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Accessing Event Data. Objectives. After completing this lesson, you should be able to: Understand how objects are delivered to user algorithms. Retrieve objects from the event data store within an algorithm. Use relationships between objects. Specify event data input. - PowerPoint PPT Presentation
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Gaudi Framework Tutorial, 2001
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Accessing Event DataAccessing Event Data
4-2 Gaudi Framework Tutorial, 2001
ObjectivesObjectives
After completing this lesson, you should After completing this lesson, you should be able to:be able to:
• Understand how objects are delivered to user algorithms.
• Retrieve objects from the event data store within an algorithm.
• Use relationships between objects.
• Specify event data input.
After completing this lesson, you should After completing this lesson, you should be able to:be able to:
• Understand how objects are delivered to user algorithms.
• Retrieve objects from the event data store within an algorithm.
• Use relationships between objects.
• Specify event data input.
4-3 Gaudi Framework Tutorial, 2001
Event Data Reside In Data StoreEvent Data Reside In Data Store
TreeTree - similar to file - similar to file systemsystem
IdentificationIdentification by path by path”/Event/MCEvent/MCEcalHit””/Event/MCEvent/MCEcalHit”
ObjectsObjects or or
ContainersContainers of objects of objectsObjectVector<Type>ObjectVector<Type>
TreeTree - similar to file - similar to file systemsystem
IdentificationIdentification by path by path”/Event/MCEvent/MCEcalHit””/Event/MCEvent/MCEcalHit”
ObjectsObjects or or
ContainersContainers of objects of objectsObjectVector<Type>ObjectVector<Type>
4-4 Gaudi Framework Tutorial, 2001
Containers: ObjectVector<T>Containers: ObjectVector<T>
ObjectVector<MCParticle>*ObjectVector<MCParticle>* p; p;......ObjectVector<MCParticle>::iterator i;ObjectVector<MCParticle>::iterator i;for( i=p->begin(); i != p->end(); i++ ) {for( i=p->begin(); i != p->end(); i++ ) { log << MSG::INFO << (*i)->particleID().id(); log << MSG::INFO << (*i)->particleID().id();}}
ObjectVector<MCParticle>*ObjectVector<MCParticle>* p; p;......ObjectVector<MCParticle>::iterator i;ObjectVector<MCParticle>::iterator i;for( i=p->begin(); i != p->end(); i++ ) {for( i=p->begin(); i != p->end(); i++ ) { log << MSG::INFO << (*i)->particleID().id(); log << MSG::INFO << (*i)->particleID().id();}}
•Templated classTemplated class
•What you fill in are What you fill in are pointers to Tpointers to T
•Iteration like STL vectorIteration like STL vector
•Templated classTemplated class
•What you fill in are What you fill in are pointers to Tpointers to T
•Iteration like STL vectorIteration like STL vector
4-5 Gaudi Framework Tutorial, 2001
Understanding Data Stores: LoadingUnderstanding Data Stores: Loading
(5) Register
DataService
Algorithm
(1) retrieveObject(…)
Try to accessan object data
(2) Search in Store
Data Store
Unsuccessful ifrequested object is
not present
ConverterConverterConverterConverter
(4) Request creation
(3) Request load
PersistencyService
ConversionService
Request dispatcherObjy, SICB,
ROOT,..
4-6 Gaudi Framework Tutorial, 2001
CaveatsCaveats
Consider Objects on the store asConsider Objects on the store asREAD-ONLYREAD-ONLY
• Do not modify existing objects!
• Do not destroy existing objects!
Never, never delete an object which is Never, never delete an object which is registered to the storeregistered to the store
• It’s not yours!
• It will only screw up others!
Consider Objects on the store asConsider Objects on the store asREAD-ONLYREAD-ONLY
• Do not modify existing objects!
• Do not destroy existing objects!
Never, never delete an object which is Never, never delete an object which is registered to the storeregistered to the store
• It’s not yours!
• It will only screw up others!
