‫استفاده از الگوی Adapter در تزریق وابستگی‌ها

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

namespace ASPPatterns.Chap2.Service
{
    public class Product
    {
    }

    public class ProductRepository
    {
        public IList<Product> GetAllProductsIn(int categoryId)
        {
            IList<Product> products = new List<Product>();
            // Database operation to populate products …
            return products;
        }
    }

    public class ProductService
    {
        private ProductRepository _productRepository;
        public ProductService()
        {
            _productRepository = new ProductRepository();
        }

        public IList<Product> GetAllProductsIn(int categoryId)
        {
            IList<Product> products;
            string storageKey = string.Format("products_in_category_id_{0}", categoryId);
            products = (List<Product>)HttpContext.Current.Cache.Get(storageKey);
            if (products == null)
            {
                products = _productRepository.GetAllProductsIn(categoryId);
                HttpContext.Current.Cache.Insert(storageKey, products);
            }
            return products;
        }
    }
}

using System;
using System.Collections.Generic;

namespace ASPPatterns.Chap2.Service
{
    public interface IProductRepository
    {
        IList<Product> GetAllProductsIn(int categoryId);
    }

    public class ProductRepository : IProductRepository
    {
        public IList<Product> GetAllProductsIn(int categoryId)
        {
            IList<Product> products = new List<Product>();
            // Database operation to populate products …
            return products;
        }
    }

    public class ProductService
    {
        private IProductRepository _productRepository;
        public ProductService(IProductRepository  productRepository)
        {
            _productRepository = productRepository;
        }

        public IList<Product> GetAllProductsIn(int categoryId)
        {
            //…
        }
    }
}

public class ProductService
{
    private IProductRepository _productRepository;
    private ICacheStorage _cacheStorage;
    public ProductService(IProductRepository  productRepository,
    ICacheStorage cacheStorage)
    {
        _productRepository = productRepository;
        _cacheStorage = cacheStorage;
    }

    public IList<Product> GetAllProductsIn(int categoryId)
    {
        IList<Product> products;
        string storageKey = string.Format("products_in_category_id_{0}", categoryId);
        products = _cacheStorage.Retrieve<List<Product>>(storageKey);
        if (products == null)
        {
            products = _productRepository.GetAllProductsIn(categoryId);
            _cacheStorage.Store(storageKey, products);
        }
        return products;
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
namespace ASPPatterns.Chap2.Service
{
    public class HttpContextCacheAdapter : ICacheStorage
    {
        public void Remove(string key)
        {
            HttpContext.Current.Cache.Remove(key);
        }

        public void Store(string key, object data)
        {
            HttpContext.Current.Cache.Insert(key, data);
        }

        public T Retrieve<T>(string key)
        {
            T itemStored = (T)HttpContext.Current.Cache.Get(key);
            if (itemStored == null)
                itemStored = default(T);
            return itemStored;
        }
    }
}