topic Re: Compose, Object Already Owned in Kotlin Maps SDK Questions

Compose, Object Already Owned

LeighWoolley — Thu, 21 Dec 2023 22:34:50 GMT

Hi, I'm trying to toggle between a Scene and Map using compose. I want to display the same Geodatabase feature table on the Scene or Map (2d) when displayed. However on creating the feature layer I receive the Object already owned exception and I can't seem to free the table from the existing layers.

private suspend fun loadMobileScenePackage(tables: List<GeodatabaseFeatureTable>) {


    // Load the Mil Symbols TODO: move to track manager
    val dictionarySymbolStyle = DictionarySymbolStyle.createFromFile(styleFile)

    // Load the symbols
    dictionarySymbolStyle.load().onFailure { error ->
        Log.e("Mapping", error.cause.toString() + ": " + styleFile)
    }

    mobileScenePackage.load().onSuccess {
        // update the mutable state holder with the first scene from the MobileScenePackage
        val scene = mobileScenePackage.scenes.first()

        // Setup the scene with the renderer and geodb features

        tables.forEach { ft ->
            ...
            ft.load().onFailure { error ->
                Log.e("SVC", error.cause.toString())
            }
            val featureLayer = FeatureLayer.createWithFeatureTable(ft)
            featureLayer.load().onFailure { error ->
                Log.e("SVC", error.cause.toString())
            }
            scene.operationalLayers.add(featureLayer)
            ...
        }
        _firstScene.update { scene }
    }.onFailure { error ->
      ...
  }

@Composable
fun createSceneViewInstance(lifecycleOwner: LifecycleOwner, sceneViewModel: SceneViewModel = hiltViewModel()): SceneView {
    val sceneView = SceneView(LocalContext.current)
    DisposableEffect(lifecycleOwner) {
        lifecycleOwner.lifecycle.addObserver(sceneView)
        onDispose {
            lifecycleOwner.lifecycle.removeObserver(sceneView)
            sceneView.onDestroy(lifecycleOwner)
        }
    }
    return sceneView
}

Re: Compose, Object Already Owned

RamaChintapalli — Thu, 28 Dec 2023 22:26:47 GMT

Hi,
If you have already instantiated a FeatureLayer with a feature table, that feature table cannot be used by another instance of Feature layer, that's when you will receive Object Already Owned exception. You can always create a new instance.

Thanks
Rama

Re: Compose, Object Already Owned

LeighWoolley — Fri, 29 Dec 2023 00:07:29 GMT

Thanks is there a correct method to destroy the feature layer or remove it from a Scene?

Re: Compose, Object Already Owned

RamaChintapalli — Fri, 29 Dec 2023 00:19:39 GMT

You can remove the featurelayer from the operational layers list of the geomodel (i.e map or scene) to be able to use the same instance of feature layer

Re: Compose, Object Already Owned

dev4567 — Sat, 10 Feb 2024 16:44:51 GMT

Actually, the same issue with the Basemap -> one have to re-create Basemap from scratch or call Basemap.clone(). We need a better mechanism to release basemap from MapView