forked from rust-lang/futures-rs
/
record_spawner.rs
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/
record_spawner.rs
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use futures_task::{Spawn, SpawnError, FutureObj};
use std::cell::{Ref, RefCell};
/// An implementation of [`Spawn`](futures_task::Spawn) that records
/// any [`Future`](futures_core::future::Future)s spawned on it.
///
/// # Examples
///
/// ```
/// use futures::task::SpawnExt;
/// use futures_test::task::RecordSpawner;
///
/// let mut recorder = RecordSpawner::new();
/// recorder.spawn(async { }).unwrap();
/// assert_eq!(recorder.spawned().len(), 1);
/// ```
#[derive(Debug, Default)]
pub struct RecordSpawner {
spawned: RefCell<Vec<FutureObj<'static, ()>>>,
}
impl RecordSpawner {
/// Create a new instance
pub fn new() -> Self {
Default::default()
}
/// Inspect any futures that were spawned onto this [`Spawn`].
pub fn spawned(&self) -> Ref<'_, Vec<FutureObj<'static, ()>>> {
self.spawned.borrow()
}
}
impl Spawn for RecordSpawner {
fn spawn_obj(
&self,
future: FutureObj<'static, ()>,
) -> Result<(), SpawnError> {
self.spawned.borrow_mut().push(future);
Ok(())
}
}