BlackBerry Persistent Store Demo

BlackBerry? Persistent Store:

Class and Demo code:

Class: BerrySyncPersistentStore?.java

package BerrySync?.data;

import net.rim.device.api.system.PersistentObject?;
import net.rim.device.api.system.PersistentStore?;

public class BerrySyncPersistentStore? {

*

Static Utility Functions

*
public static void SaveData?(long _key, Object _data) throws Exception {

Create a persistent data store
PersistentObject? _store;
_store = PersistentStore?.getPersistentObject(_key);

Store Persistent data
synchronized(_store){

_store.setContents(_data);
_store.commit();

}

}

public static Object LoadData?(long _key) throws Exception {

Create a persistent data store
PersistentObject? _store;
_store = PersistentStore?.getPersistentObject(_key);

Retrieve persistent data
Object _data;
synchronized(_store) {

_data = (Object)_store.getContents();

}
return _data;

}

}

Class: Record.java

package BerrySync?.data;

import net.rim.device.api.crypto.AESKey;
import net.rim.device.api.crypto.InitializationVector?;
import net.rim.device.api.util.Persistable;

public class Record implements Persistable{

public String _data;
public String _payload;
public String _collection;
public String _id;
public String _modified;
public int _ttl;
public int _sortIndex;
public AESKey _key;
public InitializationVector? _iv;

}

Demo code: in FetchScreen?.java

Private inner classes

*
final private class SaveOB implements FieldChangeListener? {

public void fieldChanged(Field field, int context) {

try {

Record _data = new Record();
_data._data = "data 1";
_data._id = "id 1";

long _key = 0x4ee5665b495a4912L;
BerrySyncPersistentStore?.SaveData?(_key, _data);

_storeArea.setText("Save Object" + " | " + _data._data + " | " + _data._id);

}
catch(Exception e) {

_networkArea.setText(e.toString());

}

}

}

final private class LoadOB implements FieldChangeListener? {

public void fieldChanged(Field field, int context) {

try {

long _key = 0x4ee5665b495a4912L;
Record _data = (Record)BerrySyncPersistentStore?.LoadData?(_key);
if (_data == null) {

_storeArea.setText("Load Object" + _data);

}else{

_storeArea.setText("Load Object" + " | " + _data._data + " | " + _data._id);

}

}
catch(Exception e) {

_networkArea.setText(e.toString());

}

}

}