/// <summary>
/// Handle a new find request, and manage the lifetime of this additional find request.
/// </summary>
private async void HandleFindRequest(FindEntry findEntry, CancellationToken cancellationToken)
{
Debug.Assert(_appContext == SynchronizationContext.Current, "HandleFind must be called on the main Unity app thread.");
findEntry.Count++;
// If the first find request, kick of internal search for the anchor
if (findEntry.Count == 1)
{
TryWatching();
// Notify listeners of the count change
ActiveSearchesCountChanged?.Invoke(this, new AnchoringServiceSearchingArgs(_pendingFinds.Count));
}
Task findTask;
if (_defaultProfile.SearchTimeout >= 0)
{
findTask = Task.WhenAny(findEntry.TaskCompletionSource.Task, Task.Delay(TimeSpan.FromSeconds(_defaultProfile.SearchTimeout)));
}
else
{
findTask = findEntry.TaskCompletionSource.Task;
}
try
{
await findTask.WithCancellation(cancellationToken);
LogVerbose("Found anchor. (anchor id: {0})", findEntry.AnchorId);
}
catch (TaskCanceledException)
{
LogVerbose("Find was canceled. (anchor id: {0})", findEntry.AnchorId);
}
catch (Exception)
{
// ignore other failures.
}
// If nothing is wanting to find this anchor id, remove it from the searches.
if (--findEntry.Count == 0 && _pendingFinds.Remove(findEntry.AnchorId))
{
LogVerbose("No more find requests for this anchor. (anchor id: {0})", findEntry.AnchorId);
// If search hasn't completed, notify task listeners of the cancelation.
findEntry.TaskCompletionSource?.TrySetCanceled();
// In order for this anchor id search to stop, we have to restart all searches.
TryWatching();
// Notify listeners of the count change
ActiveSearchesCountChanged?.Invoke(this, new AnchoringServiceSearchingArgs(_pendingFinds.Count));
}
else
{
LogVerbose("There are still active find requests for this anchor. (anchor id: {0}) (requests: {1})", findEntry.AnchorId, findEntry.Count);
}
}
/// <summary>
/// Start finding cloud spatial anchor, once found returned task is compelted.
/// </summary>
public Task <CloudSpatialAnchor> Find(string cloudSpatialAnchorId, CancellationToken cancellationToken)
{
LogVerbose("Find(string) called. (anchor id: {0})", cloudSpatialAnchorId);
FindEntry findEntry;
if (!_pendingFinds.TryGetValue(cloudSpatialAnchorId, out findEntry))
{
_pendingFinds[cloudSpatialAnchorId] = findEntry = new FindEntry(cloudSpatialAnchorId);
}
HandleFindRequest(findEntry, cancellationToken);
return(findEntry.TaskCompletionSource.Task);
}
public static void OnFindEntry(LogEntryEventArgs e)
{
FindEntry?.Invoke(null, e);
}
