/// <inheritdoc />
public async Task <IPrefabContentResourceHandle> LoadAvatarPrefabAsync(long avatarId)
{
//If it's already available, we can just return immediately
if (IsAvatarResourceAvailable(avatarId))
{
return(TryLoadAvatarPrefab(avatarId));
}
ContentDownloadURLResponse downloadUrlResponse = await ContentClient.RequestAvatarDownloadUrl(avatarId, AuthTokenRepo.RetrieveWithType())
.ConfigureAwait(false);
//TODO: Handle failure
TaskCompletionSource <IPrefabContentResourceHandle> completionSource = new TaskCompletionSource <IPrefabContentResourceHandle>();
//Asset bundle requests can sadly only happen on the main thread, so we must join the main thread.
await new UnityYieldAwaitable();
//TODO: We should handle caching, versioning and etc here.
UnityWebRequestAsyncOperation asyncOperation = UnityWebRequestAssetBundle.GetAssetBundle(downloadUrlResponse.DownloadURL, 0).SendWebRequest();
//TODO: We should render these operations to the loading screen UI.
asyncOperation.completed += operation =>
{
//When we first get back on the main thread, the main concern
//is that this resource manager may be from the last scene
//and that the client may have moved on
//to avoid this issues we check disposal state
//and do nothing, otherwise if we check AFTER then we just have to release the assetbundle immediately anyway.
if (isDisposed)
{
//Just tell anyone awaiting this that it is canceled. They should handle that case, not us.
completionSource.SetCanceled();
return;
}
//GetContent will throw if the assetbundle has already been loaded.
//So to prevent this from occuring due to multiple requests for the
//content async we will check, on this main thread, via a write lock.
lock (SyncObj)
{
//We're on the main thread again. So, we should check if another
//request already got the bundle
if (IsAvatarResourceAvailable(avatarId))
{
completionSource.SetResult(TryLoadAvatarPrefab(avatarId));
return;
}
//otherwise, we still don't have it so we should initialize it.
this.ResourceHandleCache[avatarId] = new ReferenceCountedPrefabContentResourceHandle(DownloadHandlerAssetBundle.GetContent(asyncOperation.webRequest));
completionSource.SetResult(TryLoadAvatarPrefab(avatarId)); //we assume this will work now.
}
};
return(await completionSource.Task
.ConfigureAwait(false));
}