user { # User
  n1: circle label:"Start A B Testing"
  n4: rectangle label:"Execute A B Testing action"
  n7: rectangle label:"Monitor A B Testing status"
  n10: circle label:"End A B Testing"
  n1.handle(bottom) -> app.n2.handle(top)
  n4.handle(bottom) -> app.n5.handle(top)
  n7.handle(bottom) -> app.n8.handle(top)
}

app { # App
  n2: rectangle label:"Receive A B Testing event"
  n5: rectangle label:"Record A B Testing outcome"
  n8: rectangle label:"Monitor A B Testing status"
  n2.handle(bottom) -> service.n3.handle(top) [label="Next"]
  n5.handle(bottom) -> service.n6.handle(top) [label="Done"]
  n8.handle(bottom) -> service.n9.handle(top) [label="Processed"]
}

service { # Service
  n3: rectangle label:"Validate A B Testing conditions"
  n6: rectangle label:"Monitor A B Testing status"
  n9: diamond label:"Monitor A B Testing status"
  n3.handle(right) -> user.n4.handle(left)
  n6.handle(right) -> user.n7.handle(left)
  n9.handle(right) -> user.n10.handle(left)
  n9.handle(left) -> app.n8.handle(left) [label="Retry/Rejected"]
}