public static void WaitForIndexNotStale(this DocumentDatabase db, string indexName, DateTime?cutOff, Guid?cuttOfEtag, TimeSpan timeout, CancellationToken cancellationToken)
{
TimeSpan delayIncrement = TimeSpan.FromMilliseconds(50);
TimeSpan currentDelay = TimeSpan.FromMilliseconds(100);
DateTime initialTime = DateTime.UtcNow;
DateTime timeLimit = initialTime.Add(timeout);
while (db.IsIndexStale(indexName, cutOff, cuttOfEtag))
{
cancellationToken.ThrowIfCancellationRequested();
if (DateTime.UtcNow > timeLimit)
{
log.Error("WaitForIndexNotStale timed out after {0}", DateTime.UtcNow.Subtract(initialTime));
throw new TimeoutException("Timeout exceeded waiting for index not to be stale");
}
var delayTask = TaskExtensions.Delay(currentDelay, cancellationToken);
try
{
delayTask.Wait();
}
catch (Exception ex)
{
if (delayTask.IsCanceled)
{
log.Trace("WaitForIndexNotStale has been cancelled after {0}", DateTime.UtcNow.Subtract(initialTime));
throw new OperationCanceledException(cancellationToken);
}
else
{
log.ErrorException("WaitForIndexNotStale failed", ex);
throw;
}
}
currentDelay = currentDelay.Add(delayIncrement);
}
log.Debug("WaitForIndexNotStale completed in {0}", DateTime.UtcNow.Subtract(initialTime));
}
