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558 ChAPTER 10
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Writing and Working with HTTP Modules and Web Services
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Consider the image handler created in the previous example. We can rewrite that example to demonstrate asynchronous processing. You start by implementing the IHttpAsyncHandler interface. Remember, you write your code inside the BeginProcessRequest method. You must also include code for IsReusable, EndProcessRequest, and ProcessRequest. You can make the latter simply throw an exception if your handler is called in a synchronous way. Inside BeginProcessRequest, you create an instance of a class that implements the IAsyncResult interface. This custom class is where you put your code that is to be run on a separate thread. In the example code shown next, that is done inside the StartAsync method. Notice the call to ThreadPool.QueueUserWorkItem. This passes the name of the method (StartAsyncOperation) you want to run on a separate thread. When a thread becomes available, this method will execute. When it is finished, the method running on the separate thread invokes the callback delegate, which is of type AsyncCallback.
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Sample of Visual Basic Code Imports Microsoft.VisualBasic Imports System.Threading Public Class AsynchImageHandler Implements IHttpAsyncHandler Public ReadOnly Property IsReusable As Boolean _ Implements System.Web.IHttpHandler.IsReusable Get Return False End Get End Property Public Function BeginProcessRequest(ByVal context As System.Web.HttpContext, _ ByVal cb As System.AsyncCallback, ByVal extraData As Object) _ As System.IAsyncResult _ Implements System.Web.IHttpAsyncHandler.BeginProcessRequest context.Response.Write("<p>BeginProcessRequest starting ...</p>") Dim imageOperation As New ImageAsynchOperation(cb, context, extraData) imageOperation.StartAsync() context.Response.Write("<p>BeginProcessRequest queued ...</p>") Return imageOperation End Function
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Lesson 1: Creating HTTP Handlers and HTTP Modules
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ChAPTER 10
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Public Sub EndProcessRequest(ByVal result As System.IAsyncResult) _ Implements System.Web.IHttpAsyncHandler.EndProcessRequest 'process any cleanup code here End Sub Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) _ Implements System.Web.IHttpHandler.ProcessRequest Throw New InvalidOperationException() End Sub End Class Class ImageAsynchOperation Implements IAsyncResult Private Private Private Private _completed As Boolean _state As [Object] _callback As AsyncCallback _context As HttpContext
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Public Sub New(ByVal callback As AsyncCallback, _ ByVal context As HttpContext, _ ByVal state As [Object]) _callback = callback _context = context _state = state _completed = False End Sub ReadOnly Property IsCompleted() As Boolean _ Implements IAsyncResult.IsCompleted Get Return _completed End Get End Property ReadOnly Property AsyncWaitHandle() As WaitHandle _ Implements IAsyncResult.AsyncWaitHandle Get Return Nothing End Get End Property
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560 ChAPTER 10
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ReadOnly Property AsyncState() As [Object] _ Implements IAsyncResult.AsyncState Get Return _state End Get End Property ReadOnly Property CompletedSynchronously() As Boolean _ Implements IAsyncResult.CompletedSynchronously Get Return False End Get End Property Public Sub StartAsync() ThreadPool.QueueUserWorkItem(New _ WaitCallback(AddressOf StartAsyncOperation), Nothing) End Sub Private Sub StartAsyncOperation(ByVal workItemState As [Object]) Dim Request As HttpRequest = _context.Request Dim Response As HttpResponse = _context.Response If Request.RawUrl.ToLower.Contains("jellyfish") Then Response.Write("<p>JellyFish</p>") ElseIf Request.RawUrl.ToLower.Contains("koala") Then Response.Write("<p>Koala</p>") Else Response.Write("<p>Not found.</p>") End If Response.Write("<p>Asynch operation completed.</p>") _completed = True _callback(Me) End Sub End Class
Lesson 1: Creating HTTP Handlers and HTTP Modules
ChAPTER 10
Sample of C# Code using System; using System.Web; using System.Threading; public class AsynchImageHandler : IHttpAsyncHandler { public bool IsReusable { get { return false; } } public AsynchImageHandler() { } public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData) { context.Response.Write("<p>BeginProcessRequest starting ...</p>"); ImageAsynchOperation imageOperation = new ImageAsynchOperation(cb, context, extraData); imageOperation.StartAsync(); context.Response.Write("<p>BeginProcessRequest queued ...</p>"); return imageOperation; } public void EndProcessRequest(IAsyncResult result) { //process any cleanup code here } public void ProcessRequest(HttpContext context) { throw new InvalidOperationException(); } } class ImageAsynchOperation : IAsyncResult { private bool _completed; private object _state; private AsyncCallback _callback; private HttpContext _context; public ImageAsynchOperation(AsyncCallback callback, HttpContext context, object state) { _callback = callback; _context = context; _state = state; _completed = false; }
562 ChAPTER 10
Writing and Working with HTTP Modules and Web Services
public bool IsCompleted { get { return _completed; } } public System.Threading.WaitHandle AsyncWaitHandle { get { return null; } } public object AsyncState { get { return _state; } } public bool CompletedSynchronously { get { return false; } } public void StartAsync() { ThreadPool.QueueUserWorkItem(new WaitCallback(StartAsyncOperation), null); } public void StartAsyncOperation(object workItemState) { HttpRequest Request = _context.Request; HttpResponse Response = _context.Response; if (Request.RawUrl.ToLower().Contains("jellyfish")) { Response.Write("<p>JellyFish</p>"); } else if (Request.RawUrl.ToLower().Contains("koala")) { Response.Write("<p>Koala</p>"); } else { Response.Write("<p>Not found.</p>"); } Response.Write("<p>Asynch operation completed.</p>"); _completed = true; _callback(this); } }
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