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This method isn t as elegant in most respects as wiring up the event handler as we did in the previous lesson because we have to poll for the results. This polling is running in the same thread, so it does block execution on that thread. (Blocking is the inter ruption of a thread until a value is returned.) A more elegant solution, similar to the first method that was illustrated, is using a call back method. Callback methods are exactly what their name implies: They call back to the application, metaphorically saying I m done. Using them is equally simple. In this case, you just need to specify an AsyncCallBack object and specify a target for it. Processing occurs asynchronously, and when it s completed, the callback notifies the application that it s finished. At that point, any return values can be retrieved:

You can use BeginInvoke and EndInvoke in several ways to implement asynchronous methods. Among them are:

'VB Public Sub GetTickerSymbolCallBack() Dim Lookup As New StockLookupService() Dim Callback As New AsyncCallback(AddressOf CompanyReturned) Dim Result As IAsyncResult = _ Lookup.BeginGetCompanyName("MSFT", Callback, Nothing) End Sub Public Sub CompanyReturned(ByVal result As IAsyncResult) Dim Lookup As New StockLookupService() Console.WriteLine(Lookup.EndGetCompanyName(result)) End Sub

In addition, the sys.dm_fts_index_population dynamic management object returns current population status. Figure 8-6 displays the sys.dm_fts_index_population function in its simplest form.

//C# static void GetTickerSymbolCallBack() { StockLookupService Lookup = new StockLookupService(); AsyncCallback Callback = new AsyncCallback(CompanyReturned); IAsyncResult Result = Lookup.BeginGetCompanyName("MSFT", Callback, null); } static void CompanyReturned(IAsyncResult result) { StockLookupService Lookup = new StockLookupService(); Console.WriteLine(Lookup.EndGetCompanyName(result)); }

Extending Microsoft SQL Server Functionality with the Spatial, Full-Text Search, and Service Broker

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Calling BeginInvoke, doing work, and then calling EndInvoke on the same thread. Calling BeginInvoke, polling IAsyncResult until the asynchronous operation is completed, and then calling EndInvoke. Calling BeginInvoke, specifying a callback method to be executed when the asyn chronous operation has completed, and calling EndInvoke on a separate thread.

If you invoked the GetTickerSymbolCallBack method with the following code, you d see the output I m running asynchronously before you d see the return value in the con sole window.

'VB GetTickerSymbolCallBack() Console.WriteLine("I'm running asynchronously") Console.ReadLine() //C# GetTickerSymbolCallBack(); Console.WriteLine("I'm running asynchronously"); Console.ReadLine();

To make the results more readable, you can create stored procedures that return a more user-friendly output. The code shown here uses aliases and system functions to improve the readability of the sys.dm_fts_index_population dynamic management view (DMV). Figure 8-7 shows the results of this query:

In the CompanyReturned method we re using the End<methodName> to retrieve the result of the method call. Although the signature of Begin<methodName> is totally dif ferent from the method it covers, the End<methodName> is of the same return type and in fact, returns the value of the method. However, in the first lesson we didn t see the details of the retrieval of values from the Web method. We wired up an event handler to respond when the method was fin ished executing, but we didn t respond with respect to the value returned by the method. Fortunately, it s trivial to get the return value using the event handler method. Using virtually identical code to the event handler example in Lesson 1, retrieving the return value of the method is shown here in bold:

The simplest way to implement an asynchronous method call is to call BeginInvoke, do some work, and then call EndInvoke on the same thread that BeginInvoke was called on. While this approach is simplest, a potential disadvantage is that the EndInvoke call will block execution of the thread until the asynchronous operation is completed if it has not completed yet. Thus your main thread might still be nonresponsive if the asynchronous operation is particularly time-consuming. The DelegateCallback and AsyncState parameters are not required for this operation and so Nothing (null in C#) can be supplied for these parameters. The following example demonstrates how to implement an asynchronous call in this way, using the TestMethod and myDelegate that were defined in the examples above:

'VB Private WithEvents AsyncLookup As StockLookupService Sub Main() AsyncLookup = New StockLookupService() AsyncLookup.GetCompanyNameAsync("MSFT") Console.ReadLine()

SELECT DB_NAME(database_id) AS 'Database Name' , database_id AS 'DB_ID' , OBJECT_NAME(table_id) AS 'Table Name' , table_id , population_type_description AS 'Population Desc.' , status_description AS 'Status Desc.' , completion_type_description AS 'Completion Desc.' , start_time FROM sys.dm_fts_index_population;

7

' VB Dim del As New myDelegate(AddressOf TestMethod)

To view what columns are included in a full-text index, you can use the sys.fulltext_index_ columns catalog view, as shown in the following command.

End Sub Public Sub GetTickerSymbolCompletedHandler(ByVal sender As Object, _ ByVal args As GetCompanyNameCompletedEventArgs) _ Handles AsyncLookup.GetCompanyNameCompleted If Not args.Error Is Nothing Then Console.WriteLine("Error: {0} Message: {1}", args.UserState, _ args.Error.Message)

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