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Service-Oriented Architectures: Potential and Challenges . Motivation and Example Scenarios Basic Technology Current Trends and Research Challenges. Prof. Dr. Alexander Schill Technische Universität Dresden Chair of Computer Networks. Motivation and Example Scenarios.

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Service oriented architectures potential and challenges l.jpg

Service-Oriented Architectures: Potential and Challenges

  • Motivation and Example Scenarios

  • Basic Technology

  • Current Trends and Research Challenges

Prof. Dr. Alexander Schill

Technische Universität Dresden

Chair of Computer Networks


Motivation and example scenarios l.jpg

Motivation and Example Scenarios


Service oriented architectures soa structure l.jpg

Service Oriented Architectures (SOA): Structure

2. Find via Registry

Requestor

Service

broker

(Registry)

1. Publish

Interface

3. Bind

Interaction

Service provider

“Distributed, discovery based model to expose and manage a collection of software assets as services”

Prof. Dr. Alexander Schill


Soa major advantages l.jpg

SOA: Major Advantages

  • Flexibility

    • Dynamic service selection

    • Variable service orchestration

    • Simple reconfiguration

  • Integration

    • Universal interfaces based on XML

    • Simple data integration and mapping

    • Coexistence with middleware and application servers

  • Traditional benefits of distributed systems

    • Decentralization

    • Replication and fault tolerance

    • Parallel execution, scalability etc.

Prof. Dr. Alexander Schill


Soa example closed service coupling l.jpg

SOA Example: Closed Service Coupling

Client

(for instance

Point of Sale)

Server

(for instance

account

server)

Server

(for instance

database)

Client

(for instance

Automatic

Teller Machine)

Data management

Application logic

Client

(for instance

Home

Access)

User interface,

pre-processing

(thin vs.fat client)

Prof. Dr. Alexander Schill


Soa example complex business services l.jpg

SOA Example: Complex Business Services

Processing (for instance, insurance industry):

  • Complex workflows and basic service requirements

  • Basic services and distributed servers

(1)

Offer

verification

Special

audit

(2)

Insurance

offer

Prepare

contracts

(parallel)

Print

documents

(3)

Calculate

surcharges

Client

register

Audit

servers

Client

management

Dept-s for special

audit

Printservers

Form editors

Contract

forms

Mobile radio

GigabitNetwork

Fast Ethernet

Prof. Dr. Alexander Schill


Soa example dynamic business web l.jpg

SOA Example: Dynamic Business Web

Advertising agency

Client

Dealer / Sales

Request

Product information

Offers

Advertising material,

Online presence

Order

Delivery

Payments

Delivery

Large

orders

Engineer

(freelance)

Payments

Requirements

Construction data

Manufacturer

Bank

Video conference

Prof. Dr. Alexander Schill


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SOA: General Scenarios Summarized

  • “Closed service coupling”: e.g. automation of internal office tasks, legacy-integration

  • “Complex business services”: access to services of external partners with close contractual relationship

  • “Dynamic Business-Web”: Interaction of many loosely coupled systems; e.g. between manufacturers and suppliers

  • “Agile company”: comprehensive integration, also with customers and partner enterprises

Prof. Dr. Alexander Schill


Basic technology l.jpg

Basic Technology


Webservices basic technology for soa l.jpg

WebServices: Basic Technology for SOA

Business

Application

(using application servers,

further distributed

internally)

UDDI Registry

WSDL

Description

Discovery

Web Services

Runtime

Web Services Client

SOAP

Firewall

  • WebServices: Software applications accessible via Internet protocols using XML for messaging, description and discovery; W3C standard

Prof. Dr. Alexander Schill


Web services basic building blocks l.jpg

Web Services: Basic Building Blocks

  • Simple Object Access Protocol (SOAP)

    • Remote Procedure Call based on Internet/http and XML

  • Web Service Definition Language (WSDL)

    • Interface specification language based on XML

    • Can be mapped on all kinds of programming languages

  • Universal Description and Integration (UDDI) Service

    • Directory for registering and locating web services

    • Global (www.uddi.org) or intranet-based implementation

  • Specific enhancements

    • WS-Secure Conversation (WS-Trust + WS-Security), WS-Discovery, WS-Eventing, WS-Coordination, WS-Addressing, WS-ReliableMessaging, WS-Notification

      Down-to-earth: RPC + interfaces + directory (like 25 years ago!), but with much better wrapping and integration

Prof. Dr. Alexander Schill


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WSDL (WebServices Description Language)

<binding name=“BankServer“ type=“tns:BankServerPortType“>

<soap:binding style = “rpc“ transport = “http://... “/>

<operation name = “getBalance“>

<soap:operation soapAction = “urn:xmethodsBankServer“/> <input> <AccountIdentification>

