Merge pull request #2404 from DanielLiu1123/upgrade_sentinel_1.8.3

Upgrade Sentinel to 1.8.3.

spring-cloud-alibaba-dependencies/pom.xml

@@ -19,7 +19,7 @@
 
     <properties>
         <revision>2022.0-SNAPSHOT</revision>
-        <sentinel.version>1.8.1</sentinel.version>
+        <sentinel.version>1.8.3</sentinel.version>
         <seata.version>1.3.0</seata.version>
         <nacos.client.version>1.4.3</nacos.client.version>
         <nacos.config.version>0.8.0</nacos.config.version>

spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example/pom.xml

@@ -18,10 +18,6 @@
 
 
     <dependencies>
-        <dependency>
-            <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-starter-bootstrap</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>

spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example/readme-zh.md

@@ -56,8 +56,8 @@ feign:
 再访问 http://localhost/test/default/true 断路器处于打开状态
 
 验证指定 feign client 生效  
-先访问 http://localhost/test/feign/true 2 次  
+先访问 http://localhost/test/feign/false 2 次  
-再访问 http://localhost/test/feign/false 断路器处于打开状态
+再访问 http://localhost/test/feign/true 断路器处于打开状态
 
 验证 feign client 指定方法生效  
 先访问 http://localhost/test/feignMethod/false 2次  

spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example/readme.md

@@ -0,0 +1,68 @@
+# Sentinel Feign Circuit Breaker Example
+
+## Project description
+
+OpenFeign integrates Sentinel circuit breaker implementation
+
+## sample
+
+1. add dependency
+
+```xml
+<!-- requires spring cloud 2020.0.4 and above -->
+<dependency>
+    <groupId>org.springframework.cloud</groupId>
+    <artifactId>spring-cloud-starter-openfeign</artifactId>
+</dependency>
+```
+2. add configuration to config center
+	
+```yaml
+feign:
+  circuitbreaker:
+    enabled: true # Enable feign circuit breaker support
+  sentinel:
+    default-rule: default # Default rule name
+    rules:
+      # Default rule, valid for all feign clients
+      default:
+        - grade: 2 # Downgrade based on number of exceptions
+          count: 1
+          timeWindow: 15 # Time to half-open state after downgrade
+          statIntervalMs: 1000
+          minRequestAmount: 1
+      # Only valid for feign client user
+      user:
+        - grade: 2
+          count: 1
+          timeWindow: 15
+          statIntervalMs: 1000
+          minRequestAmount: 1
+      # Only valid for the method feignMethod of the feign client user
+      # Parentheses are parameter types, separated by multiple commas, such as user#method(boolean,String,Map)
+      "[user#feignMethod(boolean)]":
+        - grade: 2
+          count: 1
+          timeWindow: 10
+          statIntervalMs: 1000
+          minRequestAmount: 1
+```
+
+## Verify
+Startup project
+
+Verify that the default feign client takes effect. 
+First visit http:localhost/test/default/false 2 times 
+and then visit http:localhost/test/default/true, the circuit breaker is open
+
+Verify that the specified feign client takes effect.
+First visit http:localhost/test/feign/false 2 times
+and then visit http:localhost/test/feign/true, the circuit breaker is open
+
+Verify that the specified method of feign client takes effect.
+First visit http://localhost/test/feignMethod/false 2 times
+and then visit http://localhost/test/feignMethod/true, the circuit breaker is open
+
+## Rules are dynamically refreshed
+Modify the rules of the configuration center, and then access the above interface
+

spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example/src/main/resources/application.yml

@@ -7,5 +7,5 @@ spring:
     nacos:
       config:
         server-addr: 127.0.0.1:8848
-        name: sentinel-circuitbreaker-rules.yml
+  config:
-        file-extension: yml
+    import: optional:nacos:sentinel-circuitbreaker-rules.yml