priority = in.readInt();
priority = in.readByte();
   public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException   {           messageID = (Serializable)in.readObject();      reliable = in.readBoolean();      expiration = in.readLong();      timestamp = in.readLong();      headers = readMap(in);      redelivered = in.readBoolean();      priority = in.readInt();      deliveryCount = in.readInt();      ordering = in.readLong();   }