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Passing messages between processes exposes the system to two types of risk. The first is that a third party will intercept a message containing sensitive data. The second is that a third party will falsify a message or alter a valid one before it is delivered to its intended recipient. Both of these risks present potentially serious threats, ranging from loss of system reliability to loss of your competitive advantage. To minimize these risks, communication between processes should be encrypted when appropriate. The cryptographic techniques described in section B.3 are used to do just that.

Compared to unmanaged C++, this means that less code is generated by the compiler and less code has to execute at run time: your application s performance is better Over the years, I ve used exception handling in different languages, different operating systems, and different CPU architectures In each case, exception handling is implemented differently Each implementation has its pros and cons with respect to performance Some implementations compile exception handling constructs directly into a method, while other implementations store information related to exception handling in a data table associated with the method this table is accessed only if an exception is thrown Some compilers can t inline methods that contain exception handlers, and some compilers won t enregister variables if the method contains exception handlers The point is that you can t determine how much additional overhead using exception handling adds to an application.

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In the managed world, it s even more difficult to tell because your assembly s code can run on any platform that supports the NET Framework So the code produced by the JIT compiler to manage exception handling when your assembly is running on an x86 machine will be very different than the code produced by the JIT compiler when your code is running on an IA64 processor or the code produced by the NET Compact Framework s JIT compiler Actually, I ve been able to test some of my own code with a few different JIT compilers that Microsoft has internally, and the difference in performance that I ve observed has been quite dramatic and surprising The point is that you must test your code on the various platforms that you expect your users to run on and make changes accordingly.

@Stateful public class PlaceOrderBean implements PlaceOrder { @Resource(name="jms/QueueConnectionFactory") private ConnectionFactory connectionFactory; @Resource(name="jms/OrderBillingQueue") private Destination billingQueue; ... @Remove public Long confirmOrder() { Order order = new Order(); order.setBidderId(bidderId); order.setItems(items);

Again, I wouldn t worry about the performance of using exception handling; as I ve said, the benefits far outweigh any negative performance impact If you re interested in seeing how exception handling impacts the performance of your code, you can use PerfMonexe or the System Monitor ActiveX control that comes with Windows NT 4, Windows 2000, Windows XP, and the Windows NET Server product family The screen in Figure 18 1 shows the exception related counters that get installed when the NET Framework is installed..

When we ran the Fix My Network Wizard on our network, which appeared to be working as expected, we got the Potential Network Issues page shown in Figure 19-39.

when a problem occurs or to signal a problem within our own code to outside code that may be using our API. As always, we begin with an example. Take a look at listing 3.32.

In this statement, the first argument is the SQL query passed to the local database to be executed. The second argument is an array of JavaScript values that can be used in the query. The third argument, dataHandler, is a callback function to handle the response. Finally, the last argument, errorHandler, is a callback for an error handling function. In this chapter we presented only some of the more popular features of HTML5, which contains lots of cool features beyond the highlights we presented here. Furthermore, HTML5 is a dynamic standard. New features are constantly invented, with implementation following at an amazingly fast pace. For a current snapshot of the latest features supported in QtWebKit please look at the latest supported standards page at: http://trac.webkit.org/wiki/QtWebKitSupportedStandards.

In 4, you used a special array called ARGV. ARGV is an array automatically created by the Ruby interpreter that contains the parameters passed to the Ruby program (whether on the command line or by other means). For example, say you created a script called argvtest.rb: p ARGV You could run it like so: ruby argvtest.rb these are command line parameters

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