Generic factory capable of instantiating and pooling a list of entity objects.

FlatRedBall Generic Factory

using FlatRedBall.Graphics;
using FlatRedBall.Performance;
using System;
using System.Linq;

namespace MasteroidPE.Factories
{
    public class Factory<T> where T : IPoolable, IDestroyable, new()
    {
        PoolList<T> pool = new PoolList<T>();
        bool initialized = false;

        public void Initialize(int poolSize)
        {
            for(var i = 0; i < poolSize; i++)
            {
                T item = new T();
                pool.AddToPool(item);
            }

            initialized = true;
        }

        public virtual T CreateItem()
        {
            if(!initialized)
            {
                throw new Exception("This factory has not been initialized!");
            }

            if(!pool.HasAnyUnusedItems)
            {
                throw new Exception("Pool is out of objects. Pool size too small!");
            }

            var item = pool.GetNextAvailable();

            return item;
        }

        public virtual void ReleaseItem(T item)
        {
            if(pool.Contains(item))
            {
                pool.MakeUnused(item);
            }
        }

        public void Destroy()
        {
            foreach(var item in pool)
            {
                item.Destroy();
            }

            pool.MakeAllUnused();
            pool.Clear();
        }
    }
}