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Re: should one single search be able to encompass several databases?
I wasn't going to generally announce this for a week or so when the next
release is ready...but since its relevant to the discussion. The
"Info provider" modules are basically rewritten back-ends, instances of
which may be "mounted" at arbitary points in the DIT. For my purposes
I'm mainly interested in cacheing the info...but this need not be the case.
Anyway the current release is available as an RPM at:
http://www.gridpp.ac.uk/download/development/RPMS/openldap-ftree-2.0.11ft0.7.2-1.i386.rpm
with the source in the SRPMS directory.
cheers,
Alex
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back-ftree slapd module
=======================
The back-ftree backend slapd module is designed to be a flexible
memory-based directory-like tree structure. The tree structure is initiated
when the slapd server is started by reading a flat-file in ldif format. The
objects so read are stored internally in openldap's internal format and the
application of filters etc use the build-in matching functions. Because
it is memory based, access speed is maximised.
By default the LDAP entries are constructed directly from the ldif entries.
However, its also possible to define ldif entries which correspond to
actually correspond to "information providers". In this case the
"stub" ldif entry actually provides the configuration information
for the provider. For example, the ldif entry:
dn: hn=localhost, dc=gridpp, o=grid
objectclass: shellstub
dynamictype: shell
shelltype: simple
script: /opt/ftree-demos/loads.pl
suffix: hn=localhost, dc=localdomain, o=grid
frequency: 10
Tells the server that the entries, rooted at "hn=localhost, dc=gridpp, o=grid" are to be
provided by an info provider of type "shell" which runs the shell /opt/ftree-demos/loads.pl.
Updates are requested every 10 sec.
The info providers are implemented as additional dynamically loaded modules
which may be loaded into the server (currently at start time), and may contain their
own threads of execution.
Four info provider modules are currently provided:
back_ftree_shell which provides support for legacy shell scripts compatible with
the standard back_shell module, also "simple" shell scripts which
simple produce a ldif listing on their stdout
back_ftree_cache which allows one to cache the entries provided by another server.
back_ftree_logfile which builds a LDAP structure from the contents of a logfile
back_ftree_perl which preloads a perl interpreter, so calls to perl modules are
intrinsically fast. (think mod_perl).
-------------------------------------------------------------------------------
| |
| Dr. Alex Martin |
| Physics Department, |
| e-Mail: a.j.martin@qmw.ac.uk Queen Mary, University of London, |
| Phone : +44-(0)20-7882-5033 Mile End Road, |
| Fax : +44-(0)20-8981-9465 London, UK E1 4NS |
| |
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