Principle of sentinel integrating Nacos to update data dynamically

1） Dynamic data source top-level interface

1. loadConfig Method ： Return target data , It should be sentinel Various rule objects needed ;
2. readSource Method ： Return source data , It is usually a string type or byte type , Then it is parsed into the target data type above , It can be inferred that this method is the focus of implementation ;
3. getProperty Method ： Get the binding with the current data source SentinelProperty, It can be seen that it is related to the target data ;
4. summary ： The whole process is 2->1->3 The order of

2） Top level abstract class
Contains a data converter , Convert source data to target data , and SentinelProperty Implementation class of DynamicSentinelProperty

3）Nacos data source 、 Rewrite the readSource Method 、 Initialization data

1. according to nacos Configuration center API Return source data ;
2. call getProperty().updateValue(newValue) Update data ;

4）SentinelProperty Top level interface

1. updateValue The method is the point , Will be notified one by one PropertyListener Update data , call PropertyListener Of configLoad Method ;
2. addListener Called when PropertyListener Of configUpdate Method ;

5） On flow control rules FlowPropertyListener
6）sentinel Flow control processor FlowSlot

1. Will eventually call FlowRuleManager Of getRules Method to obtain flow control rules ,FlowRuleManager Inner class FlowPropertyListener It is PropertyListener Implementation class of interface , This connects the whole process