Spring Cloud Polaris RateLimit Example

Project Explanation

This project shows how to use ratelimit feature of Polaris to complete Spring Cloud application's rate limit

Before showcasing the project, let's get to know how to access Polaris rate limit component

** note: this chapter is to help you understand different ways to access, the codes in the example has been executed, you don't need to re-edit.**

1, first, change document pom.xml, introduce Polaris ratelimit starter

<dependency>
    <groupId>com.tencent.cloud</groupId>
    <artifactId>spring-cloud-starter-tencent-polaris-ratelimit</artifactId>
</dependency>

Examples provided by Polaris all support to run at IDE, or compile and run with orders

Launch Polaris locally
at Polaris end, through control panel, under namespace Product, add RateLimitCalleeService
Launch callee server:
1. Launch IDE directly: First find RateLimitCalleeService, execute main then launch application
2. compile package then launch: first execute mvn clean package compile the package, then execute java -jar ratelimit-callee-sevice-${verion}.jar execute the application
- After launching, one can watch server instance from Polaris control panel
1. Invoke Service
After visiting http://127.0.0.1:48081/business/invoke, one can see the following information:
```
hello world for ratelimit service 1
hello world for ratelimit service 2
hello world for ratelimit service 3
...
```

Configuration rate limit and verification Polaris provide three wats to conduct rate limit configuration (control panel, HTTP port and local files)

this example is HTTP configuration. One can figure with the following steps:

 curl -X POST -H "Content-Type:application/json" 127.0.0.1:8090/naming/v1/ratelimits  -d @rule.json

Verify rate limit result continue visit http://127.0.0.1:48081/business/invoke, one can see, after 10 invokes, rate limit will start:

 hello world for ratelimit service 1
 hello world for ratelimit service 2