metriki-core 1.8.0

A metrics library ported from dropwizard metrics
Documentation 
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use std::sync::atomic::{AtomicI64, Ordering};

#[cfg(feature = "ser")]
use serde::ser::SerializeMap;
#[cfg(feature = "ser")]
use serde::{Serialize, Serializer};

/// Counters are integer values you can increment and decrement.
#[derive(Debug)]
pub struct Counter {
    value: AtomicI64,
}

impl Counter {
    pub(crate) fn new() -> Counter {
        Counter {
            value: AtomicI64::new(0),
        }
    }

    pub fn inc(&self, n: i64) {
        self.value.fetch_add(n, Ordering::Relaxed);
    }

    pub fn dec(&self, n: i64) {
        self.value.fetch_sub(n, Ordering::Relaxed);
    }

    pub fn value(&self) -> i64 {
        self.value.load(Ordering::Relaxed)
    }
}

#[cfg(feature = "ser")]
impl Serialize for Counter {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut map = serializer.serialize_map(Some(1))?;
        map.serialize_entry("value", &self.value())?;
        map.end()
    }
}