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这篇文章主要讲解了“Sentinel限流的使用方法”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“Sentinel限流的使用方法”吧!
前言: Sentinel 是由alibaba出品的,针对于系统负载保护的组件,其有丰富的流量防护手段和多样化的流量整型策略而被广大使用。 以下是转自Sentinel官方的介绍: 随着微服务的流行,服务和服务之间的稳定性变得越来越重要。Sentinel 是面向分布式服务架构的轻量级流量控制组件,主要以流量为切入点,从限流、流量整形、熔断降级、系统负载保护等多个维度来帮助您保障微服务的稳定性。 Sentinel-wiki Sentinel GitHub wiki 有兴趣的童鞋可以去了解。
引入sentinel-core
<dependency> <groupId>com.alibaba.csp</groupId> <artifactId>sentinel-core</artifactId> <version>1.6.3</version> </dependency>
加载规则信息
private static final String RESOURCE_NAME = "hello"; /** * 加载限流规则 */ public static void loadRules(){ List<FlowRule> rules = new ArrayList<FlowRule>(); FlowRule flowRule = new FlowRule(); flowRule.setResource(RESOURCE_NAME); //资源名 flowRule.setLimitApp("default");//default 代表对所有应用生效 flowRule.setGrade(RuleConstant.FLOW_GRADE_QPS); //限流阈值类型 flowRule.setCount(10); //阈值 rules.add(flowRule); FlowRuleManager.loadRules(rules); }
添加资源入口处理限流异常
/** * 执行方法 * @param hello */ public static void hello(String hello){ Entry entry = null; try { entry = SphU.entry(RESOURCE_NAME); log.info("args hello value is {}",hello); }catch (Exception e){ if(FlowException.isBlockException(e)){ log.error("block resourceName: {}",RESOURCE_NAME); } }finally { if(entry !=null){ entry.exit(); } } }
模拟调用测试
public static void main(String[] args) { loadRules(); for(int i=0;i<20;i++){ hello("hello"+i); } }
运行记录
15:26:08.453 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello0 15:26:08.458 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello1 15:26:08.458 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello2 15:26:08.458 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello3 15:26:08.459 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello4 15:26:08.459 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello5 15:26:08.459 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello6 15:26:08.459 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello7 15:26:08.459 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello8 15:26:08.459 [main] INFO com.example.sentinel.sentineldemo.SampleFlowDemo - args hello value is hello9 15:26:08.492 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.492 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.493 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello 15:26:08.494 [main] ERROR com.example.sentinel.sentineldemo.SampleFlowDemo - block resourceName: hello
感谢各位的阅读,以上就是“Sentinel限流的使用方法”的内容了,经过本文的学习后,相信大家对Sentinel限流的使用方法这一问题有了更深刻的体会,具体使用情况还需要大家实践验证。这里是亿速云,小编将为大家推送更多相关知识点的文章,欢迎关注!
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