[GemStone-Smalltalk] Getting started with Gembuilder for VW

Annick Fron via GemStone-Smalltalk gemstone-smalltalk at lists.gemtalksystems.com
Wed Nov 21 06:54:54 PST 2018

Hi Martin,

	This was helpful.
	But my main issue is that I have the same classes both in UserGlobals and UserClasses, and sometimes with a different version.
	If I user the right click menu « create in Gs » on a class in a browser, it creates it in UserClasses. But if I define connectors, it adds the same class name in UserGlobals.
	Besides, all my classes have a namespace, e.g. Compet.Competition.

	What is the difference between:

	GBSM evaluate: ‘MyClass myInstances’ 
	MyNamespace.MyClass myInstances performOnGsServer: #myInstances 

	Best regards


> Le 21 nov. 2018 à 01:50, Martin McClure <martin.mcclure at gemtalksystems.com> a écrit :
> On 11/20/18 10:37 AM, Annick Fron via GemStone-Smalltalk wrote:
>> Hi,
>> 	I have succeeded to connect 2 PCs using the same database, and I have defined classes in the base. Now I have a class inst var as a connector, and I am able to store one object in the server. But using the same connect with updateST, I am not able to get it back.
>> 	Any idea how to debug ?
>> 	Best regards
>> 	Annick
> Hi Annick,
> Connectors have some limitiations. Class instvar connectors in
> particular have the limitation that changes in the variable's value
> cannot be automatically detected by GBS. Connectors for class variables
> don't have this limitiation.
> However, especially when getting started, you may find it easier to not
> use connectors for your data roots.
> Use connectors for your classes (you can do without them sometimes, but
> they're easy and reliable. Then, after login, you can "manually"
> replicate your data roots.
> Say you have on both client and server the class MyClass, with class
> instVar myInstances, and accessor methods for that variable.
> Since you have a class connector for MyClass, once you're logged in the
> client MyClass is automatically mapped to the server MyClass.
> To initialize the instance variable on the server, you could do this on
> the client:
> MyClass performOnGsServer: #myInstances: withArguments: (Array with:
> OrderedCollection new).
> then commit.
> Thereafter, after each login, you can have the client initialize itself
> from the server with:
> MyClass myInstances: (MyClass performOnGsServer: #myInstances).
> After that, the client and server OrderedCollections (in this example;
> could be just about any object) are mapped to each other and will
> automatically synchronize their state.
> I hope this has been helpful, and that I haven't completely
> misunderstood what you're trying to do.
> If you get things working as I've suggested above, then you can
> experiment with Connectors if you like. And keep asking questions! GBS
> is very general-purpose, and it can take a bit to learn what the more
> successful patterns of use are.
> Regards,
> -Martin

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