Maybe also read: http://blog.thetaphi.de/2012/02/is-your-indexreader-atomic-major.html A simple idea would be to wrap the NRT reader by SlowCompositeReaderWrapper, which has DocsEnum. If you don't do this for searching, the slowness does not matter.
Uwe ----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: Arjen van der Meijden [mailto:acmmail...@tweakers.net] > Sent: Friday, October 12, 2012 4:04 PM > To: java-user@lucene.apache.org > Subject: Testing whether a document is up-to-date in Lucene 4.0 > > Hello List, > > I'm currently trying to update my Lucene 3.6-application to 4.0. > > Most of it works (although your migration guide lacks a bit of aspects I had > to > figure out myself), but for one fairly large database I want to check whether > the Document in the Lucene database is already at the latest modification > time. > If so, I can continue to the next item on the list. > > So to do that, I index an additional field in the Document with the > modification > time and later retrieve that. > > With 3.6, I did this: > IndexReader reader = writer.getReader(); Term idTerm = new Term("idField, > "idText"); TermDocs termDocs = reader.termDocs(idTerm); > > if(termDocs.next()) > { > int docNum = termDocs.doc(); > Document doc = reader.document(docNum); > // etc > } > > It worked as far as I can tell, besides, it worked regardless of whether the > writer was actually started with a empty directory (on disk) or one that had > data in it. > > What is the correct way to implement something like the above procedure in > 4.0? The writer doesn't have a getReader() anymore and the IndexReader > doesn't have a termDocs()-method (and the docsEnum is only on specific > IndexReader's?). > > The "migration guide" isn't very clear on this and I wasn't really able to > find any > useful documentation on how the new reader/writer-stuff is actually to be > used... Did I overlook the documentation? > > And there are some additional things to consider, like the database may not > have been created yet (i.e. it may be empty at the moment of the above code). > And in my current code, I only have access to the IndexWriter, a reader or > searcher hasn't even been created yet. > > Best regards, > > Arjen > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
