public DataLoaderResolver(Func <TSource, TKey> keySelector, FetchDelegate <TKey, TReturn> fetchDelegate)
{
_keySelector = keySelector;
_captureFieldContext = false;
_loaderContext = new DataLoaderContext();
_loader = new DataLoader <TKey, TReturn>(fetchDelegate, _loaderContext);
}
// Fetch an object from backing store if not cached, serve from
// cache if it is.
//
public virtual Object Get(string index, FetchDelegate fetch)
{
CacheItemBase item = GetItem(index);
if (item != null)
{
return(item.Retrieve());
}
Object data = fetch(index);
if (data == null)
{
if ((m_Flags & CacheFlags.CacheMissing) != 0)
{
lock (m_Index)
{
CacheItemBase missing = new CacheItemBase(index);
if (!m_Index.Contains(missing))
{
m_Index.Add(missing);
m_Lookup[index] = missing;
}
}
}
return(null);
}
Store(index, data);
return(data);
}
// Fetch an object from backing store if not cached, serve from
// cache if it is.
//
public virtual Object Get(string index, FetchDelegate fetch)
{
Object item = Get(index);
if (item != null)
{
return(item);
}
Object data = fetch(index);
if (data == null)
{
if ((m_Flags & CacheFlags.CacheMissing) != 0)
{
m_IndexRwLock.AcquireWriterLock(-1);
try
{
CacheItemBase missing = new CacheItemBase(index);
if (!m_Index.Contains(missing))
{
m_Index.Add(missing);
m_Lookup[index] = missing;
}
}
finally
{
m_IndexRwLock.ReleaseWriterLock();
}
}
return(null);
}
Store(index, data);
return(data);
}
public MovieAwardsWon FetchMovieAwardsWon(int productionId)
{
var d = new FetchDelegate(productionId);
return(executor.ExecuteReader(d));
}
public Oscars FetchOscars(int OscarId)
{
var d = new FetchDelegate(OscarId);
return(executor.ExecuteReader(d));
}
public static IDataLoader <int, TReturn> GetDataLoader <TSource, TReturn>(this ResolveFieldContext <TSource> context, FetchDelegate <int, TReturn> fetchDelegate)
{
return(context.GetUserContext().LoadContext.GetLoader <int, TReturn>(context.FieldDefinition, fetchDelegate));
}
/// <summary>
/// Configures a field to use a <see cref="DataLoaderResolver"/> to resolve batches.
/// </summary>
public static FieldBuilder <TSource, IEnumerable <TReturn> > BatchResolve <TSource, TKey, TReturn>(this FieldBuilder <TSource, object> fieldBuilder, Func <TSource, TKey> keySelector, FetchDelegate <TKey, TReturn> fetchDelegate)
{
return(fieldBuilder
.Returns <IEnumerable <TReturn> >()
.Resolve(new DataLoaderResolver <TSource, TKey, TReturn>(keySelector, fetchDelegate)));
}
public Sales FetchSales(int productionId)
{
var d = new FetchDelegate(productionId);
return(executor.ExecuteReader(d));
}
public Person FetchPerson(int personId)
{
var d = new FetchDelegate(personId);
return(executor.ExecuteReader(d));
}
public IndividualAwardsWon FetchIndividualAwardsWon(int productionId)
{
var d = new FetchDelegate(productionId);
return(executor.ExecuteReader(d));
}
public ProductionHouse FetchProductionHouse(int productionId)
{
var d = new FetchDelegate(productionId);
return(executor.ExecuteReader(d));
}