public async Task Execute(IEnumerable <IComplexQueryEntity> entities, CancellationToken ct)
{
if (entities == null)
{
throw new ArgumentNullException(nameof(entities));
}
var grouping = entities.Where(e => !(e is null)).ToList().GroupBy(e => e.QueryRequestor);
foreach (var group in grouping)
{
// arrange
var query = new ComplexQuery(group.Key);
var result = new ComplexQueryResult(query);
// use cache
var cachedEntity = group.First() as IComplexQueryCachedEntity;
if (cachedEntity != null && cachedEntity.TryReadCache(out var cache))
{
result.AddRange(cache);
}
else
{
if (group.Key.RequestType == RequestType.PerType)
{
group.First().AdjustComplexQuery(query);
}
else
{
foreach (var entity in group)
{
entity.AdjustComplexQuery(query);
}
}
// fetch
foreach (var queryEntity in query)
{
result.AddRange(await _getListFactory(queryEntity, ct));
}
// save cache
cachedEntity?.SaveCache(result);
}
// utilize
foreach (var entity in group)
{
entity.UtilizeComplexQueryResult(result);
}
}
}
public ComplexQueryResult(ComplexQuery query) : this(query, Enumerable.Empty <Entity>())
{
}
public ComplexQueryResult(ComplexQuery query, IEnumerable <Entity> entities) : base(entities)
{
Query = query ?? throw new ArgumentNullException(nameof(query));
}
public ComplexQueryResult(ComplexQuery query, params Entity[] entities) : this(query, (IEnumerable <Entity>)entities)
{
}
