现在有这么一个需求：就是我们日志的开与关是交给使用人员来控制的，而不是由我们开发人员固定写死的。大家都知道可以用aop来实现日志管理，但是如何动态的来实现日志管理呢？aop源码中的实现逻辑中有这么一个步骤，就是会依次扫描Advice的实现类，然后执行。我们要做的就是自定义一个advice的实现类然后，在用户想要开启日志的时候就把advice加到项目中来，关闭日志的时候就把advice剔除就行了。
org.aopalliance.aop.Advice
“通知”，表示 Aspect 在特定的 Join point 采取的操作。包括 “around”, “before” and “after 等 Advice，大体上分为了三类：BeforeAdvice、MethodInterceptor、AfterAdvice
org.springframework.aop.Advisor
“通知者”，它持有 Advice，是 Spring AOP 的一个基础接口。它的子接口 PointcutAdvisor 是一个功能完善接口，它涵盖了绝大部分的 Advisor。
org.springframework.aop.framework.Advised
AOP 代理工厂配置类接口。提供了操作和管理 Advice 和 Advisor 的能力。它的实现类 ProxyFactory 是 Spring AOP 主要用于创建 AOP 代理类的核心类。
基于 Spring Boot + MyBatis Plus + Vue & Element 实现的后台管理系统 + 用户小程序，支持 RBAC 动态权限、多租户、数据权限、工作流、三方登录、支付、短信、商城等功能
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项目地址：https://github.com/YunaiV/ruoyi-vue-pro
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视频教程：https://doc.iocoder.cn/video/
基于 Spring Cloud Alibaba + Gateway + Nacos + RocketMQ + Vue & Element 实现的后台管理系统 + 用户小程序，支持 RBAC 动态权限、多租户、数据权限、工作流、三方登录、支付、短信、商城等功能
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项目地址：https://github.com/YunaiV/yudao-cloud
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视频教程：https://doc.iocoder.cn/video/
1、动态管理advice端点实现
@RestControllerEndpoint(id = "proxy")
@RequiredArgsConstructor
public class ProxyMetaDefinitionControllerEndPoint {
private final ProxyMetaDefinitionRepository proxyMetaDefinitionRepository;
@GetMapping("listMeta")
public List getProxyMetaDefinitions(){
return proxyMetaDefinitionRepository.getProxyMetaDefinitions();
}
@GetMapping("{id}")
public ProxyMetaDefinition getProxyMetaDefinition(@PathVariable("id") String proxyMetaDefinitionId){
return proxyMetaDefinitionRepository.getProxyMetaDefinition(proxyMetaDefinitionId);
}
@PostMapping("save")
public String save(@RequestBody ProxyMetaDefinition definition){
try {
proxyMetaDefinitionRepository.save(definition);
return "success";
} catch (Exception e) {
}
return "fail";
}
@PostMapping("delete/{id}")
public String delete(@PathVariable("id")String proxyMetaDefinitionId){
try {
proxyMetaDefinitionRepository.delete(proxyMetaDefinitionId);
return "success";
} catch (Exception e) {
}
return "fail";
}
}
2、利用事件监听机制捕获安装或者卸载插件
@RequiredArgsConstructor
public class ProxyMetaDefinitionChangeListener {
private final AopPluginFactory aopPluginFactory;
@EventListener
public void listener(ProxyMetaDefinitionChangeEvent proxyMetaDefinitionChangeEvent){
ProxyMetaInfo proxyMetaInfo = aopPluginFactory.getProxyMetaInfo(proxyMetaDefinitionChangeEvent.getProxyMetaDefinition());
switch (proxyMetaDefinitionChangeEvent.getOperateEventEnum()){
case ADD:
aopPluginFactory.installPlugin(proxyMetaInfo);
break;
case DEL:
aopPluginFactory.uninstallPlugin(proxyMetaInfo.getId());
break;
}
}
}
3、安装插件
public void installPlugin(ProxyMetaInfo proxyMetaInfo){
if(StringUtils.isEmpty(proxyMetaInfo.getId())){
proxyMetaInfo.setId(proxyMetaInfo.getProxyUrl() + SPIILT + proxyMetaInfo.getProxyClassName());
}
AopUtil.registerProxy(defaultListableBeanFactory,proxyMetaInfo);
}
4、安装插件核心实现
public static void registerProxy(DefaultListableBeanFactory beanFactory,ProxyMetaInfo proxyMetaInfo){
AspectJExpressionPointcutAdvisor advisor = getAspectJExpressionPointcutAdvisor(beanFactory, proxyMetaInfo);
addOrDelAdvice(beanFactory,OperateEventEnum.ADD,advisor);
}
private static AspectJExpressionPointcutAdvisor getAspectJExpressionPointcutAdvisor(DefaultListableBeanFactory beanFactory, ProxyMetaInfo proxyMetaInfo) {
BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition();
GenericBeanDefinition beanDefinition = (GenericBeanDefinition) builder.getBeanDefinition();
