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
140

// Copyright (C) 2016-2017 Pietro Albini
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

use std::sync::{Arc, mpsc};

use fisher_common::prelude::*;
use fisher_common::state::State;
use fisher_common::structs::HealthDetails;

use scheduler::{Scheduler, SchedulerInput};
#[cfg(test)] use scheduler::DebugDetails;
use timer::Timer;
use types::{Job, JobContext};


/// This struct allows you to spawn a new processor, stop it and get its
/// [`ProcessorApi`](struct.ProcessorApi.html).

#[derive(Debug)]
pub struct Processor<S: ScriptsRepositoryTrait + 'static> {
    input: mpsc::Sender<SchedulerInput<S>>,
    timer: Timer,
    wait: mpsc::Receiver<()>,
}

impl<S: ScriptsRepositoryTrait> Processor<S> {

    /// Create a new processor with the provided configuration. The returned
    /// struct allows you to control it.
    pub fn new(max_threads: u16, hooks: Arc<S>, ctx: Arc<JobContext<S>>,
               state: Arc<State>) -> Result<Self> {
        // Retrieve wanted information from the spawned thread
        let (input_send, input_recv) = mpsc::sync_channel(0);
        let (wait_send, wait_recv) = mpsc::channel();

        ::std::thread::spawn(move || {
            let inner = Scheduler::new(
                max_threads, hooks, ctx, state,
            );
            input_send.send(inner.input()).unwrap();

            inner.run().unwrap();

            // Notify the main thread this exited
            wait_send.send(()).unwrap();
        });

        let processor = Processor {
            input: input_recv.recv()?,
            timer: Timer::new(),
            wait: wait_recv,
        };

        // Set up the cleanup timer
        let api = processor.api();
        processor.timer.add_task(30, move || {
            let _ = api.cleanup();
        })?;

        Ok(processor)
    }

    /// Stop this processor, and return only when the processor is stopped.
    pub fn stop(self) -> Result<()> {
        // Stop the timer
        self.timer.stop()?;

        // Ask the processor to stop
        self.input.send(SchedulerInput::StopSignal)?;
        self.wait.recv()?;

        Ok(())
    }

    /// Get a struct allowing you to control the processor.
    pub fn api(&self) -> ProcessorApi<S> {
        ProcessorApi {
            input: self.input.clone(),
        }
    }
}


/// This struct allows you to interact with a running processor.

#[derive(Debug, Clone)]
pub struct ProcessorApi<S: ScriptsRepositoryTrait> {
    input: mpsc::Sender<SchedulerInput<S>>,
}

impl<S: ScriptsRepositoryTrait> ProcessorApi<S> {

    #[cfg(test)]
    pub fn debug_details(&self) -> Result<DebugDetails<S>> {
        let (res_send, res_recv) = mpsc::channel();
        self.input.send(SchedulerInput::DebugDetails(res_send))?;
        Ok(res_recv.recv()?)
    }
}

impl<S: ScriptsRepositoryTrait> ProcessorApiTrait<S> for ProcessorApi<S> {

    fn queue(&self, job: Job<S>, priority: isize) -> Result<()> {
        self.input.send(SchedulerInput::Job(job, priority))?;
        Ok(())
    }

    fn health_details(&self) -> Result<HealthDetails> {
        let (res_send, res_recv) = mpsc::channel();
        self.input.send(SchedulerInput::HealthStatus(res_send))?;
        Ok(res_recv.recv()?)
    }

    fn cleanup(&self) -> Result<()> {
        self.input.send(SchedulerInput::Cleanup)?;
        Ok(())
    }

    fn lock(&self) -> Result<()> {
        self.input.send(SchedulerInput::Lock)?;
        Ok(())
    }

    fn unlock(&self) -> Result<()> {
        self.input.send(SchedulerInput::Unlock)?;
        Ok(())
    }
}