springboot-resilience4j

This code is built to showcase how to use resilience4j and micrometer library along with spring-boot. It has implemented CircuitBreaker, RateLimit, Retry and Bulkhead features.

Requirements

JDK 1.8

Getting Started

It has two projects librarymanangement bookmanangement librarymanangement calls bookmanagement service.

Start both the applications -

Book Management Service gradlew build

java -jar build/libs/bookmanangement-0.0.1-SNAPSHOT.jar

url - http://localhost:8083/books

Library Management Service Change the url of Book Management service in LibraryConfig.java file (localhost or PCF url)

gradlew build

java -jar build/libs/librarymanangement-0.0.1-SNAPSHOT.jar

url - http://localhost:8084/library

Test the Get/Post methods with Swagger UI- http://localhost:8084/swagger-ui.html to ensure app methods working.

All the patterns are implemented in librarymanangement code.

Test the patterns

CircuitBreaker Pattern -

  First check the librarymanangement health url - http://localhost:8084/actuator/health 
  to see circuitbreaker metrics exposed through Prometheus
  It should show the state 'Closed' if the application is workin fine.
  
  Now, Stop the bookmanagement application.
  Test the Post method with Swagger UI- http://localhost:8084/swagger-ui.html
  Check the health url of librarymanagement - It should show the circuit state is 'Open'