高可用服务熔断降级代码示例

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高可用服务熔断降级代码示例

产品类型降级处理

package com.youfan.hystrix;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.youfan.model.ProductType;
import com.youfan.service.ProductTypeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2018/6/18 0018.
 */
@Service
public class ProductTypeServicehy {

    @Autowired
    ProductTypeService productTypeService ;

    @HystrixCommand(fallbackMethod = "listproductTypeFallback")
    public List<ProductType> listproductType(){
        return productTypeService.listproductType();
    }

    public List<ProductType> listproductTypeFallback(){
        ProductType productType = new ProductType();
        productType.setId(1);
        productType.setParentid(-1);
        productType.setProducttypedescription("吃的");
        productType.setProducttypename("食品18");
        productType.setTypegrade("1");
        List<ProductType> list = new ArrayList<ProductType>();
        list.add(productType);
        return list;
    }

}

说明：

1）当listproductType访问失败后，会访问降级处理listproductTypeFallback；

产品首页显示产品信息

    @Autowired
    ProductTypeServicehy productTypeServicehy;

    @RequestMapping(value = "/indexproduct",method = RequestMethod.GET)
    public String sayHi(Model model , @RequestParam int productytpeid){
        List<ProductType> list = productTypeServicehy.listproductType();
        model.addAttribute("productypelist",list);
        System.out.println(list);
        if(productytpeid == -1){
            productytpeid = list.get(0).getId();
        }
        List<Product> productlist = productService.listproduct(productytpeid);
        model.addAttribute("produclist",productlist);
        return "list";
    }