SwanLink

1
SwanLink

• Peer to Peer System
• for Educational Purposes

2
Research Goal

• Internet-oriented education
• Data sharing
• Consistency maintenance

3
Problem Statement

• Message based network communication
• Sessions group support
• Maintaining consistent state
• Managing joining/leaving
• Remote data access
• Video-conferencing support

4
Three-Tier Architecture

• User interface tier
• Application kernel
• Network tier

5
User Interface Tier

• Selecting IDE
• Microsoft Visual Studio 6.0
• Microsoft Visual Studio 7.0 .Net
• Borland C Builder
• Platform specific

6
Application Kernel

• Managing the client state
• Business logic
• Creating the events
• Handling the events
• ANSI C implementation
• Platform independent

7
Network Tier

• Reliable message passing
• Low latency
• Easy to change configuration
• Managing huge number of contributors

8
Network TierExisting Solutions

• Point-To-Point Networking Protocols
• Client-Server Middleware
• Multicast Networking Protocols
• Peer-to-peer Middleware

9
Point-to-Point Networking Protocols

• Allow direct two-way communication between two
  computer processes
• Using point-to-point connections directly does
  not scale easily as the number of participating
  processes grows

10
Client-Server Middleware

• Resources are not well-used in client-server
  solutions
• Client resources tend toward underutilization
• The resources of the servers are in excessive
  demand

11
Multicast Networking Protocols

• Require special router hardware and/or software
  to achieve data sharing
• Performance bottleneck
• Single point of failure for the session
• Serialized messaging limits speed

12
Peer-to-Peer Middleware

• Provide an easy-to-use abstraction
• Hidden from the programmer is how the actual
  communication takes place

13
Benefits of P2P Technology

• Eliminate centralized servers and capital
  intensive server farms
• Eliminate centralized warehouses of information
• Eliminate centralized arbitrators (hardware,
  software, or human) normally tasked with deciding
  which computers talk to which other computers

14
Choosing P2P Implementation

• JXTA
• Microsoft Net Meeting
• SWAN

15
SWAN Small-world Wide Area Networks

• Swan solution for ad hoc networks is near-optimal
• Retains high reliability
• Logarithmic latency

16
Benefits of SWAN Technology

• Economical
• Simple to use
• Easy to implement
• Real-time responsive
• Reliable
• Secure

17
Joining Group
18
Group Diameter
?log2N? ?log2lnN log212? 1 ? d d ? ? log2N
log2lnN? 1
19
Swan Group
20
Message Passing
21
SwanLink Application
22
SwanLink
Peer to Peer System for Educational Purposes
Authors Prof. Veljko Milutinovic,
vm_at_etf.bg.ac.yu Jovan Popovic,
josars_at_galeb.etf.bg.ac.yu Nenad Korolija,
nenadko_at_net.yu Predrag Minic, mipedja_at_galeb.etf.b
g.ac.yu Andrija Bonjakovic, andrija_at_etf.bg.ac.yu