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From "Oleg Khaschansky" <oleg.v.khaschan...@gmail.com>
Subject Re: [classlib][awt] headless support (was: Re: [snapshot] Questions about next snapshot...)
Date Wed, 25 Oct 2006 15:30:57 GMT
> Right, that is my question too.  I've seen the general description at
> the URL Oleg sent, it's hardly a spec tho'.
I don't think that spec for this exists.

Another document on this is [1]. It describes what can and what cannot
be done in headless mode. But we also have the list of methods which
throw HeadlessException (from the API spec).

> Presumably it is easier for us to find all the methods that are declared
> to throw a HeadlessException, and put in the isHeadless() test right
> now, so we can have a compliant headless implementation before the GUI
> is completed?
This is only a part of a task. We may also need to guard native
initialization code which depends on system configuration with
isHeadless checks (just skip it in headless mode). And, probably,
provide an alternative simplified implementation for some awt code
which could be called in headless mode to prevent from falling into
hardware-dependent native code (e.g. for linux we need to exclude all
xlib calls, right?).

[1] http://java.sun.com/developer/technicalArticles/J2SE/Desktop/headless/

On 10/25/06, Tim Ellison <t.p.ellison@gmail.com> wrote:
> Martin Cordova wrote:
> > Oleg, I just read it, does this mean that all methods that don't need
> > to throw the special Headless exception, are ready to work in headless
> > mode?
>
> Right, that is my question too.  I've seen the general description at
> the URL Oleg sent, it's hardly a spec tho'.
>
> Presumably it is easier for us to find all the methods that are declared
> to throw a HeadlessException, and put in the isHeadless() test right
> now, so we can have a compliant headless implementation before the GUI
> is completed?
>
> > If so, we are just a step away for supporting headless?
>
> well we still have to get all the imageIO, print, font and other code
> working that is required in headless mode.
>
> Regards,
> Tim
>
> --
>
> Tim Ellison (t.p.ellison@gmail.com)
>
>

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