molstar
Version:
A comprehensive macromolecular library.
55 lines (54 loc) • 1.59 kB
JavaScript
;
/**
* Copyright (c) 2018-2020 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.createReference = createReference;
exports.createReferenceItem = createReferenceItem;
exports.createReferenceCache = createReferenceCache;
function createReference(value, usageCount = 0) {
return { value, usageCount };
}
function createReferenceItem(ref) {
return {
free: () => {
ref.usageCount -= 1;
},
value: ref.value
};
}
function createReferenceCache(hashFn, ctor, deleteFn) {
const map = new Map();
return {
get: (props) => {
const id = hashFn(props);
let ref = map.get(id);
if (!ref) {
ref = createReference(ctor(props));
map.set(id, ref);
}
ref.usageCount += 1;
return createReferenceItem(ref);
},
clear: () => {
map.forEach((ref, id) => {
if (ref.usageCount <= 0) {
if (ref.usageCount < 0) {
console.warn('Reference usageCount below zero.');
}
deleteFn(ref.value);
map.delete(id);
}
});
},
get count() {
return map.size;
},
dispose: () => {
map.forEach(ref => deleteFn(ref.value));
map.clear();
},
};
}