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

environments

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

environments

Kangchan LeeETRI(Electronics and Telecommunications Research Institute)

chan@etri.re.kr

2

IT839 Strategy in KoreaIT839 Strategy in Korea

• The IT839 Strategy – the government’s active efforts towards u-Korea

– http://eng.mic.go.kr/

9 New Growth Engine9 New Growth Engine3 Infrastructure3 Infrastructure8 Services8 Services

Next-generation mobile CommunicationsNext-generation mobile Communications

Digital TV BroadcastingDigital TV Broadcasting

Home NetworkHome Network

Next generation PCNext generation PC

IT SoCIT SoC

S/W solution & Digital ContentsS/W solution & Digital Contents

Embedded SWEmbedded SW

TelemeticsTelemetics

Intelligent Service robotIntelligent Service robot

Borad ConvergenceBorad ConvergenceNetworkNetwork

u-Sensor Networku-Sensor Network(USN)(USN)

IPv6IPv6

WiBro WiBro

DMBDMB

Telemetics/LBSTelemetics/LBS

Home NetworkHome Network

RFIDRFID

W-CDMAW-CDMA

Terrestrial DTVTerrestrial DTV

Internet TelephonyInternet Telephony

Soft infrawareSoft infraware

3

Ubiquitous EnvironmentsUbiquitous Environments

SDMMC

Ｅ -TowerGame

Telephone

PC

DVD

Audio

TV

STBDVC

Map Info

IC Card

SDMMC

SDMMC

SIM

♪DigitalContents

InfraInfo

Personal Info

Automobile Service

Mobile

Office

Home

Outdoor

Shop

How to coordinate ?How to coordinate ?

4

Basic Concept of Ubiquitous Web ServicesBasic Concept of Ubiquitous Web Services

Any DevicesAny Devices

Any NetworkAny Network

Any ServiceAny Service

Ub

iqu

itou

s Web

S

ervices

5

Ubiquitous Web ServicesUbiquitous Web Services

ServiceRequestor /

Provider

ServiceProvider

interaction

DiscoveryServices

publishfind

Dynamic Discovery, Composition mechanism is required

6

WS-ECAWS-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

• 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 do{on e2 if c2 do a2}

• on e1 if c1 do a1 (e1’) cf. action a1 generate internal event e1’

• on e1’^e2 if c2 do a2

– (logical operation)• Event on (e1^e2) | e3 if c1 do a1

• Condition on e1 if c1|(c2^~c3) do a1

• Action on e1 if c1 do a1|(a2^a3)

OverviewECA Rule Description LanguageECA Rule Description Language

on event if condition do action

8

• 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

Overview (cont’d)

External Device

WS-ECA Rules

Actions

invokeassign/delaypassEvent

createIntEvent

Events

time events

Internal eventsExternal events

Variables

Event variablesDevice variables

ECA Rule

Event

Condition

Action

Device

WS-ECA Rules

Services

External Device

Services

WS-ECA Rules

Services

WS-ECA RulesWS-Eventing

Web service invocation

WS-Eventing& Service invocation

WS-Eventing

& Service invocation

ECA Rule Description Language

ECA Rule Description Language

9

ScenarioECA Rule ExampleECA Rule Example

morning cooking service example

alarm(‘ 20min before getting-up’)

getting- up time=7:00AM

cook()intEvent (out_of_rice)

if rice is not enough

alert()

after intEvent (out_of_rice)

if cooking is completed

extEvent (cooking_completion)

timeDelay (10min) beforeinvokeService( makeCoffee())

10

ConclusionsConclusions

• 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