LevelStreamingGCHelper.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Engine/EngineBaseTypes.h"
 
class ULevel;
class UWorld;
 
struct FLevelStreamingGCHelper
{
    DECLARE_MULTICAST_DELEGATE(FOnGCStreamedOutLevelsEvent);
    static ENGINE_API FOnGCStreamedOutLevelsEvent OnGCStreamedOutLevels;
 
    static ENGINE_API void AddGarbageCollectorCallback();
 
    static ENGINE_API void RequestUnload( ULevel* InLevel );
 
    static ENGINE_API void CancelUnloadRequest( ULevel* InLevel );
 
    static ENGINE_API int32 GetNumLevelsPendingPurge();
 
    static ENGINE_API void TrashPackage(UPackage* InPackage);
 
    static ENGINE_API void EnableForCommandlet();
    
private:
    static void PrepareStreamedOutLevelsForGC();
 
    static void VerifyLevelsGotRemovedByGC();
 
    static void OnPreGarbageCollect();
 
    static void OnWorldTickEnd(UWorld* InWorld, ELevelTick InTickType, float InDeltaSeconds);
 
    static void PrepareStreamedOutLevelForGC(ULevel* Level);
 
    static TArray<TWeakObjectPtr<ULevel> > LevelsPendingUnload;
 
    static TSet<FName> LevelPackageNames;
 
    static bool bEnabledForCommandlet;
 
    static bool bIsPrepareStreamedOutLevelForGCDelayedToWorldTickEnd;
 
    static int32 NumberOfPreparedStreamedOutLevelsForGC;
};