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requested. It does not provide the ability to initiate cancellation. That is provided by a separate class called CancellationTokenSource. The reason for splitting the discovery and control of cancellation across two types is that it would otherwise be impossible to provide a task with cancellation notifications without also granting that task the capability of initiating cancellation. CancellationTokenSource is a factory of cancellation tokens you ask it for a token and then pass that into the operation you want to be able to cancel. Example 16-23 is similar to Example 16-21, but it passes a cancellation token to StartNew, and then uses the source to cancel the operation if the user clicks a Cancel button.

These techniques compute short codes that are functions of the message being sent Alice can attach a short code to the message such that if the message or code are modified, Bob can determine whether they were tampered with However, while CRCs are sufficient to detect inadvertent communications failures, they are typically not good enough to deal with adversaries such as Mallory If Mallory knows that a CRC is being used, and she has no restrictions on how many bytes she can modify, she can also change the short code to match her modified message..

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Before you show your mashup to the world, you may want to make some minor quick changes. First, you need to choose the mashup to share from among your mashup creations shown by selecting Main Menu My Stuff Projects from the main screen. I ve chosen to work with the photo mashup we created earlier. Figure 6-1 shows all of the options available to you once you ve selected the mashup: Project Details, Edit, Tweak It, Delete, Share.

private CancellationTokenSource cancelSource; void OnButtonClick(object sender, RoutedEventArgs e) { cancelSource = new CancellationTokenSource(); TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); Task<string>.Factory.StartNew(GetData, cancelSource.Token) .ContinueWith((task) => UpdateUi(task.Result), uiScheduler);

}

void OnCancelClick(object sender, RoutedEventArgs e) { if (cancelSource != null) { cancelSource.Cancel(); } } string GetData() { WebClient w = new WebClient(); return w.DownloadString("http://oreilly.com/"); }

void UpdateUi(string info) { cancelSource = null; myTextBox.Text = info; }

The root cause of the vulnerability is that escaping was only applied to the new_password variable and not the uname variable. Quite likely, the programmer assumed that the former is an external input and hence must be escaped or validated, while the latter is safe because it was retrieved from the session (and ultimately from the database), which he might have considered a trusted source of data. As this example demonstrates, such corner-cutting can be extremely dangerous. As such, we recommend treating all parameters that are inserted into a query as potentially dangerous, and accordingly escaping or sanitizing them, no matter what their origin is. For example, the query that updates a user s password should be written as follows: new_passwd = request.getParameter("new_passwd"); uname = session.getUsername(); sql = "UPDATE USERS SET passwd='"+ escape(new_passwd) + "' WHERE uname='" + escape(uname) + "'";

In fact, cancellation isn t very effective in this example because this particular task consists of code that makes a single blocking method call Cancellation will usually do nothing here in practice the only situation in which it would have an effect is if the user managed to click Cancel before the task had even begun to execute This illustrates an important issue: cancellation is never forced it uses a cooperative approach, because the only alternative is killing the thread executing the work And while that would be possible, forcibly terminating threads tends to leave the process in an uncertain state it s usually impossible to know whether the thread you just zapped happened to be in the middle of modifying some shared state.

Since this leaves your program s integrity in doubt, the only thing you can safely do next is kill the whole program, which is a bit drastic So the cancellation model requires cooperation on the part of the task in question The only situation in which cancellation would have any effect in this particular example is if the user managed to click the Cancel button before the task had even begun If you have divided your work into numerous relatively short tasks, cancellation is more useful if you cancel tasks that have been queued up but not yet started, they will never run at all Tasks already in progress will continue to run, but if all your tasks are short, you won t have to wait long.

If you have long-running tasks, however, you will need to be able to detect cancellation and act on it if you want to handle cancellation swiftly This means you will have to arrange for the code you run as part of the tasks to have access to the cancellation token, and they must test the IsCancellationRequested property from time to time Cancellation isn t the only reason a task or set of tasks might stop before finishing things might be brought to a halt by exceptions..

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