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Service-oriented architecture

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There is no widely agreed upon definition ofservice-oriented architecture other than its

literal translation that it is an architecture that relies on service-orientation as itsfundamental design principle. Service-orientation describes an architecture that uses

loosely coupledservicesto support the requirements of business processes and users.

Resources on a network[1] in a SOA environment are made available as independentservices that can be accessed without knowledge of their underlying platform

implementation.[2] These concepts can be applied to business, software and other types of

producer/consumer systems.

Contents

[hide]

1 Other SOA Concepts

2 SOA definitions

3 Why SOA?

4 SOA principles

5 Service-oriented design and development

o 5.1 Service contract

6 SOA and web service protocols 7 SOA, Web 2.0, and mashups

8 SOA 2.0 or Advanced SOA

9 What are the challenges faced in SOA adoption? 10 Criticisms of SOA

11 SOA and Business Architecture

12 SOA and network management architecture

13 Jargon
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14 Literature

o 14.1 Books, non-technical

o 14.2 Books, technical

o 14.3 Articles/Papers, non-technical

o 14.4 Articles/Papers, technical

o 14.5 Standards 15 References

16 See also

17 External links

[edit] Other SOA Concepts

Architecture is not tied to a specific technology. It may be implemented using a wide

range of technologies, includingREST, RPC, DCOM, CORBA, Web ServicesorWCF.

SOA can be implemented using one of these protocols and, for example, might use a filesystem mechanism to communicate data conforming to a defined interface specification

between processes conforming to the SOA concept. The key is independent services with

defined interfaces that can be called to perform their tasks in a standard way, without the

service having foreknowledge of the calling application, and without the applicationhaving or needing knowledge of how the service actually performs its tasks.

Elements of SOA, by Dirk Krafzig, Karl Banke, and Dirk Slama. Enterprise SOA.

Prentice Hall, 2005

SOA Meta Model, The Linthicum Group, 2007

SOA can also be regarded as a style of information systems architecture that enables the

creation of applications that are built by combiningloosely coupledandinteroperable

services[citation needed]. These services inter-operate based on a formal definition (or contract,e.g.,WSDL) that is independent of the underlying platform and programming language.
http://en.wikipedia.org/wiki/Service-oriented_architecture#Literaturehttp://en.wikipedia.org/wiki/Service-oriented_architecture#Books.2C_non-technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Books.2C_technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Articles.2FPapers.2C_non-technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Articles.2FPapers.2C_technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Standardshttp://en.wikipedia.org/wiki/Service-oriented_architecture#Referenceshttp://en.wikipedia.org/wiki/Service-oriented_architecture#See_alsohttp://en.wikipedia.org/wiki/Service-oriented_architecture#External_linkshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=1http://en.wikipedia.org/wiki/Representational_State_Transferhttp://en.wikipedia.org/wiki/Representational_State_Transferhttp://en.wikipedia.org/wiki/Remote_procedure_callhttp://en.wikipedia.org/wiki/Distributed_Component_Object_Modelhttp://en.wikipedia.org/wiki/Common_Object_Request_Broker_Architecturehttp://en.wikipedia.org/wiki/Web_Serviceshttp://en.wikipedia.org/wiki/Web_Serviceshttp://en.wikipedia.org/wiki/Windows_Communication_Foundationhttp://en.wikipedia.org/wiki/Windows_Communication_Foundationhttp://en.wikipedia.org/wiki/Loosely_coupledhttp://en.wikipedia.org/wiki/Loosely_coupledhttp://en.wikipedia.org/wiki/Loosely_coupledhttp://en.wikipedia.org/wiki/Interoperablehttp://en.wikipedia.org/wiki/Interoperablehttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/WSDLhttp://en.wikipedia.org/wiki/WSDLhttp://en.wikipedia.org/wiki/Image:SOA_Meta_Model.jpghttp://en.wikipedia.org/wiki/Image:SOA_Meta_Model.jpghttp://en.wikipedia.org/wiki/Image:SOA_Elements.pnghttp://en.wikipedia.org/wiki/Image:SOA_Elements.pnghttp://en.wikipedia.org/wiki/Service-oriented_architecture#Literaturehttp://en.wikipedia.org/wiki/Service-oriented_architecture#Books.2C_non-technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Books.2C_technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Articles.2FPapers.2C_non-technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Articles.2FPapers.2C_technicalhttp://en.wikipedia.org/wiki/Service-oriented_architecture#Standardshttp://en.wikipedia.org/wiki/Service-oriented_architecture#Referenceshttp://en.wikipedia.org/wiki/Service-oriented_architecture#See_alsohttp://en.wikipedia.org/wiki/Service-oriented_architecture#External_linkshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=1http://en.wikipedia.org/wiki/Representational_State_Transferhttp://en.wikipedia.org/wiki/Remote_procedure_callhttp://en.wikipedia.org/wiki/Distributed_Component_Object_Modelhttp://en.wikipedia.org/wiki/Common_Object_Request_Broker_Architecturehttp://en.wikipedia.org/wiki/Web_Serviceshttp://en.wikipedia.org/wiki/Windows_Communication_Foundationhttp://en.wikipedia.org/wiki/Loosely_coupledhttp://en.wikipedia.org/wiki/Interoperablehttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/WSDL


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The interface definition hides the implementation of the language-specific service. SOA-

based systems can therefore be independent of development technologies and platforms

(such as Java,.NET etc). Services written inC# running on .NET platforms and serviceswritten in Java running on Java EE platforms, for example, can both be consumed by a

common composite application. Applications running on either platform can also

consume services running on the other as Web services, which facilitates reuse.

