Sentinel热门词汇限流的实现详解

<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-parameter-flow-control</artifactId>
    <version>x.y.z</version>
</dependency>

@RequestMapping("/getUserOrder")
public String getUserOrder(Long userId) {
    Entry entry = null;
    try {
        entry = SphU.entry(getUserOrder, EntryType.IN, 1, userId);
        return "根据userId获取用户订单信息成功";
    } catch (Exception e) {
        return "您操作的比较频繁，请稍后重试!";
    } finally {
        if (entry != null) {
            entry.exit();
        }
    }
}
// 定义热点限流的规则，对第一个参数设置 qps 限流模式，阈值为1
ParamFlowRule rule = new ParamFlowRule(getUserOrder)
        .setParamIdx(0)
        .setGrade(RuleConstant.FLOW_GRADE_QPS)
        .setCount(1);
ParamFlowRuleManager.loadRules(Collections.singletonList(rule));

@RequestMapping("/getUserOrder")
@SentinelResource(value = "getUserOrder")
public String getUserOrder(Long userId) {
    return "根据userId获取用户订单信息成功";
}