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use std::collections::VecDeque;
use time;
#[derive(Debug, Default)]
pub struct AverageSpeedMeter {
inspect_items: usize,
inspected_items: VecDeque<f64>,
speed: f64,
last_timestamp: Option<f64>,
}
impl AverageSpeedMeter {
pub fn with_inspect_items(inspect_items: usize) -> Self {
assert!(inspect_items > 0);
AverageSpeedMeter {
inspect_items: inspect_items,
inspected_items: VecDeque::with_capacity(inspect_items),
speed: 0_f64,
last_timestamp: None,
}
}
pub fn speed(&self) -> f64 {
let items_per_second = 1_f64 / self.speed;
if items_per_second.is_normal() { items_per_second } else { 0_f64 }
}
pub fn inspected_items_len(&self) -> usize {
self.inspected_items.len()
}
pub fn checkpoint(&mut self) {
if self.inspected_items.len() == self.inspect_items {
let oldest = self.inspected_items.pop_front().expect("len() is not zero; qed");
self.speed = (self.inspect_items as f64 * self.speed - oldest) / (self.inspect_items as f64 - 1_f64);
}
let now = time::precise_time_s();
if let Some(last_timestamp) = self.last_timestamp {
let newest = now - last_timestamp;
self.speed = (self.inspected_items.len() as f64 * self.speed + newest) / (self.inspected_items.len() as f64 + 1_f64);
self.inspected_items.push_back(newest);
}
self.last_timestamp = Some(now);
}
pub fn start(&mut self) {
self.last_timestamp = Some(time::precise_time_s());
}
pub fn stop(&mut self) {
self.last_timestamp = None;
}
}