1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
use crate::weight::{WeightScale, ZeroWeightScale};
use std::collections::hash_map::RandomState;
use std::hash::BuildHasher;
use std::marker::PhantomData;
use std::num::NonZeroUsize;
/// A configuration structure used to create an LRU cache.
pub struct CLruCacheConfig<K, V, S = RandomState, W = ZeroWeightScale> {
pub(crate) capacity: NonZeroUsize,
pub(crate) hash_builder: S,
pub(crate) reserve: Option<usize>,
pub(crate) scale: W,
_marker: PhantomData<(K, V)>,
}
impl<K, V> CLruCacheConfig<K, V> {
/// Creates a new configuration that will create an LRU cache
/// that will hold at most `capacity` elements and default parameters.
pub fn new(capacity: NonZeroUsize) -> Self {
Self {
capacity,
hash_builder: RandomState::default(),
reserve: None,
scale: ZeroWeightScale,
_marker: PhantomData,
}
}
}
impl<K, V, S: BuildHasher, W: WeightScale<K, V>> CLruCacheConfig<K, V, S, W> {
/// Configure the provided hash builder.
pub fn with_hasher<O: BuildHasher>(self, hash_builder: O) -> CLruCacheConfig<K, V, O, W> {
let Self {
capacity,
reserve,
scale,
_marker,
..
} = self;
CLruCacheConfig {
capacity,
hash_builder,
reserve,
scale,
_marker,
}
}
/// Configure the amount of pre-allocated memory in order to hold at least `reserve` elements
/// without reallocating.
pub fn with_memory(mut self, reserve: usize) -> Self {
self.reserve = Some(reserve);
self
}
/// Configure the provided scale.
pub fn with_scale<O: WeightScale<K, V>>(self, scale: O) -> CLruCacheConfig<K, V, S, O> {
let Self {
capacity,
hash_builder,
reserve,
..
} = self;
CLruCacheConfig {
capacity,
hash_builder,
reserve,
scale,
_marker: PhantomData,
}
}
}
|
