Eventdriven Coordination Rule of Web Services enabled Devices in Ubiquitous environments

1
Event-driven Coordination Rule of Web Services
enabled Devices in Ubiquitous environments

• Kangchan Lee
• ETRI(Electronics and Telecommunications Research
  Institute)
• chan_at_etri.re.kr

2
IT839 Strategy in Korea

• The IT839 Strategy
• the governments active efforts towards u-Korea
• http//eng.mic.go.kr/

Soft infraware
3
Ubiquitous Environments
Mobile
Automobile Service
Office
SIM
SD MMC
Infra Info
How to coordinate ?
IC Card
Personal Info
Home
Shop
E-Tower
Game
STB
DVC
TV
Map Info
Digital Contents
PC
Audio
DVD
Telephone
Outdoor
4
Basic Concept of Ubiquitous Web Services
Ubiquitous Web Services
Any Devices
Any Network
Any Service
5
Ubiquitous Web Services
Dynamic Discovery, Composition mechanism is
required
Discovery Services
find
publish
interaction
Service Requestor / Provider
Service Provider
6
WS-ECA

• WS-ECA Event, Condition, Action
• Rule based services composition mechanism
• Requirements of WS-ECA
• conditional response event filtering
• event forwarding/broadcasting/multicasting
• temporal reaction
• logical expression (conjunction, disjunction,
  negation, etc) of events and actions
• transitive rule

7
ECA Rule Description Language
Overview

• General structure of ECA Rule
• Examples of ECA Rules
• (conditional response)
• on e1 if c1 do a1
• on e1 if c2 do a2
• (transitive property) on e1 if c1 doon
  e2 if c2 do a2
• on e1 if c1 do a1 (?e1) cf. action a1
  generate internal event e1
• on e1e2 if c2 do a2
• (logical operation)
• Event on (e1e2) e3 if c1 do a1
• Condition on e1 if c1(c2c3) do a1
• Action on e1 if c1 do a1(a2a3)

on event if condition do action
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ECA Rule Description Language
Overview (contd)

• WS-ECA Rules
• Event primitive events(time, internal,
  external) complex events
• Condition variables in devices or events
• Action primitive actions(invoke, passEvent,
  createIntEvent, assign, delay)
• and complex actions

External Device
WS-ECA Rules
Variables
WS-ECA Rules
Device
Device variables
WS-Eventing Service invocation
Event variables
Services
ECA Rule
WS-ECA Rules
Events
WS-Eventing Service invocation
Event
time events
Services
External events
Condition
Internal events
External Device
Action
Actions
WS-Eventing
createIntEvent
WS-ECA Rules
passEvent
assign/delay
Services
invoke
Web service invocation
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ECA Rule Example
Scenario
if rice is not enough
getting
-
up time700AM
cook()
intEvent
(out_of_rice)
alarm(

20min before getting
-
up

)
if cooking is completed
extEvent
(cooking_completion)
alert()
after
intEvent
(out_of_rice)
timeDelay
(10min) before
invokeService
(
makeCoffee
())
morning cooking service example
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Conclusions

• ECA Rules in Ubiquitous Service Computing
• WS-ECA Rule description language
• Conflict detection and resolution in ECA Rules is
  required
• ECA Rule system components e.g. Rule Manager
• ECA Rule network protocol
• Future Works
• Resource management for multiple users
• Implementation of ECA Rule Systems