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use std::ops::BitOr;
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, PartialOrd, Ord)]
pub enum MetricKind {
Counter,
Gauge,
Histogram,
}
#[derive(Debug, Eq, PartialEq, Hash, Clone, Copy, Ord, PartialOrd)]
pub struct MetricKindMask(u8);
impl MetricKindMask {
pub const NONE: MetricKindMask = MetricKindMask(0);
pub const COUNTER: MetricKindMask = MetricKindMask(1);
pub const GAUGE: MetricKindMask = MetricKindMask(2);
pub const HISTOGRAM: MetricKindMask = MetricKindMask(4);
pub const ALL: MetricKindMask = MetricKindMask(7);
#[inline]
fn value(&self) -> u8 {
self.0
}
pub fn matches(&self, kind: MetricKind) -> bool {
match kind {
MetricKind::Counter => self.0 & MetricKindMask::COUNTER.value() != 0,
MetricKind::Gauge => self.0 & MetricKindMask::GAUGE.value() != 0,
MetricKind::Histogram => self.0 & MetricKindMask::HISTOGRAM.value() != 0,
}
}
}
impl BitOr for MetricKindMask {
type Output = Self;
fn bitor(self, rhs: Self) -> Self::Output {
Self(self.0 | rhs.0)
}
}
#[cfg(test)]
mod tests {
use super::MetricKindMask;
use crate::MetricKind;
#[test]
fn test_matching() {
let cmask = MetricKindMask::COUNTER;
let gmask = MetricKindMask::GAUGE;
let hmask = MetricKindMask::HISTOGRAM;
let nmask = MetricKindMask::NONE;
let amask = MetricKindMask::ALL;
assert!(cmask.matches(MetricKind::Counter));
assert!(!cmask.matches(MetricKind::Gauge));
assert!(!cmask.matches(MetricKind::Histogram));
assert!(!gmask.matches(MetricKind::Counter));
assert!(gmask.matches(MetricKind::Gauge));
assert!(!gmask.matches(MetricKind::Histogram));
assert!(!hmask.matches(MetricKind::Counter));
assert!(!hmask.matches(MetricKind::Gauge));
assert!(hmask.matches(MetricKind::Histogram));
assert!(amask.matches(MetricKind::Counter));
assert!(amask.matches(MetricKind::Gauge));
assert!(amask.matches(MetricKind::Histogram));
assert!(!nmask.matches(MetricKind::Counter));
assert!(!nmask.matches(MetricKind::Gauge));
assert!(!nmask.matches(MetricKind::Histogram));
}
}