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====== UbiNet Internship 2010 ======



===== Who? =====

Name: Jean-Yves Tigli and Stéphane Lavirotte

Mail: tigli@polytech.unice.fr, lavirott@unice.fr

Telephone: +33684245567

Web page: www.tigli.fr, www.lavirotte.com


===== Where? =====

Place of the project: I3S, Bât Templier of Polytech'Nice sophia Antipolis

Address: 930 route des Colles, 06903 Sophia Antipolis cedex

Team: Rainbow

Web page: rainbow.i3s.unice.fr


===== What? =====

==== Title: ====
 
== Detailled Description: ==

Ubiquitous Computing, introduced by Mark Weiser in 1991, raised many
challenges across computer science: in systems design and engineering, 
in systems modeling, and in user interface design. Initially the
effective integration and interaction with the physical world sufficed
to promote ubiquitous computing interest due to significantly increased
real world visibility as well as real world control, towards ambient
intelligence. But these first ubiquitous systems were often proofs of
concept with a single static configuration with a priori known devices.

Web service technology is a representative means of heterogeneous 
system integration and communication. Process language standards, such as 
WS-BPEL and WS-CDL, have accelerated the usability of web services in 
business area. However, recently emerging web service devices in ubiquitous 
environments still have a difficulty in coordinating their processes because of 
the limited computing power and storage. This research proposes a framework 
of event-based process enactment for ubiquitous web service devices. The 
framework adopts P2P architecture where devices communicate with one 
another via web services eventing. The schema of ECA rules and messaging 
protocol are presented for P2P process enactment so that service devices can 
interact each other and accomplish their process execution based on the ECA 
rules. Our proposed framework is expected to be useful in ubiquitous service 
environments since it enables a scalable and light-weighted process enactment 
through event-based web service technology.


Today mobility of users and an increasing heterogeneity of devices
introduce a new significant challenge for Middleware for ubiquitous
computing. We witness to a kind of inversion in the classical software
methodology where the software applications levels are much more stable
and stationary than the software infrastructure level. The operational
environment is then tightly connected with the real world but is also
partly unknown at design time and is always changing at runtime in
uncountable manner.
In order to to adress ubiquitous services continuity (Cf. French
national research project CONTINUUM, http://continuum.unice.fr) in spite
of such constraints, recent researches are moving towards an era of
emergent middleware that is middleware that emerges at run-time to match
the current operational environment and application requirements.
The research group Rainbow focus on adaptive service oriented middleware
for ubiquitous computing (Cf. main recent publications).
Contrary to most of the researches in this domain, Rainbow studies,
proposes and validates contributions for a reactive adaptation, i.e.
when the time for adaptation remain compatible with the continuous
evolution of the ubiquitous environment.
Its main contribution bases on the theory of the aspects of assembly
(AA) to adapt reactively and independently assemblies of
components in Service Component Architecture (SCA) for example.


**Main objectives of the internship :**


After a short survey on reactivity in adaptive middlewares, the students
of this internship will study in details the evolution of Aspect-oriented system architecture and more particulary, Aspect of Assembly for Component-based architecture.
Then the student will highlight what features of such techniques are "common aspect-oriented concepts" 
and what features are rather target architecture-specific (for example specific to component-based architecture for AA concept). 
After this first part,he will be able to propose : 
- a meta model of service for device and event-based process
- different jointpoint models and corresponding weaving algorithms to react to appearing and disappearing services in the application.
For example, jointpoint would be able to add contextual informations about the ports of the devices. In this case weaving process will 
be able to verify contextual constrains at runtime. 

The student will also consider the algorithmic costs of each weaving process, identifying a formal performance model 
that will allow to compare various solutions.

To illustrate these results, some algorithms would be tested
in real experiments on the CONTINUUM platform, in collaboration with the
research engineer of the project.


== Pre-requisites : ==
Service oriented architecture, Middleware for Ubiquitous Computing 

== References : ==

  * J.-Y. Tigli, S. Lavirotte, G. Rey, V. Hourdin, M. Riveill, “Lightweight Service Oriented Architecture for Pervasive Computing” IJCSI International Journal of Computer Science Issues, Vol. 4, No. 1, September 2009, ISSN (Online): 1694-0784, ISSN (Print): 1694-0814 
  * J.-Y. Tigli, S. Lavirotte, G. Rey, V. Hourdin, M. Riveill, “Context-aware Authorization in Highly Dynamic Environments” IJCSI International Journal of Computer Science Issues, Vol. 4, No. 1, September 2009, ISSN (Online): 1694-0784, ISSN (Print): 1694-0814
  * J.-Y. Tigli, S. Lavirotte, G. Rey, V. Hourdin, D. Cheung, E. Callegari, M. Riveill “WComp middleware for ubiquitous computing: Aspects and composite event-based Web services” dans la revue Annals of Telecommunications, éditeur Springer Paris, ISSN 0003-4347 (Print) 1958-9395 (Online), Vol. 64, No 3-4, March-April 2009


== Duration : ==
4 to 6 months with possible continuation in PhD