GLAST TDS Event Model
This document describes GLAST Event Model for the Transient Data Store (TDS).
The Gaudi Transient Data Store is a mechanism to share data among multiple algorithms. An algorithm may take as input any data that is currently available on the TDS and then generate new data that is then stored on the TDS for other algorithms to use. Consider it a shared memory mechanism - similar in function to FORTRAN common blocks.
All data is stored within the TDS: Monte Carlo (MC), digitization detector data, and reconstruction data.
Accessing data from the TDS
When accessing data from the TDS, it is recommended that one use the EventModel constant that is predefined for each path within the TDS, see the EventModel.cxx file. Thus, if our tree structure is modified in the future - your code will be unaffected. For example:
SmartDataPtr<McParticleCol> myVar(eventSvc( ), EventModel::MC::McParticleCol);
| Object Name |
EventModel Constant Access |
Description |
| Event |
EventModel::EventHeader |
Event Header: run, id, time |
| McParticleCol |
EventModel::MC::McParticleCol |
Collection of MC Particles |
| McPositionHitCol |
EventModel::MC::McPositionHitsCol |
Collection of MC PositionHits |
| McIntegratingHitCol |
EventModel::MC::McIntegratingHitsCol |
Collection of MC IntegratingHits |
| AcdDigi |
EventModel::Digi::AcdDigiCol |
digitized ACD detector data: IDs, PHAs |
| CalDigiCol |
EventModel::Digi::CalDigiCol |
digitized CAL detector data |
| TkrDigiCol |
EventModel::Digi::TkrDigiCol |
digitized TKR detector data |
| AcdRecon |
EventModel::AcdRecon::Event |
ACD reconstruction data |
| CalXtalRecCol |
EventModel::CalRecon::CalXtalRecCol |
ObjectVector of CAL crystal reconstructed data |
| CalClusterCol |
EventModel::CalRecon::CalClusterCol |
Vector of all clusters found by CAL recon. |
| TkrClusterCol |
EventModel::TkrRecon::TkrClusterCol |
Container of clustered silicon strip hits in the Tracker. |
| TkrPatCandCol |
EventModel::TkrRecon::TkrPatCandCol |
Vector of pattern recognition track candidates. |
| TkrFitTrackCol |
EventModel::TkrRecon::TkrFitTrackCol |
Vector of fit tracks. |
| TkrVertexCol |
EventModel::TkrRecon::TkrVertexCol |
Vector of "vertices." |
The ntuple data is also stored on the TDS. Accessing that data is different from obtaining other data. Please see this page for details.
Owned by: Heather Kelly
| Last updated by: Chuck Patterson
06/24/2005 |
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