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7.5. Static Semantics for Models
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15 )
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Listing 7.15: gEmbeddedStateMachine constraint 1
This constraint implicitly defines that all oEmbeddedState objects have a decomposition.
A state machine always needs to have exact one initial state to be able to start.
1 context CProject
2 inv : m_GraphSet−>s e l e c t (m_Type = ’ gEmbeddedStateMachine ’ )−>f o r A l l (
3 graph |
4 graph . m_ObjectSet . s e l e c t (m_Type = ’ oEmbeddedInitialState ’ )−>s i z e ( ) = 1
5 )
Listing 7.16: gEmbeddedStateMachine constraint 2
Additionally, each oEmbeddedInitialState object must be exact in one current state role or
rather an InitialTransition relationship.
1 context CProject
2 inv : m_GraphSet−>s e l e c t (m_Type = ’ gEmbeddedStateMachine ’ )−>f o r A l l (
3 graph |
4 graph . m_BindingSet−>s e l e c t ( m_pRelationship . m_Type = ’ I n i t i a l T r a n s i t i o n ’ )−>s i z e ( ) = 1
5 )
Listing 7.17: gEmbeddedStateMachine constraint 3
It is necessary that all oEmbeddedState objects are in at least one CurrentState role to avoid
dead locks / states.
1 context CProject
2 inv : m_GraphSet−>s e l e c t (m_Type = ’ gEmbeddedStateMachine ’ )−>f o r A l l (
3 graph |
4 graph . m_ObjectSet−>s e l e c t (m_Type = ’ oEmbeddedState ’ )−>f o r A l l (
5 o b j e c t |
6 graph . m_BindingSet−>s e l e c t ( m_pRelationship . m_Type =
’ T r a n s i t i o n ’ ) . m_Connection . m_Calls−>s e l e c t (m_pRole . m_Type = ’ CurrentState ’ and
m_pObject = o b j e c t )−>s i z e ( ) >= 1
7 )
8 )
Listing 7.18: gEmbeddedStateMachine constraint 4
Similar to the constraint for non-concurrent priorities for transition of ETCS Modes in
Subsection 7.5.1, also those situations must be avoided for the priority of transitions of
embedded state machines.
1 context CProject
2 inv : m_GraphSet−>s e l e c t (m_Type = ’ gEmbeddedStateMachine ’ )−>f o r A l l (
3 graph |
4 graph . m_ObjectSet−>s e l e c t (m_Type = ’ oEmbeddedState ’ )−>f o r A l l (
5 s t a t e |
6 graph . m_BindingSet−>s e l e c t ( m_Connection . m_Calls−>e x i s t s ( m_pObject =
s t a t e ) ) . m_pRelationship−>s e l e c t (m_Type =
’ T r a n s i t i o n ’ ) . m_Properties−>s e l e c t (m_Type = ’ P r i o r i t y ’ )−>isUnique (m_Value)
7 )
8 )
Listing 7.19: gEmbeddedStateMachine constraint 5
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