关于chrome-devtools:分层架构ContextPerRequest

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通过组织 Repository，咱们能够让多个 Repository 共用同一个 DbContext。其实咱们还能够更进一步：

让每一次 Http 申请都应用而且只应用同一个 DbContext —— 这就是 Context Per Request 模式。

ConnectionPerRequest

出现一个残缺的页面，可能会有很屡次的数据库操作。以“内容列表页”为例，想一想：

  • 导航栏 LogonStatus：查找以后用户 + 更新帮帮豆（可能）
  • 列表：取得当前页的 Problem
  • 分页：取得 Problem 总数
  • 右侧 widget：……

每一次查找，都要应用一次数据库链接，耗费性能。能不能每一个 Request 申请，都只应用一个数据库链接？在承受到 HTTP 申请时关上连贯，在 HTTP 申请完结时敞开连贯？

OK，ASP.NET 为咱们提供这种机制：Filter。

学习 Filter 首先要理解一个

带来的益处

进步性能

缩小了 DbContext 的生成：以前一次 Http 申请，可能须要 new 好几个 DbContext 的，当初一次就 OK 了。

当然，这样每一个 DbConext 占用的工夫会更长，好在 Web 我的项目中每一次 Http 申请耗费的工夫都不会太长，所以通常这都不是一个问题。

在 Request 层面实现 Unit of Work

简直所有的 Http 申请，人造要求“事务”属性。比方用户在文章发布页面点击公布按钮，当然是心愿和文章公布相干的所有业务逻辑（比方扣帮帮币加帮帮点生成音讯等等）都实现，不可能文章公布失败但帮帮币给扣掉了啥的……  Context Per Request 就可能：

  1. 在 Context 生成的时候，启动事务
  2. 在 Request 完结的时候，提交 / 回滚事务

@想一想 @：如果一个 HttpRequest 只是进行查问，放到事务外面会影响性能么？

SELECT *

BEGIN TRAN
SELECT * COMMIT

是一样的么？

HttpContext 容器

第一个要解决的问题：每一次用到的 DbContext，寄存在哪里？

ASP.NET 为咱们提供了一个 Dictionary 容器：HttpContext.Current.Items，它寄存在以后 Http 申请的上下文环境中，即：如果 Http 申请完结，Items 也隐没；一个 Http 申请一个 Items——这是一个绝佳的寄存 DbContext 的容器。

存入 / 读取

为了便于所有 Service 获取 DbContext 实例，咱们在 BaseService 中增加一个 dbContext 只读属性：

protected SqlContext dbContext {get {

而后，用咱们曾经十分相熟的形式解决：

string contextKey = “dbContext”; // 尝试从 HttpContext.Current.Items 中获取 DbContext SqlContext context = HttpContext.Current.Items[contextKey] as SqlContext; // 获取不到就生成一个 if (context == null) {context = new SqlContext(); // 不要忘了启动事务 context.Database.BeginTransaction(); // 将 DbContext 存入 Items 以便下次应用 HttpContext.Current.Items[contextKey] = context; }//else nothing return context;

这样就能保障一个 Http 申请中，通过 dbContext 始终只能取得一个 SqlContext 实例。比方 ArticleService：

public class ArticleService : BaseService, IArticleService {private ArticleRepository _repository; public ArticleService() {_repository = new ArticleRepository(dbContext); }

ActionFilter

在什么时候，通过什么形式同步 DbContext 中的变动（提交事务）呢？一个不便的方法是利用 ActionFilter（也能够是 IActionFilter）。

因为咱们应用的是独立的 ViewModel，所以一旦 Action 执行实现，就实现了 ViewModel 的全副付诸，不再须要 DbContext 了，所以能够

新建一个 Filter：

public class ContextPerRequest : ActionFilterAttribute

而后 override OnActionExecuted()，在这外面实现事务提交 / 回滚

public override void OnActionExecuted(ActionExecutedContext filterContext)

接着，能够把 ContextPerRequest 搁置在 BaseController 上，以确保所有 Controller 都被笼罩：

[ContextPerRequest] public class BaseController : Controller

Filter 中的 AutoFac

为了关照 MockService，Filter 中不能间接 new XService()，须要通过 AutoFac 解析 Service 实例。怎么办呢？非常简单：

首先，在 Golbal.asax.cs 中增加：

builder.RegisterFilterProvider();

而后，间接在 Filter 中申明一个 Service 属性：

public IBaseService Service {get; set;}

接下来就能够间接用这个 Service 了。

演示：Sevice 对象按 AutoFac 配置实例化

ChildAction

首先，须要留神如果是 ChildAction，不应该进行提交 / 回滚：

if (!filterContext.IsChildAction) {if (filterContext.Exception == null)//…. }//else nothing

Commit 还是 Rollback？

接着，利用 filterContext 的 Exception 属性：

if (!filterContext.IsChildAction) {if (filterContext.Exception == null) {Service.Commit(); } else {Service.Rollback(); } }

因为：

  • 在 Filter 运行之前，所以的未解决的异样，都能够从 filterContext.Exception 中获取；
  • 如果没有任何异样，filterContext.Exception 就为 null 值。

而且，无论是否报异样，都不影响 ActionFilter 的执行。_（演示）_

BaseService

须要小心解决两个问题：

  1. null 值查看
  2. 资源销毁

Commit() 办法

首先能够形象出一个公有办法：

/// <summary> /// 从 HttpContext 中取以后 SqlContext /// </summary> /// <returns> 取不到就是 null 值 </returns> private SqlContext getContextFromHttp() // 办法名要长！区别于 dbContext { return HttpContext.Current.Items[“dbContext”] as SqlContext; }

该办法还可供 dbContext/Rollback() 等重用。

而后尽量应用 using 包裹 context 和 transaction，确保他们都能被开释：

using (SqlContext context = getContextFromHttp()) {if (context != null) /context 可能为 null/ {using (DbContextTransaction transaction = context.Database.CurrentTransaction) {// 确保 context 没有未提交的更改 context.SaveChanges(); // 不须要判断 transaction 是否为 null // 如果 transaction 是 null 就应该报异样 transaction.Commit(); // 不须要 rollback：// 是 SaveChanges() 是一个隐式事务，失败都会主动回滚 //transaction 在 using 中，如果失败，Dipsose() 时也会回滚，} } // 没有 context 就不须要解决 }

对其余办法的影响

留神咱们在 Commit() 时调用了 context.SaveChanges()，所以咱们_能够_缩小其余中央 SaveChanges() 的调用，比方：

public void AddRange(IEnumerable<T> articles) {entities.AddRange(articles); //sqlContext.SaveChanges();}

曾经 entity 状态的变动，比方：

User author = repository.Find(authorId); Article article = new Article {Author = author}; //repository().SaveChanges();

然而，有些中央调用 SaveChanges() 还是必须的，比方新建一个对象之后，要获取它的 Id：

public int Add(T entity) {entities.Add(entity); SaveChanges(); // 不 SaveChanges()，Id 只能是 O return entity.Id; }

Rollback() 办法

大体和 Commit() 相似，但更简略：

using (SqlContext context = getContextFromHttp()) {// 还是须要 using，以便 Dispose() using (DbContextTransaction tran = context.Database.CurrentTransaction) {tran.Rollback(); } }https://github.com/hdfgfgh546…
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