CODEWITHSUNDEEP
javaandroidrealm
Prasad Pawar
Prasad Pawar

Reputation: 1701

Realm database objects accessed from different thread issue (only on some devices)

I have a singleton class 'RealmDatabaseManager' where i have synchronized methods for reading/writing from realm local database.

The methods look like this:

public long getPendingImagesCount() {
    synchronized (this) {
        realm = Realm.getInstance(RealmUtils.getRealmConfiguration());
        long count = realm.where(PatientRecordImage.class)
                .count();
        realm.close();
        return count;
    }
}

Where this is the instance of singleton class.

These methods are accessed from main as well as worker threads via the singleton instance. Every method creates and closes it's own realm.

The code works without issues on the devices i'm testing on but I've received Crashlytics reports from some devices giving two fatal errors.

IllegalStateException: Realm objects can only be accessed on the thread they were created.

And

IllegalStateException: Realm instance can only be closed on the thread it was created.

What is wrong with this approach? Can provide more info if needed.

Upvotes: 0

Views: 326

Answers (1)

EpicPandaForce
EpicPandaForce

Reputation: 81539

Probably because you're setting the class variable to another Realm, and you have some fairly intricate multi-threading problem going on; nothing to do with device-specificness.

Solution: don't set the class level variable?

public long getPendingImagesCount() {
    try(Realm realm = Realm.getInstance(RealmUtils.getRealmConfiguration())) {
        return realm.where(PatientRecordImage.class).count();
    }
}

Upvotes: 1

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