Remigijus Gustas. Department of Information Systems, Karlstad University, Sweden

Transcription

1 Department of Information Systems, Karlstad University, Sweden

2 Underlying principles of conventional Conceptual Modeling Approaches EM methods distinguish disparate views/dimensions (Zachman, 1987). UML individual diagram types are clear enough, but the semantic integration principles are quite vague. Traditional way of modeling creates difficulties in reaching integrity and consistency among various diagram types. 2

3 Modeling Approach: Integration of Static and Dynamic Aspects Enterprise system is defined as a set of interacting, loosely coupled subsystems, Interaction and value flows can be explicitly captured, When subsystems interact, they cause certain classes of objects to change. Changes are manifested via properties, which are represented by class attributes, Interactive, structural and behavioral aspects of conceptualizations are combined together in a single view. 3

4 Description of a conference management system One of the authors plays the role of contact person who submits a paper to a conference. The responsibility of a conference program committee (PC) chair is to appoint reviewers for every submission. The reviewer is obliged to return review of paper to the PC chair on time. Depending on the reviewing outcome, the PC Chair is authorized to accept or reject a submitted paper. If the paper is accepted, then revision instructions are sent to the corresponding contact person. Otherwise, reviewer comments are included in the rejection letter. 4

5 Interactions of a conference review management system 5

6 Activities in a conference review management system 6

7 Use case diagram Submit Accept, Reject PC Chair Return Appoint ers Make Acceptance Decisions Conference Management System Send Reject Decision <<extend>> <<include>> <<extend>> Send Accept Decision Receive <<include>> Distribute Submissions <<include>> Manage Account Send Paper to er Approve Submission <<extend>> <<extend>> <<include>> Paper Contact Person Receive Decision Register Submission Approve Terms <<include>> Send er 7

8 Activities in a conference review management system 8

9 Events and Transitions of a Paper Object 9

10 Identification of interaction flows and static dependencies among actors Author Submission Submit Contact Person Accept Revision Instructions Conference Reject Rejection Letter PC Chair Documents Appoint ers er Return 10

11 Flows can be Information, Material or Control Agent Flow Action Recipient Agent Flow Action Recipient Agent Action Recipient 11

12 Examples of Service Interactions 12

13 Basic SO Modeling Constructs 13

14 Representation of Interactive and Behavioral Aspects of Conceptualizations Submit PC Chair Documents Paper Appoint ers Submission Paper Submitted Accepted Paper ed Paper In er Contact Person Accept Reject Revision Instructions Rejection Letter PC Chair Return 14

15 Action Subsystem Flow Flow Action Subsystem Subsystem Action Flow Action Flow Subsystem Action 15

16 Complementary Interactions 16

17 Diagram with the alternative Withdraw action 17

18 Four cases of Withdraw in State-Transition Diagram 18

19 Classes, Attributes and Associations 19

20 Four cases of Withdraw in Activity Diagram 20

21 Pragmatic and Semantic Dimensions of Service Architectures Helps to motivate business solutions in terms of goals, problems and opportunities. Integrated representation of static and dynamic aspects of SO specifications is defined on the semantic level. Implementation specific design (for instance, OO modeling). 21

22 Service-Oriented Analysis Process 1) Identification of problems, goals and opportunities, 2) Refinement of pragmatic entities in terms of service interactions, 3) Identification of interaction flows and static dependencies among actors, 4) Definition of actions in terms of transition dependencies, 5) Identification of a noteworthy semantic difference in every action, 6) Refactoring, 7) Adding the alternative actions. Prima Gustiené, 22

23 1) Identification of problems, goals and opportunities Sharp Competition among Conferences (-) Strong Research Community (+) Interesting Presentations g Participant Conference g Top Conference in the Field (-) g Low Price Highly Ranked Proceedings Well Organized PC Chair Sufficient Number of Quality Submissions Flexible Conference Management System Author g Simple Paper Submission Efficient Management er 23

24 2) Refinement of pragmatic entities in terms of service interactions Prima Gustiené, 24

25 3) Identification of interaction flows and static dependencies among actors Author Submission Submit Contact Person Accept Revision Instructions Conference Reject Rejection Letter PC Chair Documents Appoint ers er Return Prima Gustiené, 25

26 4) Definition of actions in terms of transition dependencies Submit PC Chair Documents Paper Appoint ers Submission Paper Submitted Accepted Paper ed Paper In er Contact Person Accept Revision Instructions PC Chair Return Prima Gustiené, 26

27 5) Identification of a noteworthy semantic difference in every action Prima Gustiené, 27

28 6) Refactoring Prima Gustiene, 28

29 7) Adding the alternative actions Person Withdraw Register Person Author Submit Accept Conference Contact Person Reject er PC Chair Appoint ers er Terminate er Return Register er Prima Gustiené, 29

30 Conclusions Most information system design methodologies fail to link interactions with state changes in terms of triggering effects. The presented modeling approach introduces a single type of diagram. It is capable to capture, in concise form, the semantics of the behavioral effects and structural changes, which are justified by the interaction flows. Using a semantically integrated way of modeling helps to detect inconsistencies and incompleteness of conceptualizations. The similarity of conceptual models before and after adding evolutionary requirements, demonstrates the stability of the proposed modeling approach (in comparison with UML). 30