bullet-tooth/spring-webflux-pagination-example

Spring Webflux pagination example

By default spring-webflux does't support pagination because Flux designed to be unbounded. This project shows custom implementation of pagination for reactive stack.

• com.example.springwebfluxpaginationexample.EntityController describes request mapping for pageable requests
• com.example.springwebfluxpaginationexample.EntityService describes Flux to Page mapping.

Request & Response examples:

Request: GET http://localhost:8080/entities

Response:

{
  "content": [
    {
      "name": "Ukraine"
    },
    {
      "name": "Spain"
    },
    {
      "name": "Canada"
    },
    {
      "name": "China"
    },
    {
      "name": "Croatia"
    },
    {
      "name": "Italy"
    },
    {
      "name": "Egypt"
    }
  ],
  "pageNumber": 0,
  "pageSize": 20,
  "totalElements": 7,
  "first": true,
  "last": true,
  "totalPages": 1
}

Request: GET http://localhost:8080/entities?page=0&size=2

Response:

{
  "content": [
    {
      "name": "Ukraine"
    },
    {
      "name": "Spain"
    }
  ],
  "pageNumber": 0,
  "pageSize": 2,
  "totalElements": 7,
  "first": true,
  "last": false,
  "totalPages": 4
}

Technology stack

• Maven
• Spring boot 2.0
• Spring webflux
• Lombok

Pay attention:

This solution is not optimized at performance perspective. Each time we fetch all entities form repository (database) and then map them to the requested page.