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>> #2c4a6b {
  protocol_version : string
  backpressure_signal : boolean
}
class "Producer" as producer <<actor>> {
  language_binding : string
  backpressure_observability : boolean
}
class "Consumer" as consumer <<actor>> {
  processing_rate : number
  flow_control_capability : boolean
}
class "Event Data" as event_data <<block>> {
  payload : string
  timestamp : number
}
class "Topic Metadata" as topic_metadata <<block>> {
  partition_count : number
  retention_period : string
}

class "Wire-compatible with Kafka producer protocol for migration safety" as kafka_wire_compatibility <<constraint>> {
}
class "Single binary, single config file, runs on a single node up to 100k events/sec" as single_binary_deployment <<constraint>> {
}
class "Apache 2.0 license" as apache_2_0_license <<constraint>> {
}

producer <|-- eventstream
consumer <|-- eventstream
producer --> event_data
consumer --> event_data
eventstream *-- topic_metadata
kafka_wire_compatibility ..> eventstream : applies_to
single_binary_deployment ..> eventstream : applies_to
apache_2_0_license ..> eventstream : applies_to

legend right
  **Requirements**
  **REQ-001** — Producers must receive backpressure signals in-band as a first-class part of the protocol.
  **REQ-002** — The system must default to consumer-driven flow control.
endlegend
@enduml

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