Documentation content changes: add circuitbreaker readme (#931)

CHANGELOG.md

@@ -8,3 +8,4 @@
 - [fix:optimize multi service registration and discovery.](https://github.com/Tencent/spring-cloud-tencent/pull/915)
 - [feature: improve circuit breaker usage.](https://github.com/Tencent/spring-cloud-tencent/pull/917)
 - [fix:fix nacos and consul registration.](https://github.com/Tencent/spring-cloud-tencent/pull/922)
+- [Documentation content changes: add circuitbreaker readme.](https://github.com/Tencent/spring-cloud-tencent/pull/931)

spring-cloud-tencent-examples/polaris-circuitbreaker-example/README-zh.md

@@ -1,27 +1,24 @@
-# Spring Cloud Polaris CircuitBreaker Example
+# Spring Cloud Polaris Circuitbreaker example
 
 ## 样例简介
 
 本样例将介绍如何在Spring Cloud项目中使用```spring-cloud-starter-tencent-polaris-circuitbreaker```以使用其各项功能。
 
-该样例分为两个微服务，即 
-
-1. ```polaris-circuitbreaker-example-a``` 
-2. ```polaris-circuitbreaker-example-b``` 有两个实例 B（默认正常服务）和 B2（模拟异常服务）
-
-``` polaris-circuitbreaker-example-a``` 对 ```polaris-circuitbreaker-example-b```发生调用。
+本样例包括被调方```polaris-circuitbreaker-callee-service```、```polaris-circuitbreaker-callee-service2```和主调方```polaris-circuitbreaker-feign-example```、```polaris-circuitbreaker-gateway-example```、```polaris-circuitbreaker-webclient-example```。
 
 ## 使用说明
 
 ### 修改配置
 
-修改 resource/bootstrap.yml 中北极星的服务端地址
+配置如下所示。其中，${ip}和${port}为Polaris后端服务的IP地址与端口号。
 
 ```yaml
 spring:
+  application:
+    name: ${application.name}
   cloud:
     polaris:
-       address: grpc://${ip}:8091
+      address: ${ip}:${port}
 ```
 
 ### 启动样例
@@ -30,43 +27,40 @@ spring:
 
 参考[Polaris Getting Started](https://github.com/PolarisMesh/polaris#getting-started)。
 
-### 启动应用
+#### 启动被调应用
 
-- IDEA启动
+分别启动```polaris-circuitbreaker-example/polaris-circuitbreaker-callee-service```、```polaris-circuitbreaker-example/polaris-circuitbreaker-callee-service2```
 
-分别启动
 
-1. ```spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a```下的```ServiceA```
-2. ```spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b```下的```ServiceB```
-3. ```spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2```下的```ServiceB2```
+#### 启动主调应用
 
+##### 启动Feign并验证
 
-## 验证
+启动```polaris-circuitbreaker-example/polaris-circuitbreaker-feign-example```。
 
-### Feign调用
+发送请求`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromPolaris'`, 验证熔断和Polaris-server远程拉取降级。
 
-执行以下命令发起Feign调用，其逻辑为```ServiceB```抛出一个异常
+发送请求`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromCode'`, 验证熔断和代码降级。
 
-```shell
-curl -L -X GET 'localhost:48080/example/service/a/getBServiceInfo'
-```
+##### 启动RestTemplate并验证
 
-预期返回情况：
+启动```polaris-circuitbreaker-example/polaris-circuitbreaker-resttemplate-example```。
 
-在出现
-```
-hello world ! I'm a service B1
-```            
+发送请求`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromPolaris'`, 验证熔断和Polaris-server远程拉取降级。
+
+发送请求`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromCode'`, 验证熔断和代码降级。
+
+##### 启动WebClient并验证
+
+启动```polaris-circuitbreaker-example/polaris-circuitbreaker-webclient-example```。
+
+发送请求`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo'`, 验证熔断和代码降级。
 
-时，表示 B2 已经被熔断了，请求只会打到 B1。
+##### 启动SCG并验证
 
-### 验证更多场景
+启动```polaris-circuitbreaker-example/polaris-circuitbreaker-gateway-example```。
 
-您也可以调整 ```example-b``` 和 ```example-b2``` 中 ```resource/bootstrap.yml``` is-throw-runtime-exception
-参数调整服务是否抛出异常。
+发送请求`curl --location --request GET 'http://127.0.0.1:48080/polaris-circuitbreaker-callee-service/example/service/b/info'`, 验证熔断和代码降级。
 
-例如测试以下场景：
-1. 两个实例都是正常的，这时候预期是 B1 和 B2 都能正常被调用到
-2. 一个实例正常一个实例不正常，这时候预期是不正常实例被熔断，请求只会打到正常的实例
-3. 两个实例都不正常，这时候 Feign 会自动 Fallback 到 ProviderBFallback.java 的实现类
+修改```polaris-circuitbreaker-example/polaris-circuitbreaker-gateway-example/resources/bootstrap.yml```。删除本地fallback方法并重启，验证熔断和Polaris-server远程拉取降级。
 

spring-cloud-tencent-examples/polaris-circuitbreaker-example/README.md

@@ -1,10 +1,10 @@
-# Spring Cloud Polaris CircuitBreaker Example
+# Spring Cloud Polaris Circuitbreaker example
 
 ## Example Introduction
 
-This example shows how to use```spring-cloud-starter-tencent-polaris-circuitbreaker``` in Spring Cloud project and other features
+This example shows how to use```spring-cloud-starter-tencent-polaris-circuitbreaker```in Spring Cloud project for its features.
 