beanDefinition.setBeanClass(AspectJExpressionPointcutAdvisor.class);
AspectJExpressionPointcutAdvisor advisor = new AspectJExpressionPointcutAdvisor();
advisor.setExpression(proxyMetaInfo.getPointcut());
advisor.setAdvice(Objects.requireNonNull(getMethodInterceptor(proxyMetaInfo.getProxyUrl(), proxyMetaInfo.getProxyClassName())));
beanDefinition.setInstanceSupplier((Supplier) () -> advisor);
beanFactory.registerBeanDefinition(PROXY_PLUGIN_PREFIX + proxyMetaInfo.getId(),beanDefinition);
return advisor;
}
5、卸载插件
public void uninstallPlugin(String id){
String beanName = PROXY_PLUGIN_PREFIX + id;
if(defaultListableBeanFactory.containsBean(beanName)){
AopUtil.destoryProxy(defaultListableBeanFactory,id);
}else{
throw new NoSuchElementException("Plugin not found: " + id);
}
}
6、卸载插件核心实现
public static void destoryProxy(DefaultListableBeanFactory beanFactory,String id){
String beanName = PROXY_PLUGIN_PREFIX + id;
if(beanFactory.containsBean(beanName)){
AspectJExpressionPointcutAdvisor advisor = beanFactory.getBean(beanName,AspectJExpressionPointcutAdvisor.class);
addOrDelAdvice(beanFactory,OperateEventEnum.DEL,advisor);
beanFactory.destroyBean(beanFactory.getBean(beanName));
}
}
7、操作advice实现
public static void addOrDelAdvice(DefaultListableBeanFactory beanFactory, OperateEventEnum operateEventEnum,AspectJExpressionPointcutAdvisor advisor){
AspectJExpressionPointcut pointcut = (AspectJExpressionPointcut) advisor.getPointcut();
for (String beanDefinitionName : beanFactory.getBeanDefinitionNames()) {
Object bean = beanFactory.getBean(beanDefinitionName);
if(!(bean instanceof Advised)){
if(operateEventEnum == OperateEventEnum.ADD){
buildCandidateAdvised(beanFactory,advisor,bean,beanDefinitionName);
}
continue;
}
Advised advisedBean = (Advised) bean;
boolean isFindMatchAdvised = findMatchAdvised(advisedBean.getClass(),pointcut);
if(operateEventEnum == OperateEventEnum.DEL){
if(isFindMatchAdvised){
advisedBean.removeAdvice(advisor.getAdvice());
log.info("######################################### Remove Advice -->【{}】 For Bean -->【{}】 SUCCESS !",advisor.getAdvice().getClass().getName(),bean.getClass().getName());
}
}else if(operateEventEnum == OperateEventEnum.ADD){
if(isFindMatchAdvised){
advisedBean.addAdvice(advisor.getAdvice());
log.info("######################################### Add Advice -->【{}】 For Bean -->【{}】 SUCCESS !",advisor.getAdvice().getClass().getName(),bean.getClass().getName());
}
}
}
}
1、创建一个service
@Service
@Slf4j
public class HelloService implements BeanNameAware, BeanFactoryAware {
private BeanFactory beanFactory;
private String beanName;
@SneakyThrows
public String sayHello(String message) {
Object bean = beanFactory.getBean(beanName);
log.info("============================ {} is Advised : {}",bean, bean instanceof Advised);
TimeUnit.SECONDS.sleep(new Random().nextInt(3));
log.info("============================ hello:{}",message);
return "hello:" + message;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}
@Override
public void setBeanName(String name) {
this.beanName = name;
}
}
2、创建一个controller
@RestController
@RequestMapping("hello")
@RequiredArgsConstructor
public class HelloController {
private final HelloService helloService;
@GetMapping("{message}")
public String sayHello(@PathVariable("message")String message){
return helloService.sayHello(message);
}
}
3、准备一个日志切面jar
切面内容为
@Slf4j
public class LogMethodInterceptor implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
Object result;
try {
result = invocation.proceed();
} finally {
log.info(">>>>>>>>>>>>>>>>>>>>>>>>TargetClass:【{}】,method:【{}】,args:【{}】"
