Mobile Web Services Mediation Framework - DeDiSys.org · 2007-11-29 · Lehrstuhl Informatik V...

Lehrstuhl Informatik V(Informationssysteme)

Prof. Dr. M. Jarke

Satish SriramaMatthias JarkeWolfgang Prinz

Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

1/18


Mobile Web Services Mediation Framework


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

2/18

Outline

Mobile HostMobile Host: QoS extensionsMobile Host in P2P networksMobile Web Services Mediation FrameworkRealization of MWSMFConclusions and future research directions


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile HostWireless developmentsMobile web services [LA, OMA]

Mobile web service provisioningImplementation details– Implemented in PersonalJava– Uses kSOAP2– SOAP over HTTP– Upgraded to J2ME

Performance analysis– Acceptable performance levels for service delivery– The WS processing time at the Mobile Host (< 10%) – Directly proportional to achievable transmission rates– High data transmission rates with 3G & 4G

WSWS

Service Requester

WSDL

SOAP

UDDI Registry

Mobile Host

Find

Refers

DescribePublish

WSWS

Service Requester

WSDL

SOAP

UDDI Registry

Mobile Host

Find

Refers

DescribePublish


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile Host QoS extensions –Security issues

Security breachesEnd-to-end securitySecurity Standards for web services– XML Encryption [W3C]

– XML Signature [W3C]

– WSSE (WS-Security Standard) [OASIS]

– SAML (Security Assertion Markup Language) [OASIS]

Adaptability of WSSE for mobile web servicesBouncy Castle Lightweight cryptographic API


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

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Mediation Framework

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Security resultsConfidentiality & Integrity can be provided for reasonable message sizes of 2kbExtra time to the WS invocation cycle is ~ 2 sec with ConfidentialityIntegrity latency is 2 secSigning on top of encryption ~3.5 secBest scenario (Highly secured and better performance)– AES-256 Symmetric key encryption– RSA 1024 bit key exchange– RSAwithSHA1 signature

Best scenario forces the need for a mediation framework


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile Host QoS extensions –Scalability issues

Scalability aspects– To achieve less data to transmit

Significant for Mobile HostTransmission time constitutes 90% of invocation cycle latency

– Improves battery lifeSize of MWS messageBmsg = Btp + Bmtp + Bsoap + Bapp

Minimal encoding is not always the best optionXML Compression– XMill [Liefke and Suciu, 1999]

– Fast Infoset [Sandoz et al., 2004]

– Efficient XML [AgileDelta]


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Scalability analysis

BinXML [Ericsson and Levenshteyn, 2003]

– XML tags replaced by Unique byte value– 6 reserved bytes (0x00-0x03, 0xFE, 0xFF)– Effective for SOAP messages

Analysis– BinXML enabled MH– Message size 5 kb– ~ 15% gain (1.3 sec)

MWS compression gain:Tmwscg = δTreqt + δTrest − Treqenc − Treqdec − Tresenc − Tresdec

Comparision of mobile web service invocation times with and without BinXML compression

9297

6910

86067964

1205

240

6519

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

Total time atclient

Serverprocessing time

Clientprocessing time

Transmissiontime

Tim

e in

Mill

isec

onds

WithoutBinxmlWithBinxml


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile Host in JXTA network

Technical advantages to Mobile Host– Eliminating the need for Public IP– Better identification/access mechanisms (Peer ID)– Better service discovery

BTS1

BTS2 BTS3JXTA Super peer (Relay & Rendezvous)

JXTA Relay peer

JXTA Rendezvous peer

JXME edge peer

JXME edge peer

JXME edge peer


JXTA Network

WSWSWSWS

WSWSWSWS

JXME edge peer

WSWSWSWS

Mobile Operator Network

Virtual P2P Network

BTS1

BTS2 BTS3JXTA Super peer (Relay & Rendezvous)

JXTA Relay peerJXTA Relay peer



JXME edge peer

JXME edge peer

JXME edge peerJXME edge peer


JXTA Network



JXTA Network

WSWSWSWS

WSWSWSWS

JXME edge peer

WSWSWSWS

Mobile Operator Network

Virtual P2P Network


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile web service discovery issuesWeb service discoveryHuge number of services are possible with Mobile HostsCentralized UDDI not the best solution– Problems with bottlenecks

Mobile nodes are dynamic– Binding information changes regularly– Services are to be published again and again

Dynamic service discovery mechanisms– Announce listen model (e.g. Jini)– Distributed P2P WS registry (VISR) [Dustdar and Treiber, 2006]

– Konark [Lee et al., 2003]

– UPnP


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile web services discoveryPublishing mobile web services in JXTA / JXME– JXTA Modules– Life time of advertisements

MSAs advertise mobile web servicesDiscovery of MSAs with name & description– Works, but not very precise

Module ImplementationAdvertise a platform specific implementation

Module SpecificationAdvertise how to access a Service (API, messages)

Module class Advertise the existence of a service




UDDI Registry

Service Interface

Service Implementation

WSDL







UDDI Registry

Service Interface


Service Interface



WSDL

<jxta:MSA><MSID> . . . </MSID>. . . <Parm>

<WSDL>. . .

