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0.9.0.RELEASE版本的spring cloud alibaba sentinel限流、降级处理实例

作者:互联网

  先看服务提供方的,我们在原来的sentinel实例(参见0.9.0.RELEASE版本的spring cloud alibaba sentinel实例)上加上限流、降级处理,三板斧只需在最后那一斧controller类中做如下修改:

    @Slf4j
    @RestController
    static class TestController {

        @Autowired
        private TestService testService;

        @GetMapping("/hello")
        public String hello() {
            return testService.hello();
        }

        @GetMapping("/hey")
        public String hey() throws InterruptedException {return testService.hey();
        }

    }

  再新增一个service类,我们把@SentinelResource挪到这里,并在注解里指定限流、降级的方法:

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

@Slf4j
@Service
public class TestService {

    @SentinelResource(value = "hello", blockHandler = "helloBlock")
    public String hello() {
        return "hello";
    }

    public String helloBlock(BlockException ex) {
        return "hello block";
    }

    @SentinelResource(value = "hey", fallback = "heyFallback")
    public String hey() throws InterruptedException {
     Thread.sleep(2000); return "hey"; } public String heyFallback() { return "hey fallback"; } }

  注意限流、降级方法(helloBlock、heyFallback)都需要与原方法参数、返回类型保持一致(限流参数多一个BlockException)。降级的超时是看@SentinelResource所在方法的,所以睡两秒的逻辑也跟着这个注解走,从之前的controller挪到service来。限流、降级规则和jmeter都同之前配置,我们再用jmeter测试下:

 

 

 

标签:0.9,return,String,spring,hey,public,限流,hello
来源: https://www.cnblogs.com/wuxun1997/p/11395263.html