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* Copyright 2020 Cognite AS
*/
type RequestDelegate<T_ID, T> = (id: T_ID) => Promise<T>;
interface SimpleCache<T_ID, T> {
request: RequestDelegate<T_ID, T>;
clearCache: () => void;
}
export function createSimpleCache<T_ID, T>(request: RequestDelegate<T_ID, T>): SimpleCache<T_ID, T> {
const results = new Map<T_ID, Promise<T>>();
const requestCached = async (id: T_ID) => {
const existing = results.get(id);
if (existing) {
return existing;
}
const result: Promise<T> = request(id);
results.set(id, result);
return result;
};
const clearCache = () => {
results.clear();
};
return {
request: requestCached,
clearCache
};
}
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