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state-events

Example for event resourcing, and server sent event based frontend state management.

Description

The actual resource is the aggregate of the events. You can create a resource with PUT modify it with POST and mark as deleted with DELETE methods. Every events can be undone except creation, or the last change was from another session. Undo events can redoed in (with) the same session(-id). It possible to remove fields on by one (except resource id, and resource type), to clean up a resource.

Start dockerized PostgreSQL

docker-compose up -d

Log into psql console

psql -U postgres -p 5433 -h localhost

Build frontend and run the backend

lein release

lein run

Open re-frame app

  • open the app
  • Add new person, select it from the list above, try to apply different changes on it
  • Open another session in private browser, or another browser, to see if SSE works
  • check for cookies in the developer tools, it shoud have a session-id key with UUID value