src/background/repositories/setting.js


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import MemoryStorage from '../infrastructures/memory-storage';

const CACHED_SETTING_KEY = 'setting';

export default class SettingRepository {
  constructor() {
    this.cache = new MemoryStorage();
  }

  get() {
    return Promise.resolve(this.cache.get(CACHED_SETTING_KEY));
  }

  update(value) {
    return this.cache.set(CACHED_SETTING_KEY, value);
  }

  async setProperty(name, value) {
    let current = await this.get();
    current.properties[name] = value;
    return this.update(current);
  }
}