Roomdatabase subclass

gistfile1.txt

@Database(entities = {objects.ChecklistItem.class, OfflineData.class}, version = 4, exportSchema = false)
@TypeConverters({DateConverter.class, GeopointsConverter.class})
public abstract class   DbChecklist extends RoomDatabase {

    private static final Object LOCK = new Object();
    private static final String DATABASE_NAME = "****.db";
    private static DbChecklist sInstance;

    public static DbChecklist getsInstance(Context context) {
        //to make sure that Singleton Pattern is followed
        //i.e. only one object of the class is created.
        if (sInstance == null) {
            synchronized (LOCK) {
                sInstance = Room.databaseBuilder(context.getApplicationContext(),
                        DbChecklist.class, DbChecklist.DATABASE_NAME)
                        .addMigrations(MIGRATION_3_4)
                        .build();
            }
        }
        return sInstance;
    }