Resilience4J Ratelimiter 不限制注解方法的訪問

Question

I am using the resilience4j-spring-boot2 library ( io.github.resilience4j:resilience4j-spring-boot2 , version 1.5.0 ) and Spring Boot version 2.3.1.RELEASE . 我創建了一個RateLimiter ，它應該只讓一個線程每 30 秒執行一次某個方法。 但是，線程調用該方法似乎沒有界限（除了在 Tomcat 服務器中運行的已配置線程數）。

我實現了一個簡單的服務，它等待給定的時間然后返回“Hello:”：

@RequestMapping("/")
@RestController
public class ResilientService {

    @RateLimiter(name = "hello-rl")
    @GetMapping("/hello/{timeout}")
    public String hello(@PathVariable int timeout) throws InterruptedException {
        Thread.sleep(timeout);
        return "Hello!";
    }

}

並配置 Ratelimiter 如下

resilience4j.ratelimiter:
  instances:
    hello-rl:
      limitForPeriod: 1  # The number of permissions available during one limit refresh period
      limitRefreshPeriod: 30s  # The period of a limit refresh. After each period the rate limiter sets its permissions count back to the limitForPeriod value
      timeoutDuration: 30s  # The default wait time a thread waits for a permission

我用八個線程調用了該服務：

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@RunWith(SpringRunner.class)
@Slf4j
public class CircuitBreakerTest {

    @Autowired
    TestRestTemplate testRestTemplate;

    @LocalServerPort
    private int port;

    @Value("${server.address}")
    private String serverAddress;

    @Test
    public void t() throws InterruptedException {
        final ExecutorService executorService = Executors.newFixedThreadPool(8);

        for (int i : IntStream.rangeClosed(1, 8).toArray()) {
            executorService.execute(() -> log.error(callService()));
        }

        executorService.shutdown();
        executorService.awaitTermination(1, TimeUnit.MINUTES);
    }

    private String callService() {
        return testRestTemplate.getForObject(
                "http://" + serverAddress + ":" + port + "/hello/5000",
                String.class
        );
    }

output如下：

2020-08-07 10:41:10,095 ERROR [pool-1-thread-7] CircuitBreakerTest: Hello!
2020-08-07 10:41:10,095 ERROR [pool-1-thread-1] CircuitBreakerTest: Hello!
2020-08-07 10:41:10,095 ERROR [pool-1-thread-8] CircuitBreakerTest: Hello!
2020-08-07 10:41:10,095 ERROR [pool-1-thread-2] CircuitBreakerTest: Hello!
2020-08-07 10:41:10,095 ERROR [pool-1-thread-5] CircuitBreakerTest: Hello!
2020-08-07 10:41:15,104 ERROR [pool-1-thread-3] CircuitBreakerTest: Hello!
2020-08-07 10:41:15,121 ERROR [pool-1-thread-4] CircuitBreakerTest: Hello!
2020-08-07 10:41:15,121 ERROR [pool-1-thread-6] CircuitBreakerTest: Hello!

一次似乎只允許五個線程執行該方法，但我不知道為什么。 Tomcat 服務器以 >8 個線程運行。 我犯錯了嗎？ 還是我誤解了 RateLimiter 應該如何工作？

Answer 1

resilience4j-spring-boot2內部使用方面，因此需要將spring-boot-starter-aop依賴添加到項目中才能使注釋工作：

        <dependency>
            <!-- for rate limiting -->
            <groupId>io.github.resilience4j</groupId>
            <artifactId>resilience4j-spring-boot2</artifactId>
            <version>${resilience4j.version}</version>
        </dependency>
        <dependency>
            <!-- needed for Resilience4j -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

正如一開始的官方文檔中所述（“設置”）......完全錯過了這一點。