public virtual int PrefetchProductVariantAttributes(IEnumerable <string> attributesXml)
{
if (attributesXml == null || !attributesXml.Any())
{
return(0);
}
// Determine uncached attributes
var unfetched = attributesXml
.Where(xml => xml.HasValue())
.Distinct()
.Where(xml => !_requestCache.Contains(ATTRIBUTEVALUES_BY_XML_KEY.FormatInvariant(xml)))
.ToArray();
var infos = new List <AttributeMapInfo>(unfetched.Length);
foreach (var xml in unfetched)
{
var valueIds = new HashSet <int>();
var map = DeserializeProductVariantAttributes(xml);
var attributes = _productAttributeService.GetProductVariantAttributesByIds(map.Keys);
foreach (var attribute in attributes)
{
// Only types that have attribute values! Otherwise entered text is misinterpreted as an attribute value id.
if (!attribute.ShouldHaveValues())
{
continue;
}
var ids =
from id in map[attribute.Id]
where id.HasValue()
select id.ToInt();
valueIds.UnionWith(ids);
}
var info = new AttributeMapInfo
{
AttributesXml = xml,
DeserializedMap = map,
AllValueIds = valueIds.ToArray()
};
infos.Add(info);
}
// Get all value ids across all maps (each map has many attributes)
var allValueIds = infos.SelectMany(x => x.AllValueIds)
.Distinct()
.ToArray();
// Load ALL requested attribute values into a single dictionary in one go (key is Id)
var attributeValues = _productAttributeService.GetProductVariantAttributeValuesByIds(allValueIds).ToDictionarySafe(x => x.Id);
// Create a single cache entry for each passed xml
foreach (var info in infos)
{
var cachedValues = new List <ProductVariantAttributeValue>();
// Ensure value id order in cached result list is correct
foreach (var id in info.AllValueIds)
{
if (attributeValues.TryGetValue(id, out var value))
{
cachedValues.Add(value);
}
}
// Put it in cache
var cacheKey = ATTRIBUTEVALUES_BY_XML_KEY.FormatInvariant(info.AttributesXml);
_requestCache.Put(cacheKey, cachedValues);
}
return(unfetched.Length);
}
