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use crate::metrics::{AtomicNumber, Descriptor, MetricsError, Number, NumberKind, Result};
use crate::sdk::export::metrics::{Aggregator, Count, Max, Min, MinMaxSumCount, Sum};
use std::any::Any;
use std::cmp::Ordering;
use std::sync::{Arc, Mutex};
pub fn min_max_sum_count(descriptor: &Descriptor) -> MinMaxSumCountAggregator {
let kind = descriptor.number_kind().clone();
MinMaxSumCountAggregator {
inner: Mutex::new(Inner { state: None }),
kind,
}
}
#[derive(Debug)]
struct Inner {
state: Option<State>,
}
#[derive(Debug)]
pub struct MinMaxSumCountAggregator {
inner: Mutex<Inner>,
kind: NumberKind,
}
impl Min for MinMaxSumCountAggregator {
fn min(&self) -> Result<Number> {
self.inner.lock().map_err(From::from).map(|inner| {
inner
.state
.as_ref()
.map_or(0u64.into(), |state| state.min.load())
})
}
}
impl Max for MinMaxSumCountAggregator {
fn max(&self) -> Result<Number> {
self.inner.lock().map_err(From::from).map(|inner| {
inner
.state
.as_ref()
.map_or(0u64.into(), |state| state.max.load())
})
}
}
impl Sum for MinMaxSumCountAggregator {
fn sum(&self) -> Result<Number> {
self.inner.lock().map_err(From::from).map(|inner| {
inner
.state
.as_ref()
.map_or(0u64.into(), |state| state.sum.load())
})
}
}
impl Count for MinMaxSumCountAggregator {
fn count(&self) -> Result<u64> {
self.inner
.lock()
.map_err(From::from)
.map(|inner| inner.state.as_ref().map_or(0u64, |state| state.count))
}
}
impl MinMaxSumCount for MinMaxSumCountAggregator {}
impl Aggregator for MinMaxSumCountAggregator {
fn update(&self, number: &Number, descriptor: &Descriptor) -> Result<()> {
self.inner
.lock()
.map(|mut inner| {
if let Some(state) = &mut inner.state {
let kind = descriptor.number_kind();
state.count = state.count.saturating_add(1);
state.sum.fetch_add(kind, number);
if number.partial_cmp(kind, &state.min.load()) == Some(Ordering::Less) {
state.min = number.to_atomic();
}
if number.partial_cmp(kind, &state.max.load()) == Some(Ordering::Greater) {
state.max = number.to_atomic();
}
} else {
inner.state = Some(State {
count: 1,
sum: number.to_atomic(),
min: number.to_atomic(),
max: number.to_atomic(),
})
}
})
.map_err(From::from)
}
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.lock().map_err(From::from).and_then(|mut inner| {
other.inner.lock().map_err(From::from).map(|mut oi| {
oi.state = inner.state.take();
})
})
} else {
Err(MetricsError::InconsistentAggregator(format!(
"Expected {:?}, got: {:?}",
self, other
)))
}
}
fn merge(&self, aggregator: &(dyn Aggregator + Send + Sync), desc: &Descriptor) -> Result<()> {
if let Some(other) = aggregator.as_any().downcast_ref::<Self>() {
self.inner.lock().map_err(From::from).and_then(|mut inner| {
other.inner.lock().map_err(From::from).map(|oi| {
match (inner.state.as_mut(), oi.state.as_ref()) {
(None, Some(other_checkpoint)) => {
inner.state = Some(other_checkpoint.clone());
}
(Some(_), None) | (None, None) => (),
(Some(state), Some(other)) => {
state.count = state.count.saturating_add(other.count);
state.sum.fetch_add(desc.number_kind(), &other.sum.load());
let other_min = other.min.load();
let other_max = other.max.load();
if state.min.load().partial_cmp(desc.number_kind(), &other_min)
== Some(Ordering::Greater)
{
state.min.store(&other_min);
}
if state.max.load().partial_cmp(desc.number_kind(), &other_max)
== Some(Ordering::Less)
{
state.max.store(&other_max);
}
}
}
})
})
} else {
Err(MetricsError::InconsistentAggregator(format!(
"Expected {:?}, got: {:?}",
self, aggregator
)))
}
}
fn as_any(&self) -> &dyn Any {
self
}
}
#[derive(Clone, Debug)]
struct State {
count: u64,
sum: AtomicNumber,
min: AtomicNumber,
max: AtomicNumber,
}