JXTA Juxtapose

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JXTA (Juxtapose)

• Presented By Anil Gürsel
• Mehmet Çatalgöl

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Client-Server Architecture

• Clients
• Server
• Ex Mail Server, Web Server, FTP Server
• Centralized Architecture

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Peer-to-Peer Architecture

• No specialized peers
• Clients may be also servers
• Decentralized Architecture

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Advantages of P2P Model

• Unlike C/S, the performance increases when the
  number of clients increases.
• The system stops working only if there are no
  peers online at the system

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Disadvantages of P2P Model

• Difficult to control and manage the networking
• Since the clients enter a network at will, there
  is an issue of performance problem
• Not applicable to all kinds of devices. ( no
  ubiquity)

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JXTA Structure

• Special form of P2P architecture.
• Produces a virtual network on top of the physical
  network while processing.
• The number of these virtual networks may vary in
  the system.

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JXTA Structure (2)

• The structure is free from the programming
  language.
• Free from the OS.
• Free from the method of service.
• Free from the network protocol.
• Free from device type.

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Main Objectives

• Interoperability
• Platfrom Independence
• Ubiquity

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Peers

• Edge Peers
• Rendezvous Peers
• Relay Peers

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Peer Groups

• Virtualizes the topology of JXTA Network
• The NetPeer Group
• User Groups

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Pipes

• Virtualizes peer connections
• Abstraction of channels
• Protocol independent transfers

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Advertisements

• JXTA resources are represented as advertisements
• To exchange data, peers
• store
• publish
• exchange advertisements

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Discovery

• Static Discovery
• Rendezvous Peers
• Dynamic Discovery
• Relay Peers

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JXTA Protocols

• Absence of protocols in traditional P2P model was
  a problem.
• JXTA posseses them in order to standardize P2P
  model.

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JXTA Protocols (2)

• JXTA protocols are classified into two
  subclasses.
• Core Specification Protocols
• Standard Service Protocol

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JXTA Protocols (3)
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Core Specification Protocols

• Define the functional requirements of JXTA
• Endpoint Routing Protocal (ERP)
• Peer Resolver Protocol (PRP)

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Standard Service Protocols

• Optional but strongly recommended for an
  effective interoperability.
• Rendezvous Protocol
• Peer Discovery Protocol
• Peer Information Protocol
• Pipe Binding Protocol

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Security

• Libraries about encrytion
• TLS along pipes
• Peer Groups
• Developers can plug new security choices

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Why Java?

• Ease of development
• Portability
• Rich set of class libraries

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References

• http//www.jxta.org
• http//www.javaworld.com
• http//en.wikipedia.org
• http//www.onjava.com
• Project JXTA Overview, Steve Krasinsky
• Project JXTA 2.0 Super-Peer Virtual
  Network,Bernard Traversat, Ahkil Arora,Mohamed
  Abdelaziz, Mike Duigou, Carl Haywood,
  Jean-Christophe Hugly, Eric Pouyoul, Bill Yeager
• Project JXTA A Technology Overview, Li Gong
• JXTATM Technology Creating Connected Communities