Method getOrSet

src/app/cache.ts:125–132

(key: string, set: () => Promise<T> | T)

class Cache extends ExtCache {
  public async getOrSet<T>(key: string, set: () => Promise<T> | T): Promise<T> {
    let ret = await this.get<T>(key);
    if (!ret) {
      ret = await set();
      this.set(key, ret);
    }
    return ret;
  }

  // 事务处理,如果有事务正在进行,则等待
  public tx<T, CB extends (val: T | undefined, tx: { set: (newVal: T) => void; del: () => void }) => any>(