ecrs 0.1.0-beta.4

Evolutionary computation tools & algorithms
Documentation 
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use crate::ff::probe::Probe;
use serde::Serialize;

#[derive(Serialize)]
struct Record {
    iteration: u32,
    best_value: f64,
}

pub struct CsvProbe {
    filename: &'static str,
    records: Vec<Record>,
    iteration: u32,
    best_solution: f64,
    solution_position: Vec<f64>,
}

impl CsvProbe {
    pub fn new(filename: &'static str) -> CsvProbe {
        CsvProbe {
            filename,
            records: vec![],
            iteration: 0,
            best_solution: 0.0,
            solution_position: vec![],
        }
    }
}

impl Probe for CsvProbe {
    fn on_start(&mut self) {
        /* noop */
    }

    fn on_iteration_start(&mut self, iteration: u32) {
        self.iteration = iteration;
    }

    fn on_iteration_end(&mut self, _iteration: u32) {
        self.records.push(Record {
            iteration: self.iteration,
            best_value: self.best_solution,
        });
    }

    fn on_current_best(&mut self, solution: f64, position: &[f64]) {
        self.best_solution = solution;
        self.solution_position = Vec::from(position);
    }

    fn on_end(&mut self) {
        let mut writer = csv::WriterBuilder::new().from_path(self.filename).unwrap();

        for record in self.records.iter() {
            if writer.serialize(record).is_err() {
                eprintln!("Failed to serialize a record");
            }
        }

        if writer.flush().is_err() {
            eprintln!("Failed to save algorithm results");
        }
    }
}