Service Oriented Computing Research

1
Service Oriented Computing Research
2
Web Services Hide Network and System
Heterogeneity

• Conventional Distributed Systems
• Conventional middleware and Enterprise
  Application Integration (EAI) technologies have
  limited success.
• Lacks interoperability.

RMI
B
Inter-Operability Protocols
C
A
CORBA
COM

• Web Services
• Uniform interface (WSDL Web Service Description
  Language)
• Common communication platform (SOAP Simple
  Object Access Protocol)
• Hide the network and system heterogeneity.

3
Web Service Application Development Current
Practice and Research Issues

• Web Service Based Workflow Applications
• Web services are distributed across the network.

IPS

• Web service composition.

Composite Web Process

• Issues
• Detailed level Programming Confined only to
  expert users.
• Centralized Coordination Web services are not
  live participants.

Developing Purchase Order Workflow Current
Practice
4
Our Vision and Contributions
BondFlow System

• Core set of primitives for web service
  coordination - Web Coordination Bonds

WSCMM
WS

• Extend the Web service infrastructure beyond the
  basic service architecture (invoke and respond)
  Web Coordination Management Middleware (WSCMM)

Bonding Artifacts

• Workflow configuration and execution platform

5
Broader View
Negotiation Bonds
Subscription Bond

• Limitations of Web service composition
  (orchestration) and coordination (choreography)
• For experts only
• Web Services not live participants
• Centralized

Coordination among self-coordinating Web services
using Web bonds
6
Mobile ComputingSystem on Devices (SyD)
middleware project
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Proliferation of Handheld Computing

• The most profound technologies are those that
  disappear. They weave themselves into the fabric
  of everyday life until they are indistinguishable
  from it

• Proliferation of handheld computing is attributed
  to three key technological advancements
• Technological advancements in Handheld device
  hardware
• Advancements in wireless communication
• Application domains

8
Execution Environment for Mobile Adhoc
Applications using SyD Middleware
Mobile Support Station
B
Calendar
Deviceware
Process Requests
3. p2p communication
Listener
Calendar
A
Calendar
Deviceware
Process Requests
C
Listener
Deviceware
Process Requests
Groupware
Listener
Listener
Process Requests
Directory
9
Performance Evaluation

• System Configuration

• HPs iPAQ models 3600 and 3700 with 32 and 64
  MB storage running Windows CE/Pocket PC OS
  interconnected through IEEE 802.11 adaptors cards
  and a 11 MB/s Wireless LAN.
• Jeode EVM personal java 1.2 compatible,
  implementing Java Virtual Machine.
• Footprint of the SyDMiddleware system is 112KB.
• Average service time for requests in
  milliseconds is about 300 ms for the personal
  calendar application.

iPAQ models 3600 and 3700
10
QA