protected override Task <ListStreamsPage> ListStreamsInternal(
Pattern pattern,
int maxCount,
string continuationToken,
ListNextStreamsPage listNextStreamsPage,
CancellationToken cancellationToken)
{
Ensure.That(listNextStreamsPage).IsNotNull();
int.TryParse(continuationToken, out var index);
Func <string, bool> filter = default;
switch (pattern)
{
case Pattern.Any _:
filter = s => true;
break;
case Pattern.StartingWith p:
filter = s => s?.StartsWith(p.Value) ?? false;
break;
case Pattern.EndingWith p:
filter = s => s?.EndsWith(p.Value) ?? false;
break;
default:
throw Pattern.Unrecognized(nameof(pattern));
}
using (_lock.UseReadLock())
{
var streamIds = _streamIds
.Skip(index)
.Where(filter)
.Take(maxCount)
.ToArray();
var nextContinuationToken = streamIds.Length == 0
? 0
: _streamIds.IndexOf(streamIds[streamIds.Length - 1]) + 1;
return(Task.FromResult(new ListStreamsPage(
nextContinuationToken.ToString(),
streamIds,
listNextStreamsPage)));
}
}
protected override async Task <ListStreamsPage> ListStreamsInternal(
Pattern pattern,
int maxCount,
string continuationToken,
ListNextStreamsPage listNextStreamsPage,
CancellationToken cancellationToken)
{
GuardAgainstDisposed();
cancellationToken.ThrowIfCancellationRequested();
using (var connection = OpenConnection())
{
var headers = await connection.AllStream()
.List(pattern, maxCount, continuationToken, cancellationToken);
var token = headers.Any()
? headers.Last().Key.ToString()
: Position.End.ToString();
return(new ListStreamsPage(token,
headers.Select(h => h.IdOriginal).ToArray(),
listNextStreamsPage));
}
}
protected abstract Task <ListStreamsPage> ListStreamsInternal(
Pattern pattern,
int maxCount,
string continuationToken,
ListNextStreamsPage listNextStreamsPage,
CancellationToken cancellationToken);
