sentinel 之 SentinelRestTemplate

SentinelRestTemplate用于 sentinel 集成 RestTemplate
添加在 RestTemplate 主键上，全局的限流容错处理，优先级低于局部限流容错注解 @SentinelResource

例如：

package com.example;

import com.alibaba.cloud.sentinel.annotation.SentinelRestTemplate;
import com.example.exception.ExceptionUtil;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class OrderServiceRestApplication {

    @Bean
    @LoadBalanced
    @SentinelRestTemplate(blockHandler = "handleException", blockHandlerClass = ExceptionUtil.class,
            fallback = "fallback", fallbackClass = ExceptionUtil.class)
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(OrderServiceRestApplication.class, args);
    }

}

blockHandler 　　　限流策略 　（方法名，方法必须是静态的）
blockHandlerClass 限流方法类
fallback　　　　　　熔断降级策略（方法名，方法必须是静态的）
fallbackClass 　　 熔断降级类
例如：

package com.example.exception;

import com.alibaba.cloud.sentinel.rest.SentinelClientHttpResponse;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.fastjson.JSON;
import com.example.pojo.Product;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpResponse;

public class ExceptionUtil {

    // 服务流量控制处理
    public static ClientHttpResponse handleException(HttpRequest request,
                                                     byte[] body,
                                                     ClientHttpRequestExecution execution,
                                                     BlockException exception) {
        exception.printStackTrace();
        return new SentinelClientHttpResponse(
                JSON.toJSONString(new Product(1, "服务流量控制处理-托底数据", 2, 2666D)));
    }

    // 服务熔断降级处理
    public static ClientHttpResponse fallback(HttpRequest request,
                                                    byte[] body,
                                                    ClientHttpRequestExecution execution,
                                                    BlockException exception) {
        exception.printStackTrace();
        return new SentinelClientHttpResponse(
                JSON.toJSONString(new Product(1, "服务熔断降级处理-托底数据", 2, 2666D)));
    }

}