Spring Boot - Rate Limiting with Resilience4j

  <!--  resilience4j ratelimit  -->
  <properties>
    <spring-cloud.version>2020.0.4</spring-cloud.version>
  </properties>
  <dependencies>
    <!--  spring cloud circuit breaker  -->
    <dependency>
      <groupId>io.github.resilience4j</groupId>
      <artifactId>resilience4j-spring-boot2</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>
  </dependencies>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${spring-cloud.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

resilience4j.ratelimiter:
  instances:
    serviceA_greet:
      limitForPeriod: 5
      limitRefreshPeriod: 1s
      timeoutDuration: 0

@RestController
public class Controller {

  @GetMapping("/greet/{id}")
  @RateLimiter(name = "serviceA_greet", fallbackMethod = "greetFallBack")
  public ResponseEntity greet(@PathVariable(name = "id") int id) {
    log.info("ServiceA.greet");
    Greeting greeting = new Greeting(id, "Hello ServiceA");

    return ResponseEntity.ok()
        .body(GsonUtils.toJson(greeting));
  }

  public ResponseEntity greetFallBack(int id, Throwable t) {
    log.error("Rate limit applied");
    return ResponseEntity
        .status(HttpStatus.TOO_MANY_REQUESTS)
        .build();
  }

}