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You should consider very carefully whether you want to catch instances of the base Exception type. When you do that you are saying something bad happened, but I don t really know what it was. That degree of uncertainty tends to imply that the app has lost control of its own internal consistency. It is a common practice to catch Exception in your top-level exception handlers (e.g., in Main or, as we ll see later, in threading worker functions); and when you do, you normally need to terminate the application (or at least restart some subsystem). Of course, you might know perfectly well what might go wrong, and you re catching Exception because you can t be bothered to list the half dozen exception types you intend to handle in the same way. (Maybe F1 wasn t working so well that day and you couldn t inspect the docs; and someone was pressing you to check in your changes.) Beware! What happens if an implementation detail changes in another class on which you depend, such that a new exception is thrown Your handler will swallow it up and carry on. That might be OK, and your game of tic-tac-toe will continue happily. Or it might have unintended consequences, such as data loss or the start of WWIII. You just can t know in advance.

1. This appendix was written with input from Dr. Hector Garcia-Molina at Stanford University, and is based in part on work done toward Neil Daswani s Stanford PhD dissertation, Denial-of-Service Attacks and Commerce Infrastructure in Peer-to-Peer Networks. The FLI model suggested in this appendix was originally applied to identify that sufficient techniques for attack containment in peerto-peer networks were lacking, and the bulk of the dissertation focused on the development of such techniques, as opposed to the development of the FLI model itself.

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When the flow of control leaves the try block successfully, or the flow of control exits the last catch block if an exception occurred in the try block, the code in the finally block is executed. In other words, the code in the finally block is always executed, regardless of whether there was an exception. If you designed your exception-handling code nicely, you ll almost certainly use far more finally blocks than you do catch blocks. The finally block is a good place for cleaning up your resources, or winding back internal state if an error occurs, to ensure that your pre- and post conditions are still valid, whereas a catch block allows you to deal with an error condition you, as a client, understand in some way even if it is only to present a message to the user (as in this case). If we compile and run our code again, we ll see the following output:

Arthur is at (0,0) and is pointing at angle 0.00 radians. Arthur is at (0,10) and is pointing at angle 0.00 radians. Error running turtle: The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block...

Notice how the error-handling code is now consolidated neatly into clearly defined blocks, rather than scattered throughout our code, and we ve been able to cut down substantially on the number of points of return from our method.

At the moment, we re not handling any exceptions in our Turtle itself. Let s imagine that our Turtle is being provided to clients in a library, and we (as the leading vendors of turtle simulators) want the library to do some internal logging when errors occur: maybe we have an opt-in customer experience program that sends telemetry back to our team. We still want the errors to propagate up to the client for them to deal with; we just want to see them on the way past. C# gives us the ability to catch, and then transparently rethrow, an exception, as shown in Example 6-17.

Most tools and techniques that security designers have invented generally attempt to do the following: Prevent security concerns from ever becoming a problem by designing the system to make it theoretically or practically impossible for the problem to occur Detect the problem such that administrators, users, or other software can be made aware of the problem Contain the problem once it occurs such that the system can continue to function correctly even in light of the problem Recover from damage that has been caused by the problem after the problem has occurred Table A-1 shows several tools and techniques that can be used to prevent, detect, contain, and recover from failure, lies, and infiltration. Table A-1. The FLI Framework

// Run the turtle for the specified duration public void RunFor(double duration) { try { if (LeftMotorState == MotorState.Stopped && RightMotorState == MotorState.Stopped) { // If we are at a full stop, nothing will happen return; } // The motors are both // then we just drive if ((LeftMotorState == RightMotorState == (LeftMotorState == RightMotorState == { Drive(duration); } // // // if running in the same direction MotorState.Running && MotorState.Running) || MotorState.Reversed && MotorState.Reversed))

return resultArray; } } function RSSItem(title, link, description, source, sourceLink, author, tags, comments, commentRss, pubDate, mediaLink, mediaType, lat, lon) { this.title = title; this.link = link; this.description = description; this.source= source; this.sourceLink= sourceLink; this.author = author; this.tags= tags; this.comments = comments; this.commentRss = commentRss; this.publishedDate = pubDate; this.mediaLink = mediaLink; this.mediaType = mediaType; this.latitude = lat; this.longtitude = lon; }

{

The motors are running in opposite directions, so we don't move, we just rotate about the center of the rig ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Reversed) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Running)) Rotate(duration);

} } catch (Exception ex) { Console.WriteLine("Log message: " + ex.Message); // Rethrow throw;

}

Authentication Access control Non-repudiation Timestamping Digital signatures Fail-stop digital signatures

}

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