ggq 0.1.1

A simulation framework for multi-server queues.
Documentation 
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use std::cmp::Ordering;
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering as AtomicOrdering;

#[derive(Clone, Copy, Debug)]
pub struct Customer {
    id: usize,
    pub arrival_time: f64,
    pub service_time: f64,
    service_start: Option<f64>,
    service_end: Option<f64>,
}

impl std::fmt::Display for Customer {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "Customer({}, {:.4}, {:.4})",
            self.id, self.arrival_time, self.service_time
        )
    }
}

impl Customer {
    pub fn new(arrival_time: f64, service_time: f64) -> Self {
        static COUNTER: AtomicUsize = AtomicUsize::new(1);
        let id = COUNTER.fetch_add(1, AtomicOrdering::Relaxed);

        Self {
            id,
            arrival_time,
            service_time,
            service_start: None,
            service_end: None,
        }
    }

    pub fn waiting_time(&self) -> Option<f64> {
        match self.service_start {
            Some(service_start) => Some(service_start - self.arrival_time),
            _ => None,
        }
    }

    pub fn cycle_time(&self) -> Option<f64> {
        match self.service_end {
            Some(service_end) => Some(service_end - self.arrival_time),
            _ => None,
        }
    }

    pub fn set_service_start(&mut self, service_start: f64) {
        self.service_start = Some(service_start);
    }

    pub fn set_service_end(&mut self, service_end: f64) {
        self.service_end = Some(service_end);
    }
}

impl Ord for Customer {
    fn cmp(&self, other: &Self) -> Ordering {
        self.arrival_time.partial_cmp(&other.arrival_time).unwrap()
    }
}

impl PartialOrd for Customer {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        self.arrival_time.partial_cmp(&other.arrival_time)
    }
}

impl Eq for Customer {}

impl PartialEq for Customer {
    fn eq(&self, other: &Self) -> bool {
        self.arrival_time == other.arrival_time
    }
}