{
    "MovementSystem" : {},
    "RenderSystem" : {},
    "CollisionSystem" : {},
    "entities" : [
        {
            "PositionComponent" : {
                "x" : 10,
                "y" : 0,
                "z" : 10
            },
            "SpriteComponent" : {
                "source" : ""assets/textures/Goblin.png""
            },
            "ColliderComponent" : {}
        },
        {
            "PositionComponent" : {
                "x" : 0,
                "y" : 0,
                "z" : 30
            },
            "SpriteComponent" : {
                "source" : ""assets/textures/Hero.png""
            },
            "ColliderComponent" : {}
        }
    ]
}

System* GetSystem(string system_type)
{
    switch(system_type)
    {
        case "MovementSystem":
            return new MovementSystem();

        case "CollisionSystem"
            return new CollisionSystem();

        .
        .
        .

        default:
            return nullptr;
    }
}

System* moveSystem = GetSystem("MovementSystem");
System* collisionSystem = GetSystem("CollisionSystem");

moveSystem->update();
collisionSystem->update();