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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
use std::collections::{BTreeMap, HashMap};
use std::fs::File;
use std::hash::Hash;
use std::io::Write;
use std::io::Read;
use std::sync::{Arc, Mutex};
use crate::{ThreadSafeCachePersistTrait, ThreadSafeCacheTrait};
pub struct ThreadSafeCacheImpl<K: Eq + Hash, V > {
pub cache: HashMap<K, (V, u128)>,
pub expiration_set: BTreeMap<u128,Vec<K>>,
pub max_size: i32,
pub current_size: i32,
}
pub struct ThreadSafeCache<K: Eq + Hash + serde::de::DeserializeOwned, V: serde::de::DeserializeOwned> {
pub implementation: Arc<Mutex<ThreadSafeCacheImpl<K, V>>>,
}
impl <K: std::marker::Send + 'static + Clone + Eq + Hash + serde::Serialize + serde::de::DeserializeOwned,
V: std::marker::Send + Clone + serde::Serialize + serde::de::DeserializeOwned +'static> ThreadSafeCachePersistTrait<K, V> for ThreadSafeCache<K, V> {
fn save(&mut self, file_name: &str) {
let cloned = {
let md = self.implementation.lock().unwrap();
md.cache.clone()
};
let encoded: Vec<u8> = bincode::serialize(&cloned).unwrap();
let mut file = File::create(file_name).unwrap();
file.write_all(&encoded).unwrap();
}
fn load(&mut self, file_name: &str) {
let buf: HashMap<K, (V, u128)>;
let mut file = File::open(file_name).unwrap();
let mut encoded: Vec<u8> = Vec::new();
file.read_to_end(&mut encoded).unwrap();
buf = bincode::deserialize(&encoded[..]).unwrap();
let mut md = self.implementation.lock().unwrap();
md.cache = buf;
md.current_size = md.cache.len() as i32;
}
}
impl <K: std::marker::Send + 'static + Clone + Eq + Hash + serde::Serialize + serde::de::DeserializeOwned,
V: std::marker::Send + Clone + serde::Serialize + serde::de::DeserializeOwned +'static>ThreadSafeCacheTrait<K, V> for ThreadSafeCache<K, V> {
fn put(&mut self, key: K, val: V)
where K: Eq + Hash,
{
let mut md = self.implementation.lock().unwrap();
if md.current_size == md.max_size {
let last_opt = md.expiration_set.pop_first();
if let Some((_, last)) = last_opt {
for key in last {
md.cache.remove(&key);
md.current_size = md.current_size - 1;
}
}
}
if !md.cache.contains_key(&key) {
md.current_size = md.current_size + 1;
}
let now = std::time::SystemTime::now();
let year:u128 = 1000 * 60 * 60 * 24 * 365;
let milliseconds_from_now = now.duration_since(std::time::UNIX_EPOCH).unwrap().as_millis() + year;
md.cache.insert(key.clone(), (val, milliseconds_from_now));
md.expiration_set.entry(milliseconds_from_now)
.and_modify(|curr| curr.push(key.clone())).or_insert({
let mut ret = Vec::new();
ret.push(key);
ret
});
}
fn put_exp(&mut self, key: K, val: V, expiration: i32)
where K: Eq + Hash + Clone,
{
let mut md = self.implementation.lock().unwrap();
if md.current_size == md.max_size {
let last_opt = md.expiration_set.pop_first();
if let Some((_, last)) = last_opt {
for key in last {
md.cache.remove(&key);
md.current_size = md.current_size - 1;
}
}
}
if !md.cache.contains_key(&key) {
md.current_size = md.current_size + 1;
}
let now = std::time::SystemTime::now();
let milliseconds_from_now = now.duration_since(std::time::UNIX_EPOCH).unwrap().as_millis() + expiration as u128;
md.cache.insert(key.clone(), (val, milliseconds_from_now));
md.expiration_set.entry(milliseconds_from_now)
.and_modify(|curr| curr.push(key.clone())).or_insert({
let mut ret = Vec::new();
ret.push(key);
ret
});
}
fn get(&mut self, key: K) -> Option<V>
where K: Eq + Hash, V: Clone
{
let md = self.implementation.lock().unwrap();
let ret = md.cache.get(&key).map(|s| s.clone());
if ret.is_some() {
let (val, expiration) = ret.unwrap();
if expiration > 0 {
let now = std::time::SystemTime::now();
let milliseconds_now = now.duration_since(std::time::UNIX_EPOCH).unwrap().as_millis() as u128;
if milliseconds_now > expiration {
return None;
}
}
return Some(val);
} else {
return None;
}
}
fn exists(&mut self, key: K) -> bool
where K: Eq + Hash, V: Clone
{
let md = self.implementation.lock().unwrap();
let ret = md.cache.contains_key(&key);
ret
}
fn rm(&mut self, key: K)
where K: Eq + Hash,
{
let mut md = self.implementation.lock().unwrap();
let r = md.cache.remove(&key);
if r.is_some() {
md.current_size = md.current_size - 1;
}
}
}
impl <K: std::marker::Send + 'static + Clone + Eq + Hash + serde::Serialize + serde::de::DeserializeOwned,
V: std::marker::Send + Clone + serde::Serialize + serde::de::DeserializeOwned +'static>ThreadSafeCache<K, V> {
pub fn clean(&mut self) -> bool
{
let mut md = self.implementation.lock().unwrap();
let now = std::time::SystemTime::now();
let milliseconds_now = now.duration_since(std::time::UNIX_EPOCH).unwrap().as_millis() as u128;
let new_expiration_set = md.expiration_set.split_off(&milliseconds_now);
let keys: Vec<K> = md.expiration_set.iter().map(|(_, keys)| {
keys.clone()
}).flatten().collect();
for key in keys {
let r = md.cache.remove(&key);
if r.is_some() {
md.current_size = md.current_size - 1;
}
}
md.expiration_set = new_expiration_set;
true
}
}
impl<K: Eq + Hash + serde::de::DeserializeOwned + serde::Serialize, V: serde::de::DeserializeOwned + serde::Serialize> Clone for ThreadSafeCache<K, V> {
fn clone(&self) -> ThreadSafeCache<K, V> {
ThreadSafeCache {
implementation: Arc::clone(&self.implementation),
}
}
}