Just to continue the lock discussion....I don't think jcr:Locks are an issue on the backup operation, however they are an issue on the restore. What will happen on a restore when a lock is held on a node being restored? Will the node be replaced, the lock reapplied and the isms updated so InvalidItemStateExceptions will be thrown on any subsequent saves prior to a re-get?
David "Nicolas Toper" <[EMAIL PROTECTED]> 05/27/2006 10:19 AM Please respond to dev@jackrabbit.apache.org To dev@jackrabbit.apache.org cc Subject Re: Google Summer of Code project for Jackrabbit 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 <[EMAIL PROTECTED]> wrote: > > On 5/26/06, Nicolas Toper <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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 > > > -- > > > -----------------------------------------< [EMAIL PROTECTED]>--- > > > 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 !!
