* Allow negative paramIndex in ParamFlowRule

Signed-off-by: Carpenter Lee <hooleeucas@163.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

* Add a ApiCommandHandler which fetch all registered CommandHandlers so that user can get all available CommandHandlers by request /api
* Add a customized CommandHandler demo

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

* Extract getRule in BlockException and refine override methods in subclasses

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Apply awaitility to core tests
- Cache maven local repo in Travis

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

* Polish #272: upgrade nacos-client version and create a new constructor for NacosDataSource to support namespace, endpoint, ak, sk and so on
* check properties in NacosDataSource

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- The constructor now accept `sampleCount` and `windowIntervalMs` so that it can match the two basic properties

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add several command handlers
- Update cluster state manager

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add exception item extracting method in ParamFlowRule

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Update ParamFlowRule to support cluster mode
- Add `ParamFlowClusterConfig` to provide cluster mode items for the rule
- Update ParamFlowChecker to support cluster flow mode
- Extract ParamFlowRuleUtil class
- Change type of `flowId` from Integer to Long

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Update ParamFlowRule to support cluster mode
- Add `ParamFlowClusterConfig` to provide cluster mode items for the rule
- Update ParamFlowChecker to support cluster flow mode
- Extract ParamFlowRuleUtil class
- Change type of `flowId` from Integer to Long

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- To enable parameter flow control in Sentinel annotation support

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Refactor the slot interface to support prioritized entry
- Add `entryWithPriority` in SphU

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Rename AbstractSentinelAspect to AbstractSentinelAspectSupport

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Enhance resolve name logic in MethodUtil
- Add test case for MethodUtil

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

update nacos version to 0.2.1.  change default port. 8080 -> 8848. fix port conflict.

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- 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.

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- This implementation uses Lettuce as the internal client, and leverages Redis pub-sub feature to implement push mode data source. (by @tigerMoon)

- Some refinement for file data source
- Add resource name checking in FlowRuleManager to avoid NPE

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add method to check if the resource is modified in `AutoRefreshDataSource`
- Implement FileWritableDataSource