[news.eclipse.modeling] Re: How to make sure that a resource is written

[roland.brand@xxxxxxxx (Roland Brand)]

Hi Ed

Ed Merks wrote:
> Please post EMF questions to the EMF newsgroup, which I've added to the 
> "to" list of the reply.  More comments below.

Oops, sorry.


> Roland Brand wrote:
> > Hi all
> >
> > I'm trying to read an EMF resource. In case it does not exist, I 
> > create a new one, add some default content to it and call save().
> >
> > Now I've got the problem, that after the save(), the resource might 
> > still not exist and an IOException is thrown when I try to load the 
> > resource. It seems like a race condition to me, since it never occurs 
> > in the debugger. So I helped myself with the following loop:
> >
> > while 
> > (!resource.getResourceSet().getURIConverter().exists(resource.getURI(), 
> > Collections.EMPTY_MAP))
> > {
> >    System.out.println("save it");
> >    resource.save(saveOptions);
> > }
> >
> > It is now clear, that save() does not guarantee the existence of the 
> > resource after it has been called. I have seen up to 30 executions of 
> > the while-loop until the resource finally existed.
> What's the value of the URI?

The URI is archive:file://home/rbrand/model.zip!/semantic.xmi

As you can probably guess, I have a Zipfile containing GMF resources: a 
semantic model and a notation model.

> > My question is: how can I make sure, that the new resource really 
> > exists? The while-loop does not look like a nice solution to me. Or am 
> > I misunderstanding something?
> I wouldn't expect this kind of behavior...
> > Thanks for your helpful posts ;-)
> >
> > Roland