4-7 Gaudi Framework Tutorial, 2001
Data Access In AlgorithmsData Access In Algorithms
• Objects can be accessed using a SmartDataPtr<class-type>
• Usage similar to a normal pointer
• Objects can be accessed using a SmartDataPtr<class-type>
• Usage similar to a normal pointer
SmartDataPtr<Event> evt(eventSvc(),“/Event”);SmartDataPtr<Event> evt(eventSvc(),“/Event”);
if ( !evt ) {if ( !evt ) { !error!!error!}}
SmartDataPtr<Event> evt(eventSvc(),“/Event”);SmartDataPtr<Event> evt(eventSvc(),“/Event”);
if ( !evt ) {if ( !evt ) { !error!!error!}}
Do not forget to check validityDo not forget to check validity
4-8 Gaudi Framework Tutorial, 2001
SmartDataPtr IngredientsSmartDataPtr Ingredients
SmartDataPtr<Event> SmartDataPtr<Event>
evt( eventSvc(), “/Event” );evt( eventSvc(), “/Event” );
SmartDataPtr<Event> SmartDataPtr<Event>
evt( eventSvc(), “/Event” );evt( eventSvc(), “/Event” );
• Template class type• Template class type
• Data store manager: Pointer to service• Data store manager: Pointer to service
• Item identifier: location of the object• Item identifier: location of the object
4-9 Gaudi Framework Tutorial, 2001
SmartDataPtr UsageSmartDataPtr Usage
SmartDataPtr<Event> evt(eventSvc(),“/Event”);SmartDataPtr<Event> evt(eventSvc(),“/Event”);
if ( evt ) {if ( evt ) {
MsgStream log(msgSvc(), name());MsgStream log(msgSvc(), name());
log << MSG::INFO << “Run#:” << evt->run()log << MSG::INFO << “Run#:” << evt->run()
<< endreq;<< endreq;
}}
SmartDataPtr<Event> evt(eventSvc(),“/Event”);SmartDataPtr<Event> evt(eventSvc(),“/Event”);
if ( evt ) {if ( evt ) {
MsgStream log(msgSvc(), name());MsgStream log(msgSvc(), name());
log << MSG::INFO << “Run#:” << evt->run()log << MSG::INFO << “Run#:” << evt->run()
<< endreq;<< endreq;
}}
This will trigger some actionThis will trigger some action
…this as well…this as well
• If invalid the evt->run() will cause access violation (core dump)
• If invalid the evt->run() will cause access violation (core dump)
4-10 Gaudi Framework Tutorial, 2001
Relationships Between ObjectsRelationships Between Objects
• Objects have relationships between each other
• Objects have relationships between each other
MCParticleMCParticle MCVertexMCVertex0..1 m_originMCVertex0..1 m_originMCVertex
0..n m_decayMCVertices0..n m_decayMCVertices
• Vertices are also connected to particles, but this we neglect here...
• Vertices are also connected to particles, but this we neglect here...
4-11 Gaudi Framework Tutorial, 2001
Implementing RelationshipsImplementing Relationships
• 0..1 Relationships can be implemented using a SmartRef<class-type>
• Usage similar to a normal pointer
• 0..n Relationships are implemented using a SmartRefVector<class-type>…an array of SmartRef<class-type>
• Allow for late data loading
• 0..1 Relationships can be implemented using a SmartRef<class-type>
• Usage similar to a normal pointer
• 0..n Relationships are implemented using a SmartRefVector<class-type>…an array of SmartRef<class-type>
• Allow for late data loading
4-12 Gaudi Framework Tutorial, 2001
Using These RelationshipsUsing These Relationships
class MCParticle {class MCParticle {
......
SmartRef<MCVertex> m_originVertex;SmartRef<MCVertex> m_originVertex;
......
MCVertex* originMCVertex() {MCVertex* originMCVertex() {
return m_originMCVertex;return m_originMCVertex;
}}
}; };
class MCParticle {class MCParticle {
......
SmartRef<MCVertex> m_originVertex;SmartRef<MCVertex> m_originVertex;
......
