export function SynchronizedMixin(Superclass) {

  return class Synchronized extends Superclass {

    constructor() {
      super();
      this._idempotentPackets = [];
    }

    cleanPackets() {
      this._idempotentPackets = [];
    }

    packetsAreIdempotent() {
      return true;
    }

    packets(informed) {
      if (this._idempotentPackets.length > 0) {
        return this._idempotentPackets;
      }
      let packets = this.packetsForTick(informed);
      if (!packets) {
        return [];
      }
      packets = Array.isArray(packets) ? packets : [packets];
      if (this.packetsAreIdempotent()) {
        this._idempotentPackets = packets;
      }
      return packets;
    }

    packetsForTick(informed) {}

  }

}