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use core::time;
use std::sync::{Arc, Mutex};
use std::time::{SystemTime, UNIX_EPOCH};
use std::fmt;
use std::thread;
#[derive(Clone, Debug)]
pub struct Sarmio {
time: Arc<Mutex<u64>>,
machine_id: u64,
sequence: u64,
}
#[derive(Clone, Debug)]
pub struct ID {
pub id: u64,
pub machine_id: u64,
pub time: u64,
}
impl Iterator for Sarmio {
type Item = u64;
fn next(&mut self) -> Option<u64> {
Option::from(self.next_id())
}
}
impl Sarmio {
pub fn new(machine_id: u64) -> Sarmio {
Sarmio {
time: Arc::new(Mutex::new(0)),
machine_id: machine_id,
sequence: 0,
}
}
pub fn next_id(&mut self) -> Option<u64> {
let mut current_time = self.time.lock().unwrap();
let mut timestamp = self.get_time();
if timestamp < *current_time {
if *current_time - timestamp > 150 {
return None;
} else {
self.sleep((*current_time - timestamp) + 1);
timestamp = self.get_time();
}
} else if timestamp == *current_time {
self.sequence = (self.sequence + 1) & self.machine_id
} else {
self.sequence = 0;
}
*current_time = timestamp;
Option::from((timestamp << 24) | self.sequence << 16 | self.machine_id)
}
fn sleep(&self, milis: u64) {
thread::sleep(time::Duration::from_millis(milis));
}
pub fn machine_id(&mut self, id: u64) {
self.machine_id = id;
}
pub fn get_machine_id(&self) -> u64 {
self.machine_id
}
fn get_time(&self) -> u64 {
match SystemTime::now().duration_since(UNIX_EPOCH) {
Ok(t) => t.as_secs(),
Err(_) => panic!("system time before unix epoch"),
}
}
}
impl fmt::Display for ID {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"id: {}\ntime: {}\nmachine_id: {}",
self.id, self.time, self.machine_id
)
}
}
pub fn decompose(id: u64) -> ID {
let mask_machine_id = (1 << 16) - 1;
ID {
id: id,
time: (id >> 24) as u64,
machine_id: id & mask_machine_id,
}
}
impl ID {
pub fn older(&self, other: &ID) -> bool {
self.time < other.time
}
pub fn same_machine(&self, other: &ID) -> bool {
self.machine_id == other.machine_id
}
}