I noticed a number of places in Mozilla code where setTimeout-like
functionality is needed, but DOM window.setTimeout is not available
because the code runs in a non-DOM context like a JSM. In a few places
we had created pure-JS implementations of window.setTimeout to solve
this problem.
With Gavin's encouragement, I extracted one of these into a standalone
JSM file, to make it easier to share. If you need to call setTimeout
without a DOM window, you can now use Timer.jsm:
https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Timer.jsm
This offers two main benefits over just using nsITimer directly: it
makes it easier to re-use code written for use in a DOM window, and it
addresses this common nsITimer garbage collection problem:
http://www.joshmatthews.net/blog/2011/03/nsitimer-anti-pattern/
For more details, see bug 840360. Thank you to Chris Jones who wrote
the original code, and to several other people who gave feedback on it.
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