internal ChunkHeader ReadChunkHeader(string url)
{
if (!FileProvider.FileExists(url))
{
HandleAssetNotFound(url);
return(null);
}
using (var stream = FileProvider.OpenStream(url, VirtualFileMode.Open, VirtualFileAccess.Read))
{
// File does not exist
// TODO/Benlitz: Add a log entry for that, it's not expected to happen
if (stream == null)
{
return(null);
}
// Read header
var streamReader = new BinarySerializationReader(stream);
return(ChunkHeader.Read(streamReader));
}
}
private object DeserializeObject(Queue <DeserializeOperation> serializeOperations, Reference parentReference, string url, Type objType, object obj, ContentManagerLoaderSettings settings)
{
// Try to find already loaded object
Reference reference = FindDeserializedObject(url, objType);
if (reference != null && reference.Deserialized)
{
// Add reference
bool isRoot = parentReference == null;
if (isRoot || parentReference.References.Add(reference))
{
IncrementReference(reference, isRoot);
}
// Check if need to fully stream resource
if (!settings.AllowContentStreaming)
{
var streamingManager = services.GetService <IStreamingManager>();
streamingManager?.FullyLoadResource(reference.Object);
}
return(reference.Object);
}
if (!FileProvider.FileExists(url))
{
HandleAssetNotFound(url);
return(null);
}
ContentSerializerContext contentSerializerContext;
object result;
// Open asset binary stream
try
{
using (var stream = FileProvider.OpenStream(url, VirtualFileMode.Open, VirtualFileAccess.Read))
{
// File does not exist
// TODO/Benlitz: Add a log entry for that, it's not expected to happen
if (stream == null)
{
return(null);
}
Type headerObjType = null;
// Read header
var streamReader = new BinarySerializationReader(stream);
var chunkHeader = ChunkHeader.Read(streamReader);
if (chunkHeader != null)
{
headerObjType = AssemblyRegistry.GetType(chunkHeader.Type);
}
// Find serializer
var serializer = Serializer.GetSerializer(headerObjType, objType);
if (serializer == null)
{
throw new InvalidOperationException($"Content serializer for {headerObjType}/{objType} could not be found.");
}
contentSerializerContext = new ContentSerializerContext(url, ArchiveMode.Deserialize, this)
{
LoadContentReferences = settings.LoadContentReferences,
AllowContentStreaming = settings.AllowContentStreaming,
};
// Read chunk references
if (chunkHeader != null && chunkHeader.OffsetToReferences != -1)
{
// Seek to where references are stored and deserialize them
streamReader.NativeStream.Seek(chunkHeader.OffsetToReferences, SeekOrigin.Begin);
contentSerializerContext.SerializeReferences(streamReader);
streamReader.NativeStream.Seek(chunkHeader.OffsetToObject, SeekOrigin.Begin);
}
if (reference == null)
{
// Create Reference
reference = new Reference(url, parentReference == null);
result = obj ?? serializer.Construct(contentSerializerContext);
SetAssetObject(reference, result);
}
else
{
result = reference.Object;
}
reference.Deserialized = true;
PrepareSerializerContext(contentSerializerContext, streamReader.Context);
contentSerializerContext.SerializeContent(streamReader, serializer, result);
// Add reference
parentReference?.References.Add(reference);
}
}
catch (Exception exception)
{
throw new ContentManagerException($"Unexpected exception while loading asset [{url}]. Reason: {exception.Message}. Check inner-exception for details.", exception);
}
if (settings.LoadContentReferences)
{
// Process content references
// TODO: Should we work at ChunkReference level?
foreach (var contentReference in contentSerializerContext.ContentReferences)
{
bool shouldBeLoaded = true;
//Reference childReference;
settings.ContentFilter?.Invoke(contentReference, ref shouldBeLoaded);
if (shouldBeLoaded)
{
serializeOperations.Enqueue(new DeserializeOperation(reference, contentReference.Location, contentReference.Type, contentReference.ObjectValue));
}
}
}
return(result);
}