1 unstable release
0.1.0 | Aug 29, 2023 |
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#4 in #tx
35KB
423 lines
treacle
A generic event debouncer for Rust, for grouping events which occur close together in time into a single event.
For example, you may have some templates which you want to reload whenever a template file changes. However, if many small changes are made to the template files in quick succession, it would be wasteful to reload the templates for every change; instead, a debouncer could be used to group the changes that occur at a similar time into a single change, so the templates are only reloaded once.
A new debouncer can be created with the
debouncer
function, which returns the debouncer in two halves: a tx (send) half and rx (receive) half. The
tx sends raw un-debounced events to the debouncer, and the rx receives the debounced events from
the debouncer. Both halves can be cloned to allow for multiple senders and receivers.
use std::{thread, time::Duration};
// Create a new debouncer which takes raw events of type `u32` and outputs
// debounced events of type `Vec<u32>`.
let (tx, rx) = treacle::debouncer::<u32, Vec<u32>, _>(
// Group events which occur in the same 500ms window.
Duration::from_millis(500),
// Combine raw events by pushing them to a vector.
|acc, raw_event| {
let mut events_vector = acc.unwrap_or_default();
events_vector.push(raw_event);
events_vector
});
thread::spawn(move || {
// Send two raw events in quick succession.
tx.send(10).unwrap();
tx.send(20).unwrap();
// Wait, then send more raw events.
thread::sleep(Duration::from_millis(500));
tx.send(30).unwrap();
tx.send(40).unwrap();
tx.send(50).unwrap();
});
assert_eq!(rx.recv().unwrap(), &[10, 20]);
assert_eq!(rx.recv().unwrap(), &[30, 40, 50]);