private static void OnThumbnailStepProcessed(ThumbnailCompilerContext context, AssetItem assetItem, string thumbnailStorageUrl, BuildStepEventArgs buildStepEventArgs)
{
// returns immediately if the user has not subscribe to the event
if (!context.ShouldNotifyThumbnailBuilt)
{
return;
}
// TODO: the way to get last build step (which should be thumbnail, not its dependencies) should be done differently, at the compiler level
// (we need to generate two build step that can be accessed directly, one for dependency and one for thumbnail)
var lastBuildStep = buildStepEventArgs.Step is ListBuildStep ? ((ListBuildStep)buildStepEventArgs.Step).Steps.LastOrDefault() ?? buildStepEventArgs.Step : buildStepEventArgs.Step;
// Retrieving build result
var result = ThumbnailBuildResult.Failed;
if (lastBuildStep.Succeeded)
{
result = ThumbnailBuildResult.Succeeded;
}
else if (lastBuildStep.Status == ResultStatus.Cancelled)
{
result = ThumbnailBuildResult.Cancelled;
}
// TODO: Display error logo if anything else went wrong?
var changed = lastBuildStep.Status != ResultStatus.NotTriggeredWasSuccessful;
// Open the image data stream if the build succeeded
Stream thumbnailStream = null;
ObjectId thumbnailHash = ObjectId.Empty;
if (lastBuildStep.Succeeded)
{
thumbnailStream = MicrothreadLocalDatabases.DatabaseFileProvider.OpenStream(thumbnailStorageUrl, VirtualFileMode.Open, VirtualFileAccess.Read);
thumbnailHash = MicrothreadLocalDatabases.DatabaseFileProvider.ContentIndexMap[thumbnailStorageUrl];
}
try
{
context.NotifyThumbnailBuilt(assetItem, result, changed, thumbnailStream, thumbnailHash);
}
finally
{
// Close the image data stream if opened
if (thumbnailStream != null)
{
thumbnailStream.Dispose();
}
}
}
