@croct/plug-react/hooks/Cache.js

React components and hooks to plug your React applications into Croct.

class Cache {
  constructor(defaultExpiration) {
    this.cache = {};
    this.defaultExpiration = defaultExpiration;
  }
  load(configuration) {
    const { cacheKey, loader, fallback, expiration = this.defaultExpiration } = configuration;
    const cachedEntry = this.get(cacheKey);
    if (cachedEntry !== void 0) {
      if (cachedEntry.error !== void 0) {
        if (fallback !== void 0) {
          return fallback;
        }
        if (cachedEntry.result === void 0) {
          throw cachedEntry.error;
        }
      }
      if (cachedEntry.result !== void 0) {
        return cachedEntry.result;
      }
      throw cachedEntry.promise;
    }
    const entry = {
      dispose: () => {
        if (entry.timeout !== void 0 || expiration < 0) {
          return;
        }
        entry.timeout = window.setTimeout(
          () => {
            delete this.cache[cacheKey];
          },
          expiration
        );
      },
      promise: loader().then((result) => {
        entry.result = result;
        return result;
      }).catch((error) => {
        entry.result = fallback;
        entry.error = error;
        return fallback;
      }).finally(() => {
        entry.dispose();
      })
    };
    this.cache[cacheKey] = entry;
    throw entry.promise;
  }
  get(cacheKey) {
    const entry = this.cache[cacheKey];
    if (entry === void 0) {
      return void 0;
    }
    if (entry.timeout !== void 0) {
      clearTimeout(entry.timeout);
      delete entry.timeout;
      entry.dispose();
    }
    return entry;
  }
}
export {
  Cache
};