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Introduced with the Microsoft .NET Framework 4, the Managed Extensibility Framework (MEF) attempts to give a consistent answer to the loud demand for tools for building plugin-based applications. A plugin-based application is an application that can rely on a number of optional components that are discovered and composed together at run time. Microsoft Visual Studio is an excellent example of this application; a simpler but still valid example is Windows Explorer, whose menus can be extended by registering shell extensions. A plugin-based application provides a number of extensibility points and builds its core user interface and logic using abstractions for those extensibility points. Some run-time code then attempts to resolve all pending dependencies in a quick and direct way.

In Solution Explorer, open the XMLDataReader file. Using Notepad, open the XMLDataReaderConstructorVB.txt file in the C:\rs2000sbs\chap14 folder. Copy the contents of the .txt file in Notepad and paste it into the XMLDataReader class in Visual Studio at line 31, replacing the placeholder comment on that line. The code for XMLDataReader constructor looks like this:

Aside from all these reasons, an application pool can recycle because of unhandled exceptions, timeouts, low memory, or threads or connection pool issues. In general, the worker process recycling is a defensive measure aimed at keeping the application in shape and preventing any worse troubles. An application restart is not free of issues because it causes the user s session to disappear, for example; however, that is probably the lesser evil compared to having a site that hangs or crashes. An application restart is not something you can spot easily. It manifests through diminished and periodical responsiveness of the site. Diagnosing the cause is usually hard. When you suspect undue process recycling, the first place to look is in the event viewer to see whether some interesting information is being tracked. Memory usage is another good successive area to investigate.

26:

In IIS 7.x, you can use the settings shown in Figure 2-19 to determine which event log entries you want to be generated in the case of process recycling events.

In all the examples I ve shown you so far, the application s code had to manually check that the cached element was already in the cache and hadn t been removed in the meantime; the code then had to read the cached element again if necessary:

To make sure you track effective termination of the application, or to handle that in a customized way, you can resort to using the following code, adapted from an old but very nice post by Scott Guthrie:

If Cache( Employees ) Is Nothing Then CacheEmployeesData() End If Get the cached data. Dim xmldoc As System.Xml.XmlDocument = _ DirectCast(Cache( Employees ), System.Xml.XmlDocument)

public static class HttpApplicationExtensions { public static void TrackAppShutdown(this HttpApplication theApp) { // Use reflection to grab the current instance of the HttpRuntime object var runtime = typeof(HttpRuntime).InvokeMember("_theRuntime", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.GetField, null, null, null); if (runtime == null) return; // Use reflection to grab the current value of an internal property explaining the // reason for the application shutdown var messageShutdown = runtime.GetType().InvokeMember("_shutDownMessage", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetField, null, runtime, null); // Log an entry in the event viewer (or elsewhere ...) if (!EventLog.SourceExists("YourApp")) EventLog.CreateEventSource("YourApp", "Application"); var log = new EventLog { Source = "YourApp" }; log.WriteEntry(messageShutdown, EventLogEntryType.Error); } }

This coding style is clumsy and adds a slight overhead each time you access an object. Fortunately, you can solve both problems by specifying a delegate to a callback proZ cedure in the last argument of the Insert and Add methods. This procedure is invoked by ASP.NET immediately after removing the element from the cache. Here s a protoZ type of the callback procedure that s invoked when the element is removed. As you see, its last argument lets you understand what exactly happened:

Written as an extension method for the HttpApplication object, the method can be invoked easily from the Application_End handler in global.asax, as shown here: