Overview

1
Overview

• Methodology
• Design
• Architecture
• Outline of future work
• Ideas for discussion

2
Methodology

• How to write a program to solve
• Traditionally design a data structure
• COMMON Block
• something like a C struct

3
Use Case driven

• Abstractions are modeled by entities
• Identify their properties
• Ask questions
• Study their interplay
• Follows the design course by J.Deacon
• Leads to an object-oriented solution
• Not the only way ...

4
How to describe the problem ?

• Not so easy
• Trick
• Physicist is UML Actor
• Asks the questions to solve the use cases
• Later the Actor is replaced by...
• a main algorithm object
• a strategy object (see later)

5
Entities

• Lifetime
• For the whole job
• For one event
• Temporary
• Entities
• specific for problem domain
• functional abstraction, not physical objects

6
Over the whole job ...
7
How to implement a Radiator ?
8
For one event ...
9
a Track Entity
10
TrackSegment
Radiator

• Has a length
• Emits photons

Track
11
What happened to the Extrapolation ?
RichTrack
Track
TrackExtrapolation
RichTrackSegment
12
more complicated in detail ...
13
GAUDI Algorithms
14
Architecture

• Group of entities form a components
• An assembly of components forms the algorithm
• Components are ...
• separated by well defined interfaces
• assembled at run time
• development of the components is de-coupled

15
Components
16
UML Components
17
Components ...

• Are GAUDI sub-algorithms
• Profits from the flexible instantiation mechanism
• Can use all GAUDI services
• Have their proper interfaces
• A down cast exposes the interface
• Are controlled by a main algorithm
• Instantiation
• Controls the interplay

18
Detector Implementation

• Initialization .
• Create instance of entities
• Evaluation
• Expose their interface
• Do the real work
• Database update ?
• Versions
• ASCII file based
• Detector geometry database based

19
Event Model

• EventReader
• Controlling entity
• For each event
• Read data store and create structure
• Delete structure and write data store
• Versions
• Reconstruction MC, smeared MC, Rec Data
• Simulation

20
Strategy Object

• Main Algorithm object prepares context
• EventModel
• Detector Structure
• Delegates control to the strategy object
• Versions
• Reconstruction, Global Likelihood, Other
• Simulation

21
Monitor Objects

• As strategy object
• Read only access to event model
• More then one allowed
• Versions
• Histogramming
• Detailed Log files
• Display

22
Outline of work

• Consolidation of OO structure
• Interleaved with functional update
• Better use of GAUDI features
• Detector database
• CDF to XML converter
• Catch up with SICB
• Many topics
• Priorities have to be set

23
Catch up ...

• Adapt likelihood for background
• Tracking inefficiencies
• Charged particle interactions in detector
• Geometry update
• ASCII file
• Photon detector implementation
• probably still generic for some time
• Other Algorithms ...

24
Discussion

• Detector data
• Association to MC truth
• How to store final results ?
• Iteration of the algorithm ???
• Temporary results could be stored
• GEANT4