Spring Boot中自定义注解+AOP实现主备库切换

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface SwitchDataBase {
    boolean switch2Backup() default false;
}

import java.lang.reflect.Method;
import java.util.Arrays;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
/**
 * 处理走备库逻辑的注解
 */
@Component
public class SwitchDataBaseInterceptor implements MethodInterceptor {
    private final Logger log = LoggerFactory.getLogger(SwitchDataBaseInterceptor.class);
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        Method method = invocation.getMethod();
        SwitchDataBase annotation = getAnnotation(method);
        if (annotation == null) {
            return invocation.proceed();
        }
        Object val = null;
        if(!ThreadLocalMap.containsKey(GroupDataSourceRouteHelper.DATASOURCE_INDEX)) {
            if (annotation.switch2Backup()) {
                log.info("query back up DB, method: " + method.getName());
                GroupDataSourceRouteHelper.executeByGroupDataSourceIndex(1, true);
            } else {
                log.info("query primary DB, method: " + method.getName());
                GroupDataSourceRouteHelper.executeByGroupDataSourceIndex(0, true);
            }
        }
        try {
            val = invocation.proceed();
        } catch (Exception e) {
            log.info(method.getDeclaringClass().getName() + "." +
                    invocation.getMethod().getName() + "方法调用失败，arguments：" +
                    Arrays.toString(invocation.getArguments()));
            throw new RuntimeException(e);
        } finally {
            GroupDataSourceRouteHelper.removeGroupDataSourceIndex();
        }
        return val;
    }
    /**
     * 找方法上面声明的注解
     */
    private SwitchDataBase getAnnotation(Method method) {
        if (method.isAnnotationPresent(SwitchDataBase.class)) {
            return method.getAnnotation(SwitchDataBase.class);
        }
        return null;
    }
}

package com.wdk.wms.configuration;
import com.wdk.wms.annotation.SwitchDataBaseInterceptor;
import org.springframework.aop.Advisor;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.aop.support.JdkRegexpMethodPointcut;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class SwitchDataBaseConfiguration {
    @Bean(name = "overallQueryInterceptor")
    public SwitchDataBaseInterceptor overallQueryInterceptor() {
        return new SwitchDataBaseInterceptor();
    }
    //添加aop的pointcut
    @Bean(name = "jdkRegexpMethodPointcut")
    public JdkRegexpMethodPointcut jdkRegexpMethodPointcut() {
        JdkRegexpMethodPointcut jdkRegexpMethodPointcut = new JdkRegexpMethodPointcut();
        jdkRegexpMethodPointcut.setPatterns("com.wdk.wms.mapper.*");
        return jdkRegexpMethodPointcut;
    }
    //设置默认的aop配置对应的是原来的<aop:advisor>
    @Bean
    public Advisor druidAdvisor() {
        DefaultPointcutAdvisor defaultPointcutAdvisor = new DefaultPointcutAdvisor();
        defaultPointcutAdvisor.setPointcut(jdkRegexpMethodPointcut());
        defaultPointcutAdvisor.setAdvice(overallQueryInterceptor());
        return defaultPointcutAdvisor;
    }
}

@SwitchDataBase(switch2Backup = true)
List<ConsumerNoticeMsg> listByTemplateOver3(@Param("templates") List<Integer> templates);