introduction to service oriented architecture

1. Service Oriented Architecture
(SOA)
@saeed_shargi

2. Architecture

3. Architecture Definition in IEEE
1471
 Architecture :
The fundamental organization of a system
embodied in it’s components, their relationships
to each other, and to the environment, and the
principles guiding it’s design and evolution
 Architect :
The person, team, or organization responsible for
designing systems architecture

4. Software Architecture
 What is Software Architecture?
 The software architecture of a program or computing
system is a depiction of the system that aids in the
understanding of how the system behave
 Serves as blueprint for both the system and the project
developing
 The primary carrier of system qualities
 An artifact for early analysis
 Set of structures needed to reason about the system
 Documentation of a system

5. SOA

6. SOA
 An architecture style that model system’s information
into services
 Old division between business and IT
 Basic understanding of SOA development as a
application that describe web services
 Logical evolution of the software’s modeling
 Not a new concept

7. SOA Definition from various
viewpoints
SOA is a journey that promises to :
 reduce the lifetime cost of the
application portfolio
 Maximize RIO in both application
and technology resource
 Reduce lead times in delivering
solutions to business

8. SOA Definition from various
viewpoints
SOA is a set of services that can be:
 Exposed to their customers ,partners
and other part of organization
 Business capabilities , function , and
business logic can be combined
 Application serve the business

9. SOA Definition from various
viewpoints
SOA is a way of unlocking value

10. SOA Definition from various
viewpoints
 SOA is a means to create dynamic ,
highly configurable and collaborative
application built for change
 SOA reduce IT complexity and
rigidity
 SOA becomes the solution to stop
the gradual entropy
 SOA reduces lead times and costs

11. SOA Definition from various
viewpoints
SOA is the architectural solution for
integrating diverse systems by
providing an architectural style that
promotes loose coupling and reuse

12. SOA Definition from various
viewpoints
 SOA is a programming model or paradigm
where web services and contracts becomes
a dominate design for interoperability
 Use WSDL or equivalent specification
for describing the service

13. SOA Definition
Delivering on the promises of SOA :
 Improved business agility
 Maximized ROI
 Reduce IT complexity and rigidity
 Reduce costs
 Reduce lead times
 Reduce risk
 New opportunities to deliver value
 Increased participation in value networks
 Incremental implementation

14. Is SOA an Architectural Style?

15. What Are The Fundamental
Constructs Of SOA?

16. What Are The Fundamental
Constructs Of SOA?
 The most basic construct or building block of SOA is a
service
 Service consumer, service provider, service
description, service broker, and a registry are all part of
the DNA of SOA
 A service in SOA is the logical, self-contained business
function

17. What Are The Fundamental
Constructs Of SOA?
 Services in SOA have the following attributes:
 Stateless
 Discoverable
 Self-describing
 Compostable
 Loose coupling
 Governed by policy
 Independent location, language, and protocol

18. What Are The Fundamental
Constructs Of SOA?
 Services in a service-oriented architecture typically
have the following characteristics:
 Coarse-grained
 Asynchronous

19. What Are The Fundamental
Constructs Of SOA?

20. What Are The Fundamental
Constructs Of SOA?

21. SOA Terms
 Service-Orientation
 Services
 Service-Models
 Service Composition
 Service Inventory
 Service-Oriented Analysis
 Service Candidate
 Service-Oriented Design
 Service Contract
 Service-Related Granularity

22. Service-Orientation
 design paradigm intended for the creation of solution logic
units
 As a design paradigm for distributed computing, service-
orientation can be compared to object-orientation

23. Service-Orientation

24. Services
 A unit of solution logic to which service-orientation
has been applied to a meaningful extent.
 As a physically independent software program with
specific design characteristics
 Each service is assigned its own distinct functional
context and is comprised of a set of capabilities related
to this context
 Considered a container of capabilities associated with
a common purpose

25. Services
 Service capabilities declare in service contract

26. Services
 Three common service implementation is :
 Services as Components
 Services as Web Services
 Services as REST Services

