mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-23 22:33:17 +00:00
33 lines
603 B
JavaScript
33 lines
603 B
JavaScript
|
// A cache that expires.
|
||
|
|
module.exports = class Cache extends Map {
|
||
|
|
constructor() {
|
||
|
|
super();
|
||
|
|
this.timeout = 1000;
|
||
|
|
}
|
||
|
|
set(key, value) {
|
||
|
|
super.set(key, {
|
||
|
|
tid: setTimeout(this.delete.bind(this, key), this.timeout),
|
||
|
|
value,
|
||
|
|
});
|
||
|
|
}
|
||
|
|
get(key) {
|
||
|
|
let entry = super.get(key);
|
||
|
|
if (entry) {
|
||
|
|
return entry.value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
delete(key) {
|
||
|
|
let entry = super.get(key);
|
||
|
|
if (entry) {
|
||
|
|
clearTimeout(entry.tid);
|
||
|
|
super.delete(key);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
clear() {
|
||
|
|
for (let entry of this.values()) {
|
||
|
|
clearTimeout(entry.tid);
|
||
|
|
}
|
||
|
|
super.clear();
|
||
|
|
}
|
||
|
|
};
|