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 <<block>> {
  message_payload : string
  backpressure_signal_input : boolean
}
class "Consumer" as consumer <<block>> {
  processing_rate : number
  lag_status : string
}
class "Event Message" as event_message <<block>> {
  topic : string
  key : string
  value : string
}
class "Platform Engineer" as platform_engineer <<actor>>

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>> {
}

platform_engineer ..> eventstream
producer <|-- eventstream
consumer <|-- eventstream
producer *-- event_message
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 as a first-class part of the protocol.
  **REQ-002** — The system must default to consumer-driven flow control.
  **REQ-003** — The system must handle modern LLM-pipelined workloads.
endlegend
@enduml

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