# Spring Cloud Polaris Discovery example
## Example Introduction
This example shows how to use ```spring-cloud-starter-tencent-polaris-discovery`` in Spring Cloud project for its features.
This example is divided to two microservice, discovery-caller-service and discovery-callee-service. In these two microservices, discovery-caller-service invokes discovery-callee-service.
## Instruction
### Configuration
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:
address: ${ip}:${port}
```
### Launching Example
#### Launching Polaris Backend Service
Reference to [Polaris Getting Started ](https://github.com/PolarisMesh/polaris#getting-started )
#### Launching Application
- IDEA Launching
Launching ```spring-cloud-tencent-examples/polaris-discovery-example/discovery-caller-service```'s ```DiscoveryCallerService``` and ```spring-cloud-tencent-examples/polaris-discovery-example/discovery-callee-service```'s ```DiscoveryCalleeService```
- Maven Package Launching
Execute under ```spring-cloud-tencent-examples/polaris-discovery-example```
```sh
mvn clean package
```
Then at ```discovery-caller-service``` and ```discovery-callee-service``` find the package that generates 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, ```DiscoveryCalleeService``` goes bank to the sum of value1+value2
```shell
curl -L -X GET 'http://localhost:48080/discovery/service/caller/feign?value1=1& value2=2'
```
Expected return rate
```
3
```
#### RestTemplate Invoke
Execute the following orders to invoke RestTemplate, ```DiscoveryCalleeService``` goes back to string characters
```shell
curl -L -X GET 'http://localhost:48080/discovery/service/caller/rest'
```
Expected return rate
```
Discovery Service Callee
```