27. Services as Component
 A software program designed to be part of a
distributed system
 It provides a technical interface comparable to a
traditional API
 have typically relied on platform-specific development
and runtime technologies

28. Services as Web Services
 Is a body of solution logic that provides a physically
decoupled technical contract consisting of a WSDL
definition and one or more XML Schema definitions
and also possible WS-Policy expressions
 Web service contract exposes public capabilities as
operations
 Service-orientation can be applied to the design of
Web services

29. Services as Web Services

30. Services as REST Services
 Are designed in compliance with the REST
architectural style
 Focuses on the resource as the key element of
abstraction
 Can be further shaped by the application of service-
orientation principles

31. Services Models
 Is a classification used to indicate that a service
belongs to one of several predefined types
 Three service models are common to most enterprise
environments and therefore common to most SOA
projects:
 Task Service
 Entity Service
 Utility Service
 Play an important role during service-oriented
analysis and service oriented design phases

32. Services Composition
 Is an aggregate of services collectively composed to
automate a particular task or business process
 To qualify as a composition, at least two participation
services plus one composition initiator need to be
present
 Can be classified into primitive and complex variations

33. Services Composition

34. Services Inventory
 Is an independently standardized and governed
collection of complementary services within a
boundary that represents an enterprise or a
meaningful segment of an enterprise
 When an organization has multiple service
inventories, this term is further qualified as domain
service inventory

35. Services-Oriented Analysis
 Represents one of the early stages in an SOA initiative
and the first phase in the service delivery cycle
 The service-oriented analysis process is commonly
carried out iteratively, once for each business process
 A key success factor of the service-oriented analysis
process is the hands-on collaboration of both business
analysts and technology architects

36. Services-Oriented Analysis

37. Services Candidate
 Is used to help distinguish a conceptualized service
from an actual implemented service

38. Services-Oriented Design
 Represents a service delivery lifecycle stage dedicated
to producing service contracts in support of the well-
established “contract-first” approach to software
development
 The typical starting point for the service-oriented
design process is a service candidate
 There is a different service-oriented design process for
each of the three common service models

39. Services Contract
 Is comprised of one or more published documents that
express meta information about a service
 The fundamental part of a service contract consists of
the documents that express its technical interface
 When services are implemented as Web services, the
most common service description documents are the
WSDL definition, XML schema definition, and WS-
Policy definition

40. Services Contract

41. Services Contract

42. Services Contract

43. Services-Related Granularity
 there are different granularity levels as follows:
 Service Granularity
 Capability Granularity
 Constraint Granularity
 Data Granularity

44. Services-Related Granularity

45. What Is The Difference Between a
Web Service and an SOA Service?

46. Benefits Of SOA
 New products or processes simply execute
 Flexible systems are not obstacle to changing and
rapid evolution of processes

47. Benefits Of SOA
 Solving complex integration problem of large systems

48. Benefits Of SOA
 Divided of project into smaller components that can
be done independent is simply
 Control of progress in each subproject is calculated

49. Benefits Of SOA
 Integration and connecting to other systems is
dominant approach

50. Benefits Of SOA
 Systems easily meet the requirements of users
 The problem of data transfer between systems is
solved with integration
 Complexity of systems hidden from users

51. Benefits Of SOA
 Enterprise architects believe that the SOA can help the
business to response faster and more cost-effective to
market conditions changing
 This style of architecture use reusability in macro level
instead micro level

52. Orchestration and Choreography
Without process engine
Sequence of transaction
messages register and
controlled by players
Have a process engine
Call set of services to complete
process
Maybe call external services
Sample of this system is
BPMS

53. Principles of SOA
 Loose coupling
 Service contract to communications agreement
 Encapsulation of internal implementation
 Reusability
 Composability
 Statelessness Services
 Discoverability Services
 Autonomy Services

54. SOA Tools
Company Tools Name
Oracle Oracle SOA Suite
Microsoft BizTalk Server - WCF
IBM WebSphere