JXTA Platforms

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JXTA Platforms
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Learning Objectives

• Learn about the different platform
  implementations of the JXTA protocols
• Features provided by each implementation
• Status of each implementation
• Why you should use a specific platform
• Future enhancements

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JXTA Platform Implementations

• JXTA for J2SE
• JXTA for Pjava
• JXTA-C
• JXTA for J2ME
• JXTA for Python
• Other platforms

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JXTA for J2SE

• Reference implementation Java 2, Standard
  Edition (J2SE), v. 1.3.1
• Full implementation of JXTA protocols
• Standard (edge) peer, rendezvous, relay and proxy
  functionalities
• API frozen since Nov'01
• Maintained with help of Community
• Tutorials and Programmer's Guide
• MyJXTA and myJXTA2 demo applications (IM, group
  chat, file sharing)

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JXTA for J2SE
Upcoming Scalability Release

• Target scalability
• 1.5 Million peers
• 100 rendezvous
• 300,000 simultaneous peers
• 1,000 advertisements per peer
• 1.5 MB average content size
• 1 discovery/2 min per peer
• 2 hour average connection time
• 70 peers behind NATs

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JXTA for J2SE
Upcoming Scalability Release (continued)

• New optimized TCP/IP and HTTP transports
• Bi-directional back channels
• Resource management
• Separation of relay functionalities
• TCP/IP relay
• Rendezvous Network
• Standard peer index advertisements on rendezvous
• Queries only propagated between rendezvous
• Rendezvous peer view management
• Rendezvous loosely-coupled DHT walker

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JXTA for Pjava

• Personal Java (JDK v. 1.1.8)
• Full implementation of JXTA protocols
• Standard peer, rendezvous and relay support
• Backport from the J2SE platform
• Maintained with help of community

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JXTA for J2ME

• Proxy standard peer functionality only
• Interoperates with Project JXTA protocols
• Provides a simple and easy-to-use API
• Small footprint only about 10k
• MIDP-1.0 and iAppli compliant
• Network and carrier-independent

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JXTA-C

• Fully compliant implementation of Project JXTA
  protocols
• Standard peer functionality only
• Can discover both C and Java peers, and discover
  and create new peergroups that can be joined by
  both C and Java peers
• Can publish, establish pipe connections, send and
  receive messages between either C or Java peers
• Interoperates with J2SE relay and rendezvous
  peers
• Runs on Linux, Solaris, and Windows

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JXTA-C

• Portability Provided by Apache Portable Runtime
• Windows (Win 98/ME, Win NT/2000/XP)
• POSIX (Linux, Solaris OE, BSD, MacOS X)
• Focus on embedded applications
• HTTP Transport Only
• Secure pipes not yet implemented
• Full XML support via Expat

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Project JXTA-C Three layers

• Porting Layer
• Isolates OS/Runtime specific dependencies
• Facilitates porting to other environments
• Protocols Layer
• OS/Runtime independent
• Each protocol implemented as a separate component
  or service
• Application Layer
• C/C application level API
• Demo Shell interpreter (JXTA-C Shell)

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JXTA-C APIs

• Peer Group
• Membership
• Resolver
• Discovery
• Pipe
• Endpoint

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JXTA for Python

• Jython
• 100 Java implementation of Python interpreter
• Standard peer functionality only
• Scripting language for accessing Java J2SE JXTA
  classes
• Rapid prototyping environment
• Application modules can first be written in
  Python, run in interpretive mode and then
  compiled to Java .class files via jython compiler

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Other Platforms

• Ruby
• Objective C
• Perl
• .Net
• SmallTalk

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End JXTA Platforms