private async ValueTask <List <object?> > CreateStreamResultAsync(
StreamDirective streamDirective)
{
IAsyncEnumerable <object?> enumerable = Selection.CreateStream(ResolverContext.Result !);
IAsyncEnumerator <object?> enumerator = enumerable.GetAsyncEnumerator();
var next = true;
try
{
var list = new List <object?>();
var initialCount = streamDirective.InitialCount;
var count = 0;
if (initialCount > 0)
{
while (next)
{
count++;
next = await enumerator.MoveNextAsync().ConfigureAwait(false);
list.Add(enumerator.Current);
if (count >= initialCount)
{
break;
}
}
}
if (next)
{
// if the stream has more items than the initial requested items then we will
// defer the rest of the stream.
OperationContext.Scheduler.DeferredWork.Register(
new DeferredStream(
Selection,
streamDirective.Label,
ResolverContext.Path,
ResolverContext.Parent <object>(),
count - 1,
enumerator,
ResolverContext.ScopedContextData));
}
return(list);
}
finally
{
if (!next)
{
// if there is no deferred work we will just dispose the enumerator.
// in the case we have deferred work, the deferred stream handler is
// responsible of handling the dispose.
await enumerator.DisposeAsync().ConfigureAwait(false);
}
}
}