public async Task <IReadOnlyCollection <ObjectInfo> > GetOrdered(string?fromName, CancellationToken cancellationToken)
{
var retries = _retries;
while (true)
{
try
{
return(await _inner.GetOrdered(fromName, cancellationToken));
}
catch (OperationCanceledException)
{
throw;
}
catch (TimeoutException)
{
}
#pragma warning disable CA1031 // Do not catch general exception types -- dumb retry mechanism
catch when(retries-- > 0)
#pragma warning restore CA1031 // Do not catch general exception types
{
}
await Task.Delay(1511, cancellationToken);
}
}
public async Task Populate(CancellationToken cancellationToken)
{
if (_infos is null)
{
return;
}
ObjectInfo?lastInfo = _infos.LastOrDefault();
_infos.RemoveRange(0, _skip);
_skip = 0;
if (_infos.Count >= MaxListLength)
{
return;
}
var task = Interlocked.Exchange(ref _nextTask, null)
?? _source.GetOrdered(LastName, cancellationToken);
var newInfos = await task;
var index = 0;
foreach (var info in newInfos)
{
if (info.CompareTo(lastInfo) <= 0)
{
throw new InvalidDataException(FormattableString.Invariant(
$"Current object info {info} at index {index} is not sorted wrt {lastInfo}, last name \"{LastName}\", source {_source}."));
}
_infos.Add(info);
lastInfo = info;
++index;
}
var count = _infos.Count;
if (count == 0)
{
_infos = null;
LastName = null;
_nextTask = null;
return;
}
LastName = _infos[count - 1].Name;
_nextTask = _source.GetOrdered(LastName, cancellationToken);
}
public async Task <IReadOnlyCollection <ObjectInfo> > GetOrdered(string?fromName, CancellationToken cancellationToken)
{
var lockTask = _locker.Lock(cancellationToken);
var getTask = _source.GetOrdered(fromName, cancellationToken);
await Task.WhenAll(lockTask, getTask);
return(getTask.Result);
}
public async Task <IReadOnlyCollection <ObjectInfo> > GetOrdered(string?fromName, CancellationToken cancellationToken)
{
IReadOnlyCollection <ObjectInfo> result;
try
{
result = await _inner.GetOrdered(fromName, cancellationToken);
}
catch (OperationCanceledException)
{
throw;
}
catch
{
_writer.Add(_prefix + "get_errors", 1);
throw;
}
_writer.Add(_prefix + "gets", 1);
_writer.Add(_prefix + "objects", result.Count);
return(result);
}
public Task <IReadOnlyCollection <ObjectInfo> > GetOrdered(string?fromName, CancellationToken cancellationToken) => _source.GetOrdered(fromName, cancellationToken);
