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package cn.ishow.starter.rpc.aop;

import org.springframework.aop.ClassFilter;
import org.springframework.aop.MethodMatcher;
import org.springframework.aop.Pointcut;
import org.springframework.aop.support.AbstractBeanFactoryPointcutAdvisor;
import org.springframework.aop.support.StaticMethodMatcher;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.bind.annotation.RequestMapping;

import java.lang.reflect.Method;

/**
 * 自定义Advisor，让其能够动态链接Feign接口上面方法
 *
 * @author bucheng
 * @create 2022/5/15 11:29
 */
public class RpcClientAdvisor extends AbstractBeanFactoryPointcutAdvisor {

    /**
     * 对FeignClient注解类进行AOP拦截
     */
    private static final Pointcut FEIGN_POINTCUT = new RpcClientPointcut();

    @Override
    public Pointcut getPointcut() {
        return FEIGN_POINTCUT;
    }


    private static class RpcClientPointcut implements Pointcut {
        @Override
        public ClassFilter getClassFilter() {
            return clazz -> AnnotationUtils.findAnnotation(clazz, FeignClient.class) != null;

        }

        @Override
        public MethodMatcher getMethodMatcher() {
            return new StaticMethodMatcher() {
                @Override
                public boolean matches(Method method, Class targetClass) {
                    //这里包括GetMapping和PostMapping等;spring该方法会根据注解派生性进行获取
                    return AnnotationUtils.findAnnotation(method, RequestMapping.class) != null;
                }
            };
        }
    }
}