swc_ecma_loader/resolvers/
lru.rs

1use std::num::NonZeroUsize;
2
3use anyhow::Error;
4use lru::LruCache;
5use parking_lot::Mutex;
6use swc_common::FileName;
7
8use crate::resolve::{Resolution, Resolve};
9
10#[derive(Debug)]
11pub struct CachingResolver<R>
12where
13    R: Resolve,
14{
15    cache: Mutex<LruCache<(FileName, String), Resolution>>,
16    inner: R,
17}
18
19impl<R> Default for CachingResolver<R>
20where
21    R: Resolve + Default,
22{
23    fn default() -> Self {
24        Self::new(40, Default::default())
25    }
26}
27
28impl<R> CachingResolver<R>
29where
30    R: Resolve,
31{
32    pub fn new(cap: usize, inner: R) -> Self {
33        Self {
34            cache: Mutex::new(LruCache::new(
35                NonZeroUsize::try_from(cap).expect("cap == 0"),
36            )),
37            inner,
38        }
39    }
40}
41
42impl<R> Resolve for CachingResolver<R>
43where
44    R: Resolve,
45{
46    fn resolve(&self, base: &FileName, src: &str) -> Result<Resolution, Error> {
47        {
48            let mut lock = self.cache.lock();
49            //
50            if let Some(v) = lock.get(&(base.clone(), src.to_string())) {
51                return Ok(v.clone());
52            }
53        }
54
55        let resolved = self.inner.resolve(base, src)?;
56        {
57            let mut lock = self.cache.lock();
58            lock.put((base.clone(), src.to_string()), resolved.clone());
59        }
60
61        Ok(resolved)
62    }
63}
swc_ecma_loader/resolvers/lru.rs

swc_ecma_loader/resolvers/
lru.rs
