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.
```rust // 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.runpending(); thread::sleep(Duration::fromsecs(10)); }
// Or run it in a background thread
let threadhandle = scheduler.watchthread(Duration::frommillis(100));
// The scheduler stops when thread_handle is dropped, or stop is called
threadhandle.stop();
```
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.
cron syntax for scheduling.