public void Add(Friend value)
{
var added = _db.Friends.Add(value);
_db.SaveChanges();
Clients.All.add(added);
}
public void Delete(Friend value)
{
var entity = _db.Friends.First<Friend>(f => f.Id == value.Id);
var removed = _db.Friends.Remove(entity);
_db.SaveChanges();
Clients.All.delete(removed);
}
public void Update(Friend value)
{
var updated = _db.Friends.First<Friend>(f => f.Id == value.Id);
updated.Name = value.Name;
_db.SaveChanges();
Clients.All.update(updated);
int removed;
_locks.TryRemove(Context.ConnectionId, out removed);
Clients.All.allLocks(_locks.Values);
}
public void TakeLock(Friend value)
{
// Race condition: N clients attempting to edit same row
lock (_lock)
{
foreach (int id in _locks.Values)
{
if (value.Id == id)
{
return;
}
}
_locks.AddOrUpdate(Context.ConnectionId, value.Id, (key, oldValue) => value.Id);
Clients.Caller.takeLockSuccess(value);
Clients.All.allLocks(_locks.Values);
}
}
