spring-reactive-api

TODO: improve readme

Build

mvn clean install in root dir

Run

mvn spring-boot:run

• in example-server starts server on port 8081
• in example-client starts client on port 8082

Use

Server endpoint: GET http://localhost:8081/things?nbThings=5

Client endpoint to trigger call to server: GET http://localhost:8082/trigger

Flow

Simple chain:

• Trigger Client endpoint
• Client requests a number of Things
• Server processes request:
  • Raw data for the Thing is generated (eg String "thing #0")
  • String gets transformed to uppercase (eg "THING #0") --> takes 1s per object
  • Thing gets constructed from String (String becomes field content + id is generated) --> takes 1.5s per object
  • Things are returned to Client
• Client transforms received objects (extract content as String) --> takes 1.5s per object
• Client endpoint returns list of Strings

If all done synchronously, it would take 1*n + 1.5*n + 1.5*n = 4*n seconds to receive a response for n objects. But because of smart Flux chaining it only takes about 1 + 1.5 + 1.5*n = 1.5*n + 2.5 seconds. That's 10 seconds for 5 objects (compared to 20 for sync variant), with the gap growing for larger requests.

Contribute

Next steps

• Add DB and reactive repository with R2DBC
• Add security
• ???
• Profit