SpringCloud 聲明式采樣

2023-12-01 15:35 更新

一些應用程序需要根據(jù)java方法的類型或注釋進行采樣。

大多數(shù)用戶使用框架攔截器來自動化這種策略。以下示例顯示了它可能在內(nèi)部如何工作：

@Autowired Tracer tracer;

// derives a sample rate from an annotation on a java method
DeclarativeSampler<Traced> sampler = DeclarativeSampler.create(Traced::sampleRate);

@Around("@annotation(traced)")
public Object traceThing(ProceedingJoinPoint pjp, Traced traced) throws Throwable {
  // When there is no trace in progress, this decides using an annotation
  Sampler decideUsingAnnotation = declarativeSampler.toSampler(traced);
  Tracer tracer = tracer.withSampler(decideUsingAnnotation);

  // This code looks the same as if there was no declarative override
  ScopedSpan span = tracer.startScopedSpan(spanName(pjp));
  try {
    return pjp.proceed();
  } catch (RuntimeException | Error e) {
    span.error(e);
    throw e;
  } finally {
    span.finish();
  }
}


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