title Sárkány fejjel tisztítás (Frissített)

participant SnowPlow
participant DragonHead
participant RoadSection 1

[->SnowPlow:
activate SnowPlow

SnowPlow->DragonHead: doCleaning(Map, RoadSection 1, SnowPlow)
activate DragonHead

DragonHead->RoadSection 1: getState()
activate RoadSection 1
RoadSection 1-->DragonHead: state
deactivate RoadSection 1

opt state != GRAVELLED_FRESH && state != GRAVELLED_AGED
    DragonHead->SnowPlow: consumeFuel()
    activate SnowPlow
    SnowPlow-->DragonHead: 
    deactivate SnowPlow

    DragonHead->RoadSection 1: clear()
    activate RoadSection 1
    RoadSection 1-->DragonHead: 
    deactivate RoadSection 1
end

DragonHead-->SnowPlow: 
deactivate DragonHead

[<--SnowPlow:
deactivate SnowPlow