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Wireless Reliable Messaging Protocol for Web Services (WS-WRM)

Explore the extension of reliable messaging to mobile devices, optimizing data transfer, storage usage, and delivery assurance in the grid middleware environment. The protocol supports cooperation with other WS reliability specifications and binding with additional WS features.

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Wireless Reliable Messaging Protocol for Web Services (WS-WRM)

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  1. Wireless Reliable Messaging Protocol for Web Services (WS-WRM) Sangmi Lee and Geoffrey Fox Community Grid Laboratory, Indiana University leesangm@indiana.edu

  2. Background • Community Grid Lab • Grid systems and Web services • Explosive growth of mobile telecommunication networks • Carousel project : adapting mobile devices into the collaborative environment. • Mobile devices in Web services • Participates as a Web service or user leesangm@indiana.edu

  3. PC Laptop PC NaradaBrokering Laptop PC Laptop Server Server PC PC NaradaBrokering NaradaBrokering Laptop PDA Smartphone PC PC WS Reliability in the Grid Middleware : NaradaBrokering leesangm@indiana.edu

  4. Current NaradaBrokering Features leesangm@indiana.edu

  5. Extending WS Reliable Messaging to Mobile environment leesangm@indiana.edu

  6. Web service Reliable Messaging schemes • WS-Reliability/WS-ReliableMessaging • Message Delivery Assurance • At-Least-Once • At-Most-Once • Exactly-Once • Guaranteed Message Ordering • Acknowledge/Negative acknowledge • Failure recovery: storage service leesangm@indiana.edu

  7. Reality of Mobile Computing • Limited network environment • Network Protocol – depends on the service provider, device, OS • Bandwidth – lower bandwidth, overhead with service gateway • Storage – sharing memory for storage and running program • Emerging new devices and services leesangm@indiana.edu

  8. leesangm@indiana.edu

  9. Requirements for design WS Reliable Messaging protocol for Mobile Environment • Satisfies reliable messaging delivery assurances • Optimizes the number of data transfer • Optimizes the usage of the local data storage • Provides stronger delivery assurance scheme for higher failure rate • Enables cooperate with other WS reliability specifications • Supports the binding with other WS features leesangm@indiana.edu

  10. WS-Wireless Reliable Messaging (WS-WRM) • Extending Reliable messaging scheme to mobile end-nodes • NAK/ACK based optimization • Passive behavior for the reliability policy in the Mobile node • Save time to develop for emerging mobile devices • more controllable from powerful machine ( PC, Middleware, proxy, etc) • Minimize usage of storage in mobile devices leesangm@indiana.edu

  11. ACK and NAK based protocol leesangm@indiana.edu

  12. Message Structure leesangm@indiana.edu

  13. Request • <NAKTrackingRequired> : the destination starts to keep track of the order of messageIDs in delivered message(s). From current MessageID or given range specified in <MessageIDRange> • <ACKRequired> : the destination starts to send acknowledgement for received message(s). • <DuplicationElilinationRequired> • <MessageOrderingRequired> • <MessageIntegrityRequested> : advanced delivery assurance type (destination generates the message digest with SOAP message body with specified algorithm, and verifies the integrity) leesangm@indiana.edu

  14. Cost of the Message Integrity Request in Mobile devices Generating message digest Comparison of message digests PalmOne’s Treo300 J2ME CLDC1.0 PalmOS 3.5 33MHz/16MB memory leesangm@indiana.edu

  15. Interacting with the heterogeneous reliability schemes • NaradaBrokering performs assurance response to each end-devices using heterogeneous reliability schemes. leesangm@indiana.edu

  16. Conclusion • WS-WRM extends the reliable messaging to the mobile end-nodes • Adapting mobile end-node as a participants of WS architecture • ACK/NAK based optimized reliable data protocol • Minimize the intelligent processing in the mobile end-nodes : provide more adaptability, and light implementation • Supports cooperating with other reliable messaging schemes leesangm@indiana.edu

  17. Future works • Extending WS standards to mobile devices efficiently. • WS-Secure conversation • WS-Security • WS-Policy and WS-Notification www.naradabrokering.org leesangm@indiana.edu

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