A scalable, distributed middleware service architecture to support mobile internet applications

ABSTRACT

Middleware layers placed between user clients and application servers have been used to perform a variety of functions. In previous work we have used middleware to perform a new capability, application session handoff, using a single Middleware Server to provide all functionality. However, to improve the scalability of our architecture, we have designed an efficient distributed Middleware Service layer that properly maintains application session handoff semantics while being able to service a large number of clients. We show that this service layer improves the scalability of general client-to-application server interaction as well as the specific case of application session handoff. We detail protocols involved in performing handoff and analyse an implementation of the architecture that supports the use of a real medical teaching tool. From experimental results it can be seen that our Middleware Service effectively provides scalability as a response to increased workload.

REFERENCES

• 1: Thomas E. Anderson , David E. Culler , David A. Patterson , and the NOW team, A Case for NOW (Networks of Workstations), IEEE Micro, v.15 n.1, p.54-64, February 1995 [doi>10.1109/40.342018]
• 2: Daniel Andresen , Tao Yang , Oscar H. Ibarra, Toward a scalable distributed WWW server on workstation clusters, Journal of Parallel and Distributed Computing, v.42 n.1, p.91-100, April 10, 1997 [doi>10.1006/jpdc.1997.1305]
• 3: R. Bagrodia, M. Gerla, S. Lu, R. Meyer, D. Valentino, and L. Zhang. Supporting nomadic healers. In UCLA Technical Report 200021, 2000.
• 4: Andy Bond , Matthew Gallagher , Jadwiga Indulska, An Information Model for Nomadic Environments, Proceedings of the 9th International Workshop on Database and Expert Systems Applications, p.400, August 26-28, 1998
• 5: E. Brewer, R. Katz, E. Amir, H. Balakrishnan, Y. Chawathe, A. Fox, S. Gribble, T. Hodes, G. Nguyen, V. Padmanabhan, M. Stemm, S. Seshan, and T. Henderson. A network architecture for heterogeneous mobile computing. IEBB Personal Communications, October 1998.
• 6: T. Chou and J. Abraham. Load balancing in distributed systems. IBEE Transactions on Software Engineering, July 1982.
• 7: GloMoSim. The homepage for the global mobile information systems simulation library. In http://pcl.cs.ucla.edu/projects/glomosim/.
• 8: Charles F. Goldfarb , Paul Prescod, The XML handbook, Prentice Hall PTR, Upper Saddle River, NJ, 1999
• 9: Erik Guttman, Service Location Protocol: Automatic Discovery of IP Network Services, IEEE Internet Computing, v.3 n.4, p.71-80, July 1999 [doi>10.1109/4236.780963]
• 10: A. D. Joseph , A. F. de Lespinasse , J. A. Tauber , D. K. Gifford , M. F. Kaashoek, Rover: a toolkit for mobile information access, Proceedings of the fifteenth ACM symposium on Operating systems principles, p.156-171, December 03-06, 1995, Copper Mountain, Colorado, United States
• 11: M. Litzkow, M. Livny, and M. Mutka. Condor - a hunter of idle workstations. In Proceedings of the 8th International Conference of Distributed Computing Systems, June 1988.
• 12: Brian D. Noble , M. Satyanarayanan , Dushyanth Narayanan , James Eric Tilton , Jason Flinn , Kevin R. Walker, Agile application-aware adaptation for mobility, Proceedings of the sixteenth ACM symposium on Operating systems principles, p.276-287, October 05-08, 1997, Saint Malo, France
• 13: Thomas Phan , Richard Guy , Jing Gu , Rajive Bagrodia, A New TWIST on Mobile Computing: Two-Way Interactive Session Transfer, Proceedings of the Second IEEE Workshop on Internet Applications (wiapp '01), p.2, July 23-24, 2001
• 14: T. Phan, K. Xu, It. Guy, and R. Bagrodia. Handoff of application sessions across time and space. In Proceedings of the IEEE International Conference on Communications (ICC 2001), June 2001.
• 15: Behrooz A. Shirazi , Krishna M. Kavi , Ali R. Hurson, Scheduling and Load Balancing in Parallel and Distributed Systems, IEEE Computer Society Press, Los Alamitos, CA, 1995
• 16: Anand R. Tripathi , Tanvir Ahmed , Vineet Kakani , Shremattie Jaman, Distributed Collaborations Using Network Mobile Agents, Proceedings of the Second International Symposium on Agent Systems and Applications and Fourth International Symposium on Mobile Agents, p.126-137, September 13-15, 2000
• 17: D. Valentino. Considerations in implementing large-scale pacs. In Conference on RIS, PA CS and Teleradiology: Future-Proof Solutions, 1998.
• 18: Jim Waldo, The Jini architecture for network-centric computing, Communications of the ACM, v.42 n.7, p.76-82, July 1999 [doi>10.1145/306549.306582]

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Wireless communication

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.4 Distributed Systems
          Subjects: Client/server

General Terms:
Design, Experimentation, Performance