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81 lines
1.8 KiB
81 lines
1.8 KiB
//! This module provides a facade for an abstract concurrent job executor.
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//!
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//! Mostly here to insulate the rest of this crate from the exact details of
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//! the executor implementation.
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use threadpool;
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/// Default number of threads spawned by Executor instances
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const NUM_THREADS: usize = 8;
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/// The trait of objects that can be run by an Executor.
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pub trait Job: Send {
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fn execute(self: Box<Self>);
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}
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/// A concurrent job execution engine.
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pub struct Executor {
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/// Executes the jobs.
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pool: threadpool::ThreadPool,
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}
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impl Executor {
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/// Builds a new executor with a default number of threads.
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pub fn new() -> Self {
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Self {
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pool: threadpool::Builder::new()
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.num_threads(NUM_THREADS)
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.thread_name("Executor".to_string())
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.build(),
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}
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}
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/// Schedules execution of the given job on this executor.
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pub fn schedule(&self, job: Box<dyn Job>) {
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self.pool.execute(move || job.execute());
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}
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/// Blocks until all scheduled jobs are executed.
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pub fn join(self) {
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self.pool.join();
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}
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}
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#[cfg(test)]
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mod tests {
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use std::io;
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use std::sync::{Arc, Barrier};
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use super::{Executor, Job};
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#[test]
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fn immediate_join() {
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Executor::new().join()
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}
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struct Waiter {
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pub barrier: Arc<Barrier>,
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}
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impl Job for Waiter {
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fn execute(self: Box<Self>) {
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self.barrier.wait();
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}
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}
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#[test]
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fn join_waits_for_all_jobs() {
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let executor = Executor::new();
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let barrier = Arc::new(Barrier::new(2));
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executor.schedule(Box::new(Waiter {
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barrier: barrier.clone(),
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}));
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executor.schedule(Box::new(Waiter {
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barrier: barrier.clone(),
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}));
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executor.join();
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}
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}
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