1. DSML-Aided Development for Mobile P2P Systems
Tihamér Levendovszky
Tamás Mészáros
Péter Ekler
Márk Asztalos
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

2. DSML-Aided Development for Mobile P2P Systems
Outline
Mobile Peer-to-Peer (BitTorrent)
Message model
Protocol model
BitTorrent messages
BitTorrent protocol (and event handling)
Modelling the UI
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

3. DSML-Aided Development for Mobile P2P Systems
BitTorrent
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

4. DSML-Aided Development for Mobile P2P Systems
Mobile Peer-to-Peer
Increasing capabilities of simple mobile phones
Find, access and play multimedia content with the same device
Bringing peer-to-peer technology to the player device
MobTorrent 1.1
31th of April
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

5. DSML-Aided Development for Mobile P2P Systems
Modelling BitTorrent
Easier to update the model
Easier to fix bugs
The protocol can be used for other content sharing solutions (more than a simple BitTorrent client)
Easy to build applications on top of the protocol
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

6. DSML-Aided Development for Mobile P2P Systems
Message model
BitTorrent messages have common structures
ConstantField: this part of the message is constant
SeparateField: length is not fixed but it is separated by characters
FixedLengthField: length is fixed
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

7. DSML-Aided Development for Mobile P2P Systems
Protocol model
Handle callbacks
Handle states
Handle errors
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

8. DSML-Aided Development for Mobile P2P Systems
BitTorrent messages
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

9. DSML-Aided Development for Mobile P2P Systems
BitTorrent protocol
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

10. DSML-Aided Development for Mobile P2P Systems
Modeling the UI
Generating UI is extremely important on mobile devices
Common UI elements
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

11. DSML-Aided Development for Mobile P2P Systems
Evaluation
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

12. DSML-Aided Development for Mobile P2P Systems
Summary
Content sharing is relevant on mobile phones
BitTorrent is one of the most efficient protocols
Create general model for BitTorrent
Easy implementation of applications on top of the technology
OOPSLA09
DSML-Aided Development for Mobile P2P Systems

13. DSML-Aided Development for Mobile P2P Systems
Thank You!
OOPSLA09
DSML-Aided Development for Mobile P2P Systems