/////////////////////////////////////////////////////////////////////////////
//	File Description    : 业务逻辑层基类
//	Copyright           : Han He
// -------------------------------------------------------------------------
//	Date Created		: Mar 26, 2009
//	Author		        : jiangxinjun
// -------------------------------------------------------------------------
// 	Change History
//  ~~~~~~~~~~~~~~
//	Date Modified		: 
//	Changed By		    : 
//	Change Description  : 
//
/////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.Text;
using HH.AMS.DAL;

namespace HH.AMS.BLL
{
    /// <summary>
    /// 业务逻辑层基类
    /// </summary>
    public abstract class BaseBLL 
    {
        private Dictionary<Type, object> cacheInstance;

        internal Dictionary<Type, object> CacheInstance
        {
            get
            {
                if (cacheInstance == null)
                {
                    cacheInstance = new Dictionary<Type, object>();
                }
                return cacheInstance;
            }
        }

        internal T CreateDAL<T>()
            where T : BaseDAL, new()
        {
            return CreateDAL<T>(true);
        }

        internal T CreateDAL<T>(bool isUseCache)
            where T : BaseDAL, new()
        {
            if (!isUseCache)
            {
                return DAOManager.Create<T>();
            }

            Type type = typeof(T);

            if (!CacheInstance.ContainsKey(type))
            {
                CacheInstance.Add(type, DAOManager.Create<T>());
            }

            return CacheInstance[type] as T;
        }
    }
}