PoolWorldSubsystem.h

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// Fill out your copyright notice in the Description page of Project Settings.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Subsystems/WorldSubsystem.h"
#include "PoolWorldSubsystem.generated.h"
 
USTRUCT()
struct FObjectPool
{
    GENERATED_BODY()
 
public:
    UPROPERTY()
    TArray<TObjectPtr<AActor>> InactiveActors; 
};
 
struct FPendingPoolWarmup
{
    TSubclassOf<AActor> ActorClass;
    int32 RemainingCount = 0;
};
 
 
UCLASS()
class CK_UE_API UPoolWorldSubsystem : public UWorldSubsystem
{
    GENERATED_BODY()
public:
    virtual void OnWorldBeginPlay(UWorld& InWorld) override;
    
    UFUNCTION(BlueprintCallable, Category = "ObjectPool")
    AActor* GetActorFromPool(TSubclassOf<AActor> ActorClass, FVector Location, FRotator Rotation);
    
    UFUNCTION(BlueprintCallable, Category = "ObjectPool")
    void ReturnActorToPool(AActor* ActorToReturn);
 
private:
    AActor* CreateActorAndSetup(TSubclassOf<AActor> ActorClass, UWorld* World);
    AActor* CreateActorFromPendingWarmup(TSubclassOf<AActor> ActorClass);
    void QueuePoolWarmup(TSubclassOf<AActor> ActorClass, int32 ActorCount);
    void ProcessPendingPoolWarmup();
    void ScheduleNextPoolWarmup();
    
private:
    UPROPERTY()
    TMap<TSubclassOf<AActor>, FObjectPool> ObjectPools;
 
private:
    TArray<FPendingPoolWarmup> PendingPoolWarmups;
    bool bIsPoolWarmupActive = false;
};