Spring Boot Actuator：如何在自定義 HealthIndicator 中獲取指標正常運行時間？

Question

我想做一個取決於應用程序正常運行時間的自定義 HealthIndicator。

@Component
public class HealthActuator implements HealthIndicator {

    private final MetricsEndpoint metricsEndpoint;

    @Autowired
    public HealthActuator(MetricsEndpoint metricsEndpoint) {
        this.metricsEndpoint = metricsEndpoint;
    }

    @Override
    public Health health() {
        long uptime = (Long) metricsEndpoint.invoke().get("uptime");
        // logic with uptime
        return Health.up().build();
    }

}

但是有一個錯誤： a circular dependency between 2 beans in the application context 。

我可以通過對端點 /actuator/health 的休息調用來獲得正常運行時間指標。

但也許有可能以編程方式做到這一點？

PS 日志堆棧跟蹤：

11-01 14:34:09 WARN org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'healthActuator' defined in file [/Users/serge/projects/bb/bb-imapl/target/classes/bb/imapl/config/HealthActuator.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration$$EnhancerBySpringCGLIB$$2bb06d4a]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'healthActuator': Requested bean is currently in creation: Is there an unresolvable circular reference?
11-01 14:34:09 WARN org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'healthActuator' defined in file [/Users/serge/projects/bb/bb-imapl/target/classes/bb/imapl/config/HealthActuator.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration$$EnhancerBySpringCGLIB$$2bb06d4a]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'healthActuator': Requested bean is currently in creation: Is there an unresolvable circular reference?
11-01 14:34:09 ERROR org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter - 

***************************
APPLICATION FAILED TO START
***************************

Description:

There is a circular dependency between 2 beans in the application context:
    - healthActuator defined in file [/Users/serge/projects/bb/bb-imapl/target/classes/bb/imapl/config/HealthActuator.class]
    - org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration
    - healthActuator


11-01 14:34:09 ERROR org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter - 

Answer 1

如果您不喜歡 setter 注入，也應該可以使用@Lazy解決此@Lazy ...

@Autowired
public HealthActuator(@Lazy MetricsEndpoint metricsEndpoint) {
    this.metricsEndpoint = metricsEndpoint;
}

Answer 2

EndpointAutoConfiguration依賴於HealthIndicator （您使用HealthActuator實現）。

所以你最終會得到一個循環依賴。 當 2 個 bean 需要彼此實例化自己時（通過構造函數注入），就會發生這種情況。 您可以使用 setter 注入來打破循環：

@Component
public class HealthActuator implements HealthIndicator {
    private MetricsEndpoint metricsEndpoint;

    @Autowired
    private void setMetricsEndpoint(MetricsEndpoint metricsEndpoint) {
        this.metricsEndpoint = metricsEndpoint;
    }

    public HealthActuator() {
    }

    @Override
    public Health health() {
        long uptime = (Long) metricsEndpoint.invoke().get("uptime");
        // logic with uptime
        return Health.up().build();
    }
}