Middleware for Ubiquitous Computing

Transcription

1 Middleware for Ubiquitous Computing Software Testing for Mobile Computing National Institute of Informatics Ichiro Satoh Abstract When a portable computing device is moved into and attached to a new local network, the proper functioning of software running on the device often depends on the resources and services provided locally in the current network. The framework provides an application-level emulator of portable computing devices as a mobile, which can travel over networks. The emulator can carry its target software among networks on behalf of a device and it allows the software to connect to servers in its current network in the same way as if they were moved with and executed on the device itself.

2 Background Mobile devices enables software running on them to access local area networks in their current locations through wired or wireless networks. Local network A step 2. movement step 1. disconnection step 3. connection Local Pinter Local network B Local Database The proper functioning of such software is dependent on the current networks and locations. To construct a correct software, the developer must test the software in the networks that the device might be connected to. Wireless Network Area Wireless Network Area Wireless Network Area

3 Approach The physical mobility of devices is emulated by the logical mobility of their corresponding software-based emulators and target software. local servers Target Software local servers Target Software local area network C local area network C Mobile based emulator local servers local servers local area network B local servers movement local area network B local servers migration local area network A local area network A

4 Design and Implementation Software-based emulators for mobile devices are constructed as mobile s. Mobile Agent-based Emulator Application Control Itinerary Control Target Software User Interface Target Software File Storage Target Software Network Interface Resources Access Point Host Mobile Agent Runtime System Java VM / OS / Hardware Local Network local servers Target Software The emulator s itinerary local network C Access Point Host Remote Control Server local servers Access Point Host local network B local servers local network A Access Point Host The emulators can carry their target software between networks and enable the software to access servers in the current networks.

5 Experiences Execution on the Flying Emulator Execution on the Target Computing Device Software tested successfully in the emulator can be performed on the target device in the same way without being modified or recompiled them. Databases Local network A Applications Emulator Access Point Host Logical Migration of the -based emulator Access Point Host Databases Local network B Remote Control Server Databases Local network A Physical Migration of the Portable device The developer can view/operate the user interfaces of the target applications on/from the remote control server by using IBM's RAWT toolkit. Databases Local network B

6 Experiences Testing Software for PDAs Testing Ubiquitous Computing Software Mobile Emulator target PDA Ubiquitous computing devices are managed by multicast-based mechanisms, such as Jini and UPnP. discovery server multicast movement and activation network domain Testing Software for Wearable Computers Remote Control Server Screenshot of HMD The plug-and-play operation of a device is emulated by the logical mobility of an emulator for the device. discovery server multicast emulator migration network domain

7 Middleware for Ubiquitous Computing Bridging between Physical and Virtual Worlds National Institute of Informatics Ichiro Satoh People, things, and places are spatially bound with mobile s for controlling and annotating them. The goal is an seamless integration between the physical worlds and cyberspaces. Link communication cyberspace 1 movement cyberspace 2 movement physical world 1

8 Mobile Agent Each mobile is an autonomous program that can travel from computer to computer under its own control. Step 1 state code Mobile Agent suspension of execution Computer A network Computer B Step 2 state code migration Computer A network Computer B Step 3 Mobile Agent resumption of execution state code Computer A network Computer B

9 Bridging the Movements of Physical Entities and Mobile Agents Spatially Binding Cyber-entities to Spaces Each place can have more than one cyber-entity. Step 1 a user goes near to a place Step 2 place-bound entities moves to a visiting computer place dynamic deployment place place-bound cyber-entities Spatially Binding Cyber-entities to Moving Entities Each physical entity, such as person and object can have more than one cyberentity Step 1 user-bound cyber-entities place A a user moves to another place place B user-bound cyber-entities Step 2 place A cyber-entities follow the moving user place B

10 Design and Implementation Management of a variety of location-sensors. Deployment of s at computers near to the tags that the s are bound to. Location Information Server Location Information Server RF or infrared locating systems location information database profile handler event handler sensor abstraction layer Peer-to-peer based sensor Plug-and-Play abstraction Manager layer peer-to-peer connection location information database profile handler Peer-to-peer based sensor Plug-and-Play abstraction Manager layer locating sensor locating sensor locating sensor server desk-lamp desk-lamp bound migration bound entity entity RF-tag movement RF-tag user bound cyber-entity RF-tag RF-tag migration a user moves to another place user bound cyber-entity RF-tag RF-tag space A space B space C

11 Experiences User Navigation System Guide-s are bound to particular users to assist the users. The s are automatically migrated to the nearest computer from the current positions of the users. the movement of the physical objects Cyber entity Cyber entity Computer C Computer B cyber-entity migration Computer A User Navigation System in a Hospital A computer vision-based tracking of users. START user camera wall-mounted display user assistant computer camera camera GOAL computer user assistant

12 Publication Refereed Papers (in 2001) Ichiro Satoh, "Adaptive Protocols for Agent Migration", Proceedings of IEEE International Conference on Distributed Computing Systems (ICDCS'2001), pp , IEEE Computer Society, April, Ichiro Satoh, "Network Processing of Mobile Agents, by Mobile Agents, for Mobile Agents", Proceedings of 3rd International Workshop on Mobile Agents for Telecommunication Applications (MATA'2001), Lecture Notes in Computer Science (LNCS), Vol.2146, Springer, pp.81-92, August, Ichiro Satoh, "MobiDoc: A Mobile Agent-based Framework for Compound Documents", Informatica (International Journal of Computing and Informatics), Vol.25, No. 4, pp , Ichiro Satoh, "Mobile Agent-based Compound Documents", Proceedings of ACM Symposium on Document Engineering (DocEng'2001), pp.76-84, ACM Press, November, Ichiro Satoh, "Flying Emulator: Rapid Building and Testing of Networked Applications for Mobile Computers", Proceedings of 5th International Conference on Mobile Agents (MA'2001), Lecture Notes in Computer Science (LNCS), Vol. 2240, pp , Springer, December, Refereed Papers (in 2002) Ichiro Satoh, "Dynamic Configuration of Agent Migration Protocols for the Internet", Proceedings of International Symposium on Applications and the Internet (SAINT'2002), IEEE Computer Society, pp , January, Ichiro Satoh, "A Framework for Building Reusable Mobile Agents for Network Management", Proceedings of Network Operations and Managements Symposium (NOMS'2002), pp.51-64, IEEE Communication Society, April, Ichiro Satoh, "Physical Mobility and Logical Mobility in Ubiquitous Computing Environments", Proceedings of 6th International Conference on Mobile Agents (MA'2002), LNCS, Vol. 2535, pp , Springer, October, Refereed Papers (in 2003) Ichiro Satoh, "Software Testing for Mobile and Ubiquitous Computing", to appear in 6th International Symposium on Autonomous Decentralized Systems, pp , IEEE Computer Society, April, Ichiro Satoh: "Configurable Network Processing for Mobile Agents on the Internet", Cluster Computing, Vol. 6, No.? (Accepted), Kluwer, Ichiro Satoh, "Testing Mobile Wireless Applications", Proceedings of Personal Wireless Communications (PWC'2003), LNCS, Vol.?, September, Ichiro Satoh, "Building Reusable Mobile Agents for Network Management", to appear in IEEE Transactions on Systems, Man and Cybernetics, Vol.33, No. 3, Ichiro Satoh: "SpatialAgents: Integrating User Mobility and Program Mobility in Ubiquitous Computing Environments", Wireless Communications and Mobile Computing, Vol.3, No.3 (Accepted) Wiley, Contact: ichiro@nii.ac.jp