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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
use crate::ErrorType;
use crate::Rate;
// When changing this trait, ensure all operations are implemented in the
// related type in `../metrics`. (Except test_get_num_errors)
/// A description for the `NumeratorMetric` subtype of the [`RateMetric`](crate::metrics::RateMetric) type.
pub trait Numerator {
/// Increases the numerator by `amount`.
///
/// # Arguments
///
/// * `amount` - The amount to increase by. Should be non-negative.
///
/// ## Notes
///
/// Logs an error if the `amount` is negative.
fn add_to_numerator(&self, amount: i32);
/// **Exported for test purposes.**
///
/// Gets the currently stored value as a pair of integers.
///
/// # Arguments
///
/// * `ping_name` - the optional name of the ping to retrieve the metric
/// for. Defaults to the first value in `send_in_pings`.
///
/// This doesn't clear the stored value.
fn test_get_value<'a, S: Into<Option<&'a str>>>(&self, ping_name: S) -> Option<Rate>;
/// **Exported for test purposes.**
///
/// Gets the number of recorded errors for the given metric and error type.
///
/// # Arguments
///
/// * `error` - The type of error
///
/// # Returns
///
/// The number of errors reported.
fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32;
}