public (DataPage <TPrimaryKey, TRow> NewValue, IMaybe <TRow> PreviousValue) Upsert(
TPrimaryKey key,
Func <TRow> factoryFunction,
Func <TRow, TRow> updateFunction,
Action <TRow> onBeforeUpsert)
{
var previous = Maybe.Empty <TRow>();
var newValue = _map.AddOrReplace(key,
() =>
{
var toInsert = factoryFunction();
onBeforeUpsert?.Invoke(toInsert);
return(new DataPage <TPrimaryKey, TRow>(key, toInsert));
},
p =>
{
previous = Maybe.Return(p.Row);
var toUpdate = updateFunction(previous.Value);
onBeforeUpsert?.Invoke(toUpdate);
p.Update(toUpdate);
return(p);
});
return(newValue, previous);
}
public void Add(TIndexKey key, DataPage <TPrimaryKey, TRow> page)
{
_map.AddOrReplace(key,
() =>
{
var group = new Set <DataPage <TPrimaryKey, TRow> >(_primaryKeyComparer);
group.Add(page);
return(group);
},
s =>
{
if (!s.Add(page))
{
throw new Exception($"Unable to add record to group at key: '{key}'. Row with primary key '{page.PrimaryKey}' already existed in the group");
}
return(s);
});
}
