1. Wireless Reliable Messaging Protocol for Web Services (WS-WRM)
Sangmi Lee and Geoffrey Fox
Community Grid Laboratory,
Indiana University
11/28/2018

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
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3. WS Reliability in the Grid Middleware : NaradaBrokeringPC
Laptop
NaradaBrokering PC
Server
Laptop
PDA
Smartphone
NaradaBrokering PC
Server
Laptop
NaradaBrokering
11/28/2018

4. Current NaradaBrokering Features
Multiple transport support
In publish-subscribe
Paradigm with different
Protocols on each link
Transport protocols supported include TCP,  Parallel TCP streams, UDP, Multicast, SSL, HTTP and HTTPS.
Communications through authenticating proxies/firewalls & NATs. Network QoS based Routing
Allows Highest performance transport
Subscription Formats
Subscription can be Strings, Integers, XPath queries, Regular Expressions, SQL and tag=value pairs.
Reliable delivery
Robust and exactly-once delivery of messages in presence of failures
Ordered delivery
Producer Order and Total Order over a message type
Time Ordered delivery using Grid-wide NTP based absolute time
Recovery and Replay
Recovery from failures and disconnects.
Replay of events/messages at any time.
Security
Message-level WS-Security compatible security
Message Payload options
Compression and Decompression of payloads
Fragmentation a nd Coalescing of payloads
Messaging Related Compliance
Java Message Service (JMS) 1.0.2b compliant
Support for routing P2P JXTA interactions.
Grid Application Support
NaradaBrokering enhanced Grid-FTP. Bridge to the Globus TK3.
Web Service reliability
Prototype implementation of WS-ReliableMessaging
Web Service Notifications
Prototype implementation of WS-Notification
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5. Extending WS Reliable Messaging to Mobile environment
11/28/2018

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
11/28/2018

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
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8. 11/28/2018

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
11/28/2018

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
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11. ACK and NAK based protocol
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12. Message Structure
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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)
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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
11/28/2018

15. Interacting with the heterogeneous reliability schemes
NaradaBrokering performs assurance response to each end-devices using heterogeneous reliability schemes.
11/28/2018

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
11/28/2018

17. Future works Extending WS standards to mobile devices efficiently.
WS-Secure conversation
WS-Security
WS-Policy and WS-Notification
11/28/2018