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Clearly, wrapping an implementation-detail exception with something explicitly documented in our public contract can simplify the range of exception handlers you require. It also helps to encapsulate implementation details, as the exceptions you throw can be considered part of your contract. On the other hand, are there any disadvantages to throwing a wrapped exception (or indeed rethrowing the original exception explicitly, rather than implicitly with throw;) As programming tends to be a series of compromises, the answer is, as you might expect, yes. If you explicitly (re)throw an exception, the call stack in the exception handler starts at the new throw statement, losing the original context in the debugger (although you can still inspect it in the inner exception in the object browser). This makes debugging noticeably less productive. Because of this, you should consider carefully whether you need to wrap the exception, and always ensure that you implicitly (rather than explicitly) rethrow exceptions that you have caught and then wish to pass through.

Under the Lies column of the table, we list various security techniques that can be used to deal with both users and adversaries who attempt to lie to a system. Consider the use of digital signatures, which can prevent users from lying about statements that other users make. (Digital signatures are covered in more detail in 15, and more references are given in Section A.6.) A system that employs digital signatures may require users to digitally sign statements, thus preventing tampering with those statements. For example, assume that Alice wants to say Here is the answer to your query to Bob, but can only communicate with Bob through Mallory. Alice sends a message containing the answer and her digital signature on the message to Mallory. If Mallory attempts to modify Alice s message, Bob will notice that the digital signature does not match the message. Hence, digital signatures prevent Mallory from lying about what Alice said. If we are unable to prevent lies, we can design the system so that it can tolerate lies without affecting the correctness. To contain lies, a Byzantine agreement protocol can be used such that even if Mallory modifies a message that Alice wants to pass on to Bob, all the people involved in a decision can come to agreement. Byzantine agreement protocols can guarantee agreement so long as the number of people involved in the decision is greater than three times the number of liars, and all participants can communicate with one another without restriction.

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It is worth clarifying exactly when the finally block gets executed, under a few edge conditions. First, let s see what happens if we run our example application outside the debugger. If we do that (by pressing Ctrl-F5) we ll see that Windows Error Handling* materializes, and presents the user with an error dialog before we actually hit our finally block at all! It is like the runtime has inserted an extra catch block in our own (top-level) exception handler, rather than percolating up another level (and hence out of our scope, invoking the code in the finally block). And what happens when exceptions are thrown out of the exception handlers

Let s add a finally block to our RunFor method (see Example 6-20).

// Run the turtle for the specified duration public void RunFor(double duration) { try { // ... } catch (InvalidOperationException iox) { throw new Exception("Some problem with the turtle has occurred", iox); } catch (Exception ex) { // Log here Console.WriteLine("Log error: " + ex.Message); // Rethrow throw; } finally { Console.WriteLine("In the Turtle finally block"); } }

If you compile and run this code, you ll see the following output:

Tools such as firewalls and certificate revocation help a security designer defend against attempts at system infiltration. Firewalls are composed of one or more system components that prevent an adversary from breaking into computers within the perimeter of the firewall, such that data and computational resources available within the perimeter of the firewall cannot be used to an adversary s advantage. (Firewalls can also be used to prevent failure due to some types of DoS attacks.2) Once a system has been infiltrated, a technique such as certificate revocation may help us recover from the infiltration. If an adversary gets access to and compromises a user s private key after a system infiltration, certificate revocation allows us to break the association between that user and his public key, such that the private key becomes ineffective.

Arthur is at (0,0) and is pointing at angle 0.00 radians. In the Turtle finally block Arthur is at (0,10) and is pointing at angle 0.00 radians. In the Turtle finally block Some problem with the turtle has occurred The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block

So our finally block executes after the exception is thrown, but before it executes the exception handlers farther up the stack.

componentManager.add("t", "TechnoratiClass", "/content/components/icons/logo.png", "/content/components/icons/logo.png");

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