protected override IEnumerable <string> GetIdentifiersToRequest()
{
if (!_expressionInfo.FilterInfo.IdentifiersRangeFound)
{
return(null);
}
return(_expressionInfo.FilterInfo.Identifiers.Except(_savable.GetAllPendingChangesIdentifiers()));
}
protected override IEnumerable GetEntities(IEnumerable <string> identifiers)
{
var identifiersToRequest = identifiers.Except(_savable.GetAllPendingChangesIdentifiers());
var entities = GetEntitiesFromCache(identifiers);
return(_savable.CombineWithPendingChanges(entities, _predicate));
}
protected override IEnumerable GetEntities(IEnumerable <string> identifiers)
{
var identifiersToRequest = identifiers.Except(_savable.GetAllPendingChangesIdentifiers());
if (_expressionInfo.InnerMostExpression.Method.Name == nameof(Queryable.FirstOrDefault) ||
_expressionInfo.InnerMostExpression.Method.Name == nameof(Queryable.LastOrDefault))
// other methods like that
{
// do not care about order, so FirstOrDefault and LastOrDefault are the same
identifiersToRequest = identifiersToRequest.Take(1);
}
var entities = identifiersToRequest.Any() ? GetEntitiesFromDao(identifiersToRequest) : Enumerable.Empty <T>();
return(_savable.CombineWithPendingChanges(entities, _predicate));
}
protected override IEnumerable GetEntities(IEnumerable <string> identifiers)
{
var method = _expressionInfo.InnerMostExpression.Method;
if (!IsNonReplacableMethod(method))
{
return(_savable.CombineIdentifiersRangeWithPendingChanges(identifiers, _predicate));
}
// non - replacable methods, we need entities
var identifiersToRequest = identifiers.Except(_savable.GetAllPendingChangesIdentifiers());
// assume we can just get if from the cache directly for no other properties except key are used.
var entities = identifiersToRequest.Any() ? _cachedDataProvider.GetCachedEntities(identifiersToRequest) : Enumerable.Empty <T>();
//var entities = identifiersToRequest.Any() ? _cachedDataProvider.GetEntitiesBasedOnCache(identifiersToRequest) : Enumerable.Empty<T>();
return(_savable.CombineWithPendingChanges(entities, _predicate));
}
