1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering;
use std::sync::Arc;
use std::default::Default;
use std::thread;
use std::time::Duration;
use Interval;
use Job;

/// Job scheduler
#[derive(Debug)]
pub struct Scheduler {
    jobs: Vec<Job>,
}

impl Default for Scheduler {
    fn default() -> Self {
        Scheduler { jobs: vec![] }
    }
}

impl Scheduler {
    /// Create a new scheduler.
    pub fn new() -> Self {
        Scheduler::default()
    }
    /// Add a new job to the scheduler to be run on the given interval
    /// ```rust
    /// # extern crate clokwerk;
    /// # use clokwerk::*;
    /// # use clokwerk::Interval::*;
    /// let mut scheduler = Scheduler::new();
    /// 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"));
    /// ```
    pub fn every(&mut self, ival: Interval) -> &mut Job {
        let job = Job::new(ival);
        self.jobs.push(job);
        let last_index = self.jobs.len() - 1;
        &mut self.jobs[last_index]
    }

    /// Run all jobs that should run at this time.
    /// ```rust
    /// # extern crate clokwerk;
    /// # use clokwerk::*;
    /// # use clokwerk::Interval::*;
    /// use std::thread;
    /// use std::time::Duration;
    /// # let mut scheduler = Scheduler::new();
    /// loop {
    ///     scheduler.run_pending();
    ///     thread::sleep(Duration::from_millis(100));
    ///     # break
    /// }
    /// ```
    pub fn run_pending(&mut self) {
        for job in &mut self.jobs {
            if job.is_pending() {
                job.execute();
            }
        }
    }

    /// Start a background thread to call [Scheduler::run_pending()] with the specified frequency.
    /// The resulting thread fill end cleanly if the returned [ScheduleHandle] is dropped.
    pub fn watch_thread(self, frequency: Duration) -> ScheduleHandle {
        let stop = Arc::new(AtomicBool::new(false));
        let my_stop = stop.clone();
        let mut me = self;
        let handle = thread::spawn(move || {
            while !stop.load(Ordering::SeqCst) {
                me.run_pending();
                thread::sleep(frequency);
            }
        });
        ScheduleHandle {
            stop: my_stop,
            thread_handle: Some(handle),
        }
    }
}

/// Guard object for the scheduler background thread. The thread is terminated if this object
/// is dropped, or [ScheduleHandle::stop()] is called
pub struct ScheduleHandle {
    stop: Arc<AtomicBool>,
    thread_handle: Option<thread::JoinHandle<()>>,
}
impl ScheduleHandle {
    /// Halt the scheduler background thread
    pub fn stop(self) {}
}

impl Drop for ScheduleHandle {
    fn drop(&mut self) {
        self.stop.store(true, Ordering::SeqCst);
        let handle = self.thread_handle.take();
        handle.unwrap().join().ok();
    }
}

#[cfg(test)]
mod tests {
    // use super::Scheduler;
    // use *;
    // use std::thread;
    // use std::time::Duration;

    // // #[test]
    // fn test_something() {
    //     let mut scheduler = Scheduler::new();
    //     scheduler
    //         .every(10.minutes())
    //         .plus(5.seconds())
    //         .run(|| println!("I'm running!"));
    //     scheduler
    //         .every(3.days())
    //         .at("15:23")
    //         .run(|| println!("I'm running!"));
    //     println!("{:?}", scheduler);
    //     scheduler.run_pending();
    //     println!("{:?}", scheduler);

    //     assert!(false);
    // }

    // #[test]
    // fn test_something_else() {
    //     let mut scheduler = Scheduler::new();
    //     scheduler.every(5.seconds()).and_every(2.seconds()).run(|| println!("Running!"));
    //     let handle = scheduler.watch_thread(Duration::from_millis(100));
    //     thread::sleep(Duration::from_secs(7));
    //     handle.stop();
    //     thread::sleep(Duration::from_secs(7));
    // }
}