Redisconf 2019 - part 3: Eventuate and Redis
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An overview of Eventuate and how it works with Redis
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Redisconf 2019 - part 3: Eventuate and Redis
- 1. @crichardson Lecture: About the Eventuate Platform Chris Richardson Founder of Eventuate.io Founder of the original CloudFoundry.com Author of POJOs in Action @crichardson chris@chrisrichardson.net http://microservices.io http://eventuate.io http://plainoldobjects.com Copyright © 2017. Chris Richardson Consulting, Inc. All rights reserved
- 2. @crichardson Agenda Overview of Eventuate Using Eventuate Tram Using Eventuate Tram with Redis
- 3. @crichardson About Eventuate Distributed data management platform for microservices Programming model based on Sagas CQRS http://eventuate.io/
- 4. @crichardson Eventuate architecture Eventuate Library Eventuate Library Relational database Message broker CDC service Publishes messages/events inserted into database
- 5. @crichardson Choice of programming models Eventuate ES Event sourcing framework for microservices Eventuate Tram For services that use traditional persistence, e.g. JDBC/JPA Transaction messaging Sagas
- 6. @crichardson CDC service Tails MySQL/Postgres transaction log looking for inserts to message/events table Using polling for other databases Publishes messages to Message broker Available as Docker containers
- 7. @crichardson Agenda Overview of Eventuate Using Eventuate Tram Using Eventuate Tram with Redis
- 8. @crichardson Transactional messaging and sagas for services using traditional persistence
- 9. @crichardson Eventuate Tram features Transactional messaging Events Commands Saga orchestration
- 10. @crichardson ACID transaction Eventuate Tram Messaging semantics ChannelEventuate Tram Producer Eventuate Tram Consumer Optional partition key Message Scalable Ordered, at-least once delivery DB
- 11. @crichardson Eventuate Tram architecture Eventuate Tram Library Eventuate Tram Library Message broker CDC service Publishes messages inserted into MESSAGE table Relational database: MySQL Postgres MESSAGE Table INSERT INTO MESSAGE…. Subscribe to messages Apache Kafka ActiveMQ RabbitMQ
- 13. Events = Messages++ aggregateType = channel aggregateId is the partition key = ensures ordering of events from a given aggregate
- 14. Commands = Messages++ Asynchronous Request/response Request message has headers: commandType - used to select command handler replyTo - channel to send reply to
- 17. @crichardson Agenda Overview of Eventuate Using Eventuate Tram Using Eventuate Tram with Redis
- 18. @crichardson Eventuate Tram + Redis Eventuate Tram Library Eventuate Tram Library CDC service Publishes messages inserted into MESSAGE table RDBMS MESSAGE Table INSERT INTO MESSAGE…. Subscribe to messages Streams
- 19. @crichardson Eventuate Tram/Redis builds on Redis Consumer Groups A Redis consumer group distributes messages amongs multiple consumers BUT doesn’t preserve ordering Eventuate Tram implements sharding
- 20. @crichardson Implement Eventuate Tram channel with Redis Streams Redis StreamOrder-0 Redis StreamOrder-1 Order eventsEventuate Sharded Producer hashes message key to select Stream ValueKey Eventuate Tram Library XADD…
- 21. @crichardson Consuming Redis Streams Redis StreamOrder-0 Redis StreamOrder-1 ValueKey Eventuate Tram Library XREADGROUP Eventuate Tram Library Redis Message Consumer Shard <=> Consumer Coordination XGROUP CREATE Order-0 orderEventsConsumer …… KVs for Coordination GET SMEMBERS …
- 22. @crichardson Agenda Overview of Eventuate Using Eventuate Tram Using Eventuate Tram with Redis About the Customers and Orders example application
- 23. @crichardson Overview Create orders and customers Choreography (event-based) saga to enforce customer credit limit Redis Streams implement the inter-service messaging Order History Service has Redis-based CQRS view to store customer order history
- 24. @crichardson Application architecture Rest API Redis Tram Adapter Customer Service Rest APIOrder Service Customer Aggregate Order Aggregate Rest API Order History Service Tram Adapter Tram Adapter POST /customers GET /customers/{customerId} MySQL Eventuate CDC POST /orders GET /orders/{orderId}
- 26. @crichardson