2-jun-15 y. mazuryk, [email protected] tu/e informatica, system architecture and networking 1 yarema...

Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking

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Yarema Mazuryk

Service Oriented Architecturesin Heterogeneous Environments


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Context – Connected Home

Wireless LAN

Firewire (IEEE1394)

Bluetooth

Ethernet

Powerline

GG

GG


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Connected Home

Client Mobility Heterogeneous Network

Ad Hoc Network


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Key Aspects

Transparent control

Self organizing networksMinimal (zero) configuration

Embedded intelligence

Open protocols

Privacy

Advanced interaction


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Service Oriented Architecture - Place

Transport

MiddlewareService Oriented

Platform

ApplicationClient API

Client API

Service API

Service API

Transport

Service Oriented Platform

Client API

Client API

Service API

Service API

Service1Service1Client1Client1

Open protocolOpen protocol


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Service Oriented Architecture – Addressed Issues

Interoperability

Scalability

Agility

Reusability

Maintainability

Functional Incrementalism


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Service Oriented Architecture – Conceptual Model

ServiceService

Service Description

Service Description

Service Advertisement


Service User

Service User

Service Implementation

Service Implementation

provides

uses retrieves


Service Discovery

+address+address

+name+name

+address+address

Eventing, Control

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Service Description Example (UPnP)<actionList> <action>  <name>GetPlayMode</name> <argumentList> <argument> <name>Mode</name> <relatedStateVariable>PlayMode</relatedStateVariable> <direction>out</direction> <retval /> </argument> </argumentList> </action> </actionList>

<serviceStateTable> <stateVariable sendEvents="yes"> <name>PlayMode</name> <dataType>string</dataType> <allowedValueList> <allowedValue>PLAY</allowedValue> <allowedValue>PAUSE</allowedValue> <allowedValue>STOP</allowedValue> </allowedValueList> </serviceStateTable>


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SOA – “Publish-Find-Bind-Execute” Model

Provider

Consumer

NetworkNetwork

1 Publish

2Find

ContractContract3 Bind

4 Execute


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SOA vs Component Based Development

Networking environment

SOA COM

Central -

Communication model Messagebased

APIbased

Interfaces Coarse-grained

Fine-grained

InstantiationAs

neededSingle &active


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Addressing & Naming

Uniform addressing schemeIndependent from physical network addressing


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Discovery - GOALS

Locate the service provider

Retrieve provider’s access interfaceAcquire additional information


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Discovery - METHODS

Service Discovery

Service Discovery

Pre-configured

Pre-configured

Non- configured

Non- configured

Location aware

Location aware

MediatedMediated

ImmediateImmediate

Non-transparent

Non-transparent

TransparentTransparent ActiveActive PassivePassive


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Advertisement

Publish information about the service implementation

Service DescriptionProvider’s location


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Eventing & Control

Provider

Consumer

execute action A,subscribe to event B

Event B


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Existing Approaches

UPnP - IP-bound, has scalability problems

JXTA - Network independent, existing implementation has performance problems

Pastry - Focuses on efficient request routing

Web services - IP-bound

Can we base on one of these or do we need something new?


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What is JXTA?

*borrowed from www.jxta.org


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JXTA Vision

• promote communication (not isolation) among applications

• keep the core small and elegant

• support multiple platforms and languages, micro devices to servers

• address security from the beginning

• JXTA is an open source project


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JXTA Architecture


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JXTA – Set of XML-based Protocols

Peer Discovery Protocol—Enables peers to discover peer services on the network

Peer Resolver Protocol—Allows peers to send and process genericrequests

Rendezvous Protocol—Handles the details of propagating messages between peers

Peer Information Protocol—Provides peers with a way to obtain status information from other peers on the network

Pipe Binding Protocol—Provides a mechanism to bind a virtual communication channel to a peer endpoint

Endpoint Routing Protocol—Provides a set of messages used toenable message routing from a source peer to a destination peer


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JXTA – Key Concepts

PeerPeer

RdvPeer

RdvPeer

PeerPeer

PeerPeer

Peer Group

PipePeerPeer

RelayPeer

RelayPeer


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Case Study

Distributed Data Storage in Service-Oriented FashionDistributed Data Storage in Service-Oriented Fashion

JXTAJXTA UPnPUPnP ......

ANALYZE & COMPARE: Performance (discovery latency, memory

usage, ...)Scalability

Ad hoc networkingClient mobility

...

ANALYZE & COMPARE: Performance (discovery latency, memory

usage, ...)Scalability

Ad hoc networkingClient mobility

...

PROPOSE: Service Oriented FrameworkPROPOSE: Service Oriented Framework


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Future Work

Accommodate real-time requirements in SOAInvestigate security aspects

Interaction with the userInteraction between services

Group servicesMobile services

...


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2-jun-15 y. mazuryk, [email protected] tu/e informatica, system architecture and networking 1 yarema...

Documents

system architecture

service provider

network slide

control slide

single active slide

additional information

discovery goals

physical network