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s1p-2019

Projects for Spring One Platform 2019

Event-Driven Architectures for Spring Developers

Overview

This repo contains 3 Spring Boot projects

  • update-currency - A REST application for updating currency conversion rates: It uses Spring JPA and will auto-create the schema for the currency table; the application.properties are configured to use a database named cdc.

  • from-maxwell - Receives change events from MySQL via Zendesk Maxwell and a Kafka topic maxwell and forwards currency changes to compacted topic currency. Deletions are forwarded as tombstone records.

  • read-currency - Receives currency events and stores them in a map for instant use within the application. Java and Kotlin versions are provided.

Setup

Install MySQL and Maxwell (I used homebrew on Mac OS).

I had some [authentication issues with MySQL 8, documented here](zendesk/maxwell#1232).

my.cnf
server_id=1
log-bin=master
binlog_format=row
default-authentication-plugin=mysql_native_password
CREATE USER 'maxwell'@'localhost' IDENTIFIED WITH 'mysql_native_password' AS 'maxwell';

Running

Run maxwell

$ maxwell --user maxwell --password maxwell --producer=kafka --kafka.bootstrap.servers=localhost:9092 --kafka_topic=maxwell

Run all three boot applications and post a few currency updates:

$ curl -X POST http://localhost:8080/update/USD/1000

$ curl -X POST http://localhost:8080/update/GBP/782

$ curl -X POST http://localhost:8080/update/EUR/800

$ curl -X POST http://localhost:8080/delete/EUR

Observe the console of the read-currency application.