service composability principles of SOA

1. Principles OF
SOAFrom knowledge
To practice
SUBMITTED BY : MOHAMED ZAKARYA

2. AGENDA
 Service orientation principles
 Standardized Service Contract
 Service Reusability
 Service Discoverability
 Service Composability
 Service Loose Coupling
 Service Abstraction
 Service Autonomy
 Service Statelessness
 Thanks 

3. PART 1
INTRODUCTION

4. DAY 3 REVIEW
TERM
Service discoverability UDDI Service profile
Service capability profile Service provider Service consumer
Service loosely coupling Logic - contract coupling Consumer – contract coupling

5. SERVICE ORIENTATION PRINCIPLES
Standardized
Service
Contract
Service
Reusability
Service
Composability
Service
Autonomy
Service
Loose
Coupling
Service
Statelessness
Service
Abstraction
Service
Discoverability

6. SERVICE ORIENTATION PRINCIPLES
Service Reusability
Service contain agnostic logic that can be position as reusable enterprise resource.
Standardized Service Contract
Service in same inventory are in compliance of same design service contract standards.
Service Composition
Services are effective composition participants.
Service Discoverability
Service meta data available for discoverability and interpreted.
Service Loose Coupling
Contract decoupled from surrounding environment.
Service Autonomy
Services exercise a high level of control over their underlying runtime execution environment.
Service Statelessness
Services minimize resource consumption , reduce state information.
Service Abstraction
Contract contains only essential information , that is published to consumers.

7. PART 1
SERVICE
COMPOSITIOABILITY

8. INTRODUCTION
Service Composition
Services are effective composition participants.
Composition considered as a form of service reuse

9. DECOMPOSITION
The separation of concerns theory
encourages us to
break down
a larger problem
Into
multiple smaller Problems
(concerns)

10. COMPOSITION

11. RE-COMPOSITION
The same units originally created
to solve Big Problem A
are recomposed (plus new other services I + J)
to collectively solve a different problem

12. COMPOSITION EXAMPLE
composition is nothing new.
service-oriented composition
equivalent to past composition variations

13. ABOUT THE PRINCIPLE
Title
Services are composable.
Description
Services are effective composition participants, regardless of the size and complexity of the composition
Goals
increase ROI
Increase
business agility
much all of the goals of Service Reusability apply
Provide means for a large extent of future business
automation requirements to be fulfilled through

14. ABOUT THE PRINCIPLE
Implementation requirements
Runtime Hosting Environment
scalable and reliable as possible .
Need for dedicated, clustered servers with fail-over
Services implemented as Web services
Often require standardized implementations of several
key WS-* extensions.
Including security, reliable, messaging, activity
management, and cross-service transactions.

15. COMPOSITION CONCEPTS AND TERMINOLOGY
1. Composition
2. Composition Instance
3. Composition Member
4. Composition Controller
5. Composition Sub-Controller
6. Composition Member Capability
7. Composition Controller Capability
8. Designated Controller
9. Service Activity
10. Point-to-Point
11. Composition Initiator

16. 1. COMPOSITION & COMPOSITION INSTANCE
Service Composition
Automation of a business process
( Static business process definition)
Composition instance :
what happens when an occurrence of the workflow logic
is carried out by a series of service instances at runtime.

17. 2. COMPOSITION MEMBER & COMPOSITION CONTROLLER
1. Composition Controller
Composition controller capability
service is located at head
of a composition hierarchy.
2. Composition Member
Composition member capability
service being composed by
Another.
Individual service capabilities that
are responsible for placing services
into these roles.

18. 3. COMPOSITION SUB CONTROLLER & DESIGNATED CONTROLLER
Composition sub Controller:
Composition members that
compose other services
Designated Controllers :
Service limits to controller role only

19. 4. SERVICE ACTIVITIES
Service activity :
 Mapping of an inter-service message path
 Representing interaction between services only
 Does not represent what occurs within
the underlying service logic

20. 5. COMPOSITION INITIATOR
Composition initiator :
A runtime component that exists outside of this boundary is usually represented
by the service consumer program responsible for invoking the composition controller
in order to kick off the service composition.
Program responsible for initiating the composition logic.
Generally not a composition controller
Service consumer :
Can assume the roles of both composition initiator and composition controller

21. 6. POINT TO POINT DATA EXCHANGE
A simple interaction between a single service and its consumer
Point to point not consider a service composition.
Minimum scope of a service composition two services plus the composition initiator.

22. SERVICE COMPOSABILITY DEMO
‫عملية‬‫نقل‬‫المواد‬‫البريدية‬‫من‬‫اإلستالم‬‫الي‬‫التسليم‬‫للعميل‬
‫إستالم‬‫من‬
‫العميل‬
‫المعالجة‬
‫الترحيل‬
‫التوزيع‬
‫إرسال‬
‫رسالة‬
‫للعميل‬‫توزيع‬‫نفس‬‫المكتب‬
‫التسليم‬
‫النهائي‬

23. REFERENCES
http://www.soaschool.com/
http://serviceorientation.com/index.php/soaglossary/index
http://soapatterns.org/
http://www.servicetechmag.com/
http://www.soaschool.com/certifications
http://www.servicetechbooks.com/

24. ANY QUESTIONS

25. THANKS
ENJOY SOA .. WAIT FOR NEXT
MAIL: ENG.MOHAMEDZAKARYA@GMAIL.COM