java qr code generator example Performance in Java

Creator QR Code in Java Performance

Performance
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We introduced the practice of profiling, both by using JavaScript libraries and using a native profiler tool such as the Venkman debugger. Profiling helps us to understand where the bottlenecks in our system are, and it also can be used to provide a baseline against which we can measure change. By comparing profiler results before and after a code change, we can assess its impact on the overall execution speed of our application. We also looked at the issue of memory management and showed how to avoid introducing memory leaks into our code, either through generic bad practices or by running afoul of specific issues with the DOM or Internet Explorer. We saw how to measure memory consumption using the tools available to Windows and UNIX operating systems. Finally, our benchmark example showed the real impact that attention to these details can have on our code. The role of design patterns was crucial in identifying where the great divergence in memory footprint lay and how to manage it. Performance is an elusive goal there is always room for a little more optimization and we have to adopt a pragmatic approach to getting good enough performance from our Ajax apps. This chapter should have provided you with the tools needed to do just that.
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8.6 Resources
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We looked at a few useful development tools in this chapter.
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Drip, the Internet Explorer leak detector was created by Joel Webber. His blog, http://jgwebber.blogspot.com/2005/05/drip-ie-leak-detector.html, is no longer available, but Drip can currently be found at www.outofhanwell.com/ieleak/. Venkman Profiler: www.svendtofte.com/code/learning_venkman/advanced. php#profiling Process Explorer: www.sysinternals.com
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The official line on Internet Explorer leakiness, and some workarounds, is presented here: http://msdn.microsoft.com/library/default.asp url=/library/en-us/ IETechCol/dnwebgen/ie_leak_patterns.asp. Richard Cornford s suggested solution can be found on Google Groups by searching for cornford javascript fixCircleRefs() the full URL is too long to print out here.
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Part 4 Ajax by example
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he five complete Ajax projects in this section demonstrate the full process of building compelling interactive elements for your web applications. In each case, we ve developed a straightforward example, step by step, so you can see how it works. We ve then refactored the code so that the example can be dropped into your own projects easily. The examples cover the full spectrum of what Ajax can do, from enhancing form elements to developing complete portal solutions, communicating to both your own server-side processes and to standard Internet services. We ve deliberately chosen a mixture of popular server-side programming languages in which to implement the server-side code, so you ll find a medley of PHP, Java, VB.Net and C# in this section. The downloadable code available from the website will contain multiple implementations of the sever-side back-end for each chapter. Have fun!
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Quick Response Code Creation In C#.NET
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Dynamic double combo
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Recognizing Data Matrix 2d Barcode In VS .NET
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This chapter covers
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The client-side JavaScript The server side in VB .NET Data exchange format Refactoring into a reusable component Dynamic select boxes
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If you have ever shopped for a new shirt online, you may have run into the following problem. You pick the shirt size from one drop-down list, and from the next drop-down list you select the color. You then submit the form and get the message in giant red letters: Sorry, that item is not in stock. Frustration sets in as you have to hit the back button or click a link to select a new color. With Ajax we can eliminate that frustration. We can link the selection lists together, and when our user selects the size option from the first list, all of the available colors for that shirt can be populated to the second list directly from the database without the user having to refresh the whole page. People have been linking two or more selection lists together to perform this action with either hard-coded JavaScript arrays or server-side postbacks, but now with Ajax we have a better way.
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