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//! Bookkeeping to make sure only one long-running operation is being executed
//! at a time.
pub(crate) struct OpQueue<Args, Output> {
op_requested: Option<Args>,
op_in_progress: bool,
last_op_result: Output,
}
impl<Args, Output: Default> Default for OpQueue<Args, Output> {
fn default() -> Self {
Self { op_requested: None, op_in_progress: false, last_op_result: Default::default() }
}
}
impl<Args, Output> OpQueue<Args, Output> {
pub(crate) fn request_op(&mut self, data: Args) {
self.op_requested = Some(data);
}
pub(crate) fn should_start_op(&mut self) -> Option<Args> {
if self.op_in_progress {
return None;
}
self.op_in_progress = self.op_requested.is_some();
self.op_requested.take()
}
pub(crate) fn op_completed(&mut self, result: Output) {
assert!(self.op_in_progress);
self.op_in_progress = false;
self.last_op_result = result;
}
#[allow(unused)]
pub(crate) fn last_op_result(&self) -> &Output {
&self.last_op_result
}
pub(crate) fn op_in_progress(&self) -> bool {
self.op_in_progress
}
pub(crate) fn op_requested(&self) -> bool {
self.op_requested.is_some()
}
}
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