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11.2. Platform Specific Model for the Simulation
current train speed and the absolute distance. Their simulative calculation will be explained in
Subsection 11.2.3, which illustrates details about the implementation.
According to Req.15, the access to the DMI is realised by the definition of another D-Bus
interface that is used in the concrete DMI observer CDMIQWidget from Subsection 8.3.2.
Since the resulting generated D-Bus adaptor is simply used as composition, an additional
UML diagram is omitted. Details about the interface and the adaptor can be found alongside
with all other openETCS domain framework description in Appendix D. The access to the
DMI from the simulation is in conflict with the general design principle that only accesses
by method calls from the PIM to the PSM are allowed. Therefore, the DMI adaptor should
only be available for simulation purposes and only be used if required. This is done by the
openETCS C++ generator by setting a Boolean property of the gEVCStateMachine root graph.
The full documentation of the graph properties can be found in Section B.1.
11.2.2. Deployment Design
The deployment of the PSM for the simulation is shown in Figure 11.5, which is an extension
of the PSM execution environment in Figure 8.19. The new artefacts are described below:
Simulation
Holds all the PSM implementations needed for providing simulative
hardware devices.
WrapperFunctions
SimulationModel
DMIDBusInterface
DMIDBusAdaptor
SimulationModel.xmi
Provide a C-API for accessing objects of classes of the Simulation artefact
because the RT-Tester module used for code generation currently
only supports the generation of C source code [72].
Holds the simulation source code generated from the simulation
model.
Provides the generated sources for the D-Bus proxy of the additional
adaptor for the DMI / CDMIQWidget class.
Includes the generated sources for the D-Bus adaptor for the DMI
respectively the class CDMIQWidget.
Exported UML simulation model as XMI file.
DMI.xml
Is the D-Bus interface specification for the required DMI adaptor
(Req.15).
Details about the simulation model itself and the corresponding code generation can be found
in Section 11.3 and Section 11.4.
The libopenETCSPSMSIM component combines the static source code for the simulation
environment as library and is imported by the Simulation executable binary.
The manifestation of the libopenETCSPIM component is not complete in Figure 11.5 and only
represents the extensions compared to Figure 8.19. Since the usage of the DMI D-Bus adaptor
is not defined before the generation of the GeneratedInstantiations artefact (Figure 8.19), the
DMIDBusAdaptor source artefact must always be a part of the libopenETCSPIM library
component.
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