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// Copyright 2023 The RocketMQ Rust Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/// No-op long counter used when metrics are disabled.
#[derive(Debug, Default, Clone, Copy)]
pub struct NopLongCounter;
impl NopLongCounter {
/// Creates a new no-op long counter.
#[inline]
pub fn new() -> Self {
Self
}
/// Adds a value to the counter.
#[inline]
pub fn add(&self, _value: i64) {}
}
/// No-op long histogram used when metrics are disabled.
#[derive(Debug, Default, Clone, Copy)]
pub struct NopLongHistogram;
impl NopLongHistogram {
/// Creates a new no-op long histogram.
#[inline]
pub fn new() -> Self {
Self
}
/// Records a value in the histogram.
#[inline]
pub fn record(&self, _value: i64) {}
}
/// No-op observable long gauge used when metrics are disabled.
#[derive(Debug, Default, Clone, Copy)]
pub struct NopObservableLongGauge;
impl NopObservableLongGauge {
/// Creates a new no-op observable long gauge.
#[inline]
pub fn new() -> Self {
Self
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn nop_counter_accepts_values() {
let counter = NopLongCounter::new();
counter.add(100);
}
#[test]
fn nop_histogram_accepts_values() {
let histogram = NopLongHistogram::new();
histogram.record(100);
}
#[test]
fn nop_gauge_is_copyable() {
let gauge = NopObservableLongGauge::new();
let copied = gauge;
let _ = copied;
}
}