Text Layout Framework memory leak

Cameron — Mon, 27 Apr 2009 06:49:51 +0000

Shortly before I flew to Abu Dhabi for Cityscape, I found a memory leak in the AIR application I’d been developing for the past few months. As with most memory leaks it only became apparent after several hours of usage, and given the application had to run at least 10 hours a day, was a serious problem.

Thankfully, Flex Builder has a profiler tool built-in, and leaving my application running for hours in the profiler revealed the rapid accumulation of instances of a mystery class TextAccImpl, which it’s package structure revealed was part of the new Text Layout Framework.

This was more problematic than you may imagine, as not only is the TLF still in beta, but was an integral part of my application as it gave us the ability to switch seamlessly between English and Arabic.

After spending time tweaking my code to check if I was using the API incorrectly, it became apparent it was a bug in TLF itself. Googling didn’t find anything, so I resorted to the official TLF blog, where I noticed a post announcing they were releasing weekly builds to their Adobe Labs download page.

As I was compiling against the version of TLF that came with the Flex 4 MAX Preview, I decided to upgrade by adding the latest weekly build (411 at that time) as an external library to my project. After making the necessary changes to my code to reflect the API changes they’d made, I left my application running in the profiler overnight and to my relief the bug had been fixed.

If anyone is experiencing dramatic degradation of performance over time after adding the TLF to your application, I’d recommend you upgrade to the latest weekly build.

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Text Layout Framework memory leak