using Autofac;
using Autofac.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using APT.Infrastructure.Core;
namespace APT.Infrastructure.Api
{
    /// <summary>
    /// 服务对象定位器
    /// </summary>
    public sealed class ServiceLocator  
    {
        #region fields 
        #endregion
        private IServiceProvider _autofacServiceProvider = null;
        #region ctor.

        private ServiceLocator()
        {
            ContainerBuilder builder = new ContainerBuilder();
            builder.RegisterModule<DefaultAutofacModuleRegister>();
           var  AutofacContainer = builder.Build();
            _autofacServiceProvider = new AutofacServiceProvider(AutofacContainer); 
        }

        #endregion

        #region properties

        #region Instance
        private static readonly ServiceLocator s_Instance = new ServiceLocator();

        /// <summary>
        /// 服务对象定位器实例
        /// </summary>
        public static ServiceLocator Instance
        {
            get { return s_Instance; }
        }
        #endregion

       

        #endregion

        #region methods

         

        /// <summary>
        /// 获取泛型服务对象
        /// </summary>
        /// <typeparam name="T">服务对象的类型</typeparam>
        /// <returns></returns>
        /// 
        public T GetService<T>()
        {
            if (HttpContext.Current != null && HttpContext.Current.RequestServices != null)
            	return (T)HttpContext.Current.RequestServices.GetService(typeof(T));
            if (_autofacServiceProvider != null)
                return (T)_autofacServiceProvider.GetService(typeof(T));
            return default(T);
        }

       
        #endregion

 
    }

    
}