How to know when callback are finished ?

[istornz]

Hello,
I want to know when the callback is finished. I try to populated the DB but I can't know when the populating process is finished ...

final callback = Callback(onCreate: (database, version) {  }, onOpen: (database) {
      // How to know when this is finished ?
      });
    });

I tried to add "async" on onOpen func but it doesn't work ...

final callback = Callback(onCreate: (database, version) {  }, onOpen: (database)  async {
     final String = await [...]; // It's doesn't work :/
      });
    });

Any help would be greatly appreciated :)

[vitusortner]

Hi! Could you describe your use case a bit more and tell me exactly what's not working? Thanks in advance.

[istornz]

Hi @vitusortner !
Thanks for your reply !

So, I want to pre-populate the database at the first startup (in order to inject static data).
To do that:

1. Created a Singleton to keep the reference of the database across my app (without pass it to all my widgets).
2. I added a callback and assign it on the "onCreate" state. This callback call a transactional queries (delete all & insert a list of objects).
3. The main problem is: I don't know when the transactional operation is finished (or not). So when I try to call the instance in other widget, data are not present (because the insert is not terminated). When I start again the app, it works.

Thanks for your time & your awesome lib !

[istornz]

I managed to pass around this "issue" by hooking the initialization process:

MyFlutterDB initiatedDb = await $FloorMyFlutterDB.databaseBuilder('cache.db').build();
await _setupDB(initiatedDb); // Here i pre-populate my database
return initiatedDb; // Return the initiated db AFTER the setup

Note: I use a Singleton pattern and it works just fine.

[vitusortner]

Callback's functions work asynchronously. This means that they will be invoked sometime later. blocking their execution by adding async and await won't make the event looper stop until the initialization is done.