You're breathtaking!

Source/Engine/Streaming/StreamingGroup.cpp

@@ -0,0 +1,45 @@
+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#include "StreamingGroup.h"
+#include "Handlers/TexturesStreamingHandler.h"
+#include "Handlers/ModelsStreamingHandler.h"
+#include "Handlers/SkinnedModelsStreamingHandler.h"
+#include "Handlers/AudioStreamingHandler.h"
+
+StreamingGroup::StreamingGroup(Type type, IStreamingHandler* handler)
+    : _type(type)
+    , _handler(handler)
+{
+    ASSERT(_handler != nullptr);
+}
+
+StreamingGroups::StreamingGroups()
+    : _textures(nullptr)
+    , _models(nullptr)
+    , _skinnedModels(nullptr)
+    , _audio(nullptr)
+    , _groups(8)
+{
+    // Register in-build streaming groups
+    Add(_textures = New<StreamingGroup>(StreamingGroup::Type::Textures, New<TexturesStreamingHandler>()));
+    Add(_models = New<StreamingGroup>(StreamingGroup::Type::Models, New<ModelsStreamingHandler>()));
+    Add(_skinnedModels = New<StreamingGroup>(StreamingGroup::Type::Models, New<SkinnedModelsStreamingHandler>()));
+    Add(_audio = New<StreamingGroup>(StreamingGroup::Type::Audio, New<AudioStreamingHandler>()));
+}
+
+StreamingGroups::~StreamingGroups()
+{
+    // Cleanup
+    _groups.ClearDelete();
+    _handlers.ClearDelete();
+}
+
+void StreamingGroups::Add(StreamingGroup* group)
+{
+    ASSERT(group && !_groups.Contains(group));
+
+    // Register group and it's handler
+    _groups.Add(group);
+    if (!_handlers.Contains(group->GetHandler()))
+        _handlers.Add(group->GetHandler());
+}