activitydiagram activ activ diagram activ diagram workflow behavior activ diagram similar state diagram activ state do diagram state activ show sequenc activ perform log log purpos debug log trace messag provid mechan allow develop enabl output minor event focus specif problem area follow go insid argo uml tag valu multipl valu support current support tag valu singl valu uml tag valu multipl valu us mdr autocommit mode perform drain net bean mdr implement support transact standard commit rollback semant write read transact caller isn us transact mdr wrap oper separ transact signific overhead particularli larg number mdr oper perform singl logic argo uml function 