.NET/Java PDF, Tiff, Barcode SDK Library

In this function, we re simply creating a few HTML elements to display the user details, and we re adding them to the box element. Using jQuery in these examples has allowed us to be productive and expressive, while not worrying about cross-browser JavaScript quirks and incompatibilities. The resulting code is more durable and more concise. A good JavaScript library, such as jQuery, is a must in any web developer s tool belt.

microsoft reporting services qr code, ssrs upc-a, vb.net 2d barcode generator, ssrs ean 128, ssrs ean 13, ssrs pdf 417, c# remove text from pdf, find and replace text in pdf using itextsharp c#, ssrs fixed data matrix, c# remove text from pdf,

but when contention occurs it will just sit in a loop checking and checking and checking again to see if the lock has become free yet the thread will consume CPU cycles while it does this. The spin in SpinLock refers to the code spinning around in this loop waiting for the lock. That might sound like an awful idea compared to the nice power-efficient wait state that a thread can enter into when blocking on a monitor. And often, it s exactly as bad an idea as it sounds. The majority of the time you won t want to use SpinLock. But it offers one possible advantage: because it never falls back onto the OS scheduler, it s a more lightweight construct than a monitor, and so if you very rarely encounter contention for a particular lock, it might be cheaper. (And if the contention does occur but is extremely short-lived, it s possible that on a multicore system the cost of spinning very briefly might actually be lower than the cost of getting the scheduler involved. In general, spinlock contention on a single-processor system is bad, although the

Drupal has a number of theme settings that can be configured through the admin section. Navigate to appearance and click the settings tab to view global settings, or click the settings link next to a theme to view individual theme settings. Themes display a number of page elements that can be toggled on or off, such as a logo, site name, search box, and main menu (see Figure 3-30 for full list). These settings can be configured at the global level or overridden at the individual theme level. As a note, the search box, main menu, and secondary menu can be displayed as a block, a page element, or both at the same time.

lock on a single-processor machine.)

nature, as it can live inside other objects, rather than needing its own space on the heap. Of course, this also means you need to be careful not to assign a SpinLock into a local variable, because you d end up making a copy, and locking that copy would not be useful.

All of the pieces are now tied together, and we can see the results of our work. In figure 12.8 you can see the Ajax call at the bottom (in the Firebug window), and the page gives us the information we need without any page redirects or refreshes. How refreshing!

Never use SpinLock without comparative performance tests: test all the performance metrics you care about using ordinary monitors and compare that against how the same test suite works when you replace a particular lock with a SpinLock, and consider switching only if the tests demonstrate a clear benefit. If you don t have a test infrastructure capable of verifying that you meet all of your performance requirements, or if you don t have quantitative, clearly specified performance requirements, your project is not ready for SpinLock.

For some reason, a lot of developers just love to be armchair performance tuners. An astounding amount of time and effort is wasted on mailing lists, on web forums, and in internal company meetings on heated debates over which constructs are theoretically faster than others. Sadly, empirical testing of any kind rarely enters into the equation in such discussions. If someone tries to claim by logical argument alone that a particular technique is faster, be highly suspicious of her claims. Exotic and specialized synchronization primitives such as SpinLock seem to bring out the worst in these people. (And that s the main reason we re even mentioning it sooner or later you ll have to deal with someone who has become obsessed with finding a way to use SpinLock.) Testing and measurement is the only reliable path to performance.

The ASP.NET MVC Framework ships with a couple of Ajax helpers that you can use to quickly create Ajax behaviors on your site. Just as the HTML helpers are accessed with <%= Html.SomeHelper() %>, the Ajax helpers are accessed via <%= Ajax.SomeHelper() %>. To utilize these helpers in your application, you must reference MicrosoftAjax.js and MicrosoftMvcAjax.js, which are included in the project template in the /scripts folder. It s safe to reference them in combination with jQuery. The first Ajax helper that we ll examine is Ajax.ActionLink. This helper provides the ability to invoke an action asynchronously and update an element on the page. The usage is simple: