Result Types

Organizes Flux/Mono terminals and result types of PageResult, PageStream, ResultTuple in Reactive Mongo DSL.

Basic return type of Terminal

findAll / Search findAll / Vector findAll

Flux<E>

find / Search find / Vector find

Mono<E>

count

Mono<Long>

exists / existsQuery

Mono<Boolean>

distinct

Flux<R>; 필요할 때 호출 측에서 collectList()

PageResult<T>

getData()

현재 page의 List<T>

getTotalCount()

total matching count

map / mapNotNull / filter / filterNotNull

transform current page data while maintaining totalCount

size / isEmpty

helper based on current page data

totalPages / hasNext

page calculation helper using totalCount and page size

PageStream<T>

data()

현재 page data Flux<T>

totalCount()

전체 count Mono<Long>

map / mapNotNull / filter / filterNotNull / onEach

Maintain totalCount with reactive data transformation

size() / isEmpty() / totalPages() / hasNext()

Mono-based reactive page helper

collectToPageResult()

data Flux를 List로 모아 Mono<PageResult<T>>로 변환

If streaming is the goal, keep PageStream

PageResult holds data as a List. If intermediate collection is not needed in batch/stream processing, it's more natural to handle the Flux of PageStream directly.

ResultTuple<L, R>

getLeftName() / getLeft()

Left query builder name and result

getRightName() / getRight()

Right query builder name and lookup/group result

getTotalCount()

Optionally linked totalCount for the tuple

getRightIfListFirst()

If right is a List, returns the first element; returns null if null or empty List.

Null in ResultTuple helper is different from Reactor signal.

getRightIfListFirst() is a regular Java helper, so it can return null. Do not directly put the return value into Mono.just(...); use Mono.justOrEmpty(...), Optional, or explicit branching.