System Support for Distributed Collaboration and Mobile Computing

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System Support for Distributed Collaboration and
Mobile Computing
Prasun Dewan
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Scope
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Virtual Environment
VE
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System Support

• Application-Independence
• Efficiency
• Ease of Programming

• Collaborative Applications
• Mobile Applications

Current Projects Potential Projects
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Collaborative Application
Application
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Infrastructure-Supported Sharing
Client
Collaboration Infrastructure
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Architecture?
Infrastructure/client components
Component distribution
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Single-User Layered Interaction
Layer 0
Increasing Abstraction
Communication Layers
PC
Physical Devices
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Single-User Interaction
Layer 0
Increasing Abstraction
PC
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Example Layers
Data
Increasing Abstraction
PC
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Single-User Interaction
Layer 0
Increasing Abstraction
PC
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Identifying the Shared Layer
Higher layers will also be shared
Layer 0
Increasing Abstraction
Lower layers may diverge
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Replicating UI Component
PC
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Centralized Architecture
PC
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Centralized Architecture
PC
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Replicated Architecture
PC
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Replicated Architecture
PC
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Classifying Previous Work

• Shared layer
• X Windows (XTV)
• Microsoft Windows (NetMeeting
• App Sharing)
• VNC Framebuffer (Shared VNC)
• AWT Widget (Habanero, JCE)
• Model (Suite, Groove, PlaceWare,)
• Replicated vs. centralized
• Centralized (XTV, Shared VNC, NetMeeting App.
  Sharing, Suite, PlaceWare)
• Replicated (VConf, Habanero, JCE, Groove,
  NetMeeting Whiteboard)

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Current Project (Chung)

• Dynamic support for arbitrary mappings
• Replicated, Centralized good under different
  conditions
• Conditions can change dynamically

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Dynamic Architecture Adaptations
Program
Program
UI
UI
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Dynamic Architecture Adaptations
Program
Program
UI
UI
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Dynamic Architecture Adaptations
Program
UI
UI
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Dynamic Architecture Adaptations
Program
UI
UI
UI
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Dynamic Architecture Adaptations
Program
UI
UI
UI
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Dynamic Architecture Adaptations
Program
UI
UI
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Dynamic Architecture Adaptations
Program
Program
UI
UI
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Current Project (Chung)

• Dynamic support for arbitrary mappings
• Replicated, Centralized good under different
  conditions
• Conditions can change dynamically

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Possible Project Dynamic Layer Switch

• By switching shared layer, degree of sharing can
  be switched
• Screen sharing
• WYSIWIS
• Window sharing
• WYSIWIS in window
• Data sharing, .
• Independent views

Shared Layer
Mapping (Rep vs Centralized)
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Possible Project Policy

• Currently dynamic switches occur manually
• Automatically?
• Network delay
• Relative computing power
• Application
• ?

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Possible Project Performance Studies

• Formal performance model
• Define benchmarks
• Experiments

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Possible Project Security

• I may not want you to share my program component
• Performance degrades for me though it may improve
  for you
• You may not want to share my program component
• Do not trust my program
• You may not want to download my program component
  for replication
• A la downloading applets
• I may not want to migrate my program component to
  you
• Degrades my response time
• You may not want to migrate my program component
  to you
• Degrades performance of other apps

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Possible Project Collaborative Security

• Security motivated by collaboration
• Currently information owner sets policy
  unilaterally
• Do it collaboratively?

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Universal Interaction
Arbitrary
Networked Appliance
Arbitrary
Interactive Computer used as Remote Control
Late Binding Interactive Computer Learns about
Appliance at Use Time
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Just-in-time UI Generation (Omojokun)
HP680 Handheld
Proxima 6250 Projector
HP680 User-Interface Generator
Proxima 6250 Function Agent
Speech GUI
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Possible Project Other domains

• UI Generation for
• Research applications
• Nanomanipulator user interface
• Teaching
• no UI code in apps
• a la functional programming

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Possible Project Device Security

• Anyone in the same room can turn on the projector
• Children can view
• Selected TV channels
• at selected times
• not more than selected time
• Parents jointly own the TV and control access
• Babysitter is temporarily delegated right to
  control access

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Courses

• 243 (Distributed Systems, F03)
• 242 (Operating Systems, S04)
• 290 (Mobile Networking, F03)
• 290 (Collaborative Computing, S/F 04)

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Research Summary

• Possible Projects
• Dynamically Switching Shared Layer
• Policies for Automating Dynamic Transitions
• Securing Dynamic Architecture
• Integrated UI Generation
• Device Security
• Dynamic Device Composition
• Two RA positions

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Comp 114 Advanced programming

• Programming intro
• Advanced programming
• Correctly creating large programs
• Inheritance, Delegation, Design patterns,
  Event-based programming, Programmer-defined
  exceptions
• Collaborative spreadsheet
• UI Generation
• Data Structures

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Comp 114 Advanced programming

• 2 TA positions
• Late binding of RA positions
• Concepts unfamiliar to you
• Teaching experience

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Possible Project Device Composition
Ad-hoc
network
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Direct Bi Directional Connect
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Proxy-based Connect
PictureDestination
(ColorPictureConsumer)
camera
PictureDestination
PictureSource
(BWPictureConsumer)
Adapter
(ColorPictureProducer)
PictureSource
(BWPictureProducer)
printer