-This example is divided to two microservice, ```polaris-circuitbreaker-example-a``` and ```polaris-circuitbreaker-example-b```. In these two microservices, ```polaris-circuitbreaker-example-a``` invokes ```polaris-circuitbreaker-example-b```.
+This example contains callee-service```polaris-circuitbreaker-callee-service```、```polaris-circuitbreaker-callee-service2```and caller-service```polaris-circuitbreaker-feign-example```、```polaris-circuitbreaker-gateway-example```、```polaris-circuitbreaker-webclient-example```.
 
 ## Instruction
 
@@ -23,56 +23,44 @@ spring:
 
 ### Launching Example
 
-###Launching Polaris Backend Service
+#### Launching Polaris Backend Service
 
 Reference to [Polaris Getting Started](https://github.com/PolarisMesh/polaris#getting-started)
 
-####Launching Application
+#### Launching callee service
 
-Note, because verification is needed for circuit-break feature, therefore, one needs to deploy more than two invoked services (two deployment in this example)
+Launching```polaris-circuitbreaker-example/polaris-circuitbreaker-callee-service```、```polaris-circuitbreaker-example/polaris-circuitbreaker-callee-service2```
 
-Launching```spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a```'s ServiceA and ```spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b```'s ServiceB
 
-note, Service B needs to launch two. One can adjust the port on the same machine.
+#### Launching caller service
 
-Two Services B's ```com.tencent.cloud.polaris.circuitbreaker.example.ServiceBController.info``` logics are different. One returns normally, one is abnormal.
+##### Launching Feign and Verify
 
-- Maven Package Launching
+Launching```polaris-circuitbreaker-example/polaris-circuitbreaker-feign-example```.
 
-Execute under ```spring-cloud-tencent-examples/polaris-discovery-example```
+Sending request`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromPolaris'`, Verify circuit breaker and fallback from Polaris-server.
 
-note, Service B needs to launch two. One can adjust the port on the same machine.
+Sending request`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromCode'`, Verify circuit breaker and fallback from code.
 
-Two Services B's com.tencent.cloud.polaris.circuitbreaker.example.ServiceBController.info logics are different. One returns normally, one is abnormal.
+##### Launching RestTemplate and Verify
 
-```sh
-mvn clean package
-```
+Launching```polaris-circuitbreaker-example/polaris-circuitbreaker-resttemplate-example```.
 
-Then under ``polaris-circuitbreaker-example-a``` and ``polaris-circuitbreaker-example-b``` find the package that generated jar, and run it
+Sending request`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromPolaris'`, Verify circuit breaker and fallback from Polaris-server.
 
-```
-java -jar ${app.jar}
-```
+Sending request`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo/fallbackFromCode'`, Verify circuit breaker and fallback from code.
 
-Launch application, change ${app.jar} to jar's package name
+##### Launching WebClient and Verify
 
-##Verify
+Launching```polaris-circuitbreaker-example/polaris-circuitbreaker-webclient-example```。
 
-####Feign Invoke
+Sending request`curl --location --request GET 'http://127.0.0.1:48080/example/service/a/getBServiceInfo'`, Verify circuit breaker and fallback from code.
 
-Execute the following orders to invoke Feign, the logic is ```ServiceB``` has an abnormal signal
+##### Launching SCG and Verify
 
-```shell
-curl -L -X GET 'localhost:48080/example/service/a/getBServiceInfo'
-```
+Launching```polaris-circuitbreaker-example/polaris-circuitbreaker-gateway-example```。
 
-Expected return condition:
+Sending request`curl --location --request GET 'http://127.0.0.1:48080/polaris-circuitbreaker-callee-service/example/service/b/info'`, Verify circuit breaker and fallback from code.
 
-when appear
-
-```
-trigger the refuse for service b
-```
+Changing```polaris-circuitbreaker-example/polaris-circuitbreaker-gateway-example/resources/bootstrap.yml```, delete local fallback and restart, Verify circuit breaker and fallback from Polaris-server.
 
-it means the request signals abnormal ServiceB, and will ciruitbreak this instance, the later requests will return normally. 

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-gateway-example/src/main/resources/bootstrap.yml

@@ -35,8 +35,8 @@ spring:
           'filters[1]':
             name: CircuitBreaker
             args:
-              # statusCodes 缺省时会自动识别 "4**,5**" 为错误
-#              statusCodes: '''4**,502'''
+              # statusCodes 缺省时会自动识别 "5**" 为错误
+#              statusCodes: '''404,5**'''
               # fallbackUri 缺省时会在熔断触发后拉取 plaris server 配置的降级作为 response
               fallbackUri: '''forward:/polaris-fallback'''
 #      routes: