public Sorter(SortOptimisations optimisations,
IComparer <TObject> comparer = null,
int resetThreshold = -1)
{
_optimisations = optimisations;
_resetThreshold = resetThreshold;
_updater = new IntermediateUpdater <TObject, TKey>(_cache);
_comparer = new KeyValueComparer <TObject, TKey>(comparer);
}
public DynamicCombiner([NotNull] IObservableList <IObservable <IChangeSet <TObject, TKey> > > source, CombineOperator type)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
_source = source;
_type = type;
_updater = new IntermediateUpdater <TObject, TKey>(_resultCache);
}
public void Initialise()
{
_cache = new Cache<Person, String>();
_updater = new IntermediateUpdater<Person, string>(_cache);
}
private IChangeSet <TObject, TKey> UpdateCombined(IChangeSet <TObject, TKey> updates)
{
//child caches have been updated before we reached this point.
var updater = new IntermediateUpdater <TObject, TKey>(_combinedCache);
foreach (var update in updates)
{
TKey key = update.Key;
switch (update.Reason)
{
case ChangeReason.Add:
case ChangeReason.Update:
{
// get the current key.
//check whether the item should belong to the cache
Optional <TObject> cached = updater.Lookup(key);
bool contained = cached.HasValue;
bool match = MatchesConstraint(key);
if (match)
{
if (contained)
{
if (!ReferenceEquals(update.Current, cached.Value))
{
updater.AddOrUpdate(update.Current, key);
}
}
else
{
updater.AddOrUpdate(update.Current, key);
}
}
else
{
if (contained)
{
updater.Remove(key);
}
}
}
break;
case ChangeReason.Remove:
{
var cached = updater.Lookup(key);
var contained = cached.HasValue;
bool shouldBeIncluded = MatchesConstraint(key);
if (shouldBeIncluded)
{
var firstOne = _sourceCaches.Select(s => s.Lookup(key))
.SelectValues()
.First();
if (!cached.HasValue)
{
updater.AddOrUpdate(firstOne, key);
}
else if (!ReferenceEquals(firstOne, cached.Value))
{
updater.AddOrUpdate(firstOne, key);
}
}
else
{
if (contained)
{
updater.Remove(key);
}
}
}
break;
case ChangeReason.Evaluate:
{
updater.Evaluate(key);
}
break;
}
}
return(updater.AsChangeSet());
// }
// return up
}
public void Initialise()
{
_cache = new Cache <Person, String>();
_updater = new IntermediateUpdater <Person, string>(_cache);
}
