private IConcurrentDocument <DashboardVersion> StartRestoringArchive(IConcurrentDocument <DashboardVersion> version)
{
const int IndexerPollIntervalMilliseconds = 5000;
_dashboardVersionManager.StartRestoringArchive(version.ETag);
PersistentQueueMessage message = _upgradeQueueReader.Dequeue();
int count = 0;
do
{
while (message != null)
{
version = _dashboardVersionManager.Read();
if (version.Document.UpgradeState != DashboardUpgradeState.RestoringArchive)
{
_upgradeQueueReader.TryMakeItemVisible(message);
return(version);
}
// Delete auto-"archives" from host-archive back to host-output.
_upgradeQueueReader.Delete(message);
message = _upgradeQueueReader.Dequeue();
}
version = _dashboardVersionManager.Read();
if (version.Document.UpgradeState != DashboardUpgradeState.RestoringArchive)
{
return(version);
}
// Get items left
// while limiting pagination to first page since we're only interested in
// knowing if we're out of items.
count = _upgradeQueueReader.Count(1);
if (count > 0)
{
// wait for a while before resuming
Thread.Sleep(IndexerPollIntervalMilliseconds);
}
}while (count > 0);
return(version);
}
