58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
/// Refresh coalescing shared by the event stores.
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#[derive(Debug, Default)]
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pub struct RefreshGate {
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running: bool,
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dirty: bool,
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debouncing: bool,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum RefreshRequest {
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/// No run or timer covers the request, start the debounce timer.
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Schedule,
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/// A run or pending timer already covers the request.
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Fold,
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}
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impl RefreshGate {
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pub fn running(&self) -> bool {
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self.running
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}
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pub fn debouncing(&self) -> bool {
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self.debouncing
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}
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/// A new refresh request arrived.
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///
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/// Folded into a follow-up run while one is in flight, dropped while the
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/// debounce timer is pending, otherwise starts the timer.
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pub fn request(&mut self) -> RefreshRequest {
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if self.running {
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self.dirty = true;
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RefreshRequest::Fold
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} else if self.debouncing {
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RefreshRequest::Fold
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} else {
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self.debouncing = true;
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RefreshRequest::Schedule
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}
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}
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pub fn begin(&mut self) {
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self.debouncing = false;
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self.running = true;
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}
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/// The run ended. Whether a request arrived while it ran.
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pub fn finish(&mut self) -> bool {
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self.running = false;
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std::mem::take(&mut self.dirty)
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}
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/// The run was abandoned, e.g. on error. Pending follow-up requests survive.
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pub fn abort(&mut self) {
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self.running = false;
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}
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}
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