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use crate::metrics::{self, Meter, MeterProvider};
use core::fmt;
use once_cell::sync::Lazy;
use std::sync::{Arc, RwLock};
static GLOBAL_METER_PROVIDER: Lazy<RwLock<GlobalMeterProvider>> = Lazy::new(|| {
RwLock::new(GlobalMeterProvider::new(
metrics::noop::NoopMeterProvider::new(),
))
});
#[derive(Clone)]
pub struct GlobalMeterProvider {
provider: Arc<dyn MeterProvider + Send + Sync>,
}
impl fmt::Debug for GlobalMeterProvider {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("GlobalMeterProvider").finish()
}
}
impl MeterProvider for GlobalMeterProvider {
fn versioned_meter(
&self,
name: &'static str,
version: Option<&'static str>,
schema_url: Option<&'static str>,
) -> Meter {
self.provider.versioned_meter(name, version, schema_url)
}
}
impl GlobalMeterProvider {
pub fn new<P>(provider: P) -> Self
where
P: MeterProvider + Send + Sync + 'static,
{
GlobalMeterProvider {
provider: Arc::new(provider),
}
}
}
pub fn set_meter_provider<P>(new_provider: P)
where
P: metrics::MeterProvider + Send + Sync + 'static,
{
let mut global_provider = GLOBAL_METER_PROVIDER
.write()
.expect("GLOBAL_METER_PROVIDER RwLock poisoned");
*global_provider = GlobalMeterProvider::new(new_provider);
}
pub fn meter_provider() -> GlobalMeterProvider {
GLOBAL_METER_PROVIDER
.read()
.expect("GLOBAL_METER_PROVIDER RwLock poisoned")
.clone()
}
pub fn meter(name: &'static str) -> Meter {
meter_provider().versioned_meter(name, None, None)
}
pub fn meter_with_version(
name: &'static str,
version: Option<&'static str>,
schema_url: Option<&'static str>,
) -> Meter {
meter_provider().versioned_meter(name, version, schema_url)
}