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【NopCommerce源码架构学习

发布时间:2016-11-08 01:03:21
单例模式是是常用经典十几种设计模式中最简单的。.NET中单例模式的实现也有很多种方式。下面我来介绍一下NopCommerce中单例模式实现。我之前的文章就分析了一下nop中EngineContext的实现。EngineContext是把一个Web请求用Nop的EngineCont ...

单例模式是是常用经典十几种设计模式中最简单的。.NET中单例模式的实现也有很多种方式。下面我来介绍一下NopCommerce中单例模式实现。

我之前的文章就分析了一下nop中EngineContext的实现。EngineContext是把一个Web请求用Nop的EngineContext引擎上下文封装。里面提供了一个IEngine的单例对象的访问方式。

下面就是EngineContext的源码:

一、EngineContext

 1 using System.Configuration; 2  3 using System.Runtime.CompilerServices; 4  5 using Nop.Core.Configuration; 6  7  8  9 namespace Nop.Core.Infrastructure 10  11 { 12  13   /// <summary> 14  15   ///Provides access to the singleton instance of the Nop engine. 16  17   ///提供了访问单例实例Nop引擎 18  19   /// </summary> 20  21   public class EngineContext 22  23   { 24  25     #region Methods 26  27  28  29     /// <summary> 30  31     /// Initializes a static instance of the Nop factory. 32  33     /// 初始化静态Nop工厂的实例 34  35     /// </summary> 36  37     /// <param name="forceRecreate">创建一个新工厂实例,尽管工厂已经被初始化</param> 38  39     [MethodImpl(MethodImplOptions.Synchronized)] 40  41     public static IEngine Initialize(bool forceRecreate) 42  43     { 44  45       if (Singleton<IEngine>.Instance == null || forceRecreate) 46  47       { 48  49         Singleton<IEngine>.Instance = new NopEngine(); 50  51  52  53         var config = ConfigurationManager.GetSection("NopConfig") as NopConfig; 54  55         Singleton<IEngine>.Instance.Initialize(config); 56  57       } 58  59       return Singleton<IEngine>.Instance; 60  61     } 62  63  64  65     /// <summary> 66  67     /// Sets the static engine instance to the supplied engine. Use this method to supply your own engine implementation. 68  69     /// 设置静态引擎实例提供的引擎, 70  71     /// </summary> 72  73     /// <param name="engine">The engine to use.</param> 74  75     /// <remarks>Only use this method if you know what you're doing.</remarks> 76  77     public static void Replace(IEngine engine) 78  79     { 80  81       Singleton<IEngine>.Instance = engine; 82  83     } 84  85     86  87     #endregion 88  89  90  91     #region Properties 92  93  94  95     /// <summary> 96  97     /// Gets the singleton Nop engine used to access Nop services. 98  99     /// </summary>100 101     public static IEngine Current102 103     {104 105       get106 107       {108 109         if (Singleton<IEngine>.Instance == null)110 111         {112 113           Initialize(false);114 115         }116 117         return Singleton<IEngine>.Instance;118 119       }120 121     }122 123 124 125     #endregion126 127   }128 129 }

原标题:【NopCommerce源码架构学习

关键词:架构

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