@ CheckReturnValue @ BackpressureSupport ( BackpressureKind . FULL ) @ SchedulerSupport ( SchedulerSupport . NONE ) public final < R > Flowable < R > concatMapDelayError ( Function < ? super T , ? extends Publisher < ? extends R > > mapper ) { return concatMapDelayError ( mapper , 2 , true ) ; }
Maps each of the items into a Publisher subscribes to them one after the other one at a time and emits their values in order while delaying any error from either this or any of the inner Publishers till all of them terminate .