1. Introduction to Service-Orientation

2. Outline SOA definition and its business and technology values
Service-orientation vs. object-orientation
Service-oriented architecture vs. distributed object architecture
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3. A CD Player Example
Take a CD for instance. If you want to play it, you put your CD into a CD player and the player plays it for you. The CD player offers a CD playing service. Which is nice because you can replace one CD player with another. You can play the same CD on a portable player or on your expensive stereo. They both offer the same CD playing service, but the quality of service is different.
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4. The SOA Story Application 1 Application 2 Business Process
Auto-searchable
Found
Service broker
Services
Registration
Registration
Registration
An SOA enables software components to become standard services that can be invoked at runtime or on demand.
A business-driven SOA strategy will help focus on the goal of Dynamic Business Interoperability and lead to achievement of desired business outcomes.
Organization X
Organization Z
Organization Y
Component
Library
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5. Why Service-Orientation?
Distributed Data
Distributed Computation
Distributed users
…..
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6. Why Service-Orientation?
Interoperation issues
Heterogeneous network protocols
Heterogeneous hardware platforms
Heterogeneous operating systems
Heterogeneous application formats ……
There must be consensus
On Interoperability !
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7. Why Service-Orientation?
Changing Market Dynamics
Business
Technology
Business process decision-making
Rigid organizational structure
Slow and steady economic growth
Long-term product lifecycle
Passive operational risk management
Fixed Costs
Proprietary systems
Labor-intensive
Users adapt to technology
Static
On Demand
Collaborative, integrated value nets
Dynamic, adaptive, learning
Unpredictable fluctuations
Shortening product lifecycle
Proactive risk management
Increased focus on privacy and security
Variable costs
Open, integrated systems
Self-healing, self-managing systems
Technology adapts to users
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8. Why Service-Orientation?
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9. Technology Drivers Software architecture design principles Abstraction
Separation of concerns
Anticipation of changes
Design with reuse
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10. Related Concepts SOA Enterprise Integration Object BPM Oriented
CBSD
Distributed
Computing
Web
Application
CBSD: Component-Based Software Development
BPM: Business Process Management
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11. SOA Evolution SOA Paradigm Program Distributed Computing 1950 1960
1970
1980
1990
2000
Assembler
COBOL
SIMULA
Pascal
Modular2
Smalltalk
PROLOG
Ada
C++
Java C#
VT3270
VT100
Client/Server
RPC
Stored Procedure
TCP/IP
CORBA
EAI
WWW MQ
EJB
NFS
WSDL
SOAP
SOA
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12. SOA Characteristics Based on open standards
Foster inherent reusability
Foster intrinsic interoperability
Emphasizes extensibility
Fundamentally autonomous
Promotes dynamic discovery
Promotes architectural composability
Promotes loose coupling throughout the enterprise
Supports incremental implementation
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13. Service Orientation vs. Object Orientation

14. Conceptual Relationship
Several principles of service-orientation are related to and derived from object-orientation principles.
abstraction -- decomposition
Encapsulation Reusability
Interface first -- Loose coupling
Composition Autonomy
Statelessness -- Discoverability
Some object-orientation principles, such as inheritance, do not fit into the service-orientation world.
Some service-orientation principles, such as loose coupling and autonomy, are not directly promoted by object-orientation.
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15. Conceptual Differences
Service-Orientation
Object-Orientation
Loose coupling between
units of processing logic.
Based on predefined class dependencies,
resulting in more tightly bound objects.
Coarse-grained interfaces (service description)
Message-based communication
Fine-grained interfaces (APIs), Communication
based on RPC or local API calls.
Large unit of processing logic (service),
May vary significantly in scope.
Unit of logic (object) tend to be smaller and
More specific in scope.
Promotes the creation of activity-agnostic
units of processing logic (services) that are
driven into action by intelligent units of
communication (message).
Encourages the binding of processing logic
with data, resulting in highly intelligent
units (object).
Prefers that units of processing logic (services)
be designed to remain as stateless as possible.
Promotes binding of data and logic, resulting
In the creation of more stateful units (objects).
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16. The Paradigm Shift Technology & Methodology Programming Language
OOAD
OO Framework
OODB
OO Process model
Technology &
Methodology
Simula
Smalltalk
Objective C
C++
Java
Programming
Language
UML
Modeling
Object-Oriented
Concept &
Architecture
XML
UDDI
ebXML
WSDL
SOAP
OWL
Standard
Specification
MDA
SO Framework
Ontology / Service DB
SO lifecycle process
Technology &
Methodology
BPEL
WSFL
XLANG
Modeling
Service-Oriented
Concept &
Architecture
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17. Service Oriented Architecture vs. Distributed Object Architecture

18. Distributed System Architecture
Server
Data Management
Application Processing
Two Tier with
Thin Client
Client
Presentation
Presentation
Application Processing
Server
Data Management
Two Tier with
Fat Client
Client
Presentation
Server
Application
Processing
Server
Data
Management
Client
Three Tier
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19. Multi-Tier System Architecture
RPC-based
Client and middleware server is tightly coupled
Remote Object based
Remote objects communicates through standard interface languages
Object models: OMG CORBA, SUN Java RMI, MS DCOM
Web based
Browser + “Dynamic content generation”
Enabling techniques: CGI, Java Servlet/JSP, MS ASP
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20. J2EE Application Architecture
Enterprise
Information
System
Client Side
Presentation
Server Side
Presentation
Server Side
Business Logic
Browser
Web
Server
EJB
Container
Pure
HTML
JSP
EJB
Java
Applet
JSP
EJB
Desktop
Java
Servlet
EJB
Java
Application
Other Device
J2EE
platform
J2EE
platform
J2EE
Client
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21. J2EE Middleware Architecture
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22. J2EE Interoperability
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23. J2EE Services HTTP/HTTPS
JAAS – Java Authorization and Authentication Service
JTA – Java Transaction API
JNDI – Java Naming and Directory Service
RMI-IIOP
JDBC – Java DataBase Connectivity
JMS – Java Message Service
JavaMail
JAXP – Java API for XML Parsing
Java IDL ……
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