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use crate::resolve::Resolve;
use anyhow::Error;
use lru::LruCache;
use std::sync::Mutex;
use swc_common::FileName;
#[derive(Debug)]
pub struct CachingResolver<R>
where
R: Resolve,
{
cache: Mutex<LruCache<(FileName, String), FileName>>,
inner: R,
}
impl<R> Default for CachingResolver<R>
where
R: Resolve + Default,
{
fn default() -> Self {
Self::new(40, Default::default())
}
}
impl<R> CachingResolver<R>
where
R: Resolve,
{
pub fn new(cap: usize, inner: R) -> Self {
Self {
cache: Mutex::new(LruCache::new(cap)),
inner,
}
}
}
impl<R> Resolve for CachingResolver<R>
where
R: Resolve,
{
fn resolve(&self, base: &FileName, src: &str) -> Result<FileName, Error> {
{
let lock = self.cache.lock();
match lock {
Ok(mut lock) => {
if let Some(v) = lock.get(&(base.clone(), src.to_string())) {
return Ok(v.clone());
}
}
Err(_) => {}
}
}
let resolved = self.inner.resolve(base, src)?;
{
let lock = self.cache.lock();
match lock {
Ok(mut lock) => {
lock.put((base.clone(), src.to_string()), resolved.clone());
}
Err(_) => {}
}
}
Ok(resolved)
}
}