@Override
public void readObject(BufferInput buffer, Serializer serializer) {
super.readObject(buffer, serializer);
mode = PersistenceMode.values()[buffer.readByte()];
ttl = buffer.readLong();
}
@Override
public void writeObject(BufferOutput buffer, Serializer serializer) {
super.writeObject(buffer, serializer);
buffer.writeByte(mode.ordinal()).writeLong(ttl);
}