Hi Lenya devs,
currently, the only available LinkManager implementation is the
ContentLinkManager. When you ask it to return all links that point to a
particular document, it parses all (!) other documents in the same area
and extracts the links based on the link XPaths of the resource type. As
you can imagine that can take a while, especially in large publications.
I expericened this with the docu publication. If you want to decativate
a page, you can fetch a coffee in the meantime, and even drink it (at
least if it's an espresso).
In a discussion on the Jackrabbit mailing list, Bertrand Delacretaz
suggested to extract all links that are contained in a document before
saving it, and store them in the meta data. Now, since all Lenya meta
data are indexed, this link list can be used for a Lucene search. The
query looks like this (special characters have to be escaped):
\{http\://apache.org/lenya/metadata/link/1.0\}outgoingLinks:lenya\-document\:1aca68c0\-0243\-11dd\-881a\-f3cc793eb58e\*
The name of the meta data field is
{http://apache.org/lenya/metadata/link/1.0}outgoingLinks
The term value is
lenya-document:1aca68c0-0243-11dd-881a-f3cc793eb58e*
Note the wildcard at the end of the term value. It includes URLs with an
attached language or publication parameter. The link manager uses some
post-search checks to verify that only the actually linked documents are
listed (conforming to the declared LinkResolver implementation).
With the MetaDataLinkManager, the deactivate screen appears virtually
immediately. I guess this scales nicely with large number of documents
(as good as Lucene scales). If you have an index spanning multiple
publications, you can even detect links from other publications.
I have the MetaDataLinkManager in my local sandbox. It depends on the
search API which I have posted on the user list. If you want to take a
closer look at the classes, I can upload a ZIP somewhere, or maybe I can
extract a patch.
Replacing the ContentLinkManager with the MetaDataLinkManager would
require to "touch" all documents so that the links are extracted (they
are indexed automatically when the session is committed).
Is anybody interested in this feature?
-- Andreas
--
Andreas Hartmann, CTO
BeCompany GmbH
http://www.becompany.ch
Tel.: +41 (0) 43 818 57 01
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