Hi.
Welcome back.
> I think there is still a way to get the digest. If you wrap
> the InputStream like this:
>
> public DataRecord addRecord(InputStream input) throws IOException {
> MessageDigest digest = MessageDigest.getInstance(DIGEST);
> InputStream input = new DigestInputStream(input, digest);
> ...
> }
> (...)
> I hope you get the idea. The second UPDATE statement will
> return 0 update count if a record with the same digest
> exists. I didn't set the LENGTH everywhere.
Yes, this could be a way, but I'm not yet convinced with the approach
It's a long procedure. So there are many possible points of failure.
Still, we do have a working impl of this idea. I'll upload it later.
> > [time] [user session] [GC session]
> > t0 node.setProperty(binary)
> > t1 gc.start
> > t2 gc.stop
> > t3 node.save
>
> Is this the problem? I didn't think about that so far... In
> my view it is rare because the garbage collection usually
> will take some time, and the time between node.setProperty
> and node.save is (hopefully) short.
Well, it may or may not be short, depending on the application.
> But it needs to be
> solved. I will write a test case.
There are some test cases in the attachment I uploaded to JCR-1154 (see
for example SimpleGCTest.testSaveRevert()). Of course they are synthetic
and use a synchronous GC, but I think they prove the point.
> A simple solution is to
> only delete records when the repository is stopped (or
> started). Obviously this is not a solution for long running
> repositories. Another idea is to keep transient large
I briefly mentioned this in a previous email, and the uploaded code has
a working version of a GC that collects on repository startup. To try
it, you have to set the garbageCollectorMode to "startup" in
repository.xml.
> binaries in a WeakReferenceHashMap, and before deleting check
> that the record is not in there.
>
> > > > We needed to make RepositoryImpl.getWorkspaceNames() public
> > it would be easier to just make them public.
> > Or at least export some of those methods thru an utils class.
>
> I will make it public.
Great!
> > Do you mind
> > if I send you a zip file with the implementations of the
> interfaces,
> > the tests, the configurations and parsers, and the
> initialization routines?
>
> There is no hurry, but please don't send it via email. The
> preferred way is to attach the code to the bug:
> http://issues.apache.org/jira/browse/JCR-1154 (you will be
> asked to 'Grant license to ASF for inclusion in ASF works').
It's done.
Once again I apologize for having to send the code as I did instead of
in a patch.
On a different topic, I want to discuss again another issue. When you
are marking (ie, updating nodes times) on a workspace, and then you
delete records older than the current cut-point, you risk deleting
records belonging to other workspaces. The solution I propose is simply
to mark the nodes of all the workspaces, and then do a single delete
operation for the entire data store (I don't know if this was always
your idea, but when we begun working on this, we assumed otherwise :( )
Regards,
Esteban Franqueiro
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