question: public String addStepToCreateSnapshotSession ( Workflow workflow , URI systemURI , URI session , String repGroupName , String waitFor ) { String stepId = workflow . createStep ( BlockDeviceController . CREATE_SNAPSHOT_SESSION_STEP_GROUP , String . format ( "Creating block snapshot session" ) , waitFor , systemURI , getDeviceType ( systemURI ) , getClass ( ) , createBlockSnapshotSessionMethod ( systemURI , session , repGroupName ) , rollbackMethodNullMethod ( ) , null ) ; return stepId ; }
target:  Adds the step to create block snapshot session.