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From "Nicolas Toper" <nto...@gmail.com>
Subject Re: Google Summer of Code project for Jackrabbit
Date Sat, 27 May 2006 14:19:17 GMT
Thanks. I will start rewriting the design with all those elements included.
Thanks a lot for your help on this

nicolas

On 5/27/06, Stefan Guggisberg <stefan.guggisberg@gmail.com> wrote:
>
> On 5/26/06, Nicolas Toper <ntoper@gmail.com> wrote:
> > Hi Tobias,
> >
> > Thanks for your feedback.
> >
> > About the issue on jcr.Lock, if we do as you all suggested, I think I
> can
> > simply ignore them since I will be sure no transaction would be
> committed to
> > the PM while backuping. I will reconciliate later the PM with the
> changelogs
> > committed in between. Would this work fine?
> >
> > - what about inter-workspace operations?
> > What do you mean please?
> >
> >
> > - how do you backup the versions?
> > My initial idea is to fetch them all for each node and copy them in the
> > backup workspace (as in the ExamplesPages in the wiki). I was thinking
> of
> > adding a protected method to the Node object: setVersionHistory. It
> would be
> > accessible by JR "system" layer application. Is this idea good?
> >
> > It seems the more maintenable since I would be only in the application
> layer
> > of the versioning framework.
> >
> > Do you think I should work directly at the persistence layer storage? I
> > assumed the code would run faster but we would put more maintenance
> effort
> > in it.
> >
> > - how do you backup the namespaces?
> > I will simply store in the backup workspace all namespaces (since I will
> put
> > only one workspace at a time in the backup one, I will simply use
> > Workspace.getNamespaceRegistry().getPrefixes() and
> > Workspace.getNamespaceRegistry().getUris).
> >
> > With the following pseudocode
> >
> > String[] prefix = myWorkspace.getNamespaceRegistry().getPrefixes()
> > String[] uri = myWorkspace.getNamespaceRegistry().getUris()
> >
> > Is  prefix[0] the prefix for uri[0]?
>
> no, yu can't make any assumptions about the order. you'll have to
> get all prefixes and and for each prefix get the associated namespace uri
> (or vice cersa).
>
> >
> >
> >
> > - how do you backup the nodetypes?
> > One idea would be to use the dump method of the NodeTypeManager but it
> seems
> > kind of inelegant. Instead I think I would use getAllNodeTypes and
> iterate
> > on it to add them to the backup workspace.
>
> you shouldn't use the dump method. it's for internal debugging
> pruposes only and
> he output format may change at any time. keep in mind that the node types
> have
> global scope i.e. not per workspace. you could e.g. use or borrow code
> from
> jackrabbit's internal xml node type serialization format
> (NodeTypeWriter & NodeTypeReader).
>
> cheers
> stefan
>
> >
> > Nicolas
> >
> > On 5/26/06, Tobias Bocanegra <tobias.bocanegra@day.com> wrote:
> > >
> > > > There are two kinds of lock: the jcr.Lock and the
> > > > EDU.oswego.cs.dl.util.concurrent.*. The two are somewhat
> > > > not related. Am I correct?
> > > not at all. the locks i mentioned where jcr locks.
> > >
> > > > There are no issues with jcr.Lock (we can still read a node).
> > > there is one. the locks you need are 'deep locks'. i.e. the locks the
> > > node and the entire subtree. but you can only accquire a lock, if no
> > > one else locked a node. so you would not be able to bakckup until all
> > > locks are released. which may not be suiteable.
> > >
> > > other questions:
> > > - what about inter-workspace operations?
> > > - how do you backup the versions?
> > > - how do you backup the namespaces?
> > > - how do you backup the nodetypes?
> > >
> > > regards, toby
> > > --
> > > -----------------------------------------< tobias.bocanegra@day.com>---
> > > Tobias Bocanegra, Day Management AG, Barfuesserplatz 6, CH - 4001
> Basel
> > > T +41 61 226 98 98, F +41 61 226 98 97
> > > -----------------------------------------------< http://www.day.com>---
> > >
> >
> >
> >
> > --
> > a+
> > nico
> > My blog! http://www.deviant-abstraction.net !!
> >
> >
>



-- 
a+
Nico
my blog! http://www.deviant-abstraction.net !!

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