protected override async Task <Lease <T> > AcquireLease()
{
var resource = leasables
.Where(l => l.LeaseLastReleased + waitInterval < DateTimeOffset.UtcNow)
.OrderBy(l => l.LeaseLastReleased)
.FirstOrDefault(l => !workInProgress.ContainsKey(l));
if (resource == null)
{
return(null);
}
var lease = new Lease <T>(resource, defaultLeaseDuration);
if (workInProgress.TryAdd(resource, lease))
{
lease.NotifyGranted();
return(lease);
}
return(null);
}