public IEnumerable <TEntity> GetEntitiesByParent(string parentType, string parentId, EntityLookupRoot lookupRoot)
{
List <TEntity> cachedEntities = new List <TEntity>();
List <string> missingEntityIds = new List <string>();
var references = _snapshotStore.GetChildSnapshotReferences <TSnapshot>(parentType, parentId).ToList();
if (references.Count == 0)
{
return(Enumerable.Empty <TEntity>());
}
foreach (var reference in references)
{
if (lookupRoot.TryGetValue(reference, out TEntity entity))
{
cachedEntities.Add(entity);
}
else
{
missingEntityIds.Add(reference.EntityID);
}
}
List <TEntity> missingEntiies = new List <TEntity>();
var snapshots = _snapshotStore.GetSnapshots <TSnapshot>(missingEntityIds).ToList();
var subEntitySnapshots = GetSubEntitySnapshotLookup(snapshots);
foreach (var snapshot in snapshots)
{
if (subEntitySnapshots == null)
{
TEntity entity = LoadEntityFromSnapshot(snapshot, null);
entity.LookupRoot = lookupRoot;
lookupRoot.Add(entity);
missingEntiies.Add(entity);
}
else
{
EntityReference snapshotReference = new EntityReference(typeof(TEntity).Name, snapshot.EntityID);
List <EntitySnapshot> subEntities = null;
if (!subEntitySnapshots.TryGetValue(snapshotReference, out subEntities))
{
subEntities = new List <EntitySnapshot>();
}
TEntity entity = LoadEntityFromSnapshot(snapshot, subEntities);
entity.LookupRoot = lookupRoot;
lookupRoot.Add(entity);
missingEntiies.Add(entity);
}
}
return(cachedEntities.Concat(missingEntiies));
}