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Let s roll a first asynchronous test page to download and process some RSS feeds. The page markup is quite simple indeed:

<%@ Page Async="true" Language="C#" AutoEventWireup="true" CodeFile="TestAsync.aspx.cs" Inherits="TestAsync" %> <html> <body> <form id="form1" runat="server"> <% = RssData %> </form> </body> </html>

In this procedure, you will open the Site Settings page in Report Manager to review the current execution logging settings.

bv(se1) = 10

The code file is shown next, and it attempts to download the RSS feed from my personal blog:

bv(se2) = 20

public partial class TestAsync : System.Web.UI.Page { const String RSSFEED = "http://weblogs.asp.net/despos/rss.aspx"; private WebRequest req; public String RssData { get; set; } void Page_Load (Object sender, EventArgs e) { AddOnPreRenderCompleteAsync(BeginTask, EndTask); } IAsyncResult BeginTask(Object sender, EventArgs e, AsyncCallback cb, Object state) { // Trace Trace.Warn("Begin async: Thread=" + Thread.CurrentThread.ManagedThreadId.ToString()); // Prepare to make a Web request for the RSS feed req = WebRequest.Create(RSSFEED); // Begin the operation and return an IAsyncResult object return req.BeginGetResponse(cb, state); } void EndTask(IAsyncResult ar) { // This code will be called on a(nother) pooled thread using (var response = req.EndGetResponse(ar)) { String text; using (var reader = new StreamReader(response.GetResponseStream())) { text = reader.ReadToEnd(); } // Process the RSS data rssData = ProcessFeed(text); } // Trace Trace.Warn("End async: Thread=" + Thread.CurrentThread.ManagedThreadId.ToString()); // The page is updated using an ASP-style code block in the ASPX // source that displays the contents of the rssData variable }

bv(se3) = 40

String ProcessFeed(String feed) { // Build the page output from the XML input ... } }

Console.WriteLine(bv(se1))

As you can see, such an asynchronous page differs from a standard one only for the aforementioned elements the Async directive attribute and the pair of asynchronous event handlers. Figure 5-4 shows the sample page in action.

It would also be interesting to take a look at the messages traced by the page. Figure 5-5 provides visual clues of it. The Begin and End stages are served by different threads and take place at different times. Note the time elapsed between the Exit BeginTask and Enter EndTask stages. It is much longer than intervals between any other two consecutive operations. It s in that interval that the lengthy operation in this case, downloading and processing the RSS feed took place. The interval also includes the time spent to pick up another thread from the pool to serve the second part of the original request.

Console.WriteLine(bv(se2))

whereas execution logs are stored in the ReportServer database. Because execution logs are intended for continual analysis, the data is stored relationally. The information that is stored in the ExecutionLog table of the ReportServer database is not the best format for general reporting and analysis, but you can create your own logging database to which you can export logging records on a periodic basis. Reporting Services supplies you with the following tools to facilitate reporting on the logs:

The AddOnPreRenderCompleteAsync method is not the only tool you have to register an asynchronous task. The RegisterAsyncTask method is, in most cases, an even better solution. RegisterAsyncTask is a void method and accepts a PageAsyncTask object. As the name suggests, the PageAsyncTask class represents a task to execute asynchronously. The following code shows how to rework the sample page that reads some RSS feed and make it use the RegisterAsyncTask method:

Console.WriteLine(bv(se3))

void Page_Load (object sender, EventArgs e) { PageAsyncTask task = new PageAsyncTask( new BeginEventHandler(BeginTask), new EndEventHandler(EndTask), null, null); RegisterAsyncTask(task); }

The Data property sets or returns the internal 32-bit integer; you can use this property to save the bit-coded value into a database field or to pass it to a hardware device:

The constructor accepts up to five parameters, as shown in the following code:

Read the entire field as a 32-bit value. Console.WriteLine(bv.Data) Console.WriteLine(bv.Data.ToString( X )) => 20810 => 514A

public PageAsyncTask( BeginEventHandler beginHandler, EndEventHandler endHandler, EndEventHandler timeoutHandler, object state, bool executeInParallel)

In Visual Basic 6 you can simulate a last-in-first-out (LIFO) structure by using an array and an Integer variable that works as the pointer to the current element. Under Visual Basic .NET, you can build a stack structure by simply instantiating a System.Collec tions.Stack object: