runwhen/src/timer.rs

// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
use std::thread;
use std::time::Duration;

use traits::Process;
use error::CommandError;
use exec::run_cmd;

pub struct TimerProcess<'a> {
    cmd: &'a str,
    poll_duration: Duration,
    max_repeat: Option<u32>
}

impl<'a> TimerProcess<'a> {
    pub fn new(cmd: &'a str, poll_duration: Duration, max_repeat: Option<u32>) -> TimerProcess<'a> {
        TimerProcess{cmd: cmd, poll_duration: poll_duration, max_repeat: max_repeat}
    }
}

impl<'a> Process for TimerProcess<'a> {
    fn run(&self) -> Result<(), CommandError> {
        let mut counter = 0;
        loop {
            if self.max_repeat.is_some() && counter >= self.max_repeat.unwrap() {
                return Ok(());
            }
            if let Err(err) = run_cmd(self.cmd) {
                println!("{:?}", err)
            }
            thread::sleep(self.poll_duration);
            if self.max_repeat.is_some() { counter += 1 }
        }
    }
}