提高域事件对于多用户 [英] Raising Domain Events For Multiple Subscribers

问题描述

我指出来调查域事件模式，也读了不少资源，关于这个问题，但是我无法找到实施我们的要求的一个很好的方式。基本上我们有读取/用一个简单的CQRS实现写它包装库层的服务/业务层。我们有一个ASP.NET MVC应用程序消耗这个服务/业务层。整个应用程序与Autofac系在一起，我想发生这样的是以下内容：

I am stating to look into the Domain Events pattern and have read a lot of resources on the subject but I cannot find a good way of implementing for our requirements. Basically we have a Service/Domain layer which wraps the repository layer for reads/writes with a simplistic CQRS implementation. We have an ASP.NET Mvc application which consumes this service/domain layer. The whole application is tied together with Autofac and what I would like to happen is for the following:

在一个新闻条目是通过调用说：CreateNews上的服务创建层注册该事件将需要筹集如此：

When a news item is created by calling say "CreateNews" on the service layer register that an event will need to be raised as so:

public void CreateNews(Domain.Entities.News.NewsBO news)
{
  ValidateBusinessObject(news);

  var entityNews = AutoMapper.Mapper.Map<Repositories.Entities.News.News>(news);
  NewsCommandRepository.Create(entityNews);

  _domainEventManager.Register<NewsCreatedDomainEvent>(x => x.News = news);
}

这一切发生在一个事务中，我不希望真正提高直到保存事件被完成，因此我们将更改保存方法我想这样做：

This is all happening in a transaction and I don't want to actually raise the event until the save is completed so in our save changes method I want to do this:

public void SaveChanges()
{
  _repoCommandManager.SaveChanges();

  _domainEventManager.RaiseEvents();
}

然后在我们的ASP.NET MVC应用程序我想有一个实现IHandler它看起来像这样：

Then in our ASP.NET Mvc application I want to have an implementation of an IHandler which looks like this:

public class NewsCreatedDomainEventCacheHandler : IHandles<Project.Services.Domain.Events.News.NewsCreatedDomainEvent>
{ 
    public void Handle(Services.Domain.Events.News.NewsCreatedDomainEvent @event)
    {
      // In here we would update the cache or something else particular to the web layer
    }
}

我无法弄清楚如何去提高这个从保存方法事件，并呼吁在Web.Mvc应用程序的执行情况。

I cannot figure out how to go about raising this event from the save method and calling the implementation in the Web.Mvc application.

任何建议，将不胜感激。

Any suggestions would be appreciated.

推荐答案

我觉得我有如何做到这一点的一个例子，我碰巧使用MVC和AutoFac也！在我的具体的例子，我专注于命令/查询分离，但在这样做，所以我不得不执行域事件模式。

I think I have an example of how to do this for you and I happen to be using MVC and AutoFac also! In my specific example I am concentrating on Command/Query separation but in doing so I had to implement a domain event pattern.

首先有这个博客帖子的读取，所以你得到的东西怎么挂在一起是什么代码看起来像一个概述和：
的 http://www.nootn.com.au/2013/03/command-query-separation-to-better.html

First have a read of this blog post so you get an overview of how things hang together and what the code looks like: http://www.nootn.com.au/2013/03/command-query-separation-to-better.html

因此，我建议在安装 DotNetAppStarterKit.Web.Mvc的NuGet包，再看看在 Global.asax文件如何到你需要的所有组件注册。您可以仔细阅读喜欢的事情事件订阅中的应用SampleMvc

So I would recommend installing the DotNetAppStarterKit.Web.Mvc NuGet package, then take a look at the Global.asax file for how to register all the components you will need. You can peruse the SampleMvc application for things like Event Subscribers.

我希望这有助于和让您能和去快。你可以只用DotNetAppStarterKit的事件发布/订阅的部分，而无需使用命令和查询。

I hope this helps and gets you up and going quickly. You can just use the event publisher/subscriber parts of DotNetAppStarterKit without using commands and queries.

这篇关于提高域事件对于多用户的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！