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RE: [gmf-dev] Is it necessary to use shared instance ofMEditingDomain?
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Hi, Christian!
My idea was to use own instance of
MEditingDomain for each GMF diagram exactly to simplify
resource-related code. For example, easily save all the resources
associated with the current diagram just by saving all the resources loaded into
the current MEditingDomain. But, once I tried to create diagram with new
instance of MEditingDomain I found a problems with toolbar tools (you've
mentioned as possible "snag" ;-)).
So, my question is: do you think it is
reasonable to create own instance of MEditingDomain for each diagram (not
only to solve my problems, but due to some other possible problems with undo,
etc)? In case you agree with me, I can try to switch GMF to use one editing
domain per diagram and submit corresponding requests to runtime. If not, I'll
probably try to solve my problems in another way and ask you some more questions
about another aspects of MEditingDomain + resources in it.
______________
Alex Shatalin
Hi, Alex,
The intent of the MEditingDomain is that you can create
any number of instances to manage resources independently of other diagrams,
editors, applications, whatever. This works at the basic level of
programmatic manipulation of EMF resources. You will run into snags,
however, in other areas of the GMF run-time such as the AbstractModelCommand
and some of the diagram code, which assume that all work is done in the shared
MEditingDomain. I think that some people have managed to work around
this to some degree, but I do not know the details.
For now, perhaps it is best to code defensively,
without assuming a shared instance, and to apply that assumption externally to
your code. We have plans afoot to make it easier to use multiple
MEditingDomains, and when that's done you should be able to re-work your code
with little effort.
Cheers,
Christian
Christian W. Damus
Aurora
Core Model Services
IBM Rational Software
Tel: (613)
591-7937
-- If at first you do succeed, try to
hide your astonishment.
"Alexander Shatalin"
<Alexander.Shatalin@xxxxxxxxxxx>
Sent by: gmf-dev-bounces@xxxxxxxxxxx
10/20/2005 07:21 AM
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Subject
| [gmf-dev] Is it
necessary to use shared instance of
MEditingDomain? |
|
Hi!
I'm
sorry for probably stupid question, but I've just started
with IBM runtime,
so I'm not a guru in this area. ;-)
During an implementation of possibility to store user
domain
model instances in a separate resource, I came to the question: is
it
necessary to share single instance of MEditingDomain across all
the
diagrams? I suppose, that it was intentionally implemented this way,
and
probably, somebody from IBM team could enumerate an arguments for
it.
______________
Alex Shatalin
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