September 2008
Intermediate to advanced
660 pages
20h 32m
English
Content preview from Programming Flex 3Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Caching the Framework
Flash Player 9, Update 3 (which is Flash Player 9.0.115) has a feature called Flash Player cache. Flash Player cache isn’t entirely dissimilar from typical browser caching in that it is capable of storing persistent local copies of files and using the local copies instead of remote copies upon subsequent requests. However, Flash Player cache is significantly different from browser cache in two key ways:
Flash Player cache works only with signed runtime shared libraries (must be signed by Adobe).
Flash Player cache works across domains. That means you can download a signed runtime shared library from www.a.com and when an .swf from www.b.com needs that same signed runtime shared library, it will have access to it.
Flash Player cache is a way in which you can dramatically reduce the size of a Flex .swf file. Keep in mind that this does not necessarily mean you’re reducing the number of bytes a user must download to access the application correctly. If the user doesn’t already have the necessary signed runtime shared library files (.swz files) in cache, he will still have to download those. In fact, because the runtime shared libraries are the entire Flex framework instead of only the parts required by the specific application, the total download can potentially be greater than if the framework was statically linked and compiled in the application .swf file. However, if the user does have the required .swz files in cache, all he will have to download is the .swf ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.