POC of reactive service based on spring reactor & web-flux

Introduction

This is simple proof of concept of non-blocking rest service which is based on web-flux module (backed by netty) from spring.

Notes:

• there's no tomcat (jetty, wildfly, weblogic or any other servlet or application container) dependency on the classpath.*
• default number of threads for requests handling is determined by spring boot that is using Reactor Netty, which is using Netty's defaults.
• gson is used to encode incoming json to service's dto objects and decode dto objects to outgoing json messages. Current implementation simply relies on plain toJson and fromJson methods without any extra configuration (which might be needed.)

Run the application

Service's requirements:

• java 8+;
• gradle 4.x+

In order to run the service execute in shell : ./gradlew bootRun. You should be able to see the service's log messages.

Hit http://localhost:7777/rest-service/hello endpoint to verify whether service has started correctly - you should be able to see the "hello reply message".

Currently the service's default port on which it is going to accepts incoming requests is 7777. You can change it in application.properties which is located under resources folder (look for server.port property).

Service's REST API

See the list of avalilable endpoint below.

Math operation	Method	Content Type	URL	Request Body Example	Response Body Example
x+y	POST	application/json	http://localhost:7777/rest-service/add	{ "x": "[x_value]", "y": "[y_value]" }	{ "result": "[result]", "message": "[additional details]" }
x-y	POST	application/json	http://localhost:7777/rest-service/sub	{ "x": "[x_value]", "y": "[y_value]" }	{ "result": "[result]", "message": "[additional details]" }
x/y	POST	application/json	http://localhost:7777/rest-service/divide	{ "x": "[x_value]", "y": "[y_value]" }	{ "result": "[result]", "message": "[additional details]" }
x*y	POST	application/json	http://localhost:7777/rest-service/multiply	{ "x": "[x_value]", "y": "[y_value]" }	{ "result": "[result]", "message": "[additional details]" }
x^2 - sqrt(y)	POST	application/json	http://localhost:7777/rest-service/inPowerOf2SubSqrt	{ "x": "[x_value]", "y": "[y_value]" }	{ "result": "[result]", "message": "[additional details]" }