MCVertex* originMCVertex() {MCVertex* originMCVertex() {
return m_originMCVertex;return m_originMCVertex;
}}
}; };
…load data and trigger conversion
…load data and trigger conversion
See Doxygen code documentationSee Doxygen code documentation
4-13 Gaudi Framework Tutorial, 2001
Using SmartRef<type>Using SmartRef<type>
MCParticle* p = new MCParticle();MCParticle* p = new MCParticle();
SmartRef<MCParticle> ref;SmartRef<MCParticle> ref;
MCParticle* p = new MCParticle();MCParticle* p = new MCParticle();
SmartRef<MCParticle> ref;SmartRef<MCParticle> ref;
Assignment from raw pointerAssignment from raw pointer
Assignment to raw pointerAssignment to raw pointer
UsageUsage
HepLorentzVector& mom4 = p->fourMomentum();HepLorentzVector& mom4 = p->fourMomentum();
HepLorentzVector mom4_2 = ref->fourMomentum();HepLorentzVector mom4_2 = ref->fourMomentum();
HepLorentzVector& mom4 = p->fourMomentum();HepLorentzVector& mom4 = p->fourMomentum();
HepLorentzVector mom4_2 = ref->fourMomentum();HepLorentzVector mom4_2 = ref->fourMomentum();
ref = p;ref = p;ref = p;ref = p;
p = ref;p = ref;p = ref;p = ref;
4-14 Gaudi Framework Tutorial, 2001
Specify Event Data InputSpecify Event Data Input
EventSelector.Input = {“FILE=‘sicbmc.dat’”};[ {“Spec-1”, ... ,“Spec-n”} ]
EventSelector.Input = {“FILE=‘sicbmc.dat’”};[ {“Spec-1”, ... ,“Spec-n”} ]
• Event data input is specified in the job options
• “Spec” is an array of qualified strings:”KEY1=‘VALUE1’ … KEYn=‘VALUEn’”
• Event data input is specified in the job options
• “Spec” is an array of qualified strings:”KEY1=‘VALUE1’ … KEYn=‘VALUEn’”
4-15 Gaudi Framework Tutorial, 2001
Specify SICB Event InputSpecify SICB Event Input
Input Type KEY VALUE
SICB data file FILE =‘/afs/…/myfile.dat’
SICB data from JOBID JOBID =‘16835’
• Retrieve JobIDs from the bookkeeping web page.
• Our main data source is SICB output.
• Retrieve JobIDs from the bookkeeping web page.
• Our main data source is SICB output.
4-16 Gaudi Framework Tutorial, 2001
Specify Other Event InputSpecify Other Event Input
KEY VALUE EXAMPLE
DATAFILE <file-name> =‘/afs/…/myfile.dat’
TYPE <technology> =‘ROOT’
COLLECTION <tuple-name> =‘MyCollection’
SELECTION <SQL-preselection> =‘NTRACK>50’
FUNCTION <name> =‘MySelector’
4-17 Gaudi Framework Tutorial, 2001
Hands On: Print B0 DecaysHands On: Print B0 Decays
•Use particle property serviceUse particle property service– See “User Guide” chapter 12.5
•Retrieve MCParticles from event storeRetrieve MCParticles from event store– “/Event/MC/MCParticles”
•Filter out the BFilter out the B00 particles particles– Part. member particleID().id() is Geant 3 particle code
•For each BFor each B0 0 Loop over all decay vertices Loop over all decay vertices and print the decay particles and print the decay particles
– recursion ?
•Use particle property serviceUse particle property service– See “User Guide” chapter 12.5
•Retrieve MCParticles from event storeRetrieve MCParticles from event store– “/Event/MC/MCParticles”
•Filter out the BFilter out the B00 particles particles– Part. member particleID().id() is Geant 3 particle code
•For each BFor each B0 0 Loop over all decay vertices Loop over all decay vertices and print the decay particles and print the decay particles
– recursion ?
4-18 Gaudi Framework Tutorial, 2001
DecayTreeAlgorithm.cpp: Add HeadersDecayTreeAlgorithm.cpp: Add Headers
#include "CLHEP/Units/PhysicalConstants.h"#include "CLHEP/Units/PhysicalConstants.h"
#include "GaudiKernel/IParticlePropertySvc.h"#include "GaudiKernel/IParticlePropertySvc.h"
#include "GaudiKernel/ParticleProperty.h"#include "GaudiKernel/ParticleProperty.h"
#include "GaudiKernel/SmartDataPtr.h"#include "GaudiKernel/SmartDataPtr.h"
#include "LHCbEvent/MCParticle.h"#include "LHCbEvent/MCParticle.h"
#include "LHCbEvent/MCVertex.h"#include "LHCbEvent/MCVertex.h"
#include "CLHEP/Units/PhysicalConstants.h"#include "CLHEP/Units/PhysicalConstants.h"
#include "GaudiKernel/IParticlePropertySvc.h"#include "GaudiKernel/IParticlePropertySvc.h"
#include "GaudiKernel/ParticleProperty.h"#include "GaudiKernel/ParticleProperty.h"
#include "GaudiKernel/SmartDataPtr.h"#include "GaudiKernel/SmartDataPtr.h"
#include "LHCbEvent/MCParticle.h"#include "LHCbEvent/MCParticle.h"
#include "LHCbEvent/MCVertex.h"#include "LHCbEvent/MCVertex.h"
4-19 Gaudi Framework Tutorial, 2001
Using IParticlePropertySvcUsing IParticlePropertySvc...DecayTreeAlgorithm.h......DecayTreeAlgorithm.h...
