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extern crate time;
mod alloc_wheel;
mod copy_wheel;
pub use alloc_wheel::AllocWheel;
pub use copy_wheel::CopyWheel;
use std::hash::Hash;
use std::fmt::Debug;
use time::Duration;
#[derive(Debug, Eq, PartialEq, Ord, PartialOrd)]
pub enum Resolution {
Ms,
TenMs,
HundredMs,
Sec,
Min,
Hour
}
pub trait Wheel<T: Eq + Hash + Debug + Clone> {
fn start(&mut self, key: T, time: Duration);
fn stop(&mut self, key: T);
fn expire(&mut self) -> Vec<T>;
}
#[derive(Debug, Clone)]
struct Slot<T: Debug + Clone> {
pub entries: Vec<T>
}
impl<T: Debug + Clone> Slot<T> {
pub fn new() -> Slot<T> {
Slot {
entries: Vec::new()
}
}
}
struct InnerWheel<T: Debug + Clone> {
pub slots: Vec<Slot<T>>
}
impl<T: Debug + Clone> InnerWheel<T> {
pub fn new(size: usize) -> InnerWheel<T> {
InnerWheel {
slots: vec![Slot::new(); size]
}
}
}
#[doc(hidden)]
pub fn wheel_sizes(resolutions: &mut Vec<Resolution>) -> Vec<usize> {
assert!(resolutions.len() > 0);
resolutions.sort();
resolutions.dedup();
let end = resolutions.len() - 1;
let mut sizes = Vec::with_capacity(resolutions.len());
for i in 0..resolutions.len() {
let wheel_size = match resolutions[i] {
Resolution::Ms => {
if i == end {
1000
} else {
match resolutions[i+1] {
Resolution::TenMs => 10,
Resolution::HundredMs => 100,
_ => 1000
}
}
},
Resolution::TenMs => {
if i == end {
100
} else {
match resolutions[i+1] {
Resolution::HundredMs => 10,
_ => 100
}
}
},
Resolution::HundredMs => 10,
Resolution::Sec => 60,
Resolution::Min => 60,
Resolution::Hour => 24
};
sizes.push(wheel_size);
}
sizes
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn resolutions_sorted_and_deduped() {
let mut resolutions = vec![Resolution::Sec, Resolution::Min, Resolution::TenMs, Resolution::Min];
let _ = wheel_sizes(&mut resolutions);
assert_eq!(vec![Resolution::TenMs, Resolution::Sec, Resolution::Min], resolutions);
}
#[test]
fn wheel_sizes_correct() {
let mut resolutions = vec![
vec![Resolution::Ms, Resolution::TenMs, Resolution::Sec],
vec![Resolution::Ms, Resolution::HundredMs, Resolution::Sec, Resolution::Min],
vec![Resolution::Ms, Resolution::Sec],
vec![Resolution::TenMs, Resolution::HundredMs, Resolution::Sec]
];
let expected = vec![
vec![10, 100, 60],
vec![100, 10, 60, 60],
vec![1000, 60],
vec![10, 10, 60]
];
for (mut r, expected) in resolutions.iter_mut().zip(expected) {
assert_eq!(expected, wheel_sizes(&mut r));
}
}
}