CODEWITHSUNDEEP
c#realm
Cursed
Cursed

Reputation: 1003

Realm .NET can't access a realmobject from another thread

Based on this answer, I find out that I can't access a realm object from another thread, but from the answer, I understood that I can store the reference of the realmobject and then use it inside another thread.

I want to loop it until it's inserted but the problem is that I can't access the var document and var s on another thread. How then I can find a workaround for that problem?

private async void UpdateNotifications_OnAdd(object sender, EventArgs e)
{
    //UpdateNotification is my RealmObject
    var s = (UpdateNotifications)sender;
    //Here I want to find the document that has the id from my updateNotification
    var document = realm.Find<Document>(s.Identifier)

    await Task.Run(async () =>
    {
        while(!s.Inserted)
        {
            //Here I want to access my document and my S
            string text = queryFinder(document)
            realm.Write(() =>
            {
                s.Inserted = true;
            });
        }
    }
}

Upvotes: 1

Views: 321

Answers (1)

Nikola Irinchev
Nikola Irinchev

Reputation: 2186

The answer says you can store a reference to the Id of the object then requery that (use realm.Find) on the background thread. It is a bit old though and there's a better way to do it today - using a ThreadSafeReference. That being said, your code won't work because you are using a Realm instance from the main thread on a background thread, which is also disallowed. You would need to refactor it a little so that it kinda looks like this:

private async void UpdateNotifications_OnAdd(object sender, EventArgs e)
{
    var notifications = (UpdateNotifications)sender;
    var document = realm.Find<Document>(notifications.Identifier);

    // Create thread safe references to notifications and document.
    // We'll use them to look up the objects in the background.
    var notificationsRef = ThreadSafeReference.Create(notifications);
    var documentRef = ThreadSafeReference.Create(document);

    await Task.Run(async () =>
    {
        // Always dispose of the Realm on a background thread
        using bgRealm = Realm.GetInstance();

        // We need to look up the notifications and document objects
        // on the background thread from the references we created
        var bgNotifications = bgRealm.Resolve(notificationsRef);
        var bgDocument = bgRealm.Resolve(documentRef;)

        string text = queryFinder(bgDocument);
        bgRealm.Write(() =>
        {
            bgNotifications.Inserted = true;
        });
    }
}

Upvotes: 3

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