PlantUML Web Server

@startuml
skinparam backgroundColor #f5efe2
skinparam shadowing false
skinparam class {
  BackgroundColor #fdfaf0
  BorderColor #b8a982
  ArrowColor #6e5d3d
  FontName "Helvetica"
}
skinparam note {
  BackgroundColor #f0e3c4
  BorderColor #b8a982
}
hide empty members

class "EventStream" as eventstream_system <<system>> #2c4a6b {
  protocol_compatibility : boolean
  license : string
}
class "Platform Engineer" as platform_engineer <<actor>> {
  experience_level : enum{junior,mid-level,senior}
}
class "Event Data" as event_data <<block>> {
  payload : string
  timestamp : number
}
class "Backpressure Signal" as backpressure_signal <<block>> {
  severity : enum{low,medium,high}
}

class "Wire-compatible with Kafka producer protocol for migration safety" as wire_compatibility <<constraint>> {
}
class "Single binary, single config file, runs on a single node up to 100k events/sec" as single_binary_limit <<constraint>> {
}
class "Apache 2.0 license" as apache_license <<constraint>> {
}

platform_engineer --> eventstream_system : operates_on
eventstream_system *-- event_data : streams
eventstream_system --> backpressure_signal : emits
wire_compatibility ..> eventstream_system : applies_to
single_binary_limit ..> eventstream_system : applies_to
apache_license ..> eventstream_system : applies_to

legend right
  **Requirements**
  **REQ-001** — Producers must receive backpressure signals as a first-class part of the protocol.
  **REQ-002** — Consumer-driven flow control must be the default operational mode.
endlegend
@enduml

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