| How does Eclipse decide which of the 2 Fragments of a Plugin to load ??? [message #74100] |
Fri, 06 October 2006 20:51  |
Eclipse User |
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Originally posted by: java.jago.gmail.com
Hi,
We know the Eclipse Plugin: org.eclipse.swt
On Linux this plugin has ONE of the two Fragments:
1. org.eclipse.swt.gtk.linux.xxx.jar
2. org.eclipse.swt.motif.linux.xxx.jar
Actually I can have an Eclipse-Distribution which has both fragments and
I choose between GTK and MOTIF with:
-ws gtk
-ws motif
in the eclipse.ini
My question: If I don't specify anything in eclipse.ini - how does
Eclipse decide which Fragment to use during startup ???
Because Eclipse chooses one of them if I don't specify it in eclipse.ini
- how ?
2nd Question: Can I somehow else (e.g. read it out from some
Eclipse-PreferenceStore instead of the command line or eclipse.ini) tell
Eclipse which Fragment it should take?
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| Re: How does Eclipse decide which of the 2 Fragments of a Plugin to load ??? [message #74169 is a reply to message #74134] |
Sat, 07 October 2006 18:15  |
| Eclipse User |
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Originally posted by: java.jago.gmail.com
Darryl L. Miles wrote:
> exquisitus wrote:
>
>> On Linux this plugin has ONE of the two Fragments:
>>
>> 1. org.eclipse.swt.gtk.linux.xxx.jar
>> 2. org.eclipse.swt.motif.linux.xxx.jar
>>
>>
>> Actually I can have an Eclipse-Distribution which has both fragments
>> and I choose between GTK and MOTIF with:
>>
>> -ws gtk
>> -ws motif
>>
>> in the eclipse.ini
>
>
>
> Inside each JAR which makes up each fragment lookup the
> Bundle-PlatformFilter option to the MANIFEST.MF.
>
> Eclipse-PlatformFilter: (& (osgi.ws=gtk) (osgi.os=linux) (osgi.arch=x86))
>
> http://help.eclipse.org/help31/index.jsp?topic=/org.eclipse. platform.doc.isv/reference/misc/bundle_manifest.html
I know that. osgi.ws is either gtk or motif. But that's not my problem.
I want to understand the descision process of Eclipse - how does Eclipse
choose gtk or motif If I don't specify anything ?
>
>
>
>> My question: If I don't specify anything in eclipse.ini - how does
>> Eclipse decide which Fragment to use during startup ???
>>
>> Because Eclipse chooses one of them if I don't specify it in
>> eclipse.ini - how ?
>
>
> Its all automatic. When you select in the INI file you are picking
> which is will use, then each contributing fragment uses
> Eclipse-PlatformFilter to select the correct contribution.
That's the point - if I don't write ANYTHING into eclipse.ini BUT still
it chooses one of the two fragments. My question is - how does Eclipse
decide that it chooses one instead of the other (again I didn't specify
anything in eclipse.ini)
Thx,
exq
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| Re: How does Eclipse decide which of the 2 Fragments of a Plugin to load ??? [message #74380 is a reply to message #74223] |
Tue, 10 October 2006 12:18 |
| Eclipse User |
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Originally posted by: jeff_mcaffer.REMOVE.ca.ibm.com
Sorry, no magic. The executable decides. There are simply different
launchers for linux gtk and linux motif (for a given architecture). Get
both drops and do a bytewise comparison. You can see the complete
code (and the two different prebuilt launchers) at
http://dev.eclipse.org/viewcvs/index.cgi/platform-launcher/
Jeff
Darryl L. Miles wrote:
> exquisitus wrote:
>> Darryl L. Miles wrote:
>> I know that. osgi.ws is either gtk or motif. But that's not my
>> problem. I want to understand the descision process of Eclipse - how
>> does Eclipse choose gtk or motif If I don't specify anything ?
>
> Ah I understand what you are asking now. Unfortunately I can not state
> categorically your answer.
>
>
> One thing that immediately springs to mind all the base platform
> distributions come as motif OR gtk1 OR gtk2. So there is a bias already
> to which widget set you get. Maybe this is to reduce distribution size
> and not for any incompatibility reasons.
>
>
> But if I were to implement auto-detection I'd start with querying the
> window manager.
>
> There is a mechanism that is part of the X.11 protocol, allowing two
> different processes to communicate through the X.11 server, passing
> queries though like events.
>
> I can't point any documentation and my X.11 protocol knowledge maybe a
> little rusty these days.
>
> Maybe: http://en.wikipedia.org/wiki/ICCCM
>
> You'd then need to find out what the defacto standard is for
> constructing events for each window manager and trying each in turn.
> Until you could establish which window manager the user is using and
> from that bias the default widget set selection from those that are
> available in your Eclipse installation.
>
>
>> That's the point - if I don't write ANYTHING into eclipse.ini BUT
>> still it chooses one of the two fragments. My question is - how does
>> Eclipse decide that it chooses one instead of the other (again I
>> didn't specify anything in eclipse.ini)
>
> You are really asking, "How does Eclipse set the value of the osgi.ws
> property?"
>
> You are not really asking, "How does Eclipse pick which fragment to
> load?" which is what your question sounds like to me.
>
>
> Darryl
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| Re: How does Eclipse decide which of the 2 Fragments of a Plugin to load ??? [message #74713 is a reply to message #74169] |
Wed, 11 October 2006 17:04 |
| Eclipse User |
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Originally posted by: dj_houghton.nospam.ca.ibm.com
The executable is compiled with the constants to pass in. If you are
starting directly from the JAR and nothing is specified, there is some
basic "guess" code in the EclipseEnvironmentInfo class in the
org.eclipse.osgi project.
exquisitus wrote:
> Darryl L. Miles wrote:
>> exquisitus wrote:
>>
>>> On Linux this plugin has ONE of the two Fragments:
>>>
>>> 1. org.eclipse.swt.gtk.linux.xxx.jar
>>> 2. org.eclipse.swt.motif.linux.xxx.jar
>>>
>>>
>>> Actually I can have an Eclipse-Distribution which has both fragments
>>> and I choose between GTK and MOTIF with:
>>>
>>> -ws gtk
>>> -ws motif
>>>
>>> in the eclipse.ini
>>
>>
>>
>> Inside each JAR which makes up each fragment lookup the
>> Bundle-PlatformFilter option to the MANIFEST.MF.
>>
>> Eclipse-PlatformFilter: (& (osgi.ws=gtk) (osgi.os=linux) (osgi.arch=x86))
>>
>> http://help.eclipse.org/help31/index.jsp?topic=/org.eclipse. platform.doc.isv/reference/misc/bundle_manifest.html
>
>
> I know that. osgi.ws is either gtk or motif. But that's not my problem.
> I want to understand the descision process of Eclipse - how does Eclipse
> choose gtk or motif If I don't specify anything ?
>
>>
>>
>>
>>> My question: If I don't specify anything in eclipse.ini - how does
>>> Eclipse decide which Fragment to use during startup ???
>>>
>>> Because Eclipse chooses one of them if I don't specify it in
>>> eclipse.ini - how ?
>>
>>
>> Its all automatic. When you select in the INI file you are picking
>> which is will use, then each contributing fragment uses
>> Eclipse-PlatformFilter to select the correct contribution.
>
> That's the point - if I don't write ANYTHING into eclipse.ini BUT still
> it chooses one of the two fragments. My question is - how does Eclipse
> decide that it chooses one instead of the other (again I didn't specify
> anything in eclipse.ini)
>
> Thx,
> exq
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