/// <summary>
/// Checks each actor for expiration and purges if allowed.
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
async Task PurgeActorsAsync(CancellationToken cancellationToken)
{
logger.Information("Running state actor purge.");
var more = (ContinuationToken)null;
var keep = 0;
var remv = 0;
do
{
// get a page of actors
var page = await StateProvider.GetActorsAsync(128, more, cancellationToken);
more = page.ContinuationToken;
// potentially purge actors
foreach (var actorId in page.Items)
{
if (await TryPurgeActorAsync(actorId, cancellationToken))
{
remv++;
}
else
{
keep++;
}
}
}while (more != null && cancellationToken.IsCancellationRequested == false);
// report count of known active actors
logger.Information("Removed {RemovedCount} actors during purge, kept {KeepCount} actors.", remv, keep);
Partition.ReportLoad(new[] { new LoadMetric("AspNetStateService.ActiveSessionCount", keep) });
}
public async Task <IEnumerable <int> > GetCountsAsync(CancellationToken cancellationToken)
{
ContinuationToken continuationToken = null;
var result = new List <int>();
do
{
var page = await StateProvider.GetActorsAsync(10000, continuationToken, cancellationToken);
foreach (var actorId in page.Items)
{
var state = await StateProvider.LoadStateAsync <int>(
actorId : actorId,
stateName : "count",
cancellationToken : cancellationToken);
result.Add(state);
}
continuationToken = page.ContinuationToken;
} while (continuationToken != null);
return(result);
}
public async Task <IEnumerable <Student> > GetStudentsAsync(CancellationToken cancellationToken)
{
var ids = new List <Guid>();
ContinuationToken continuationToken = null;
do
{
var page = await StateProvider.GetActorsAsync(int.MaxValue, continuationToken, cancellationToken);
ids.AddRange(page.Items.Select(actorId => actorId.GetGuidId()));
continuationToken = page.ContinuationToken;
} while (continuationToken != null);
var tasks = ids.Select(id => GetStudentAsync(id, cancellationToken));
return(await Task.WhenAll(tasks));
}
//To test performance of paging.
public async Task <IEnumerable <Guid> > GetAllGuids(int numItemsToReturn, CancellationToken cancellationToken)
{
ContinuationToken continuationToken = null;
var ids = new List <Guid>();
do
{
var page = await
StateProvider.GetActorsAsync(numItemsToReturn, continuationToken, cancellationToken);
foreach (var actorId in page.Items)
{
ids.Add(actorId.GetGuidId());
}
continuationToken = page.ContinuationToken;
} while (continuationToken != null);
return(ids);
}
protected override async Task RunAsync(CancellationToken cancellationToken)
{
await base.RunAsync(cancellationToken);
if (cancellationToken.CanBeCanceled)
{
cancellationToken.ThrowIfCancellationRequested();
}
ContinuationToken continuationToken = null;
do
{
var page = await StateProvider.GetActorsAsync(int.MaxValue, continuationToken, cancellationToken);
foreach (var actorId in page.Items)
{
_cache.AddOrUpdate(actorId.GetGuidId(), new object(), (id, o) => o);
}
continuationToken = page.ContinuationToken;
} while (continuationToken != null);
}