<AccountNumber>3044005</AccountNumber>

<pin>****</pin>

<name>John Smith</name>

</AccountIdentification>

</input>

<output> ... </output>

</operation>

</binding>

Call modes: oneway ; request-response (Client/Server)

notification ; solicit-response (Server/Client)

Prof. Dr. Alexander Schill


Slide13 l.jpg

Integration with Middleware

Web Server

HTML-Dokumente

HTML-Dokumente

HTML-Portals

HTML-Dokumente

HTML-Dokumente

Enterprise Application Integration

SOAP

ApplicationServer

Transaction-Monitors

proprietaryProtocols

HTTP

Java-

Client

Businesssoftware

proprietaryProtocols

Inner Firewall

outer Firewall

Mainframe-applications

proprietaryProtocols

HTML-Client

HTTP

Stateful-connection

Data bases

Stateless-connection

Prof. Dr. Alexander Schill


Bpel business process execution language l.jpg

BPEL: Business Process Execution Language

Controlstations

Workflow object

Basic concepts:

  • Composition of WebServices to complex business processes

  • Flexible “orchestration”

  • Support for advanced workflow management; tool support

UDDIServers

Document 1

Document 2

Partial document

Partial document

Dept-s for special

audit

Audit

servers

Form editors

Customer

relations

Printservers

Contract

Mgmt.

Prof. Dr. Alexander Schill


Current trends and research challenges l.jpg

Current Trends and Research Challenges


Trend web services soa and the grid l.jpg

Trend: Web Services / SOA and the Grid

Where web services and the grid meet:

  • Grid services require global integration technology for dynamically sharing and coordinating dispersed, heterogeneous computing resources: WebServices

  • Examples:

    • OGSA (Open Grid Services Architecture): WSDL integration

    • WSRF (Web Services Resource Framework) by Akamai, HP, IBM, Tibco etc.

    • Gridbus project: Bank accounting framework via WebServices (by Univ. Melbourne)

    • NASA´s Information Power Grid

    • [email protected] (Search for Extraterrestial Intelligence) (by Berkeley Univ.)

Prof. Dr. Alexander Schill


Webservice interface of grid technology example l.jpg

WebService Interface of Grid Technology: Example

UDDI

Client

Directory

Search for

application factory

1. Configure computational model

Application

Factory Server

2. Create application service

Application

factory service

Create

1. Run

2. Get model Information

Application

factory

Get resultdata

Run Model

Computational model installed

on a high-performance machine

Prof. Dr. Alexander Schill


World wide grid environment enabled by soa l.jpg

Grid Information Service

Grid Resource Broker

R3

R2

Application

R4

R5

RN

Grid Resource Broker

R6

R1

Resource Broker

Grid Information Service

database

World-wide Grid Environment Enabled by SOA

Selected open issues:

  • Semantic service selection and matching; software reuse based on ontologies

  • Global security and privacy policies

Prof. Dr. Alexander Schill


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Trend: Distributed Multimedia and SOA

Example:

VidConference

System

(VidSoft)

  • Softwarecodecs

  • Multipointservers

  • Javafrontend

  • Middleware/SOA based

Prof. Dr. Alexander Schill


Underlying service architecture l.jpg

Underlying Service Architecture

Conference

Conferencing Client, File and Compression

Server

Servers, Gateways

Multimedia

QoS-

Session

Components

Provision

Management

Sharing

Application

and

Realtime

AV Streams

Scheduling

Interaction

Transport Protocols

Selected open issues:

  • Integration of QoS into software lifecycle (e.g. UML level, CQML, runtime tools)

  • QoS behaviour of complex components / BPEL aggregation

Prof. Dr. Alexander Schill


Trend mobile ubiquitous computing and soa l.jpg

Trend: Mobile / Ubiquitous Computing and SOA

Mobile Application Scenario

Product

data

Central office

=> Caching

Service technician:

Customer

Mobile access

Internet

Open issues:

- Adaptation to highly dynamic network and device characteristics

- Context management, personalization, multimodal applications

Prof. Dr. Alexander Schill


Trend mobile ubiquitous computing and soa22 l.jpg

Internet

Trend: Mobile / Ubiquitous Computing and SOA

Personal

assistant

according to

customer profile

Planning of

tour among

fair booths

Sensor

checks

online-

ticket

Internet-

booking

Online

trip planning

City info. System

gives directions

Mobile device

purchases ticket

-> Security and Privacy?

Remote online hotel checkin,

restaurant reservation

Prof. Dr. Alexander Schill


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Thank You!Questions and Discussion

Prof. Dr. Alexander Schill


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