Eric Zhao 88a02623ac Add flow control by frequent (hot spot) parameters (#156) ... - Add callback registry for statistic slot for extensions. - Add a new module `sentinel-parameter-flow-control` under `sentinel-extension`. - Add a `CacheMap` interface to provide abstraction for cache. We use ConcurrentLinkedHashMap as the default implementation (LRU strategy).. - Add a `ParameterMetric` class as frequent parameter metrics for a specific resource. The metric map is located in `ParamFlowSlot` rather than `ClusterNode`. - Implement `ParameterLeapArray` as statistic data structure for frequent parameters in a period of time window. - Add `ParamFlowSlot` as the checker slot; Add `ParamFlowChecker` to do rule checking; Add `ParamFlowRuleManager` to do rule managing. - The statistic metrics for frequent parameters is enabled only if the related resource has configured parameter flow rule; Parameter metrics for removed rules will be cleared automatically. - Leverage extensible `SlotChainBuilder` to provide a `HotParamSlotChainBuilder`. - Add command handlers for hot param rules. - Add test cases and demo.		2018-09-27 14:15:47 +08:00
..
src	Add flow control by frequent (hot spot) parameters (#156)	2018-09-27 14:15:47 +08:00
pom.xml	jialianglinjl	2018-08-29 15:33:33 +08:00