Microservice skeleton

This demonstrates how to create a microservice with api, http-client and schema as separate jars.

• microservice-api
• microservice-http
• microservice-schema

Read Building Microservice, Chapter 5/ "Sharing code via libraries".

Also read

• https://github.com/Netflix/Hystrix/wiki/#what

publishing artifacts

λ gradle test

BUILD SUCCESSFUL in 0s
5 actionable tasks: 5 up-to-date

λ gradle publishToMavenLocal
λ ls -l ~/.m2/repository/org/duwamish/microservice/
total 0
drwxr-xr-x  4 prayagupd  184630988  128 Jul 21 16:11 microservice-api
drwxr-xr-x  4 prayagupd  184630988  128 Jul 21 16:13 microservice-schema

creating fat artifact

λ gradle fatJar
λ ls -l microservice-api/build/libs/
total 8
-rw-r--r--  1 prayagupd  184630988  1644 Jul 21 16:00 microservice-api-1.0.jar

λ ls -l microservice-schema/build/libs/
total 8
-rw-r--r--  1 prayagupd  184630988  1233 Jul 21 16:00 microservice-schema-1.0.jar

run microservice

λ gradle clean run

curl localhost:8080/v1/ads
[{"ads":["1","2"]}]


## logs
-------------------------------------- start selection request1 ------------------------
-------------------------------------- start selection request2 ------------------------
rank request1 started: pool-2-thread-1: 5005
rank request2 started: pool-2-thread-1: 5007

rank request1 completed: pool-2-thread-1: 8015
rank request2 completed: pool-2-thread-1: 8018

Response created in pool-2-thread-1: 8018
Response completed in pool-2-thread-1: 8018

Implementing Microservice Communication

1. Looking for ideal technology: SOAP, REST, gRPC
2. Make backward compatibility easy
3. Make your interface explicit

Upstream/ consumer microservices practices

• https://martinfowler.com/bliki/TolerantReader.html

be conservative in what you do, be liberal in what you accept from others.
Jon Postel

Downstrea microservices

• https://github.com/lamatola-os/spring-netty-adranking-microservice