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When is a AdapterFactory loaded? [message #480601]

Mon, 17 August 2009 20:01

Christoph HÃ¶ger

Messages: 40
Registered: July 2009

Member

Hi,

I am using a custom AdapterFactory to map IResources to my custom model.
That works fine - except for the startup, the factory is simply not
asked. Is that normal or is there a way to load that factory earlier?

regards

Christoph

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Re: When is a AdapterFactory loaded? [message #480727 is a reply to message #480601]

Tue, 18 August 2009 10:34

Philipp Kursawe

Messages: 135
Registered: July 2009

Senior Member

Christoph Höger wrote:
> Hi,
>
> I am using a custom AdapterFactory to map IResources to my custom model.
> That works fine - except for the startup, the factory is simply not
> asked. Is that normal or is there a way to load that factory earlier?
If you created the AdapterFactory using the extension point it is only
instantiated when the plugin is active.
This has bitten many others before. Why the behaviour is like that - I
forgot. Paul Webster might know.
Make sure the bundle is started or use Declarative Service to add a
programmatic adapter factory. I almost never use the declarative adapter
factories anymore. Too much pain.

Phil

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Re: When is a AdapterFactory loaded? [message #481392 is a reply to message #480727]

Thu, 20 August 2009 18:57

Christoph HÃ¶ger

Messages: 40
Registered: July 2009

Member

Am 18.08.2009 12:34, schrieb Philipp Kursawe:
> Christoph Höger wrote:
>> Hi,
>>
>> I am using a custom AdapterFactory to map IResources to my custom
>> model. That works fine - except for the startup, the factory is simply
>> not asked. Is that normal or is there a way to load that factory earlier?
> If you created the AdapterFactory using the extension point it is only
> instantiated when the plugin is active.
> This has bitten many others before. Why the behaviour is like that - I
> forgot. Paul Webster might know.
> Make sure the bundle is started or use Declarative Service to add a
> programmatic adapter factory. I almost never use the declarative adapter
> factories anymore. Too much pain.

Ah. Thanks. I'll keep that in mind (worked around for now).

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Re: When is a AdapterFactory loaded? [message #483352 is a reply to message #480727]

Tue, 01 September 2009 09:54

Daniel KrÃ¼gler

Messages: 853
Registered: July 2009

Senior Member

Philipp Kursawe wrote:
> Christoph Höger wrote:
>> Hi,
>>
>> I am using a custom AdapterFactory to map IResources to my custom
>> model. That works fine - except for the startup, the factory is simply
>> not asked. Is that normal or is there a way to load that factory earlier?
> If you created the AdapterFactory using the extension point it is only
> instantiated when the plugin is active.
> This has bitten many others before. Why the behaviour is like that - I
> forgot. Paul Webster might know.
> Make sure the bundle is started or use Declarative Service to add a
> programmatic adapter factory. I almost never use the declarative adapter
> factories anymore. Too much pain.

I agree regarding the pain. There is a very old issue (#82973) that
one might consider to vote for - I still don't loose the hope ;-)

IMO it would be the right direction to go, if ext.pt.
org.eclipse.core.runtime.adapters would provide an optional boolean
flag (e.g. "force") which could be set to true to ensure that -
if not loaded - the corresponding contributing plug-in will be loaded,
similar to the effect of IAdapterManager#loadAdapter.

I don't understand the hesitations to support this request. It would
be perfectly backward compatible (the default value would be false).

Greetings from Bremen,

Daniel Krügler

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Re: When is a AdapterFactory loaded? [message #483381 is a reply to message #483352]

Tue, 01 September 2009 12:17

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Daniel KrÃ¼gler wrote on Tue, 01 September 2009 05:54

I don't understand the hesitations to support this request. It would
be perfectly backward compatible (the default value would be false).

The reason centers on the 2 dev groups, I'll call them producers and consumers Smile

Producers want their stuff to work right, and in the shortest amount of code. That's why people still instantiate IActions (an anonymous inner class where you can set the label/icon, enabled state, and the execution code). Yes, it's tight coupling, but it's easy to do.

Consumers (especially large ones) want to control when things are loaded (I heard of one large consumer where a tweak to load a subcomponent on first access instead of on startup shaved 11 seconds off of the startup time).

If the producer gets to say "I'll always load so I'm 100% correct" the consumer can never say "well, I'll defer that until I need it".

Right now the workbench gives some powers to consumers and some to producers.

But that's the reason why default behaviour like that is *not* added without lots of discussion and dissension ... the goals are actually at odds, and the part of eclipse that's the framework (and has to support both cases) needs a lot of careful consideration.

PW

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
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