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Data Access in Dual-use Tools

Data Access in Dual-use Tools. PC. Data Access via TEvent/TStore. TEvent : combines basic functionality of StoreGate , TSelector , OutputStream TStore : transient-only data store Not sure why two very similar APIs

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Data Access in Dual-use Tools

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  1. Data Access inDual-use Tools PC

  2. Data Access via TEvent/TStore TEvent: combines basic functionality of StoreGate, TSelector, OutputStream TStore: transient-only data store • Not sure why two very similar APIs • Objects can be shared(copied?) between the two, allowing to save TStore objects • How about merging them?

  3. Private Stores • Use Cases: • Train Carriages • One store per carriage • Systematics Variations • Multiple object versions • (HLT ROIs and Trigger Steps) • Event Views • Insulate execution of Algorithms/Tools • Slice event context • Allow both shared and context-specific data objects • Single context switch

  4. Common Theme: Inverted Lookup Photons Photons Electrons Electrons Private toEScale1Up Escale1Up Escale1Down Retrieve lookup Muons Photons Electrons Shared EventStore

  5. Design Alternatives SG Folders: • like TDS directories (or Trigger Elements) • Reverse “find”: 1st current dir, then up • Context-specific View Stores: • Shallow copy event store into context store • Record context-specific data objects

  6. VarHandles in Dual-Use Tools? • Declared and set as an AlgToolProperty • In .h • SG::RVar<EventInfo>m_r_evtInfo; • SG::WVar<int> m_w_int; • In .cxx declareProperty("EvtInfoHandle", m_r_evtInfo, “An EventInfo read handle"); Pointer-like syntax m_w_int = new int( m_r_evtInfo->event_number()) • Prototype in athena • a cross between DataLink and ToolHandle • replace record/retrieve • Interface not as rich as StoreGateSvc • Soon to use in athena • how to avoid split with dual-use tools

  7. Status of VarHandles Goal is to have them “tutorial-ready” for Sep (already presented in July LBL tutorial) Focus on interface, some tuning needed • Find better name :-) • How to connect to a non-default store • What is a valid handle? How to do • if (!contains(key)) record(dobj,key) • Optimize implementation later (follow DL) Recommend for athenaat Sep C&S week

  8. Summary • A lot remains to do for analysis data access APIs • Already some “legacy” design choices to deal with • No overarching development thread (that I can see) • Several common themes between Analysis, HLT, Concurrency

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