ActsExCellWriterSvc Node1 ActsExCellWriterSvc - m_rootEccWriter - m_queue - m_chargedMutex - m_writeThread - m_doEnd - m_filePath - m_treeName - m_writeBoundary - m_writeMaterial - m_writeSensitive - m_writePassive + initialize() + finalize() + ActsExCellWriterSvc() + store() - doWrite() Node2 extends< AthService, IActsExCellWriterSvc > Node2->Node1