UMLモデリングのエッセンス 第3版 図4.4

SequenceDiagram3.plantuml

@startuml
hide footbox

participant ":Order" as O
participant "careful : Distributor" as CD
participant "regular : Distributor" as RD
participant ":Messenger" as M

/' skinparam lifelineStrategy solid '/
skinparam lifelineStrategy dashed

[o-> O : dispatch
activate O

loop for each line item
    alt value > $10000
        O ->> CD : dispatch
        activate CD
        deactivate CD
    else else
        O -\\ RD : dispatch
        activate RD
        deactivate RD
    end
end
opt needsConfirmation
    O -\\ M : confirm
    activate M
    deactivate M
end

@enduml