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Getting Started with JXTA for J2ME

Getting Started with JXTA for J2ME. Advisor : Dr. Ching-Long Yeh Report : DI.2, 洪泰昌 (89506005) Course: XML 文件管理. Abstract. Ad hoc networks : a self-configuring network of mobile Self-organization ability: simplify management, robustness, flexible

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Getting Started with JXTA for J2ME

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  1. Getting Started with JXTA for J2ME Advisor : Dr. Ching-Long Yeh Report : DI.2, 洪泰昌 (89506005) Course: XML文件管理

  2. Abstract • Ad hoc networks : a self-configuring network of mobile • Self-organization ability: simplifymanagement, robustness, flexible • Well suited to the vicissitudes of wireless • P2P model enables “mobile devices” to assemble quickly • JXTA ("juxtapose") , a set of protocols for P2P networking • In this report: • How the JXTA protocols are extended to MIDP • How to install and run JXTA demonstration programs for MIDP

  3. Abstract • JXTA demonstration programs for MIDP • Chat MIDlet JXME Proxy (Relay) DEMO

  4. Agenda • Abstract • JXTA • Java ME (J2ME) • JXME • Summary • Appendix • Prerequisite for implementation • Implementation of J2ME Chat MIDlet • Implementation of JXME Proxy • References and Resources

  5. JXTA • JXTA defines a set of open protocols for peer-to-peer networks • JXTA (v2.0) Protocol Specification • XML-based protocols • Functionalities • peer discovery • endpoint routing • connection binding • basic query/response message exchange • network propagation through rendezvous peers

  6. Java ME • Java ME: • Java Platform, Micro Edition (Java ME) provides a environment for applications running on mobile and other embedded devices • mobile phones, personal digital assistants (PDAs), TV set-top boxes, and printers • MIDP: Mobile Information Device Profile (v2.0) • Implementation Specification • Subset of Java SE (JDK)  limited capacity

  7. Java ME • MIDP: • javax.microedition.rms • Record Management System, persistence • javax.microedition.midlet • Environment, lifecycle • javax.microedition.io • Network • javax.microedition.lcdui • UI（User Interface） • Java.lang.* java.util.* • MIDlet : application • javax.microedition.midlet.MIDlet

  8. Java ME • MIDlet: • Managed by Application Management software (AMS) : Paused，Active，destroyed

  9. JXME • JXME : • JXTA Java Micro Edition (MIDP/CLDC/CDC) Project • The goal of the JXME project is to bring JXTA functionality to MIDP devices • A framework • Why JXME ?  The constraints of Mobile Device • XML parser  memory limits of MIDP devices? • The state of the network  needs to be cached  memory limits of MIDP devices? • MIDP mandates support for HTTP, but socket and datagram connections are optional • JXTA protocols exceed the minimum requirements of MIDP  JXTA relay

  10. JXME Architecture

  11. Rendezvous/relays

  12. Coordination between J2ME Edge Devices and JXTA Relays • J2ME peer send HTTP request messages to a JXTA relay • JXTA relay parse each name-value pair in the HTTP request XML messages (JXTA format) relay the messages over the JXTA network • JXTA relay receives a message from the JXTA networkparse the XML format of the incoming message author a corresponding HTTP response • Wait for the J2ME peer to send an HTTP poll request send the HTTP response back to the J2ME peer 1. 2. Response 3. 4.

