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use crate::export::metrics::aggregation::{
Aggregation, AggregationKind, Buckets, Count, Histogram, Max, Min, Sum,
};
use crate::metrics::{
aggregators::Aggregator,
sdk_api::{AtomicNumber, Descriptor, Number, NumberKind},
};
use opentelemetry_api::metrics::{MetricsError, Result};
use opentelemetry_api::Context;
use std::mem;
use std::sync::{Arc, RwLock};
pub fn histogram(boundaries: &[f64]) -> HistogramAggregator {
let mut sorted_boundaries = boundaries.to_owned();
sorted_boundaries.sort_by(|a, b| a.partial_cmp(b).unwrap());
let state = State::empty(&sorted_boundaries);
HistogramAggregator {
inner: RwLock::new(Inner {
boundaries: sorted_boundaries,
state,
}),
}
}
#[derive(Debug)]
pub struct HistogramAggregator {
inner: RwLock<Inner>,
}
#[derive(Debug)]
struct Inner {
boundaries: Vec<f64>,
state: State,
}
#[derive(Debug)]
struct State {
bucket_counts: Vec<f64>,
count: AtomicNumber,
sum: AtomicNumber,
min: AtomicNumber,
max: AtomicNumber,
}
impl State {
fn empty(boundaries: &[f64]) -> Self {
State {
bucket_counts: vec![0.0; boundaries.len() + 1],
count: NumberKind::U64.zero().to_atomic(),
sum: NumberKind::U64.zero().to_atomic(),
min: NumberKind::I64.max().to_atomic(), max: NumberKind::U64.min().to_atomic(),
}
}
}
impl Sum for HistogramAggregator {
fn sum(&self) -> Result<Number> {
self.inner
.read()
.map_err(From::from)
.map(|inner| inner.state.sum.load())
}
}
impl Min for HistogramAggregator {
fn min(&self) -> Result<Number> {
self.inner
.read()
.map_err(From::from)
.map(|inner| inner.state.min.load())
}
}
impl Max for HistogramAggregator {
fn max(&self) -> Result<Number> {
self.inner
.read()
.map_err(From::from)
.map(|inner| inner.state.max.load())
}
}
impl Count for HistogramAggregator {
fn count(&self) -> Result<u64> {
self.inner
.read()
.map_err(From::from)
.map(|inner| inner.state.count.load().to_u64(&NumberKind::U64))
}
}
impl Histogram for HistogramAggregator {
fn histogram(&self) -> Result<Buckets> {
self.inner
.read()
.map_err(From::from)
.map(|inner| Buckets::new(inner.boundaries.clone(), inner.state.bucket_counts.clone()))
}
}
impl Aggregation for HistogramAggregator {
fn kind(&self) -> &AggregationKind {
&AggregationKind::HISTOGRAM
}
}
impl Aggregator for HistogramAggregator {
fn aggregation(&self) -> &dyn Aggregation {
self
}
fn update(&self, _cx: &Context, number: &Number, descriptor: &Descriptor) -> Result<()> {
self.inner.write().map_err(From::from).map(|mut inner| {
let kind = descriptor.number_kind();
let as_float = number.to_f64(kind);
let mut bucket_id = inner.boundaries.len();
for (idx, boundary) in inner.boundaries.iter().enumerate() {
if as_float < *boundary {
bucket_id = idx;
break;
}
}
inner.state.count.fetch_add(&NumberKind::U64, &1u64.into());
inner.state.sum.fetch_add(kind, number);
inner.state.min.fetch_set_min(kind, number);
inner.state.max.fetch_set_max(kind, number);
inner.state.bucket_counts[bucket_id] += 1.0;
})
}
fn synchronized_move(
&self,
other: &Arc<dyn Aggregator + Send + Sync>,
_descriptor: &Descriptor,
) -> Result<()> {
if let Some(other) = other.as_any().downcast_ref::<Self>() {
self.inner
.write()
.map_err(From::from)
.and_then(|mut inner| {
other.inner.write().map_err(From::from).map(|mut other| {
let empty = State::empty(&inner.boundaries);
other.state = mem::replace(&mut inner.state, empty)
})
})
} else {
Err(MetricsError::InconsistentAggregator(format!(
"Expected {:?}, got: {:?}",
self, other
)))
}
}
fn merge(&self, other: &(dyn Aggregator + Send + Sync), desc: &Descriptor) -> Result<()> {
if let Some(other) = other.as_any().downcast_ref::<HistogramAggregator>() {
self.inner
.write()
.map_err(From::from)
.and_then(|mut inner| {
other.inner.read().map_err(From::from).map(|other| {
inner
.state
.sum
.fetch_add(desc.number_kind(), &other.state.sum.load());
inner
.state
.count
.fetch_add(&NumberKind::U64, &other.state.count.load());
inner
.state
.min
.fetch_set_min(desc.number_kind(), &other.state.min.load());
inner
.state
.max
.fetch_set_min(desc.number_kind(), &other.state.max.load());
for idx in 0..inner.state.bucket_counts.len() {
inner.state.bucket_counts[idx] += other.state.bucket_counts[idx];
}
})
})
} else {
Err(MetricsError::InconsistentAggregator(format!(
"Expected {:?}, got: {:?}",
self, other
)))
}
}
fn as_any(&self) -> &dyn std::any::Any {
self
}
}