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Is used to start asynchronous processing
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Declares a delegate that is passed to BeginInvoke Creates a WorkUnit and set with supplied values Saves a pointer to the results
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Public Sub EndSort( _ ByVal ar As IAsyncResult, _ ByRef work As WorkUnit) Dim pdcb As ProcessCB Dim arr As AsyncResult arr = CType(ar, AsyncResult) pdcb = CType(arr.AsyncDelegate(), ProcessCB) pdcb.EndInvoke(work, ar) End Sub
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Retrieves values from the completed processing Blocks until the associated delegate completes execution
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BeginSort is called to start the file-sorting process. It accepts several parameters and returns an instance of an object that implements the IAsyncResult interface. The object that implements IAsyncResult will be passed to the EndSort method to retrieve any information produced by the asynchronous execution.
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In listing 17.2 we discussed the ProcessCB delegate. We create an instance of the ProcessCB delegate and call it pdcb. This delegate is associated with the ProcessDirectory method, which we cover in listing 17.4. We discussed the WorkUnit object earlier. It is used to pass processing information to the ProcessDirectory method. The parameters passed into the BeginSort method are transferred to the instance of the WorkUnit object. The BeginInvoke method of the pdcb delegate is used to begin the asynchronous delegate execution. It returns an instance of an object that supports IAsyncResult. We covered asynchronous execution of delegates in section 12.5. Notice that we pass in an instance of the AsyncCallback object, cb, as the second parameter to BeginInvoke. If cb is set to an instance of the AsyncCallback it will be invoked when the asynchronous operation completes. We then return the instance of the object that supports IAsyncResult to the calling method.
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EndSort is invoked to retrieve the instance of the WorkUnit class after processing is complete. The WorkUnit class could be used to store information regarding which files it sorted, where it put them, how long the operations took, and so on. Notice that we pass in an instance of an object that supports IAsyncResult to the EndSort method. This object serves as a token for retrieving the correct results.
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In order to invoke the EndInvoke method of the asynchronously executed delegate, we must first cast the instance of the object supporting IAsyncResult to an instance of the AsyncResult object. This is accomplished using VB.NET s CType method. Once we ve converted ar to arr, we can retrieve the ProcessCB delegate and invoke the EndInvoke method. This populates the work variable with a reference to the work variable passed into the BeginInvoke method earlier.
USING THE ASYNCHRONOUS DESIGN PATTERN
There are times that we don t need to perform asynchronous processing. Listing 17.4 contains the Sort method. Sort, unlike BeginSort, blocks until it completes.
Listing 17.4 Synchronous processing method (VB.NET)
Public Sub Sort( _ ByVal dir As String, _ ByVal pattern As String, _ ByVal outputDirectory As String, _ ByVal includePause As Boolean) Dim workunit As New workunit() workunit.includePause = includePause workunit.dir = dir workunit.outputdir = outputDirectory workunit.pattern = pattern ProcessDirectory(workunit) End Sub
Processes asynchronously
Creates a WorkUnit
Calls the ProcessDirectory method directly
B C D
Notice that the Sort method is considerably simpler than BeginSort and EndSort. The signature of the method is very similar. Since invocation is synchronous there is no reason to pass in a delegate to invoke when the method completes. We need to create an instance of the WorkUnit class in which to store the supplied parameters. These are the same steps from listing 17.3. Since Sort is a synchronous method we can call the ProcessDirectory method directly. This differs from the asynchronous approach that requires the creation of a delegate. The ProcessDirectory method is contained in listing 17.5.
Listing 17.5 File-processing methods of the Sorter class (VB.NET)
Private Sub ProcessDirectory(ByRef work As WorkUnit) work.AddToHistory("Process Directory {0}", work.dir) Dim files As String() Dim i As Integer files = Directory.GetFiles(work.dir, work.pattern) Raises the RaiseEvent Start(files.Length, work)
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