talk_190298

Minutes of the meeting on the 30.4.99

Present : Dieter Schlatter, Giuseppe Bagliesi, Vitaliano Ciulli, Yuanning Gao, Alain Bonissent, Paolo Palazzi, Dante Borillo, Guenther Dissertori, Dirk Duellmann

Paolo Palazzi gave an overview of the JADE project. The goals of the project are to (1) experiment JAVA as a language suitable for HEP analysis, and (2) provide an environment for HEP analysis based on JAVA and JAS. The approach is to take ALPHA as a model of functionality, to use JAS as analysis framework and to interface to the ALEPH DST. He first outlined the developer environment which was built by Dante Borillo. The next things to be done are to provide JAVA classes which can be used in JAS and a special DIM (Data interface module) to be able to read in ALEPH data. The JAVA classes should be very similar to the classes which are designed for the analysis part of ALPHA++.
Guenther Dissertori showed the upgrade plans for the objy database. The LHC++ software of release 99a which we need is there, in particular Objectivity5.1 and HepODBMS. So the immediate plans are to run the upgrade program of Objy to upgrade the existing database from version 4 to 5.1. He proposes some more changes to the ddl : Every Objy-specific naming should be replaced by the ODBMS naming, eg. ooVArray should go to HepVarray or something like that. Dirk will provide a correct wrapper for that. Next clustering directives should be build into the base classes, in order to be able to use the clustering hint goodies. And finally the HepNamingTree should be used, so that the database can be browsed as a file system, eg.
```
         /aleph/data/97_1/Runs/....
                        /Events_#1/...
                   /97_2/..
               /mc/....
```
etc. There are iterators over directories. Dirk however proposes for the events and the banks to iterate over the pointers, whcih is more efficient. The upgrade should be done within the next weeks, so that we have a stable version of the database when our summerstudents arrive. As it came out from the discussion, nobody of the possible newcomers has time to take care of it. So Guenther will do the upgrade work, with the help of Dirk.

Guenther Dissertori
Fri May 7 11:20:38 MET DST 1999