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use crate::result::{Measurement, OpMeasurements, Operation};
use crate::specification::{Change, Create, FileCount};
use std::time::Instant;
/// A step in the execution of a benchmark.
#[derive(Debug)]
pub enum Step {
/// Start a benchmark.
Start(
/// Unique name of the benchmark.
String,
),
/// Finish a benchmark with a given name.
Stop(
/// Unique name of the benchmark.
String,
),
/// Create test data files.
Create(Create),
/// Rename test data files.
Rename(FileCount),
/// Delete test data files.
Delete(FileCount),
/// Make the nth backup in the benchmark.
Backup(
/// n
usize,
),
/// Restore the nth backup in the benchmark.
Restore(
/// n
usize,
),
}
/// Possible errors from executing a benchmark step.
#[derive(Debug, thiserror::Error)]
pub enum StepError {
/// Generic I/O error.
#[error(transparent)]
Io(std::io::Error),
}
impl Step {
pub(crate) fn from(change: &Change) -> Self {
match change {
Change::Create(x) => Self::Create(x.clone()),
Change::Rename(x) => Self::Rename(x.clone()),
Change::Delete(x) => Self::Delete(x.clone()),
}
}
pub fn execute(
&self,
current: &mut Option<String>,
) -> Result<Option<OpMeasurements>, StepError> {
let now = Instant::now();
let om = match self {
Self::Start(name) => {
*current = Some(name.to_string());
None
}
Self::Stop(_) => {
*current = None;
None
}
Self::Create(x) => {
create_files(x)?;
None
}
Self::Rename(x) => {
rename_files(x)?;
None
}
Self::Delete(x) => {
delete_files(x)?;
None
}
Self::Backup(x) => Some(backup(*x, current.as_ref().unwrap())?),
Self::Restore(x) => Some(restore(*x, current.as_ref().unwrap())?),
};
let t = std::time::Duration::from_millis(10);
std::thread::sleep(t);
if let Some(mut om) = om {
let ms = now.elapsed().as_millis();
om.push(Measurement::DurationMs(ms));
Ok(Some(om))
} else {
Ok(None)
}
}
}
fn backup(i: usize, current: &str) -> Result<OpMeasurements, StepError> {
let mut om = OpMeasurements::new(current, Operation::Backup(i));
om.push(Measurement::TotalFiles(0));
om.push(Measurement::TotalData(0));
Ok(om)
}
fn restore(i: usize, current: &str) -> Result<OpMeasurements, StepError> {
Ok(OpMeasurements::new(current, Operation::Restore(i)))
}
fn create_files(_: &Create) -> Result<(), StepError> {
Ok(())
}
fn rename_files(_: &FileCount) -> Result<(), StepError> {
Ok(())
}
fn delete_files(_: &FileCount) -> Result<(), StepError> {
Ok(())
}
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