Unity Reflection을 이용한 Factory pattern 구현.

Unity에서 사용할 factory pattern을 구현하던 도중 Unity3d College라는 채널에 올라온 영상을 보고 구현.

채널 자체는 기본적인 내용들이 들어가있어서 둘러보기 괜찮을 것 같다.

코드는 영상과 같진 않고, 조금씩만 바꿨다.

 

public interface IHaveStringIdentifier
{
    string Identifier { get; }
}

public interface IBuffBehavior : IHaveStringIdentifier
{
    void DoBuffBehavior();
}

public sealed class BonusHPBuff : IBuffBehavior
{
    public string Identifier => BuffBehaviorType.BonusHp.ToString();
    
    public void DoBuffBehavior() { Console.WriteLine("Do Bonus to HP!"); }
}

public sealed class BonusDamageBuff : IBuffBehavior
{
    public string Identifier => BuffBehaviorType.BonusDamage.ToString();
    
    public void DoBuffBehavior() { Console.WriteLine("Do Bonus to Damage!"); }
}

public static class BuffBehaviorFactory
{
    private static Dictionary<string, Type> _behaviorTypes = null;
    private static bool IsInit => _behaviorTypes != null;
    
    public static void InitializeFactory()
    {
        if (IsInit) return;
        
        var buffTypes = Assembly.GetAssembly(typeof(IBuffBehavior)).GetTypes()
            .Where(x => (typeof(IBuffBehavior).IsAssignableFrom(x) && x.IsAbstract() == false));
            
        _behaviorTypes = new Dictionary<string, Type>();
        
        foreach (var type in buffTypes)
        {
            var templateObject = Activator.CreateInstance(type) as IBuffBehavior;
            _behaviorTypes.Add(templateObject.Identifier, type);
        }
    }
    
    public static IBuffBehavior MakeBehavior(BuffBehaviorType behaviorEnumType)
    {
        var stringIdentifier = behaviorEnumType.ToString();
        
        if (_behaviorTypes.ContainsKey(stringIdentifier) == false)
        	return null;
            
        var behaviorType = _behaviorTypes[stringIdentifier];
        return Activator.CreateInstance(type) as IBuffBehavior;
    }
}