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

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# Spring Cloud Polaris CircuitBreaker Example
## Example Introduction
3 years ago
This example shows how to use```spring-cloud-starter-tencent-polaris-circuitbreaker``` in Spring Cloud project and other 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```.
## Instruction
### Configuration
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The configuration is as the following shows. ${ip} and ${port} are Polaris backend IP address and port number.
```yaml
spring:
application:
name: ${application.name}
cloud:
polaris:
3 years ago
address: ${ip}:${port}
```
###Launching Example
###Launching Polaris Backend Service
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Reference to [Polaris Getting Started](https://github.com/PolarisMesh/polaris#getting-started)
####Launching Application
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```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.
Two Services B's ```com.tencent.cloud.polaris.circuitbreaker.example.ServiceBController.info``` logics are different. One returns normally, one is abnormal.
- Maven Package Launching
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Execute under ```spring-cloud-tencent-examples/polaris-discovery-example```
note, Service B needs to launch two. One can adjust the port on the same machine.
Two Services B's com.tencent.cloud.polaris.circuitbreaker.example.ServiceBController.info logics are different. One returns normally, one is abnormal.
```sh
mvn clean package
```
Then under ``polaris-circuitbreaker-example-a``` and ``polaris-circuitbreaker-example-b``` find the package that generated jar, and run it
```
java -jar ${app.jar}
```
Launch application, change ${app.jar} to jar's package name
##Verify
####Feign Invoke
Execute the following orders to invoke Feign, the logic is ```ServiceB``` has an abnormal signal
```shell
curl -L -X GET 'localhost:48080/example/service/a/getBServiceInfo'
```
Expected return condition:
when appear
```
trigger the refuse for service b
```
it means the request signals abnormal ServiceB, and will ciruitbreak this instance, the later requests will return normally.