/event-materializer-sample

Primary LanguageJava

Event Materializer Sample

Description

Event materializer listens in a datasource (eg: MySQL, Kafka, etc.) where events are emitted and materializes them to a in memory data structure (eg: map, list, etc.)

Eg:

Datasource: [UserCreatedEvent, UserActivatedEvent, UserJoinedPointsMembershipEvent, ...]  
Offset:             0               1                       2                         n

                        |
                        |
                        |
                    [EVENT MATERIALIZER]
                        |
                        |
                        
                 usersBuffer:[ userId:{user}, ... ]

Offset should only moves forward as time goes by (events added, etc)

More info about event sourcing: Nice presentation of event sourcing

Abstractions:

[DATA-BUFFER] <--(2)-- [DATA-BUILDER] <--(1)-- [DATA-SOURCE]
  • (1) observes state-changes/events for specified datasource
  • (2) updates contents of buffer with the ones received from datasource

How to run

  • Execute: docker-compose up

  • Execute: mvn spring-boot:run

  • Visit: http://localhost:1711/posts.xhtml

  • Execute (optional): docker-compose down