angular-caching
Version:
Lightweight library for data caching
50 lines • 7.62 kB
JavaScript
import { Observable } from 'rxjs';
import { publishReplay, refCount, take } from 'rxjs/operators';
export function InMemoryCache(params = {}) {
let originalFunc;
const cacheSize = params.cacheSize || 1;
const chacheTTL = params.ttl;
const cacheMap = new Map();
const timersMap = new Map();
return function (target, propertyKey, descriptor) {
originalFunc = descriptor.value;
descriptor.value = function (...args) {
if (!args.length && cacheSize > 1) {
throw new Error(`If you don't provide arguments, cache size could not be bigger then 1`);
}
const id = JSON.stringify(args);
const currentCacheSize = cacheMap.size;
let data = cacheMap.get(id);
if (!data) {
data = originalFunc.apply(this, args);
if (data instanceof Observable) {
data = data.pipe(publishReplay(1), refCount(), take(1));
}
if (currentCacheSize >= cacheSize) {
if (timersMap.has(cacheMap.keys()[0])) {
clearTimeout(timersMap.get(cacheMap.keys()[0]));
timersMap.delete(cacheMap.keys()[0]);
}
cacheMap.delete(cacheMap.keys()[0]);
}
if (params.sync) {
cacheMap.set(id, data);
}
else {
Promise.resolve().then(() => {
cacheMap.set(id, data);
});
}
if (chacheTTL || chacheTTL === 0) {
const timerId = setTimeout(() => {
cacheMap.delete(id);
timersMap.delete(id);
}, chacheTTL);
timersMap.set(id, timerId);
}
}
return data;
};
};
}
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