SynthEvents

Real systems have a history. Examples rarely do.

A handful of events written by hand shows how to write an event, but not what working with a store is like once it has grown over months, with many streams that interleave. SynthEvents gives you that history at once.

• Behavior, not noise. People follow the rhythm of their day and the rules of their domain – a reader who finds every copy of a book out comes back later, and a late return costs a fee.
• The same data for everyone. A data set follows from its seed and the version of SynthEvents, so everyone in a workshop works on the same events, and its events say how to make it again.
• Ready for EventSourcingDB. Every data set comes as plain CloudEvents and as a backup that restores as it is.

{
  "type": "io.synthevents.library.book-borrowed",
  "subject": "/books/6fdeca74-aa2f-4fd0-ad0f-1f62f2c99b32",
  "time": "2025-01-06T15:06:08.55670659Z",
  "data": {
    "borrowedAt": "2025-01-06T15:06:08.556Z",
    "borrowedBy": "/readers/eb6b7f2c-1e87-4c66-bd86-0a0bfd1b57d1",
    "borrowedUntil": "2025-01-27"
  }
}

An event of the small standard data set of the library, shortened to its type, subject, time, and data.