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// UML state machine diagram for a canal lock, // represented in UML class Lock { Boolean boatGoingDown = false; Boolean boatGoingUp = false; Boolean boatBlockingGate = false; lockState { BothDoorsClosedLockFull { // Waiting for boat boatRequestsToEnterAndGoDown -> OpeningUpperGate; boatRequestsToEnterAndGoUp -> LoweringWater; } OpeningUpperGate { upperGateFullyOpen -> UpperGateOpen; } UpperGateOpen { entry / {setBoatGoingUp(false);} boatInLockRequestingToGoDown -> / {setBoatGoingDown(true);} ClosingUpperGate; after(180000) [!boatBlockingGate] -> ClosingUpperGate; } ClosingUpperGate { upperGateFullyClosed [boatGoingDown] -> LoweringWater; upperGateFullyClosed [!boatGoingDown] -> BothDoorsClosedLockFull; } LoweringWater { waterLevelMatchesDownStream -> OpeningLowerGate; } BothDoorsClosedLockEmpty { // Waiting for boat boatRequestsToEnterAndGoUp -> OpeningLowerGate; boatRequestsToEnterAndGoDown -> RaisingWater; } OpeningLowerGate { lowerGateFullyOpen -> LowerGateOpen; } LowerGateOpen { entry / {setBoatGoingDown(false);} boatInLockRequestingToGoUp -> / {setBoatGoingUp(true);} ClosingLowerGate; after(180000) [!boatBlockingGate] -> ClosingLowerGate; } ClosingLowerGate { lowerGateFullyClosed [boatGoingUp] -> RaisingWater; lowerGateFullyClosed [!boatGoingUp] -> BothDoorsClosedLockEmpty; } RaisingWater { waterLevelMatchesUpStream -> OpeningUpperGate; } } }
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