Towards a Framework for Organized Analysis

1. Andreas Morsch Weekly Offline Meeting 7/6/2007 Towards a Framework forOrganized Analysis

2. Who manages the common output objects AliAODEvent, AOD Tree and output file? • What has to be called when • SlaveBegin • AliAODEvent constructor • Open file • AOD tree constructor • ExecuteAnalysis • AOD tree fill • AliAODEvent Clear • Terminate • WriteTree • Close File

3. AliAnalysisManager AliAODEvent AliAnalysisManagerAOD AliVEvent AliAnalysisManager AliAODEvent AliVirtualEventHandler AliAnalysisManager AliAODHandler AliAODEvent

4. AliVirtualEventHandler class AliVirtualEventHandler : public TNamed { public: AliVirtualEventHandler(); AliVirtualEventHandler(const char* name, const char* title); virtual ~AliVirtualEventHandler(); virtual void SetOutputFileName(char* fname) = 0; virtual char* GetOutputFileName() = 0; virtual Bool_t InitIO(Option_t* opt) = 0; virtual Bool_t Fill() = 0; virtual Bool_t Terminate() = 0; virtual Bool_t TerminateIO() = 0; private : ClassDef(AliVirtualEventHandler, 1); };

5. AliAODHandler class AliAODHandler : public AliVirtualEventHandler { public: AliAODHandler(); AliAODHandler(const char* name, const char* title); virtual ~AliAODHandler(); // Implements the interface virtual void SetOutputFileName(char* fname) {fName = fname;} virtual char* GetOutputFileName() {return fName;} virtual Bool_t InitIO(Option_t* option); virtual Bool_t Fill(); virtual Bool_t Terminate(); virtual Bool_t TerminateIO(); virtual Bool_t Notify() {return kTRUE;} // AOD Specific AliAODEvent* GetAOD() {return fAODEvent;} TTree* GetTree() {return fTreeA;} void CreateTree(); void FillTree(); void AddAODtoTreeUserInfo(); };

6. User Code void AliAnalysisTaskJets::CreateOutputObjects() { // Create the output container // // Default AOD AliAODHandler* handler = (AliAODHandler*) ((AliAnalysisManager::GetAnalysisManager())->GetEventHandler()); fAOD = handler->GetAOD(); fTreeA = handler->GetTree(); fJetFinder->ConnectAOD(fAOD); }

7. Configuration // Make the analysis manager // AliAODHandler* aodHandler = new AliAODHandler(); aodHandler->SetOutputFileName("aod.root"); AliAnalysisManager *mgr = new AliAnalysisManager(‘Analysis Train’, ‘Test’); mgr->SetEventHandler(aodHandler); AliAnalysisDataContainer *coutput1 = mgr->CreateContainer(‘AODTree’, TTree::Class(), AliAnalysisManager::kOutputContainer, "default");

8. Testing • Many tasks per train • Collect code from friendly users • Default output + user output • All execution modes • Local • Proof (file merging needed) • Grid (M. Gheata)

9. Next steps • AOD as input • Event mixing use case • Using input event handler ?