Adaptable UI for Web Service Composition A Model-driven Approach

Transcription

1 Waldemar P. Ferreira Neto and Philippe Thiran (Supervisor) PReCISE Research Center, University of Namur ICSOC 2011-PhD Symposium December 5, 2011 Paphos, Cyprus

2 Agenda! Motivation! Research Challenges! Proposed Approach! Research Methodology! Conclusion 2

3 Motivation Web Service Composition (WSC) and the Users! This work is focused on WSC based on orchestration! In many WSC scenarios users are involved User Interfaces (UI) are required! How can we develop UI for WSC? 3

4 Motivation Developing Efficiently of User Interfaces for WSC! UI development must to exploit the data/control flow of the WSC A specific description of the UI for a WSC is redundant and difficult to evolve! The navigation of the UIs is driven by the WSC execution The WSC has the responsible to orchestrate the whole WSC process! The UI must allow adaptation to a specific context of use The users of a WSC access it through diverse devices and modalities 4

5 Motivation Comparison of Works on UI for WSC! There are works that provide user interfaces to WSC Web engineering Approaches Methods based on Web service description Methods based on Annotated Web Services and Task Model Methods based on BPEL extensions Exploit the data/control flow Coordinated with the WSC Partially Partially No Partially No Yes No Partially Yes No Yes No Adaptable UI 5

6 Research Challenges Definition! How can an adaptable UI be derived and coordinated with its WSC? Receive Travel Information WS Choosing Mean of Transformation by flight by driving WS Flight Booking Receive License Number! Illustration: travel reservation management WS Car Renting WS Confirm Reservation 6

7 Research Challenges Integration of User Interactions and WSC Receive Travel Information WS Choosing Mean of Transformation! How can interactions between the user and the WSC be specified? by flight WS Flight Booking by driving Receive License Number WS Car Renting! Which do types of user interactions must be specified within WSC? WS Confirm Reservation 7

8 Research Challenges Integration of User Interactions and WSC Receive Travel Information WS Choosing Mean of Transformation! How can interactions between the user and the WSC be specified? by flight WS Flight Booking by driving Receive License Number WS Car Renting! Which do types of user interactions must be specified within WSC? WS Confirm Reservation 8

9 Research Challenges Integration of User Interactions and WSC Receive Travel Information WS Choosing Mean of Transformation! How can interactions between the user and the WSC be specified? by flight WS Flight Booking by driving Receive License Number WS Car Renting! Which do types of user interactions must be specified within WSC? WS Confirm Reservation 9

10 Research Challenges Integration of User Interactions and WSC Receive Travel Information WS Choosing Mean of Transformation! How can interactions between the user and the WSC be specified? by flight WS Flight Booking by driving Receive License Number WS Car Renting! Which do types of user interactions must be specified within WSC? WS Confirm Reservation 10

11 Research Challenges Integration of User Interactions and WSC Receive Travel Information WS Choosing Mean of Transformation! How can interactions between the user and the WSC be specified? by flight WS Flight Booking by driving Receive License Number WS Car Renting! Which do types of user interactions must be specified within WSC? WS Confirm Reservation 11

12 Research Challenges Coordination of the UI and the WSC execution Receive Travel Information WS Choosing Mean of Transformation! The navigation on UI is driven by the WSC execution by flight WS Flight Booking by driving Receive License Number WS Car Renting WS Confirm Reservation 12

13 Research Challenges Coordination of the UI and the WSC execution Receive Travel Information WS Choosing Mean of Transformation! The navigation on UI is driven by the WSC execution by flight WS Flight Booking by driving Receive License Number WS Car Renting WS Confirm Reservation 13

14 Research Challenges Generic UI! The same user interaction can be performed be different ways Depending on the context of use! For instance: a user interaction to provide data For a user in a Web browser HTML form For a user in a Smartphone specific application 14

15 Proposed Approach Overview! We propose a MDE approach to deal with these challenges Models Transformations 15

16 Proposed Approach Overview! We propose a MDE approach to deal with these challenges! Exploiting the models we can Why MDE? integrate the WSC and the user interaction UI-WSC describe a generic UI Abstract User Interface Concrete User Interface! Exploiting the transformations we can derive a generic UI from its WSC adapt a generic UI to a specific context of use add a tooling support to coordinate the WSC execution and UI navigation 16

17 Proposed Approach Coordination of the UI and WSC Receive Travel Information WS Choosing Mean of Transformation! Mechanism responsible to: Present the correct UI corresponding to user interactions required by the WSC WS Flight Booking by flight by driving Receive License Number WS Car Renting WS Confirm Reservation 17

18 Proposed Approach Coordination of the UI and WSC Receive Travel Information WS Choosing Mean of Transformation! Mechanism responsible to: Present the correct UI corresponding to user interactions required by the WSC Send the information from the WSC to feed the UI WS Flight Booking by flight by driving Receive License Number WS Car Renting WS Confirm Reservation 18

19 Proposed Approach Coordination of the UI and WSC Receive Travel Information WS Choosing Mean of Transformation! Mechanism responsible to: Present the correct UI corresponding to user interactions required by the WSC Send the information from the WSC to feed the UI Send the information provided by the user via the UI to the WSC WS Flight Booking by flight WS Confirm Reservation by driving Receive License Number WS Car Renting 19

20 Research Methodology Steps! We defined the following steps to accomplish our proposed contribution Step 1: Model Proposition Step 2: AUI Derivation Step 3: WSC and UI coordination Step 4: UI Adaptation Step 5: Proof of Concept Step 6: Evaluation 20

21 Research Methodology Step 1: Model Proposition! Identification of types of user interaction! Definition or adoption of the different models of our MDE approach: UI-WSC Abstract User Interface Concrete User Interface 21

22 Research Methodology Step 2: AUI Derivation! Definition of the transformation rules for deriving an AUI description from a UI-WSC model! These rules are been proposed through an incremental way Direct mapping: one user interaction is mapped into one component in the UI Complex mapping: many user interaction are mapped into a same component in the UI 22

23 Research Methodology Step 3: WSC and UI coordination! Defining the mechanism to coordinate the UI and WSC: An review about the mechanisms proposed by others approaches: BPEL4UI, OOWS, etc. Adapt these mechanisms to our approach 23

24 Research Methodology Step 4/5: UI Adaptation and Proof of Concept! There are existing approaches: UsiXML TeREZA Contextualized MDE! The partial evaluation of our models and transformations are done by use cases! This use case must to Require all types of user interactions Be adopted by other works 24

25 Research Methodology Step 6: Evaluation! We aim at evaluating our approach against other approaches. MaRIA! As comparison criteria satisfaction effectiveness efficiency! We also aim at evaluating our approach in real scenarios with real users 25

26 Conclusion Current Status! We identified the user interactions: Data input interaction, data output interaction, data selection interaction, and user interaction based on event! We proposed an extension to BPEL in order to express user interaction UI-BPEL No BPEL extension can express all types of user interaction! Prototype tool able to design UI-BPEL process! Initial set of transformation to derive AUI models AUI UsiXML Framework! Initial set of transformations to configure the coordination between the UI and WSC! Initial demonstration of our approach Purchase order WSC 26

27 Conclusion Future Steps! Refining the Step 2: Review the literature about the derivation of the navigation and composition of UI Improve the transformation to derive AUI by grouping user interactions in a same UI component! Refining the Step 3: Complete Coordination 27

28 Thank You Questions? 28

29 Appendix BPEL meta-model 29

30 Appendix UI-BPEL meta-model 30