Subj : Re: Making a "Singleton" Chrome Extension
To   : netscape.public.mozilla.jseng,netscape.public.mozilla.xpcom
From : Brendan Eich
Date : Tue Jul 20 2004 09:17 am

Brendan Eich wrote:
> Kyle wrote:
> 
>> I'm writing a chrome extension that currently creates an instance of
>> an object when an overlay is loaded. This currently means that a new
>> instance is created for every window that contains the overlay.
>>
>> I would prefer to be able to create a single instance of the object
>> when the Mozilla starts, and make reference to this instance when
>> other windows are created. This also means that I would like to keep
>> the instance alive after the overlay that created it has been
>> destroyed.
>>
>> This should just be a simple Singleton model. Is there some type of
>> registry I can use to store and retrieve a reference to this object
>> each time the overlay loads, and does anyone have any examples of a
>> similar implementation? Thanks you, 
> 
> 
> You want to write an XPCOM component in JS, and call it via XPConnect. 
> Many examples exist.  See 
> http://lxr.mozilla.org/mozilla/source/xpcom/sample/nsSample.js, 
> http://lxr.mozilla.org/mozilla/source/toolkit/mozapps/update/src/nsBackgroundUpdateService.js, 
> http://lxr.mozilla.org/mozilla/source/toolkit/mozapps/extensions/src/nsExtensionManager.js.in, 
> and others 
> (http://lxr.mozilla.org/mozilla/search?string=createInstance%3A).


So the better newsgroup, I think, is m.xpcom.  Cross-posting with 
followup-to: set.

/be

.