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Cyclic Cycles
The CDP4-COMET data model, derived from ECSS-E-TM-10-25A-Annex-A, is an object graph in which potential cyclic references can be created when the datatypes are instantiated. The creation of such cyclic data shall not be permiited by software implementations. The CDP4-COMET Webservices makes sure that cyclic data is avoided, the validations are implemented in the SideEffects. In case a cycle would be introduced in the dataset a AcyclicValidationException is thrown.
The following tables provide an overview of the datatypes where cylces may occur and a link to the CDP4-COMET Web Services source code where the potential for cyclic references are checked and prohibited.
| Type | Possible Cycle Description | Source code link |
|---|---|---|
| BooleanExpression | via term | BooleanExpressionSideEffect |
| ElementDefinition | via containedElement.elementDefinition and referencedElement.elementUsage.elementDefinition and referencedElement.rootElement | ElementDefinitionSideEffect |
| ElementUsage | via elementDefinition.containedElement | ElementDefinitionSideEffect |
| NestedElement | via elementUsage.elementDefinition and via referencedElement.rootElement | persistence of NestedElements is an untested and unused feature of the CDP4 Webservices |
| ParameterGroup | via containingGroup | ParameterGroupSideEffect |
| RequirementsGroup | via group | RequirementsGroupSideEffect |
The following classes can cause cycles that are not prohibited as they do not cause any unwanted side-effects.
| Type | Possible Cycle Description |
|---|---|
| BinaryRelationship | via term |
| MultiRelationship | via term |
| Type | Possible Cycle Description | Source code link |
|---|---|---|
| CompoundParameterType | via component.parameterType | CompoundParameterTypeBaseSideEffect |
| Category | via superCategory | CategorySideEffect |
| ConversionBasedUnit | via referenceUnit | ConversionBasedUnitSideEffect |
| DerivedQuantityKind | via quantityKindFactor.quantityKind | DerivedQuantityKindSideEffect |
| DerivedUnit | via unitFactor.unit | DerivedUnitSideEffect |
| IterationSetup | via sourceIterationSetup | IterationSetupSideEffect |
| MeasurementScale | via mappingToReferenceScale.referenceScaleValue.container or mappingToReferenceScale.dependentScaleValue.container | MeasurementScaleSideEffect |
| SiteReferenceDataLibrary | via requiredRdl | SiteReferenceDataLibrarySideEffect |
| SpecializedQuantityKind | via general | SpecializedQuantityKindSideEffect |
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