//Handles _SessionManager.IncomingRoster
private void OnIncomingRosterChange(RosterChange incomingRosterChange)
{
//work performed in here should be done on the main GUI thread
//since it will be updating the treeview
this.BeginInvoke(new Session.PacketReceivedDelegate(IncomingRosterChangeThreadSafe), new object[] { incomingRosterChange });
}
public async Task <Microsoft.FSharp.Collections.FSharpList <Tuple <RosterChange, string> > > ChangesSince(string value)
{
using (var context = CreateContext()) {
var lastVersion = int.Parse(value);
var latestChanges =
/*
* // Not working in MySql
* from change in context.RosterChanges
* where change.ApplicationUserId == user.Id
* where change.Version > lastVersion
* group change by change.Jid into g
* let latest =
* (from item in g
* orderby item.Version descending
* select item)
* .FirstOrDefault()
* orderby latest.Version
* select latest;
*
* // Not working in MySql
* context.RosterChanges
* .Where (c => c.ApplicationUserId == user.Id && c.Version > lastVersion)
* .GroupBy (c => c.Jid)
* .Select (g => g.OrderByDescending(i => i.Version).FirstOrDefault())
* .OrderBy(i => i.Version); */
from change in context.RosterChanges
join gro in
(from c in context.RosterChanges
group c by c.Jid into g
select new { Name = g.Key, MaxVer = g.Select(i => i.Version).Max() })
on change.Jid equals gro.Name
where change.ApplicationUserId == user &&
change.Version > lastVersion &&
change.Version == gro.MaxVer
orderby change.Version
select change;
var list = new List <Tuple <RosterChange, string> > ();
foreach (var item in await latestChanges.ToListAsync())
{
// build list
RosterChange change = null;
switch (item.ChangeType)
{
case DbChangeType.Set:
var items =
await(from i in context.RosterItems
where i.ApplicationUserId == user
where i.Jid == item.Jid
select i)
.FirstOrDefaultAsync();
change = RosterChange.NewSetItem(items.ToFSharp());
break;
case DbChangeType.Delete:
change = RosterChange.NewDeleteItem(JabberId.Parse(item.Jid));
break;
default:
throw new InvalidOperationException("Invalid ChangeType");
}
var t = Tuple.Create(change, VersionString(item.Version));
list.Add(t);
}
return(ListModule.OfSeq(list));
//return null;
}
}
