performance" />
    <aop:after-returning
        method="applaud"
        pointcut-ref="performance" />
    <aop:after-throwing
        method="demandRefund"
        pointcut-ref="performance" />
  </aop:aspect>
</aop:config>

the <aop:pointcut> element defines a pointcut that can be referenced by all advices within the same <aop:aspect> element(在一个aspect中可以随处应用). But you can

also define pointcuts that can be used across multiple aspects by placing the

<aop:pointcut> elements within the scope of the <aop:config> element(跨越多个aspect).如下：

<aop:config>
<aop:pointcut
        id="performance"
        expression="execution(* *.perform(..))" />
  <aop:aspect ref="audience">
    <aop:before
        method="takeSeats"
        pointcut-ref="performance" />
    <aop:before
        method="turnOffCellPhones"
        pointcut-ref="performance" />
    <aop:after-returning
        method="applaud"
        pointcut-ref="performance" />
    <aop:after-throwing
        method="demandRefund"
        pointcut-ref="performance" />
  </aop:aspect>
</aop:config>