2. Business. Architecture. Service-Oriented. Architecture

Transcription

1 2. Business Architecture Service-Oriented Architecture Winter Semester 2009/2010 Prof. Dr. Bernhard Humm Darmstadt University of Applied Sciences Department of Computer Science 1 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

2 The lecture in the context of the entire course 1. Introduction 2. Business architecture 3. Designing domains 4. Designing components 5. Designing interfaces and operations 6. Excursus: business information systems 7. Loose coupling 8. Web Services 9. Service orchestration - BPEL 10.Integration Platforms 11.Evolution of application landscapes 2 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

3 Agenda Enterprise architecture framework framework Business goals Business dimensions Business services Business objects Summary Literature

4 Enterprise architecture framework (1/6): Separating Business from IT The diagrams presented ( Quasar Enterprise roadmap ) are based on Capgemini s Integrated Architecture Framework (IAF) 4 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

5 Enterprise architecture framework (2/6): Separating requirements from implementation 5 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

6 Enterprise architecture framework (3/6): Separating information systems from technical infrastructure 6 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

7 Enterprise architecture framework (4/6): Separating levels of granularity 7 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

8 Enterprise architecture framework (5/6): Considering evolution over time AS IS TO BE IDEAL 8 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

9 The task of an enterprise architect is similar to the one of a settler Explore resources Plan / Build Evolve Source: Ubisoft Die Siedler 9 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

10 Technical Reference Architecture Enterprise architecture framework (6/6): Methodologies for developing application landscapes AS IS TO BE IDEAL Integration 10 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

11 Technical Reference Architecture Business architecture in the context of the enterprise architecture framework AS IS TO BE IDEAL Integration 11 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

12 Agenda Enterprise architecture framework Business goals goals Business dimensions Business services Business objects Summary Literature

13 Business goals of Christopher Columbus Travel (CCT) 13 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

14 Definition business goal A business goal describes a fundamental contribution towards the intended business purpose of an enterprise. All business goals together define what an enterprise has to udertake in order to fulfil its intended business purpose. All activities undertaken within an enterprise must follow at least one business goal. 14 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

15 Agenda Enterprise architecture framework Business goals Business dimensions Business services Business objects Summary Literature

16 Business dimensions of Christopher Columbus Travel (CCT) Customers / Markets... - Premium brand - Budget brand Products Package tour - Custom tour e.g., - Travel agency - own hotels - Internet - purchase in advance - Call Center - purchase on demand Length of Value Chain Customer Channels 16 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

17 Definition business dimension Business dimensions define the characteristic properties of an enterprise s business. Their values reflect the business goals of an enterprise. 17 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

18 Agenda Enterprise architecture framework Business goals Business dimensions Business services services Business objects Summary Literature

19 Services in a travel agency Information and sales custom tours 19 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

20 Business services of Christopher Columbus Travel (CCT) Level 1 Level 2 20 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

21 Definition business service A business service is a unit of business behaviour. It defines an achievement of a service provider towards a service consumer. The service provider is a unit of an enterprise. The service consumer is a customer or a partner company or another unit within the same enterprise. A business service is based on a contract. It defines the in- and out-going information and goods. It also describes the set of actions that are to be performed. Furthermore, relevant constraints are defined. 21 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

22 A method for modelling business services Business IT Identify top-level business services Straight forward since top-level business services are generic, e.g., plan, purchase, produce, sell, service Modelling business services Identify service actions The actions of a service are the candidates for the next finer-grained business services Business services Refine business services Refine if: (a) There are multiple service providers (b) The service supports multiple business goals Specify business services Specify contract 22 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

23 Business services hierarchy of Christopher Columbus Travel (CCT) 23 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

24 Service specification Name External view Service consumer Triggering Event / Business objects consumed / Pre-conditions Actions / Service protocol Result / Business objects produced / Post-conditions Non-functional requirements Compute price Customer Price request by customer. Custom tour has already been composed. Plausibility and availability have been checked. One action compute only Total price for custom tour in EUR. Reductions have benn regarded. Response time < 1 s Internal view Process 1. Compute prices of individual travel components 2. Compute reductions 3. Sum up 24 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

25 Business services and business processes uses 25 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

26 Agenda Enterprise architecture framework Business goals Business dimensions Business services Business objects objects Summary Literature

27 Level 1 business objects of Christopher Columbus Travel Level 1 27 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

28 Definition business object A business object represents a real object in the business of an enterprise. They can be tangible (e.g., an order form) or intangible (e.g., the order memorized by the waiter in a resturant) 28 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

29 Business services consume and produce business objects Business objects consumed Business objects produced Compose travel Product Customer Order (status offered) Book travel Order (status offered) Order (status booked) Resource Transact payment Order (status booked) Invoice 29 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

30 Agenda Enterprise architecture framework Business goals Business dimensions Business services Business objects Summary Literature

31 derived from Business goal Contextual (Why?) details derived from Architectual guideline Requirement aims at aims at exactly one Meta model business architecture Conceptual (What?) influences design of refines Business service Business dimension on finest level of granularity Performed by exactly one Role reflects Elementary business service consumes produces Business object interacts with realized by uses describes assigned to Information object Logical (How?) Business process Activity on finest level of granularity Elementary activity refines has Organizational unit influences design of 31 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

32 Method overview: business architecture Identifying and refining business services Kunde CKR Individualreise zusammenstellen Individualreise buchen Individualreise bezahlen Vertrag - Kunde erklärt Einverständnis zur Speicherung seines Suchverhaltens im Online- Katalog. Vertrag - Reisedokumente werden erst nach erfolgter Anzahlung versandt - Reiserücktritt nur bis 30 Tage nach Buchung möglich. - Bei Reiserücktritt fallen Gebühren an. Individualreise durchführen Vertrag - Bei Rücklastschrift wegen Kontounterdeckung fallen Gebühren an. Vertrag - Keine Haftung für Transfer vor Ort. 32 Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/

33 Agenda Enterprise architecture framework Business goals Business dimensions Business services Business objects Summary Literature

34 Literature Gregor Engels, Andreas Hess, Bernhard Humm, Oliver Juwig, Marc Lohmann, Jan-Peter Richter, Markus Voß, Johannes Willkomm: Quasar Enterprise Anwendungslandschaften serviceorientiert gestalten. dpunkt-verlag Chapter 4: Geschäftsarchitektur Bernhard Humm: Was ist eigentlich ein Service? GI-Workshop Software Architektur Softwaretechnik-Trends Band 28, Heft 4, S Gesellschaft für Informatik, Nov Prof. Dr. Bernhard Humm, Darmstadt University of Applied Sciences, WS 09/