kt

class RealmLock {
    private var _uiRealm: Realm? = null

    fun getRealm(runningFromTransaction: Boolean = false): Realm {
        return if (MainThread.isMainThread()) {
            if (_uiRealm == null) {
                _uiRealm = Realm.getDefaultInstance()
            }
            _uiRealm!!
        } else {
            if (!runningFromTransaction) {
                ExceptionThrower.trow("Getting realm instance on back thread must happen only from within transaction")
            }
            Realm.getDefaultInstance()
        }
    }

    fun transaction(block: (realm: Realm) -> Unit) {
        var realm: Realm? = null
        try {
            realm = this.getRealm(true)
            realm.executeTransaction {
                block(it)
            }
        } finally {
            if (!MainThread.isMainThread()) {
                realm?.close()
            }
        }
    }
}