/// <summary>
/// Restores already executed indexing actity states to Waiting. The goal is to
/// mark old activities that cannot be found in the index to be executed again.
/// This should happen after a db and index restore, when the index is older than
/// the database. This method assumes that the latest activity id is written to the index.
/// </summary>
private static void RestoreIndexIfNeeded()
{
//TODO: review this method, because currently we do not write status to the service index. That means
// the last activity id will always be 0 in case of a centralized index and this method will never
// restore the status of indexing activities. This is a problem in case we restore an older index:
// newer activities will never be executed.
SnTrace.Index.Write("Reading IndexingActivityStatus from index:");
try
{
var status = IndexManager.IndexingEngine.ReadActivityStatusFromIndexAsync(CancellationToken.None)
.GetAwaiter().GetResult();
SnTrace.Index.Write($" Status: {status}");
if (status.LastActivityId > 0)
{
SnTrace.Index.Write(" Restore indexing activities: ");
var result = IndexManager.RestoreIndexingActivityStatusAsync(status, CancellationToken.None)
.ConfigureAwait(false).GetAwaiter().GetResult();
SnTrace.Index.Write($" Restore result: {result}.");
}
else
{
SnTrace.Index.Write(" Restore is not necessary.");
}
}
catch (Exception ex)
{
SnTrace.Index.Write($"WARNING: error when reading indexing activity status " +
$"from the centralized index or when restoring activity status: {ex.Message}");
}
}
