ClearRules clears all the rules in flow module.

ClearRulesOfResource clears resource level rules in flow module.

GetRules returns all the rules based on copy.

GetRulesOfResource returns specific resource's rules based on copy.

IsValidRule 校验给定的规则是否何方.

LoadRules loads the given flow rules to the rule manager, while all previous rules will be replaced.

LoadRulesOfResource loads the given resource's flow rules to the rule manager, while all previous resource's rules will be replaced.

NewClusterMetric 新建集群Metric.

NewClusterMetricWithCheck 新建集群Metric.

NewRequestLimiter 构造请求Limiter.

SetTrafficShapingGenerator sets the traffic controller generator for the given TokenCalculateStrategy and ControlBehavior.

AssociatedResource 表示由关联资源而不是当前资源进行流量控制。.

CurrentResource 表示直接通过当前资源进行流量控制。.

Throttling 表示挂起的请求将被限制，在队列中等待（直到有可用容量）.

DefaultDowngradeIntervalInNs 默认降级2s.

ClusterConfig 集群流控配置.

ClusterMetric 集群Metric.

DefaultClusterTokenClient 默认TokenClient.

DefaultTokenService 默认TokenService集群实现.

MemoryAdaptiveTrafficShapingCalculator is a memory adaptive traffic shaping calculator adaptive flow control algorithm If the watermark is less than Rule.MemLowWaterMarkBytes, the threshold is Rule.LowMemUsageThreshold.

Rule 描述流控策略，流控策略基于QPS统计指标.

ThrottlingChecker limits the time interval between two requests.

TrafficShapingCalculator calculates the actual traffic shaping threshold based on the threshold of rule and the traffic shaping strategy.

TrafficShapingChecker performs checking according to current metrics and the traffic shaping strategy, then yield the token result.

ClusterStrategy 集群策略.

ControlBehavior 定义请求达到资源容量时的行为。.

RelationStrategy 表示基于调用关系的流控策略。.

ResourceClusterMap 资源->clusterMetric Map.

TokenServerStrategy TokenServer策略.

TrafficControllerGenFunc represents the TrafficShapingController generator function of a specific control behavior.

TrafficControllerIdMap key为ruleId，value为Metric.

TrafficControllerMap represents the map storage for TrafficShapingController.