Enum MetricValueProvider 

#[non_exhaustive]
pub enum MetricValueProvider {
    Measurable(Box<dyn Measurable>),
    Gauge(Box<dyn Gauge>),
}

Super-interface for Measurable or Gauge that provides metric values.

Java’s MetricValueProvider<T> is generic over the produced value type (Double for Measurable, T for Gauge<T>). Because the public crate::common::Metric::metric_value returns an erased value, we model the provider as an enum over the two concrete kinds rather than a generic trait; the produced value is the type-erased MetricValue.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Measurable(Box<dyn Measurable>)

A measurable quantity (produces an f64).

Gauge(Box<dyn Gauge>)

A gauge (produces an arbitrary instantaneous value).

Implementations

impl MetricValueProvider

pub fn value(&self, config: &MetricConfig, now: i64) -> MetricValue

Returns the current value associated with this metric.

• config - The configuration for this metric
• now - The POSIX time in milliseconds the measurement is being taken