IParticleProperySvc* m_ppSvc;IParticleProperySvc* m_ppSvc; std::string m_partName; std::string m_partName; long m_partID; long m_partID;
...DecayTreeAlgorithm::initialize()......DecayTreeAlgorithm::initialize()...
m_ppSvc = 0;m_ppSvc = 0; StatusCode sc = service("ParticlePropertySvc", m_ppSvc ); StatusCode sc = service("ParticlePropertySvc", m_ppSvc ); if( !sc.isSuccess() ) if( !sc.isSuccess() ) {{ // You have to handle the error!// You have to handle the error! }}
ParticleProperty* partProp = m_ppSvc->find( m_partName );ParticleProperty* partProp = m_ppSvc->find( m_partName ); if ( 0 == partProp ) { if ( 0 == partProp ) { // You have to handle the error!// You have to handle the error! }} m_partID = partProp->geantID(); m_partID = partProp->geantID();
...DecayTreeAlgorithm.h......DecayTreeAlgorithm.h...
IParticleProperySvc* m_ppSvc;IParticleProperySvc* m_ppSvc; std::string m_partName; std::string m_partName; long m_partID; long m_partID;
...DecayTreeAlgorithm::initialize()......DecayTreeAlgorithm::initialize()...
m_ppSvc = 0;m_ppSvc = 0; StatusCode sc = service("ParticlePropertySvc", m_ppSvc ); StatusCode sc = service("ParticlePropertySvc", m_ppSvc ); if( !sc.isSuccess() ) if( !sc.isSuccess() ) {{ // You have to handle the error!// You have to handle the error! }}
ParticleProperty* partProp = m_ppSvc->find( m_partName );ParticleProperty* partProp = m_ppSvc->find( m_partName ); if ( 0 == partProp ) { if ( 0 == partProp ) { // You have to handle the error!// You have to handle the error! }} m_partID = partProp->geantID(); m_partID = partProp->geantID();
4-20 Gaudi Framework Tutorial, 2001
Hands On: Retrieve MCParticlesHands On: Retrieve MCParticles
SmartDataPtr<MCParticleVector> SmartDataPtr<MCParticleVector> parts(eventSvc(), “/Event/MC/MCParticles”); parts(eventSvc(), “/Event/MC/MCParticles”);
if ( parts ) {if ( parts ) {
… … loop over particles …loop over particles …
}}
SmartDataPtr<MCParticleVector> SmartDataPtr<MCParticleVector> parts(eventSvc(), “/Event/MC/MCParticles”); parts(eventSvc(), “/Event/MC/MCParticles”);
if ( parts ) {if ( parts ) {
… … loop over particles …loop over particles …
}}
#include “GaudiKernel/SmartDataPtr.h”#include “GaudiKernel/SmartDataPtr.h”#include “GaudiKernel/SmartDataPtr.h”#include “GaudiKernel/SmartDataPtr.h”
4-21 Gaudi Framework Tutorial, 2001
Hands On: Loop Over MCParticlesHands On: Loop Over MCParticles
MCParticleVector::const_iterator i;MCParticleVector::const_iterator i;
for(i=parts->begin();i != parts->end(); i++ ) {for(i=parts->begin();i != parts->end(); i++ ) {
if ( (*i)->particleID().id() == m_partID ){if ( (*i)->particleID().id() == m_partID ){
printDecayTree( *i );printDecayTree( *i );
}}
}}
MCParticleVector::const_iterator i;MCParticleVector::const_iterator i;
for(i=parts->begin();i != parts->end(); i++ ) {for(i=parts->begin();i != parts->end(); i++ ) {
if ( (*i)->particleID().id() == m_partID ){if ( (*i)->particleID().id() == m_partID ){
printDecayTree( *i );printDecayTree( *i );
}}
}}
New member functionNew member function
4-22 Gaudi Framework Tutorial, 2001
Hands On: Print DecaysHands On: Print Decays
For each selected particle:For each selected particle:
• Loop over decay vertices
• Print all daughters
– If daughters have decay vertices
– recurse
• If you run out of time, just print someparticle property
For each selected particle:For each selected particle:
