Re: [Classpathx-discuss] Getting newsgroup list in real-time

[Cedric Hyppolite]

Le 5 mai 06 à 14:33, Chris Burdess a écrit :

> Cedric Hyppolite wrote:
> > Le 5 mai 06 à 14:12, Chris Burdess a écrit :
> > > Cedric Hyppolite wrote:
> > > > I am trying to list all newsgroup available from a server. I  
> > > > found that the API
> > > > does not allow the listing of groups before the complete list is  
> > > > retrieved.
> > > >
> > > > There is no getFolders() method on the NNTPRootFolder that would  
> > > > allow the listing of currently
> > > > known newgroups. For Mail the listing of folder is not that  
> > > > long, but for NewsGroups it takes a while.
> > > >
> > > > I am missing something obvious ?
> > > >
> > > > How could I get this information? Adding a ListListener  
> > > > parameter to the list() method, or a getFolders() method which  
> > > > could return the result of the current/last listing.
> > >
> > > Does listSubscribed do what you want?
> >
> > I don't think so. listSubscribed is for listing folders/newsgroup  
> > that we know exists (from newsrc file) from a previous listing or  
> > session.
> >
> > What I want is to get the list of newsgroup in real time so the  
> > user does not wait 10 minutes before being able to browse the list  
> > of groups available on a server,
> > and starting making up a list of groups to subscribe to.
>
> You want an asynchronous I/O interface to NNTP? That's a completely  
> different architecture from either JavaMail or the inetlib NNTP  
> client.

I don't want an asynchronous IO interface to NNTP, I want a listener  
call as the internal implementation iterates over the lines giving  
the newsgroup names.
It seems like the GroupIterator is reading the response from the  
server line by line and creating folder from each answer.

If that's right, I guess that a listener call on each iteration of  
this GroupIterator whould give the enable the listing of groups  
before all of them are received.

Cedric


> Something like Twisted might be what you're looking for.
> --
> 犬 Chris Burdess
>   "They that can give up essential liberty to obtain a little safety
>   deserve neither liberty nor safety." - Benjamin Franklin