56 lines
1.1 KiB
Rust
56 lines
1.1 KiB
Rust
use std::{hash::Hash, sync::Arc};
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type Value<Val> = tokio::sync::Mutex<Val>;
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type ArcMutex<Val> = Arc<Value<Val>>;
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type HashMap<Key, Val> = std::collections::HashMap<Key, ArcMutex<Val>>;
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type MapMutex<Key, Val> = std::sync::Mutex<HashMap<Key, Val>>;
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type Map<Key, Val> = MapMutex<Key, Val>;
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/// Map of Mutexes
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pub struct MutexMap<Key, Val> {
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map: Map<Key, Val>,
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}
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pub struct Guard<Val> {
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_guard: tokio::sync::OwnedMutexGuard<Val>,
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}
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impl<Key, Val> MutexMap<Key, Val>
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where
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Key: Send + Hash + Eq + Clone,
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Val: Send + Default,
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{
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#[must_use]
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pub fn new() -> Self {
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Self {
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map: Map::<Key, Val>::new(HashMap::<Key, Val>::new()),
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}
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}
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pub async fn lock<K>(&self, k: &K) -> Guard<Val>
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where
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K: ?Sized + Send + Sync,
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Key: for<'a> From<&'a K>,
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{
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let val = self
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.map
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.lock()
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.expect("map mutex locked")
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.entry(k.into())
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.or_default()
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.clone();
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let guard = val.lock_owned().await;
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Guard::<Val> {
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_guard: guard,
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}
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}
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}
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impl<Key, Val> Default for MutexMap<Key, Val>
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where
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Key: Send + Hash + Eq + Clone,
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Val: Send + Default,
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{
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fn default() -> Self { Self::new() }
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}
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