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The first thing to notice is that we caught the base Exception type, having just said that we almost never do that. We want to log every exception, and because we re rethrowing rather than eating it, we won t simply ignore exceptions we weren t expecting. After we execute our handler code (just writing the message to the console in this case), we use the throw keyword, without any object, to rethrow the exception we just caught. If you compile and run that, you 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. Log error: The PlatformWidth must be initialized to a value > 0.0 Error running turtle: The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block

Notice that we get the output from both of the exception handlers. That s not the only way to throw from a catch block: it is perfectly reasonable to throw any exception from our exception handler! We often do this to wrap up an exception that comes from our implementation in another exception type that is more appropriate for our context. The original exception is not thrown away, but stashed away in the InnerException property of the new one, as shown in Example 6-18.

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// 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); } running in the same direction MotorState.Running && MotorState.Running) || MotorState.Reversed && MotorState.Reversed))

Watchdog processors Polling Beacons RAID Nonstop processes Fault-tolerance Replication Backups Failover Hot swapping Key escrow Rebooting/restarting

// The motors are running in opposite directions, // so we don't move, we just rotate about the // center of the rig

RSSItem.prototype.toString = function() { var html = ""; html += "<strong>" + this.title + "</strong>"; html += "<br /><font style='font-size: xx-small'>" + this.publishedDate +"</font>" + "\n"; html += "<p>"+ this.description +"</p><hr/>"; return html; };

if ((LeftMotorState == RightMotorState == (LeftMotorState == RightMotorState == { Rotate(duration);

MotorState.Running && MotorState.Reversed) || MotorState.Reversed && MotorState.Running))

}

Under the Failure column of the table, we have listed various tools and techniques that can be used to prevent, detect, contain, and/or recover from failure of system components. Replication, for instance, helps contain failure of a storage device by creating copies of information on other storage devices. If a particular storage device fails due to, for example, a head crash, an earthquake, or an adversary who causes physical harm to it, the loss can be contained by retrieving the information from a storage device that replicates it.

} } catch (InvalidOperationException iox) { throw new Exception("Some problem with the turtle...", iox); } catch (Exception ex) { // Log here Console.WriteLine("Log message: " + ex.Message); // Rethrow throw; }

Notice how we passed the exception to be wrapped as a parameter to the new exception when we constructed it. Let s make a quick modification to the exception handler in Main to take advantage of this new feature (see Example 6-19).

static void Main(string[] args) { Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 }; ShowPosition(arthurTheTurtle); try {

// ... } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } catch (Exception e1) { // Loop through the inner exceptions, printing their messages Exception current = e1; while (current != null) { Console.WriteLine(current.Message); current = current.InnerException; } } finally

{ }

Even if a piece of information has been lost due to failure, it is possible to recover from the problem. Assume that a user has encrypted many files with her private key and that she stores her private key on a floppy disk. The floppy disk can fail for one reason or another, thereby making it potentially impossible to decrypt her files. We can recover from the situation by taking advantage of key escrow techniques to salvage the user s private key and any information that may have been encrypted with it.

Console.WriteLine("Waiting in the finally block"); Console.ReadKey();

From 8, you know that the first line of code should be used to load the component into the test harness, so we can add that as the first line of our block.

}

If we compile and run again, we can see the following output, including the messages from both the outer and inner exceptions:

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. Some problem with the turtle has occurred The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block

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