  13. JXME API • Element: elements of JXTA Message • Message: JXTA Message, access methods • PeerNetwork: • createInstance(): create PeerNetwork instance • connect(): connect to relay • create(): peer, group, pipe • search(): peer, group, pipe • poll() poll the information from relay server • listen() and close(): open and close pipe • send(): send the message to the pipe

  14. JXME Code Example Create peer • Create pipe Connect to proxy create pipe

  15. JXME Code Example • Find the pipe which we created

  16. JXME Code Example • Send message through the pipe which we just find

  17. JXME Code Example • Receive message

  18. Summary • JXTA furnishes an XML-based, platform-independent set of protocols that enable P2P networking • JXME project brings JXTA functionality into the MIDP world • Vision: Ad hoc network Every mobile device as “Server”

  19. Summary • Not popular ? Why ? • Cost: GPRS, 3G …? • Mobile device: Power consumption, UI ? • In the future • WiMax  cost down • Wireless  Leased-line network  connected anytime • Google Android platform ?  XMPP protocol • Trends: P2P network + XML based protocol

  20. Appendix

  21. Prerequisite for implementation • Required libraries from http://download.java.net/jxta/ • jxse-lib-2.5.zip • JXTA core • JMEX Proxy libraries • jxme-2.1.3-bin.zip • JXME framework • Chat MIDlet code and libraries • Tools: • NetBeans (6.0) + Mobility pack • http://www.netbeans.org/

  22. Implementation of J2ME Chat MIDlet 1. New project Mobile  mobile project from existing MIDP source

  23. Implementation of J2ME Chat MIDlet 2. Specify the source and JAD file

  24. Implementation of J2ME Chat MIDlet 3. Name and Location  name  chat

  25. Implementation of J2ME Chat MIDlet 4. Default Platform Selection : use default

  26. Implementation of J2ME Chat MIDlet 5. Add library : chat porject  right click  properties  add Jar/Zip  jxta-cldc.jar

  27. Implementation of J2ME Chat MIDlet 6. Run : chat project  right click  run project

  28. Implementation of J2ME Chat MIDlet Related files and locations • Chat source code • \jxme-2.1.3-bin\midp\demo\chat • JAD: • \jxme-2.1.3-bin\midp\demo\chat\bin\chat.jad • Library: • \jxme-2.1.3-bin\midp\demo\chat\lib\jxta-cldc.jar

  29. Implementation of JXME Proxy 1. New project  General project  Java Application

  30. Implementation of JXME Proxy 2. name proxy  finish

  31. Implementation of JXME Proxy 3. New Java class  place the code which we provide

  32. Implementation of JXME Proxy • Code: package tommy; import java.io.File; import net.jxta.platform.NetworkManager; public class StartJXME_Proxy { private NetworkManager manager; public StartJXME_Proxy() { } private void startProxy() { try { manager = new NetworkManager(NetworkManager.ConfigMode.PROXY, "ProxyeServer", new File(new File(".cache"), "ProxyeServer").toURI()); manager.startNetwork(); } catch (Exception e) { e.printStackTrace(); System.exit(-1); } } public static void main(String[] args){ StartJXME_Proxy startJXME_proxy = new StartJXME_Proxy(); startJXME_proxy.startProxy(); } }

  33. Implementation of JXME Proxy 4. Add libraries Libraries  Add Jar/folder\jxse-lib-2.5\*.jar

  34. Implementation of JXME Proxy 5. Run  project  right click  run project

  35. References and Resources • Getting Started with JXTA for J2ME,http://developers.sun.com/mobility/midp/articles/jxme/index.html • JXTA,https://jxta.dev.java.net/ • JXTA v2.0 Protocol Specification,https://jxta-spec.dev.java.net/ • JXTA Community Forum,http://forums.java.net/jive/forum.jspa?forumID=50&start=0 • JXTA JXSE Programmers Guide, https://jxta-guide.dev.java.net/ • J2ME tutorials,http://developers.sun.com/mobility/learning/tutorial/ • Sun Java Wireless Toolkit ,http://java.sun.com/products/sjwtoolkit/download.html • NetBeans,http://www.netbeans.org/

  36. References and Resources • Code in Netbeans Project: • 網路硬碟二：share name  XML-JXME • Maybe you need to correct the location of libraries • Public JXME proxy: • http://rdv.jxtahosts.net/cgi-bin/relays.cgi?2 • http://192.18.37.36:9700 • http://192.18.37.37:9700 • http://192.18.37.38:9700 • http://192.18.37.39:9700

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