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use crate::mapref::multiple::RefMulti;
use crate::rayon::map::Iter;
use crate::ReadOnlyView;
use core::hash::{BuildHasher, Hash};
use rayon::iter::IntoParallelIterator;
impl<K, V, S> IntoParallelIterator for ReadOnlyView<K, V, S>
where
K: Send + Eq + Hash,
V: Send,
S: Send + Clone + BuildHasher,
{
type Iter = super::map::OwningIter<K, V, S>;
type Item = (K, V);
fn into_par_iter(self) -> Self::Iter {
super::map::OwningIter {
shards: self.map.shards,
}
}
}
// This impl also enables `IntoParallelRefIterator::par_iter`
impl<'a, K, V, S> IntoParallelIterator for &'a ReadOnlyView<K, V, S>
where
K: Send + Sync + Eq + Hash,
V: Send + Sync,
S: Send + Sync + Clone + BuildHasher,
{
type Iter = Iter<'a, K, V, S>;
type Item = RefMulti<'a, K, V, S>;
fn into_par_iter(self) -> Self::Iter {
Iter {
shards: &self.map.shards,
}
}
}
#[cfg(test)]
mod tests {
use crate::DashMap;
use rayon::iter::{IntoParallelIterator, IntoParallelRefIterator, ParallelIterator};
fn construct_sample_map() -> DashMap<i32, String> {
let map = DashMap::new();
map.insert(1, "one".to_string());
map.insert(10, "ten".to_string());
map.insert(27, "twenty seven".to_string());
map.insert(45, "forty five".to_string());
map
}
#[test]
fn test_par_iter() {
let map = construct_sample_map();
let view = map.clone().into_read_only();
view.par_iter().for_each(|entry| {
let key = *entry.key();
assert!(view.contains_key(&key));
let map_entry = map.get(&key).unwrap();
assert_eq!(view.get(&key).unwrap(), map_entry.value());
let key_value: (&i32, &String) = view.get_key_value(&key).unwrap();
assert_eq!(key_value.0, map_entry.key());
assert_eq!(key_value.1, map_entry.value());
});
}
#[test]
fn test_into_par_iter() {
let map = construct_sample_map();
let view = map.clone().into_read_only();
view.into_par_iter().for_each(|(key, value)| {
let map_entry = map.get(&key).unwrap();
assert_eq!(&key, map_entry.key());
assert_eq!(&value, map_entry.value());
});
}
}
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