Spring Boot: How to design an efficient REST API?

Resource collections are often enormous, and when some data has to be retrieved from them, it would be only not very efficient to always get the full list and browse it for specific items. Therefore we should design an optimized Search API.

A few of the essential features for consuming an API are:

• Filtering: to narrow down the query results by specific parameters, eg. creation date, or country

GET /api/cars?country=USA
GET /api/cars?createDate=2019–11–11

• Sorting: basically allows sorting the results ascending or descending by a chosen parameter or parameters, eg. by date

GET /api/cars?sort=createDate,asc
GET /api/cars?sort=createDate,desc

• Paging:
  uses “size” to narrow down the number of results shown to a specific number and “offset” to specify which part of the results range to be shown — this is important in cases where the number of total results is greater than the one presented, this works like pagination you may encounter on many websites Usually, these features are used by adding a so-called query parameter to the endpoint that is being called.

GET /api/cars?limit=100
GET /api/cars?offset=2

All together:

GET /api/cars?country=USA&sort=createDate,desc&limit=100&offset=2

This query should result in the list of 100 cars from the USA, sorted descending by the creation date, and the presented records are on the second page, which means they are from a 101–200 record number range.

How to run the project

Clone source code from git

$  git clone https://github.com/Raouf25/Spring-Boot-efficient-search-API.git 

Build Docker image

$  docker build -t="spring-boot-efficient-search-api" --force-rm=true .

This will first run maven build to create jar package and then build hello-world image using built jar package.

Note: if you run this command for the first time, it will take some time to download the base image from DockerHub

Run Docker Container

$ docker run -p 8080:8080 -it --rm spring-boot-efficient-search-api

Test application

$  curl localhost:8080/api/cars/1

the response should be:

{
   "id":1,
   "manufacturer":"Acura",
   "model":"Integra",
   "type":"Small",
   "country":"Japon",
   "createDate":"1931-02-01"
}

Stop Docker Container:

docker stop `docker container ls | grep "spring-boot-efficient-search-api:*" | awk '{ print $1 }'`

Live Demo

This project is deployed in https://efficient-search-api.herokuapp.com/api/cars

Let's try: https://efficient-search-api.herokuapp.com/api/cars?country=USA&sort=createDate,desc&limit=100&offset=2

License

For more details please see this medium post .

Spring Boot Efficient Search Api Copyright © 2020 by Abderraouf Makhlouf [email protected]