@Override
 public void toData(DataOutput out) throws IOException {
   super.toData(out);
   out.writeByte(this.attributeCode);
   out.writeInt(this.newValue);
   out.writeInt(this.cacheId);
 }
 @Override
 public void toData(DataOutput out) throws IOException {
   super.toData(out);
   out.writeInt(this.id);
   DataSerializer.writeObject(this.healthCode, out);
 }
 @Override
 public void toData(DataOutput out) throws IOException {
   super.toData(out);
   out.writeInt(this.id);
 }