Refactor timer module

src/benchmark/executor.rs

@@ -5,7 +5,6 @@ use crate::options::{CmdFailureAction, CommandOutputPolicy, Options, OutputStyle
 use crate::output::progress_bar::get_progress_bar;
 use crate::shell::execute_and_time;
 use crate::timer::wallclocktimer::WallClockTimer;
-use crate::timer::{TimerStart, TimerStop};
 use crate::util::units::Second;
 
 use super::timing_result::TimingResult;

src/shell.rs

@@ -1,7 +1,6 @@
 use std::process::{ExitStatus, Stdio};
 
 use crate::options::Shell;
-use crate::timer::get_cpu_timer;
 
 use anyhow::{Context, Result};
 
@@ -30,7 +29,7 @@ pub fn execute_and_time(
     command: &str,
     shell: &Shell,
 ) -> Result<ExecuteResult> {
-    let cpu_timer = get_cpu_timer();
+    let cpu_timer = crate::timer::unix_timer::CPUTimer::start();
 
     let status = shell
         .command()
@@ -76,7 +75,7 @@ pub fn execute_and_time(
         .stderr(stderr)
         .spawn()
         .with_context(|| format!("Failed to run command '{}'", command))?;
-    let cpu_timer = get_cpu_timer(&child);
+    let cpu_timer = crate::timer::windows_timer::CPUTimer::start_for_process(&child);
     let status = child.wait()?;
 
     let (user_time, system_time) = cpu_timer.stop();

src/timer/mod.rs

@@ -1,30 +1,12 @@
-use std::process::Child;
-
 use crate::util::units::Second;
 
 pub mod wallclocktimer;
 
 #[cfg(windows)]
-mod windows_timer;
-#[cfg(windows)]
-pub use self::windows_timer::get_cpu_timer;
+pub mod windows_timer;
 
 #[cfg(not(windows))]
-mod unix_timer;
-#[cfg(not(windows))]
-pub use self::unix_timer::get_cpu_timer;
-
-/// Defines start functionality of a timer.
-pub trait TimerStart {
-    fn start() -> Self;
-    fn start_for_process(process: &Child) -> Self;
-}
-
-/// Defines stop functionality of a timer.
-pub trait TimerStop {
-    type Result;
-    fn stop(&self) -> Self::Result;
-}
+pub mod unix_timer;
 
 #[derive(Debug, Copy, Clone)]
 pub struct CPUTimes {

src/timer/unix_timer.rs

@@ -1,35 +1,22 @@
 #![cfg(not(windows))]
 
 use std::mem;
-use std::process::Child;
 
-use crate::timer::{CPUInterval, CPUTimes, TimerStart, TimerStop};
+use crate::timer::{CPUInterval, CPUTimes};
 use crate::util::units::Second;
 
-pub fn get_cpu_timer() -> Box<dyn TimerStop<Result = (Second, Second)>> {
-    Box::new(CPUTimer::start())
-}
-
-struct CPUTimer {
+pub struct CPUTimer {
     start_cpu: CPUTimes,
 }
 
-impl TimerStart for CPUTimer {
-    fn start() -> Self {
+impl CPUTimer {
+    pub fn start() -> Self {
         CPUTimer {
             start_cpu: get_cpu_times(),
         }
     }
 
-    fn start_for_process(_: &Child) -> Self {
-        Self::start()
-    }
-}
-
-impl TimerStop for CPUTimer {
-    type Result = (Second, Second);
-
-    fn stop(&self) -> Self::Result {
+    pub fn stop(&self) -> (Second, Second) {
         let end_cpu = get_cpu_times();
         let cpu_interval = cpu_time_interval(&self.start_cpu, &end_cpu);
         (cpu_interval.user, cpu_interval.system)

src/timer/wallclocktimer.rs

@@ -1,29 +1,19 @@
-use std::process::Child;
 use std::time::Instant;
 
-use crate::timer::{TimerStart, TimerStop};
 use crate::util::units::Second;
 
 pub struct WallClockTimer {
     start: Instant,
 }
 
-impl TimerStart for WallClockTimer {
-    fn start() -> WallClockTimer {
+impl WallClockTimer {
+    pub fn start() -> WallClockTimer {
         WallClockTimer {
             start: Instant::now(),
         }
     }
 
-    fn start_for_process(_: &Child) -> Self {
-        Self::start()
-    }
-}
-
-impl TimerStop for WallClockTimer {
-    type Result = Second;
-
-    fn stop(&self) -> Second {
+    pub fn stop(&self) -> Second {
         let duration = self.start.elapsed();
         duration.as_secs() as f64 + f64::from(duration.subsec_nanos()) * 1e-9
     }

src/timer/windows_timer.rs

@@ -7,35 +7,23 @@ use std::process::Child;
 use winapi::um::processthreadsapi::GetProcessTimes;
 use winapi::um::winnt::HANDLE;
 
-use crate::timer::{CPUTimes, TimerStart, TimerStop};
+use crate::timer::CPUTimes;
 use crate::util::units::Second;
 
 const HUNDRED_NS_PER_MS: i64 = 10;
 
-pub fn get_cpu_timer(process: &Child) -> Box<dyn TimerStop<Result = (Second, Second)>> {
-    Box::new(CPUTimer::start_for_process(process))
-}
-
-struct CPUTimer {
+pub struct CPUTimer {
     handle: RawHandle,
 }
 
-impl TimerStart for CPUTimer {
-    fn start() -> Self {
-        panic!()
-    }
-
-    fn start_for_process(process: &Child) -> Self {
+impl CPUTimer {
+    pub fn start_for_process(process: &Child) -> Self {
         CPUTimer {
             handle: process.as_raw_handle(),
         }
     }
-}
 
-impl TimerStop for CPUTimer {
-    type Result = (Second, Second);
-
-    fn stop(&self) -> Self::Result {
+    pub fn stop(&self) -> (Second, Second) {
         let times = get_cpu_times(self.handle);
         (
             times.user_usec as f64 * 1e-6,
@@ -62,7 +50,7 @@ fn get_cpu_times(handle: RawHandle) -> CPUTimes {
         // GetProcessTimes will exit with non-zero if success as per: https://msdn.microsoft.com/en-us/library/windows/desktop/ms683223(v=vs.85).aspx
         if res != 0 {
             // Extract times as laid out here: https://support.microsoft.com/en-us/help/188768/info-working-with-the-filetime-structure
-            // Both user_time and kernel_time are spans that the proces spent in either.
+            // Both user_time and kernel_time are spans that the process spent in either.
             let user: i64 = (((user_time.dwHighDateTime as i64) << 32)
                 + user_time.dwLowDateTime as i64)
                 / HUNDRED_NS_PER_MS;