#scheduler #job

clokwerk

A simple Rust recurring task scheduler, similar to Python’s schedule

1 unstable release

0.1.0 Sep 7, 2018

#90 in Date and time

Download history 8/week @ 2018-09-07

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Apache-2.0

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Clokwerk, a simple scheduler

Clokwerk is a simple scheduler, inspired by Python's Schedule and Ruby's clockwork. It uses a similar DSL for scheduling, rather than parsing cron strings.

Usage

// Scheduler, and trait for .seconds(), .minutes(), etc.
use clokwerk::{Scheduler, TimeUnit};
// Import week days and WeekDay
use clokwerk::Interval::*;
use std::thread;
use std::time::Duration;

// Create a new scheduler
let mut scheduler = Scheduler::new();
// Add some tasks to it
scheduler.every(10.minutes()).plus(30.seconds()).run(|| println!("Periodic task"));
scheduler.every(1.day()).at("3:20 pm").run(|| println!("Daily task"));
scheduler.every(Wednesday).at("14:20:17").run(|| println!("Weekly task"));
scheduler.every(Weekday).run(|| println!("Every weekday at midnight"));

// Manually run the scheduler in an event loop
for _ in 1..10 {
    scheduler.run_pending();
    thread::sleep(Duration::from_secs(10));
}

// Or run it in a background thread
let thread_handle = scheduler.watch_thread(Duration::from_millis(100));
// The scheduler stops when `thread_handle` is dropped, or `stop` is called
thread_handle.stop();

Caveats

Some combinations of times or intervals are permissible, but make little sense, e.g. every(10.seconds()).at("16:00"), which would next run at the next 4 PM after the next multiple of 10 seconds.

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Dependencies

~754KB
~10K SLoC