/**
 * 单例模式装饰器
 *
 * @export
 * @param {*} [params]
 * @returns {*}
 */
export function SingletonMode(params?: any): any {
  /**
   * 装饰器处理
   */
  return function(target: any) {
    return class Singleton extends target {
      /**
       * 唯一实例
       *
       * @private
       * @static
       * @type {Singleton}
       */
      private static readonly instance: Singleton = new Singleton();
      /**
       * Creates an instance of Singleton.
       */
      constructor(...args: any[]) {
        if (Singleton.instance) {
          return Singleton.instance;
        }
        super(...args);
      }
      /**
       * 获取唯一实例
       *
       * @static
       * @returns {Singleton}
       */
      static getInstance(): Singleton {
        return this.instance;
      }
    };
  };
}