RootStorageSvc::RNTupleWriterHelper Node1 RootStorageSvc::RNTupleWriter Helper - m_attrDataMap - m_model - m_entry - m_ntupleWriter - m_ntupleName - m_tfile - m_opts - m_rowN - m_clients - m_needsCommit - m_collectMetrics + RNTupleWriterHelper() + ~RNTupleWriterHelper() + makeNewEntry() + addAttribute() + addField() + addFieldValue() + commit() + getName() + size() + needsCommit() + isGrouped() + increaseClientCount() + close() Node2 AthMessaging - m_nm - m_msg_tls - m_imsg - m_lvl - ATLAS_THREAD_SAFE + AthMessaging() + AthMessaging() + ~AthMessaging() + msgLvl() + msg() + msg() + setLevel() - AthMessaging() - AthMessaging() - operator=() - initMessaging() Node2->Node1