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@startuml
scale 1.2

participant "Kafka Cluster" as kafka
participant "Business Application" as app


activate app

app -> kafka+: 1.0 poll()
app <- - kafka-: 1.1 messages

app -> app: 2.0 process(messages)

app -> kafka+: 3.0 commit()
app <- - kafka-: 3.1 ack

deactivate app
@enduml

PlantUML version 1.2020.19beta4(Unknown compile time)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>