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Chapter 8. openETCS Domain Framework The classes in ::oETCS::DF::UT are the test suites, which inherit from TextFixture [16], which is a class of the CppUnit framework. The classes that are tested are indicated by the aggregations m_pAnd, m_pTelegram, m_pStateMachine, and m_pControlFlow. Of course, all classes are tested, but, due to the size and complexity of the figure, only some examples are sketched. The test suite classes must have access to all attributes, which include the private and protected ones, of the tested classes to provide white-box testing [78, p. 312] instead of pure black-box testing [78, p. 312], which only runs tests on the outputs for certain inputs. Since most of those methods are not public visible / accessible, a friend [79] relation between test suite classes and the classes to be tested have to be defined (omitted in the figure). Black-box testing might be sufficient for tests for the CFunctionBlock classes because those are defined as transfer functions for certain inputs, which return certain outputs. Consequently, their internal states are not of interest for the tests. However, this is not the case for all other classes and white-box tests are implemented via direct class attribute access. 8.7.2. Unit Testing Implementation The implementation of tests for CFunctionBlock blocks is realised as random testing [78, p. 317]. For all inputs of a certain CFunctionBlock class, random input values are generated. Since the the transfer function for the Execute() method is always well-defined for each CFunctionBlock class, the resulting outputs can be checked for the expected values. For classes outside the data flow, such interconnections between inputs and outputs is not defined. Therefore, those have to be tested in a simulative way [78, p. 318]. Especially, the classes for control flows (CControlFlow and CEVCStateMachine) can be additionally tested by state transition testing [78, p. 318]. For those cases, a transition system is instantiated by corresponding state and transition objects and then is tested if all states are reached and executed as expected. A further, more detailed discussion of test implementation is not in the main focus of this work. The software reference of the tests and their implementation can be found in Appendix G. 8.8. Conclusion The design, the implementation, and finally the testing of the openETCS domain framework show that all initial defined requirements are fulfilled. Certain, already theoretical introduced issues, like the integration of hardware virtualisation, are dealt with. Furthermore, the domain framework is aligned to the terminology of the OMG’s definition of a model-driven architecture (MDA). The special situations of the behavioural design is described because this is defined by the instantiation of domain framework classes. This can also be called “behaviour through structure”. In contrast to all other instances of the openETCS architecture, the domain framework has to differentiate between faults, errors, and system failures and has to provide an error handling interface to the meta model respectively model. 158
9openETCS Generator Application This chapter describes the design and implementation of the openETCS code generator. Initially, general requirements for the application are defined. In general, the development description follows the same principles as in Chapter 8, which discussed the openETCS domain framework. Hence, the generator design is illustrated by the used design strategy, the structural design, and the deployment while UML is used as formalism. Also, the implementation is discussed by concrete source code examples. Additionally, the generation of configurations for virtual machines is introduced, which is followed by the description of the V&V strategy of the complete openETCS development process. Finally, the complete employed tool chain down to executable EVC binary is presented. 9.1. Requirements In a DSL, the generators typically build the link between a model and the domain framework, which was introduced in Chapter 3. Therefore, the process of generating the code that is compiled and linked against the domain framework is also called model-to-text or model-to-code transformation. Since the code generators are not executed together with the target, but their execution result strongly influences the target execution, the requirements for the openETCS generator development are quite different from the ones for the domain framework in Section 8.1 and are defined as follows: Req.9: full coverage / usage of relevant model elements Req.10: generation of optimised code Req.11: generation of a build configuration for compiling and linking the resulting executable binary Req.12: generation of virtual machine configurations for the PIM and PSM Req.9 To guarantee that the generated code from the openETCS model is a correct transformation, it must be ensured that all relevant elements in the model are used during the generation process. All relevant elements means any GOPPRR type that influences the dynamic semantics. Those are the most types besides the ones only used for documentation, like oNote. 159
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Open Source Software for Train Cont
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Datum des Promotionskolloquiums: 21
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Acknowledgments I would like to tha
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Abstract This document describes th
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Contents 3.3.3. Rascal . . . . . .
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Contents 8.4. Behavioural Design .
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Chapter 1. Introduction Railway Con
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Chapter 1. Introduction MontiCore M
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Chapter 1. Introduction ERTMS Forma
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4.5. The Object Constraint Language
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4.5. The Object Constraint Language
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4.6. Tool Chain where artefacts are
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Part II. Dependability 55
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6Security in Open Source Software A
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6.2. Hardware Virtualisation Again,
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Chapter 12. Conclusion and Outlook
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Part IV. Appendix 241
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Appendix A. GOPPRR to MOF Transform
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DopenETCS Domain Framework D.1. Dom
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Appendix E. openETCS Generator 39 <
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FMetaEdit+ Generators F.1. GOPPRR X
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GopenETCS Unit Testing G.1. Unit Te
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Appendix H. openETCS Simulation 14
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Glossary ANTLR ANother Tool for Lan
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Glossary EVC An European Vital Comp
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Glossary OEM An original equipment
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Glossary XML The Extensible Markup
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Bibliography [12] “EN 50128 - Rai
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Bibliography [39] ——, ““Ope
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Bibliography [69] T. J. Parr and R.
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Index Artefact, 51 Automatic train
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Index Linux, 149 Memory management,
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