I'm building app that uses Persistable object to store data. Before i stored only simple data types, such as int/string and everyting was find. Some time ago i tried to store Hashtable that also implement persistable interfaces, and according to documentation must me stored without any problem
public class PhotoShareProperties implements Persistable{
private String access_token;
private Hashtable albums2;
private static final long PERSISTENCE_ID = 0x2abgf1c291f4412dL;
private static PersistentObject store;
static {
store = PersistentStore.getPersistentObject(PERSISTENCE_ID);
synchronized (store) {
if (store.getContents() == null) {
store.setContents(new PhotoShareProperties());
store.commit();
}
}
}
private PhotoShareProperties()
{
access_token="";
albums2=null;
}
public static PhotoShareProperties fetch()
{
PhotoShareProperties savedProps =
(PhotoShareProperties) store.getContents();
return new PhotoShareProperties(savedProps);
}
public void save()
{
synchronized (store) {
store.setContents(this);
store.commit();
}
}
public void setAlbums(BigVector albumsLocal)
{
albums2=null;
if (albums2==null)
albums2=new Hashtable();
for (int i=0; i<albumsLocal.size();i++)
{
Hashtable alb_tmp=new Hashtable();
Album a=(Album) albumsLocal.elementAt(i);
alb_tmp.put("name", a.name);
alb_tmp.put("uid", a.uid);
albums2.put(String.valueOf(i),alb_tmp);
}
}
}
There are also some getters setters and fields that i haven't included, but they don't make sense here.
I am using separate thread to get data from network and store it in ths persistant object.
There is something like this:
PhotoShareProperties optionProperties = PhotoShareProperties.fetch();
optionProperties.setAccessToken(_access_token);
optionProperties.setAlbums(_album_list);
optionProperties.save();
optionProperties=VKPhotoShareProperties.fetch();
Last line is used for testing. Problem is that before calling save (and also after it) object got all the fields as it should. But after fetching (even if i fetch after a decent amount of time, so that save should have finished normally) albums2 field becaming NULL. It looks a kind like magic, everything saved without warnings, other fields (that are basis data types such as string) are saved and fetched normally, only hashtable disappear.
p.s. i am using Blackberry SDK for OS 5, app is debugged on Blackberry 9700 smartphone with OS6 installed.
