Wrapping Persistent ROOT Framework Objects in an Object-Oriented Mediator System

In this thesis we develop a wrapper for scientific data stored in ROOT files using Amos II, a functional DBMS. ROOT is an object-oriented framework for representing high-energy physics data. We investigate possible ways to represent ROOT C++ objects in a functional data model and propose a simple and fast mapping method. We define a schema to represent ROOT object storage containers, objects and their meta-data for Amos II users. The wrapper implements interface functions for data retrieval using the ROOT library. Amos II users can define SQL-like queries over data stored in ROOT files without dealing with levels of abstraction below Amos II. Athena is the common control framework for simulation, reconstruction, and analysis of scientific data collected in ATLAS experiment carried out in CERN. We investigate what is required to manage Analysis Object Data (AOD) files created using Athena. As a result, we show that our wrapper is capable of efficiently reading AOD files without having the ATLAS Athena framework installed. Supervisor: Ruslan Fomkin Examiner: prof. Tore Risch 1 The authors can be contacted by email