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编程式动态AOP实践

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编程式动态AOP实践

在实际开发中我们经常需要打印日志或者监控方法执行,使用 spring ao 能够很好的实现这个功能,但是切面中的 Pointcut 是固定值,不可被更改,就导致多个应用程序使用功能相同的 aop 需要有大量重复代码,我们希望将这些功能相同的部分封装并抽离为一个公共组件包,能够动态配置 Pointcut

实现思路

从Spring的AOP机制已知,要对一个方法或类切入需要实现以下步骤

  • Pointcut ,实现 spring 中的 Pointcut 接口自定已切入点,根据具体的业务实现

    本文章示例使用 spring 中的 AspectJExpressionPointcut 实现

  • Advisor ,它可以扩展 SpringAbstractBeanFactoryPointcutAdvisor

  • MethodInterceptor , 在此接口中实现拦截逻辑

  • 实例化注入到 spring 容器

具体实践

DynamicPointcutAdvisor 动态切入点

public class DynamicPointcutAdvisor extends AbstractBeanFactoryPointcutAdvisor {
/**
* 表达式
*/
private String expression;
public DynamicPointcutAdvisor(String expression) {
this.expression = expression;
}
public Pointcut aspectJExpressionPointcut() {
AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
pointcut.setExpression(this.expression);
return pointcut;
}
@Override
public Pointcut getPointcut() {
return aspectJExpressionPointcut();
}
}
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DynamicMethodInterceptor 动态方法拦截

@Slf4j
public class DynamicMethodInterceptor implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
long startTime = System.currentTimeMillis();
Object ret;
JSONObject rest = new JSONObject();
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
try {
UserAgent userAgent = UserAgent.parseUserAgentString(request.getHeader("User-Agent"));
rest.put("RequestUrl", request.getRequestURL().toString());
rest.put("RequestType", request.getMethod());
rest.put("RequestHeader", RequestUtils.getHeadersInfo(request));
rest.put("RequestMethod", invocation.getMethod().getName());
rest.put("RequestParams", invocation.getArguments());
rest.put("ServerAddr", StrFormatter.format("{}{}{}{}{}", request.getScheme(), "://", request.getServerName(), ":", request.getServerPort()));
rest.put("RemoteAddr", RequestUtils.getRemoteAddr(request));
rest.put("Browser", userAgent.getBrowser().toString());
rest.put("BrowserVersion", userAgent.getBrowserVersion());
rest.put("operatingSystem", userAgent.getOperatingSystem().toString());
rest.put("requestTime", LocalDateTime.now());
ret = invocation.proceed();
rest.put("responseResult", ret);
} catch (Throwable throwable) {
rest.put("ExceptionName", throwable.getClass().getName());
rest.put("ExceptionMessage", throwable.getMessage());
JSONObject e = new JSONObject();
e.put("ExceptionName", throwable.getClass().getName());
e.put("ExceptionMessage", throwable.getMessage());
log.error(e.toString());
throw throwable;
} finally {
rest.put("Time", System.currentTimeMillis() - startTime);
log.info(rest.toString());
}
return ret;
}
}
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DynamicAdvisorConfiguration 实例化

@Configuration
@ConditionalOnProperty(name = "log.dynamic.pointcut.expression")
public class DynamicAdvisorConfiguration {
@Value("${log.dynamic.pointcut.expression:}")
private String expression;
@Bean(name = "dynamicPointcutAdvisor")
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
public DynamicPointcutAdvisor adapterServiceAdvisor() {
DynamicPointcutAdvisor advisor = new DynamicPointcutAdvisor(expression);
advisor.setAdviceBeanName("dynamicPointcutAdvisor");
advisor.setAdvice(new DynamicMethodInterceptor());
advisor.setOrder(Ordered.HIGHEST_PRECEDENCE);
return advisor;
}
}
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配置文件 application.properties

log.dynamic.pointcut.expression=execution(public * com.devin.dynamic.controller..*.*(..))
log.dynamic.pointcut.expression=true
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结果

[nio-9000-exec-2] c.s.s.a.d.DynamicMethodInterceptor       : {"responseResult":{"code":200,"message":"16003908714631539353"},"RequestMethod":"dynamicNumber","RequestUrl":"http://localhost:9000/dynamic/number","ServerAddr":"http://localhost:9000","Time":52,"RemoteAddr":"0:0:0:0:0:0:0:1","operatingSystem":"WINDOWS_10","RequestParams":[],"requestTime":"2020-03-25T11:26:10.344","RequestHeader":{"accept-language":"zh-CN,en-US;q=0.7,en;q=0.3","host":"localhost:9000","upgrade-insecure-requests":"1","connection":"keep-alive","accept-encoding":"gzip, deflate","user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0","accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"},"BrowserVersion":{"majorVersion":"74","minorVersion":"0","version":"74.0"},"RequestType":"GET","Browser":"FIREFOX7"}
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拓展 Pointcut

spring 默认有一些切入点的实现,我们只需要实例化就可以了

但是对于不满足我们需求的可以通过实现 Pointcut 接口实现。

package org.springframework.aop;
public interface Pointcut {
Pointcut TRUE = TruePointcut.INSTANCE;
ClassFilter getClassFilter();
MethodMatcher getMethodMatcher();
}
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其他的请自行探索。

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