public async Task <IEnumerable <T> > GetAsync <T>(IEnumerable <int> ids) where T : class
{
// Auto-flush
await CommitAsync(keepTracked : true);
var result = new List <T>();
if (ids == null || !ids.Any())
{
return(result);
}
// Are all the objects already in cache?
IEnumerable <object> cached = ids.Select(id =>
{
object entity;
if (_identityMap.TryGetEntityById(id, out entity))
{
return(entity);
}
return(null);
});
if (!cached.Any(x => x == null))
{
foreach (T item in cached)
{
result.Add(item);
}
}
// Some documents might not be in cache, load all of them from storage, then resolve local maps
var items = (await _storage.GetAsync <T>(ids.ToArray())).ToArray();
// if the document has an Id property, set it back
var accessor = _store.GetIdAccessor(typeof(T), "Id");
for (int i = 0; i < items.Length; i++)
{
var item = items[i];
var id = ids.ElementAt(i);
object entity;
if (_identityMap.TryGetEntityById(id, out entity))
{
result.Add((T)entity);
}
else
{
if (accessor != null)
{
accessor.Set(item, id);
}
// track the loaded object
_identityMap.Add(id, item);
result.Add(item);
}
}
return(result);
}
