BryanWood@Open-ITcouk

1、UML for ODP system specificationsBryan Wood Convenor, JTC1/SC7/WG19Bryan.WoodOpen-IT.co.ukITU-T/SG 17 Geneva, 14 March 200415 March 20001Use of UML for ODP system specifications - X.906 | ISO/IEC 19793A standard covering:definition of a set of UML profiles for expressing a system specification in te

2、rms of ODP viewpoint specificationsrelationships between the resultant ODP viewpoint specifications relationships between a system specification using ODP viewpoint specifications and the OMG Model Driven Architecture 15 March 20002The Reference Model of ODPA framework for ODP standardization and sy

3、stem specification covering all aspects of distributed systems (“enterprise” context, functionality, infrastructure, technology) and comprisinga comprehensive and coherent set of object-oriented modelling conceptsa structure for specifications in terms of viewpoints on a systema language (concepts a

4、nd rules) for expressing each viewpoint specification 15 March 20003Modelling conceptsInterpretation conceptsentity, abstraction, system, architectureBasic modelling conceptsobject, action, environment (of an object), interface, activity, location (in space/time) Specification conceptscomposition/de

5、composition (of objects), type (of an ), template, role 15 March 20004Modelling conceptsOrganisational conceptsconfiguration (of objects), group, domainProperties of systems and objectstransparency, contracts, QoS, policy and prescriptions on behaviour, Naming conceptsName, identifier, name space,na

6、me resolutionBehaviour conceptsactivity structure, contractual behaviour, causality, binding, dependability15 March 20005ViewpointsDifferent abstractions of the same systemreflect different concernsexpressed in terms of specific viewpoint concepts and rules (viewpoint languages) based on the foundat

7、ion modelling conceptsA mechanism for dealing with the complexity of distributed systems15 March 20006Viewpoint SpecificationsSpecifications of a system from different viewpointsrelated and mutually consistentUsing the viewpoint languages and the foundation modelling concepts15 March 20007ODP viewpo

8、int specifications - different concernsSystemEnterpriseComputationInformationTechnologyEngineering15 March 20008The enterprise specificationSpecifies the roles played by an system in its organisational environmentAn object model of a social/commercial organisation in terms of:enterprise objectscommu

9、nities (of enterprise objects)objectivesbehaviour roles processespolicy15 March 20009The information specificationSpecifies system behaviour abstracted from implementation An object model of the system describing the semantics of information and of information processing in the system in terms of:in

10、formation objectsinvariant schema - predicates on information objects that must always be true static schema - state of information objects at some location in timedynamic schema - allowable state changes of information objects 15 March 200010The computational specificationSpecifies computational st

11、ructure in terms of units of distribution and portability and their interactions abstracted from the detail of how distribution is accomplishedAn object model of the system describing the structure of processing in terms of:computational objectsinterfaces: operations supportedinvocations:operations

12、invokedactivities:sequences of invocationscomputational bindings 15 March 200011The engineering specificationSpecifies the mechanisms and services that provide the distribution transparencies and QoS constraints required by the system An object model of the system describing the infrastructure suppo

13、rting the computational structurebasic engineering objects(infrastructure) engineering objects clusters, capsules, nodes channelsfunctions15 March 200012The technology specificationSpecifies the procurable pieces from which the system is built. An object model of the systemdefining the configuration

14、 of technology objects and the interfaces between them that comprise the ODP systemidentifying conformance points15 March 200013An ODP system specification- object configuration- interactions between objects at interfacesComputationalEnterprise- business context- business processes - information- ch

15、anges to information- constraintsInformationEngineering hardware and software components implementing the systemTechnology- mechanisms and services to provide the required distribution transparencies and QoS constraints.15 March 200014ODP system specifications and UMLRM-ODP defines clear and compreh

16、ensive concepts and a framework supporting system specificationRM-ODP does not define a notation for expressing a system specificationUML defines a notation for system specificationUML does not define clear and comprehensive concepts and a framework supporting system specification15 March 200015UML

17、Profiles for ODP Viewpoints e.g. We dont say “this class models Fred”We say “this class maps to this EO, whichmodels Fred”Universeof Discourse(UOD)ODPViewpoint specificationUMLViewpoint modelUMLnotationmodels“models” (notdefined)maps to(through a profile)expresses“expresses” (not explicitly defined)

18、15 March 200016ODP system specifications and the OMG Model Driven ArchitectureA system specification that is compliant with the RM-ODP also satisfies the requirements of the MDA. Specifically:the enterprise specification is a computation independent model (CIM)the information, computational and engi

19、neering specifications together form a platform independent model (PIM), where clause 8 of the RM-ODP Part 3 defines a virtual machine which is the context for platform independencethe technology specification is a platform specific model (PSM)the correspondences between the viewpoint specifications express the transformations by means of which one model is derived from another.15 March 200017Who needs the standard?Needed by system specifiersNeeded for communication between system specifiersNeeded for communication between stakeholders and implementorsNeeded for a stable business functiona