• Loop over decay vertices
• Print all daughters
– If daughters have decay vertices
– recurse
• If you run out of time, just print someparticle property
4-23 Gaudi Framework Tutorial, 2001
Loop Over Decay VerticesLoop Over Decay Vertices
const SmartRefVector<MCVertex>& decays = mother->decayMCVertices();const SmartRefVector<MCVertex>& decays = mother->decayMCVertices();
SmartRefVector<MCVertex>::const_iterator iv;SmartRefVector<MCVertex>::const_iterator iv;
for (iv = decays.begin(); iv != decays.end(); iv++ ) {for (iv = decays.begin(); iv != decays.end(); iv++ ) {
const SmartRefVector<MCParticle>& daughters = const SmartRefVector<MCParticle>& daughters =
(*iv)->daughterMCParticles();(*iv)->daughterMCParticles();
SmartRefVector<MCParticle>::const_iterator idau;SmartRefVector<MCParticle>::const_iterator idau;
for (idau=daughters.begin(); idau!=daughters.end(); idau++ ) {for (idau=daughters.begin(); idau!=daughters.end(); idau++ ) {
printDecayTree( 0, printDecayTree( 0, " | |", *idau );, *idau );
}}
}}
const SmartRefVector<MCVertex>& decays = mother->decayMCVertices();const SmartRefVector<MCVertex>& decays = mother->decayMCVertices();
SmartRefVector<MCVertex>::const_iterator iv;SmartRefVector<MCVertex>::const_iterator iv;
for (iv = decays.begin(); iv != decays.end(); iv++ ) {for (iv = decays.begin(); iv != decays.end(); iv++ ) {
const SmartRefVector<MCParticle>& daughters = const SmartRefVector<MCParticle>& daughters =
(*iv)->daughterMCParticles();(*iv)->daughterMCParticles();
SmartRefVector<MCParticle>::const_iterator idau;SmartRefVector<MCParticle>::const_iterator idau;
for (idau=daughters.begin(); idau!=daughters.end(); idau++ ) {for (idau=daughters.begin(); idau!=daughters.end(); idau++ ) {
printDecayTree( 0, printDecayTree( 0, " | |", *idau );, *idau );
}}
}}
4-24 Gaudi Framework Tutorial, 2001
printDecayTreeprintDecayTreevoid DecayTreeAlgorithm::printDecayTree(long depth, const std::string& prefix, const MCParticle* mother) { MsgStream log(msgSvc(), name()); const SmartRefVector<MCVertex>& decays = mother->decayMCVertices(); ParticleProperty* p = m_ppSvc->find( mother->particleID().id() ); log << MSG::INFO << depth << prefix.substr(0, prefix.length()-1) << "+--->" << p->particle() << endreq;
if ( depth < m_depth ) { SmartRefVector<MCVertex>::const_iterator iv; for ( iv = decays.begin(); iv != decays.end(); iv++ ) { const SmartRefVector<MCParticle>& daughters = (*iv)->daughterMCParticles(); SmartRefVector<MCParticle>::const_iterator idau; for ( idau = daughters.begin(); idau != daughters.end(); idau++ ) { printDecayTree( depth+1, prefix+" |", *idau ); } } }}
void DecayTreeAlgorithm::printDecayTree(long depth, const std::string& prefix, const MCParticle* mother) { MsgStream log(msgSvc(), name()); const SmartRefVector<MCVertex>& decays = mother->decayMCVertices(); ParticleProperty* p = m_ppSvc->find( mother->particleID().id() ); log << MSG::INFO << depth << prefix.substr(0, prefix.length()-1) << "+--->" << p->particle() << endreq;
if ( depth < m_depth ) { SmartRefVector<MCVertex>::const_iterator iv; for ( iv = decays.begin(); iv != decays.end(); iv++ ) { const SmartRefVector<MCParticle>& daughters = (*iv)->daughterMCParticles(); SmartRefVector<MCParticle>::const_iterator idau; for ( idau = daughters.begin(); idau != daughters.end(); idau++ ) { printDecayTree( depth+1, prefix+" |", *idau ); } } }}
