Umple Mixsets with State Machine
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Mixsets with State Machine
State machine models can contain variant units by employing mixsets. These can be inline (directly specified within a state macine) or compositional (in a separate file). For example, the mixset “HalfOpenFeature” in the code below captures the state “HalfOpen” and with a transition from "Opening" to the “HalfOpen” state. The second code example shows an equivalent state machine model, but with a compositional mixset.
Example showing conditional transitions specified using a mixset
// This example shows how a state machine model can incorporate inline mixsets.
class GarageDoor
{
status {
Open { buttonOrObstacle -> Closing; }
Closing {
buttonOrObstacle -> Opening;
reachBottom -> Closed;
}
Closed { buttonOrObstacle -> Opening; }
Opening {
// HalfOpenFeature mixset below is an inline mixset.
// It contains an event (a part of the state machine).
mixset HalfOpenFeature {
buttonOrObstacle -> HalfOpen;
}
// end of HalfOpenFeature.
reachTop -> Open;
}
// HalfOpenFeature mixset here contains a state (with its content)
mixset HalfOpenFeature {
HalfOpen { buttonOrObstacle -> Opening; }
}
}
}
// A use statement to activate HalfOpenFeature mixset.
use HalfOpenFeature;
Load the above code into UmpleOnline
Example of a mixset incorporated compositionally to modify a state machine
class GarageDoor
{
status {
Open { buttonOrObstacle -> Closing; }
Closing {
buttonOrObstacle -> Opening;
reachBottom -> Closed;
}
Closed { buttonOrObstacle -> Opening; }
Opening {
reachTop -> Open;
}
}
}
// The mixset below contains a compostional mixsets.
mixset HalfOpenFeature {
class GarageDoor
{
status {
Opening {
buttonOrObstacle -> HalfOpen;
}
HalfOpen { buttonOrObstacle -> Opening; }
}
}
}
// A use statement to activate HalfOpenFeature mixset.
use HalfOpenFeature;
Load the above code into UmpleOnline
Syntax
//Issue 148
inlineStateMachine : [=queued]? [=pooled]? [~name] {
( [[comment]]
| [[state]]
| [[trace]]
| [[mixsetDefinition]]
| [=||]
| [[standAloneTransition]]
)* }
stateEntity- : [=||]
| [[mixsetDefinition]]
| [[entryOrExitAction]]
| [[autoTransition]]
| [[transition]]
| [[activity]]
| [[state]]
| [[displayColor]]
| [[trace]]
| ;
mixsetDefinition : mixset [mixsetName]
( [[mixsetInnerContent]]
| [[requirement]]
| [[mixsetInlineDefinition]]
)