vb.net code 128 Displays recent visitors in .NET framework

Make USS Code 128 in .NET framework Displays recent visitors

Listing 23.13 Displays recent visitors
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<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Visitor[]>" %> <%@ Import Namespace="Core"%> <div style="text-align:left"> <h3>Recent Visitors</h3> <%foreach (var visitor in ViewData.Model){%> <%=visitor.VisitDate%> <%=visitor.IpAddress%> <%=visitor.LoginName%> <%=visitor.PathAndQuerystring%><br /> <%=visitor.Browser%><hr /> <%}%> </div>
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Pulling it together
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This partial is added to the page via the master page. The array of visitors is expected to be in ViewData.Model so that the array can be rendered the default way. At the bottom of the master page, the following code passes just the visitor array to the partial:
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<%Html.RenderPartial(Constants.Partials.VISITORS, ViewData[Constants.ViewData.VISITORS]); %>
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We use constants so that the views don t contain duplicate string literals. Because logging and displaying visitor information are cross-cutting concerns for the application, we ve taken steps to keep the logic factored out so that it can be shared across all controllers in the application. Let s review what we ve done:
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Kept the persistence logic behind an interface that doesn t belong to the UI project Leveraged action filters so that no single controller is responsible for knowing how to interact with IVisitorRepository Created a partial view to own the layout of the recent visitors Delegated to the partial view from the master page so that individual views don t have to care about rendering visitor information
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All the pieces are now in place to be pulled together.
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23.6 Pulling it together
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If you ve been keeping a close eye on the code up to this point, you ll have noticed that we don t have a default way to create the NHibernate repository instance of IVisitorRepository that lives in the Infrastructure project. Our UI project doesn t reference the Infrastructure project at all. This section will walk through the process of wiring up these decoupled pieces. The first piece is in the Web.config file. Inside the httpModules node, we ve registered an extra module:
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<add name="StartupModule" type="Infrastructure.NHibernateModule, Infrastructure, Version=1.0.0.0, Culture=neutral"/>
This module kicks off the process of creating the session factory. It also handles the BeginRequest and EndRequest events and creates and destroys NHibernate sessions for each web request. Listing 23.14 shows the code for NHibernateModule.cs, which lives in the Infrastructure project.
Listing 23.14 NHibernateModule, which kick-starts NHibernate
using System; using System.Web; namespace Infrastructure {
Data access with NHibernate
public class NHibernateModule : IHttpModule { private static bool _startupComplete = false; private static readonly object _locker = new object(); public void Init(HttpApplication context) { context.BeginRequest += context_BeginRequest; context.EndRequest += context_EndRequest; } private void context_BeginRequest(object sender, EventArgs e) { Opens session when EnsureStartup(); request starts new DataConfig().StartSession(); } private void context_EndRequest(object sender, EventArgs e) { new DataConfig().EndSession(); Ends session when } request ends private void EnsureStartup() { if (!_startupComplete) { lock (_locker) { if (!_startupComplete) { new DataConfig().PerformStartup(); _startupComplete = true; } } } } public void Dispose() { } } }
The DataConfig class (shown earlier in listing 23.7) is responsible for creating ISession instances and storing them in the SessionCache, which is shown in listing 23.15 (along with the relevant method from DataConfig).
Listing 23.15 Session cache that keeps session in HttpContext items
using System.Collections; using System.Web; using NHibernate; namespace Infrastructure { public class SessionCache {
Pulling it together
private const string SESSION_KEY = "NHIBERNATE_SESSION"; private static readonly IDictionary _cacheStore = new Hashtable(); public ISession GetSession() { var session = (ISession) GetCacheStore()[SESSION_KEY]; return session; } public void CacheSession(ISession session) { GetCacheStore()[SESSION_KEY] = session; } private static IDictionary GetCacheStore() { if (HttpContext.Current != null) return HttpContext.Current.Items; return _cacheStore; } } } //DataConfig.cs Part of ... DataConfig.cs private void InitializeRepositories() { Func<IVisitorRepository> builder = () => new VisitorRepository(); VisitorRepositoryFactory.RepositoryBuilder = builder; } ...
Now that we have a session factory and we have a session, our application can call NHibernate and communicate with the database. Aside from the NHibernate initialization, we have the initialization of the VisitorRepositoryFactory. Many applications use IoC tools, which provide these factories automatically; but because this example doesn t leverage an IoC container, we had to provide this startup logic explicitly. There are several ways to do that; for example, we could declare an interface for the factory and keep an implementation around. Use your judgment when choosing a technique. The important thing is that neither the Core project nor the UI project should reference the Infrastructure project or libraries that are purely infrastructural in nature. We ve kept NHibernate completely off to the side so that the rest of the application doesn t care how the data access is happening. There s one final missing piece required before we can run this application from Visual Studio using Ctrl-F5. The Web.config file refers to a class in the Infrastructure project, but because there s no reference, the Infrastructure assembly won t be in the bin folder of the website. We could copy it explicitly every time we compile, but that would get tiresome. The solution is to have Visual Studio copy it every time it s compiled by adding the lines in listing 23.16 to the Infrastructure.csproj file as a postbuild event.
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