通过组织Repository,我们可以让多个Repository共用同一个DbContext。其实我们还可以更进一步:
让每一次Http请求都使用而且只使用同一个DbContext —— 这就是 Context Per Request 模式。
ConnectionPerRequest
呈现一个完整的页面,可能会有很多次的数据库操作。以“内容列表页”为例,想一想:
- 导航栏LogonStatus:查找当前用户+更新帮帮豆(可能)
- 列表:获得当前页的Problem
- 分页:获得Problem总数
- 右侧widget:……
每一次查找,都要使用一次数据库链接,消耗性能。能不能每一个Request请求,都只使用一个数据库链接?在接受到HTTP请求时打开连接,在HTTP请求结束时关闭连接?
OK,ASP.NET为我们提供这种机制:Filter。
学习Filter首先要了解一个
带来的好处
提高性能
减少了DbContext的生成:以前一次Http请求,可能需要new好几个DbContext的,现在一次就OK了。
当然,这样每一个DbConext占用的时间会更长,好在Web项目中每一次Http请求消耗的时间都不会太长,所以通常这都不是一个问题。
在Request层面实现 Unit of Work
几乎所有的Http请求,天然要求“事务”属性。比如用户在文章发布页面点击发布按钮,当然是希望和文章发布相关的所有业务逻辑(比如扣帮帮币加帮帮点生成消息等等)都实现,不可能文章发布失败但帮帮币给扣掉了啥的…… Context Per Request 就能够:
- 在Context生成的时候,启动事务
- 在Request结束的时候,提交/回滚事务
@想一想@:如果一个HttpRequest只是进行查询,放到事务里面会影响性能么?
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,存放在哪里?
ASP.NET为我们提供了一个Dictionary容器:HttpContext.Current.Items,它存放在当前Http请求的上下文环境中,即:如果Http请求结束,Items也消失;一个Http请求一个Items——这是一个绝佳的存放DbContext的容器。
存入/读取
为了便于所有Service获取DbContext实例,我们在BaseService中添加一个dbContext只读属性:
protected SqlContext dbContext { get {
然后,用我们已经非常熟悉的方式处理:
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以便下次使用 HttpContext.Current.Items[contextKey] = context; }//else nothing return context;
这样就能保证一个Http请求中,通过dbContext始终只能获得一个SqlContext实例。比如ArticleService:
public class ArticleService : BaseService, IArticleService { private ArticleRepository _repository; public ArticleService() { _repository = new ArticleRepository(dbContext); }
ActionFilter
在什么时候,通过什么方式同步DbContext中的变化(提交事务)呢?一个方便的办法是利用ActionFilter(也可以是IActionFilter)。
因为我们使用的是独立的ViewModel,所以一旦Action执行完成,就完成了ViewModel的全部付诸,不再需要DbContext了,所以可以
新建一个Filter:
public class ContextPerRequest : ActionFilterAttribute
然后override OnActionExecuted(),在这里面完成事务提交/回滚
public override void OnActionExecuted(ActionExecutedContext filterContext)
接着,可以把 ContextPerRequest 放置在BaseController上,以确保所有Controller都被覆盖:
[ContextPerRequest] public class BaseController : Controller
Filter中的AutoFac
为了照顾MockService,Filter中不能直接new XService(),需要通过AutoFac解析Service实例。怎么办呢?非常简单:
首先,在Golbal.asax.cs中添加:
builder.RegisterFilterProvider();
然后,直接在Filter中声明一个Service属性:
public IBaseService Service { get; set; }
接下来就可以直接用这个Service了。
演示:Sevice对象按AutoFac配置实例化
ChildAction
首先,需要注意如果是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,所以的未处理的异常,都可以从filterContext.Exception中获取;
- 如果没有任何异常,filterContext.Exception就为null值。
而且,无论是否报异常,都不影响ActionFilter的执行。_(演示)_
BaseService
需要小心处理两个问题:
- null值检查
- 资源销毁
Commit()方法
首先可以抽象出一个私有方法:
///
该方法还可供dbContext/Rollback()等重用。
然后尽量使用using包裹context和transaction,确保他们都能被释放:
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(); //不需要判断transaction是否为null //如果transaction是null就应该报异常 transaction.Commit(); //不需要rollback: //是SaveChanges()是一个隐式事务,失败都会自动回滚 //transaction在using中,如果失败,Dipsose()时也会回滚, } } //没有context就不需要处理 }
对其他方法的影响
注意我们在Commit()时调用了context.SaveChanges(),所以我们_可以_减少其他地方SaveChanges()的调用,比如:
public void AddRange(IEnumerable
已经entity状态的变化,比如:
User author = repository.Find(authorId); Article article = new Article { Author = author }; //repository().SaveChanges();
但是,有些地方调用SaveChanges()还是必须的,比如新建一个对象之后,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()方法
大体和Commit()类似,但更简单:
using (SqlContext context = getContextFromHttp()) { //还是需要using,以便Dispose() using (DbContextTransaction tran = context.Database.CurrentTransaction) { tran.Rollback(); } }https://github.com/hdfgfgh546...
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