Breaking Level Instances in batches: bound the work and stop on failure

Break All LevelInstances

Introduction

This function recursively breaks all LevelInstances in the scene.

Implementation

UFUNCTION(BlueprintCallable, meta=(WorldContext="WorldContextObject", CallableWithoutWorldContext))  
static void BreakAllLevelInstance(UObject* WorldContextObject);

void UMyBlueprintFunctionLibrary::BreakAllLevelInstance(UObject* WorldContextObject)
{
	if(WorldContextObject)
	{
		TArray<AActor*> OutActor;
		bool Stop;
		do
		{
			Stop = true;
			OutActor.Empty();
			UGameplayStatics::GetAllActorsOfClass(WorldContextObject, ALevelInstance::StaticClass(), OutActor);
			for(const auto& It : OutActor)
			{
				if(ILevelInstanceInterface* LevelInstance = Cast<ILevelInstanceInterface>(It))
				{
					if(!LevelInstance || !Cast<AActor>(LevelInstance))continue;
					UE_LOG(LogTemp, Log, TEXT("BreakLevelInstance::%s"), *It->GetPathName());
					WorldContextObject->GetWorld()->GetSubsystem<ULevelInstanceSubsystem>()->BreakLevelInstance(LevelInstance, 1);
					Stop = false;
				}
			}	
		}
		while (!Stop);
	}
}