public async Task <IEnumerable <UserInfo> > GetProjectLikersSequenceAsync(string projectId, DataQueryOptions filter)
{
var result = new List <UserInfo>();
IEnumerable <DomainItemSignal> data = await _cassandraStatisticsService.GetItemLikesSequenceAsync(StatisticsSpaces.Projects, projectId, MemoryPageSize);
var pageData = new List <DomainItemSignal>();
int count = 0;
int skip = filter != null && filter.Skip.HasValue ? filter.Skip.Value : 0;
foreach (DomainItemSignal user in data)
{
if (result.Count >= MemoryPageSize || count > MemoryPageSize * MaxScanPages)
{
// memory limit reached
break;
}
if (filter != null && filter.Take.HasValue && result.Count >= filter.Take.Value + skip)
{
// all items loaded
break;
}
// adding to page
pageData.Add(user);
// checking limits
if ((count > 0 && count % MemoryPageSize == 0) ||
(filter != null && filter.Take.HasValue && pageData.Count >= filter.Take.Value))
{
// loading and filtering items
List <UserInfo> page = await LoadUserPageDataAsync(pageData);
result.AddRange(page);
pageData.Clear();
}
count++;
}
if (pageData.Count > 0)
{
// loading last page
List <UserInfo> page = await LoadUserPageDataAsync(pageData);
result.AddRange(page);
pageData.Clear();
}
// Skip
result = result.Skip(skip).ToList();
// Take
if (filter != null && filter.Take.HasValue)
{
result = result.Take(filter.Take.Value).ToList();
}
return(result);
}