<WSDL></Parm>. . . </jxta:MSA>


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

11/18

Advanced mobile web service discovery

Categorization using MCAMCAs simulate Category bags & tModels in UDDIPeer Groups simulate business groupsPost-filtering of mobile web services– Search can also extend to WSDL information– Search should be based on weight of keywords– Apache Lucene tool

Based on indexing– Advanced Matching of Services (AMS)

Context-aware service discovery [WSTalk]

– To achieve very precise results– Ontology based context engine


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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Mobile Web Services Mediation Framework

How to integrate mobile web services and P2P domains taking care of QoS?

BTSJXTA Super peer

JXTA Relay peer

JXTA Rende-zvous peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

Virtual P2P Network

BTSJXTA Super peer

JXTA Relay peer








Virtual P2P Network

MWSMF UDDI

WS Accessible to IP network

QoS Provisioning

BTSJXTA Super peer

JXTA Relay peer


JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

Virtual P2P Network

BTSJXTA Super peer

JXTA Relay peer








Virtual P2P Network

MWSMF UDDIUDDI


QoS Provisioning

BTS2 BTS3BTS2 BTS3

InternetInternetWS Client

JXTA Network

JXTA Rende-zvous peerJXTA Rende-zvous peer

BTSJXTA Super peer

JXTA Relay peer


JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

Virtual P2P Network

BTSJXTA Super peer

JXTA Relay peer








Virtual P2P Network

MWSMF UDDI


QoS Provisioning

BTSJXTA Super peer

JXTA Relay peer


JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

JXME edge peer

Virtual P2P Network

BTSJXTA Super peer

JXTA Relay peer








Virtual P2P Network

MWSMF UDDIUDDI


QoS Provisioning

BTS2 BTS3BTS2 BTS3

InternetInternetInternetInternetWS Client

JXTA Network

JXTA Rende-zvous peerJXTA Rende-zvous peerJXTA

Network

JXTA Rende-zvous peerJXTA Rende-zvous peer


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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MWSMF realization

Why Enterprise service Bus (ESB)?– Any SOA should be sufficient for the purpose– Web services are best means of realizing SOA– Latest developments in web services domain

Enterprise service Bus (ESB)– “Enterprise Service Bus provides a set of infrastructure

capabilities, implemented by middleware technology, that enable the integration of services in an SOA” [Gartner, Inc.]

Java Business Integration (JBI)ServiceMix


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

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MWSMF - Components

InternetInternetWS Client InternetInternetInternetInternetWS Client

MWSMF

HttpReceiver

Broker

XSLTTransformer

ContentBasedRouter

HttpInvoker

Normalized

Message

Router

QoSVerifier

SAAJBinding

P2PMapper ContextEngine

BinaryTransformer

Mobile HostWSWS

Mobile HostWSWS

InternetInternetWS Client InternetInternetInternetInternetWS Client

MWSMF

HttpReceiver

Broker

XSLTTransformer

ContentBasedRouter

HttpInvoker

Normalized

Message

Router

QoSVerifier

SAAJBinding

P2PMapper ContextEngine

BinaryTransformer

Mobile HostWSWS

Mobile HostWSWS


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

15/18

Message flows in MWSMF

Supplementary features of MWSMF– Hosts a UDDI registry– Supports automatic startup of

Mobile HostsPushRegistry feature of WMA

HttpReceiver

Broker

HttpInvoker

NMR

BinaryTransformer

Mobile HostWSWS

Mobile HostWSWS

Internet

MWSMF

1

2

34

5

6 7

8

910

11

12

JBI Container

HttpReceiver

Broker

HttpInvoker

NMR

BinaryTransformer

Mobile HostWSWS

Mobile HostWSWS

InternetInternet

MWSMF

1

2

34

5

6 7

8

910

11

12

JBI ContainerMobile web service message optimization scenario


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

16/18

Performance evaluation of MWSMFApacheBench load generatorEstablished on a laptopSuccessful in handling 110 concurrent requestsMean value of handling a client ~ 130 msEvaluation proved that MWSMF can handle large number of concurrent clients

Time-Diagram

0.00

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

35,000.00

10 30 50 70 90 110

130

160

200

240

280

No of concurrent requests

Tim

e to

han

dle

sing

le c

lient

(ms)

Time

TPS-Diagram

0

2

4

6

8

10

12

14

16

10 30 50 70 90 110

130

160

200

240

280

No of concurrent requests

Tran

sact

ions

per

sec

ond

(TP

S)

TPS


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

17/18

ConclusionsQoS aspects for MWS are discussedAlternatives for mobile web services discovery are identifiedArchitecture, features and realization details of MWSMF are identifiedDiscussed mobile web service message optimizationscenarioEvaluation proved MWSMF deployment scenario is feasibleRemaining components of the MWSMF are to be realized– P2P Mapper– ContextEngine

Further scenarios can be envisioned


Prof. Dr. M. Jarke


Mobile Web Services

Mediation Framework

Mobile Web Services

Mediation Framework

18/18

Thank you

Mobile Web Services Mediation Framework - DeDiSys.org · 2007-11-29 · Lehrstuhl Informatik V...

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