s1p-2019

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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.

.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.