#![cfg(all(feature = "std", feature = "dashmap"))]
use std::prelude::v1::*;
use crate::nanos::Nanos;
use crate::state::{InMemoryState, StateStore};
use crate::{clock, Quota, RateLimiter};
use crate::{middleware::NoOpMiddleware, state::keyed::ShrinkableKeyedStateStore};
use dashmap::DashMap;
use std::hash::Hash;
pub type DashMapStateStore<K> = DashMap<K, InMemoryState>;
impl<K: Hash + Eq + Clone> StateStore for DashMapStateStore<K> {
type Key = K;
fn measure_and_replace<T, F, E>(&self, key: &Self::Key, f: F) -> Result<T, E>
where
F: Fn(Option<Nanos>) -> Result<(T, Nanos), E>,
{
if let Some(v) = self.get(key) {
return v.measure_and_replace_one(f);
}
let entry = self.entry(key.clone()).or_default();
(*entry).measure_and_replace_one(f)
}
}
impl<K, C> RateLimiter<K, DashMapStateStore<K>, C, NoOpMiddleware<C::Instant>>
where
K: Hash + Eq + Clone,
C: clock::Clock,
{
pub fn dashmap_with_clock(quota: Quota, clock: &C) -> Self {
let state: DashMapStateStore<K> = DashMap::default();
RateLimiter::new(quota, state, clock)
}
}
impl<K: Hash + Eq + Clone> ShrinkableKeyedStateStore<K> for DashMapStateStore<K> {
fn retain_recent(&self, drop_below: Nanos) {
self.retain(|_, v| !v.is_older_than(drop_below));
}
fn shrink_to_fit(&self) {
self.shrink_to_fit();
}
fn len(&self) -> usize {
self.len()
}
fn is_empty(&self) -> bool {
self.is_empty()
}
}