The Go4 eventloop framework: analysis steps GSI Online Offline Object Oriented The Go4 eventloop framework: analysis steps J. Adamczewski, M. Al-Turany, D. Bertini, H.G.Essel, S.Linev ROOT 2002 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Contents Go4 analysis framework concepts Event base classes Analysis steps Eventloop actions Example of user analysis GUI control of analysis 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Go4 Framework Concepts Based on standard ROOT system Online and Offline Framework Batch mode and interactive mode ( GUI) may run same analysis Any user analysis may be adopted Go4 provides interfaces (base classes) to „plug-in“ user event classes and analysis Go4 implements all general services 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Event Base Classes TGo4EventElement: Event structure (input and output event) TGo4EventSource: Fills event structure with data TGo4EventStore: Stores event structure TGo4EventProcessor: Converts input event into output event; subclass of TGo4EventSource TGo4EventFactory: Defines the user implementations of all the above at initialization 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Implemented Services GSI standard DAQ (Mbs) Complex event structures „toolbox“: TGo4CompositeEvent, ... < see Denis Bertini‘s talk Root I/O : TGo4FileSource, TGo4FileStore : wraps 1 TTree in 1 TFile TGo4BackStore : 1 TTree in memory only ( <- online TTree::Draw() ) both can handle TGo4CompositeEvent 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Analysis Framework TGo4Analysis baseclass: Analysis setup (chain of analysis steps) Object organization, dynamic histograms Implicit / explicit event loop Virtual methods to be defined in user analysis subclass TGo4AnalysisStep: defines one stage of the analysis, implements event classes User designs own subclass of TGo4Analysis 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Analysis Step Previous Step TGo4EventFactory TGo4FileSource TGo4EventServerFactory CreateEventSource() CreateEventStore() TUserEvent1 TUserEventProcessor TUserEventFactory_1 CreateInputEvent() CreateEventProcessor() CreateOutputEvent() TUserEvent2 Next Step TGo4FileStore 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Analysis Framework TGo4Analysis TGo4AnalysisStep * TGo4EventFactory register objects TUserAnalysis TUserAnalysis() ~TUserAnalysis() UserEventFunc() UserPreLoop() UserPostLoop() TUserEventFactory_1 TUserEventFactory_n 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

Eventloop Actions UserPreLoop Step1 ProcessAnalysisSteps StepN fill event get event store event histograming Step1 ProcessAnalysisSteps init objects StepN UserEventFunc ? other Analysis histograming HYDRA ProcessDynamicList TTree registry UserPostLoop online TTree::Draw() reset objects 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

Example Analysis: Euroball Step1 Step2 event processors elements sources analysis framework event factories 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

Analysis Setup Control 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

Using Go4 Components Go4Analysis Go4GUI Go4Analysis Steps Go4Events connect analysis client Go4Analysis Go4GUI subclassing TGo4Analysis subclassing TGo4Analysis, register objects (TTree, TH1) Go4Analysis Steps user event factories Go4Events user event subclasses other analysis framework (HADES) Go4Event I/O (MBS, .lmd) 15-Oct-2002 J. Adamczewski - http://go4.gsi.de

J. Adamczewski - http://go4.gsi.de Summary Go4 Analysis framework is flexible Event base classes define interface Framework services + user subclasses Analysis steps: common set up (gui control) uses Root data management / object streamer Go4 Version 2.0 ready 15-Oct-2002 J. Adamczewski - http://go4.gsi.de