SOA can support integration and consolidation activities within complex enterprisesystems, but SOA does not specify or provide a methodology orframeworkfor

documenting capabilities or services.

High-level languagessuch as BPEL and specifications such as WS-CDL and WS-

Coordination extend the service concept by providing a method of defining andsupporting orchestration of fine grained services into more coarse-grained business

services, which in turn can be incorporated into workflows and business processes

implemented in composite applicationsorportals[citation needed ].

The use ofService component architecture (SCA) to implement SOA is a current area of

research.

[edit] SOA definitions

SOA is a design for linking business and computational resources (principallyorganizations, applications and data) on demand to achieve the desired results for service

consumers (which can be end users or other services). OASIS (the Organization for the

Advancement of Structured Information Standards) defines SOA as the following:

A paradigm for organizing and utilizing distributed capabilities that may be under thecontrol of different ownership domains. It provides a uniform means to offer, discover,

interact with and use capabilities to produce desired effects consistent with measurablepreconditions and expectations.

There are multiple definitions of SOA, theOASISgroup and the Open Group havecreated formal definition with depth which can be applied to both the technology and

business domains.

Open Group SOA Definition (SOA-Definition)[3]

OASIS SOA Reference Model (SOA-RM)[4]

What Is Service-Oriented Architecture? (XML.com) What is Service-Oriented Architecture? (Javaworld.com)

Webopedia definition

TechEncyclopedia definition

Object Management Group (OMG) SOA Special Interest Group definition

WhatIs.com definition

SearchWebServices.comNumerous SOA definitions by industry experts
http://en.wikipedia.org/wiki/Information_hidinghttp://en.wikipedia.org/wiki/Java_platformhttp://en.wikipedia.org/wiki/Java_platformhttp://en.wikipedia.org/wiki/Microsoft_.NEThttp://en.wikipedia.org/wiki/C_Sharphttp://en.wikipedia.org/wiki/C_Sharphttp://en.wikipedia.org/wiki/Java_Platform%2C_Enterprise_Editionhttp://en.wikipedia.org/wiki/Enterprise_architecturehttp://en.wikipedia.org/wiki/Frameworkhttp://en.wikipedia.org/wiki/Frameworkhttp://en.wikipedia.org/wiki/Frameworkhttp://en.wikipedia.org/wiki/High-level_programming_languagehttp://en.wikipedia.org/wiki/High-level_programming_languagehttp://en.wikipedia.org/wiki/BPELhttp://en.wikipedia.org/w/index.php?title=WS-CDL&action=edithttp://en.wikipedia.org/wiki/WS-Coordinationhttp://en.wikipedia.org/wiki/WS-Coordinationhttp://en.wikipedia.org/wiki/Orchestration_(computers)http://en.wikipedia.org/wiki/Composite_applicationshttp://en.wikipedia.org/wiki/Composite_applicationshttp://en.wikipedia.org/wiki/Portalshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Service_component_architecturehttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=2http://en.wikipedia.org/wiki/Organization_for_the_Advancement_of_Structured_Information_Standardshttp://en.wikipedia.org/wiki/Organization_for_the_Advancement_of_Structured_Information_Standardshttp://en.wikipedia.org/wiki/OASIS_(organization)http://en.wikipedia.org/wiki/OASIS_(organization)http://en.wikipedia.org/wiki/OASIS_(organization)http://en.wikipedia.org/wiki/The_Open_Grouphttp://en.wikipedia.org/w/index.php?title=Open_Group_SOA_Definition&action=edithttp://en.wikipedia.org/wiki/Service-oriented_architecture#_note-2http://en.wikipedia.org/wiki/OASIS_SOA_Reference_Modelhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_note-3http://www.xml.com/pub/a/ws/2003/09/30/soa.htmlhttp://www.javaworld.com/javaworld/jw-06-2005/jw-0613-soa.htmlhttp://isp.webopedia.com/TERM/S/Service_Oriented_Architecture.htmlhttp://www.techweb.com/encyclopedia/defineterm.jhtml?term=soahttp://www.omg.org/http://www.omg.org/http://soa.omg.org/http://searchwebservices.techtarget.com/gDefinition/0,294236,sid26_gci929153,00.htmlhttp://searchwebservices.techtarget.com/originalContent/0,289142,sid26_gci1017004,00.htmlhttp://searchwebservices.techtarget.com/originalContent/0,289142,sid26_gci1017004,00.htmlhttp://en.wikipedia.org/wiki/Information_hidinghttp://en.wikipedia.org/wiki/Java_platformhttp://en.wikipedia.org/wiki/Microsoft_.NEThttp://en.wikipedia.org/wiki/C_Sharphttp://en.wikipedia.org/wiki/Java_Platform%2C_Enterprise_Editionhttp://en.wikipedia.org/wiki/Enterprise_architecturehttp://en.wikipedia.org/wiki/Frameworkhttp://en.wikipedia.org/wiki/High-level_programming_languagehttp://en.wikipedia.org/wiki/BPELhttp://en.wikipedia.org/w/index.php?title=WS-CDL&action=edithttp://en.wikipedia.org/wiki/WS-Coordinationhttp://en.wikipedia.org/wiki/WS-Coordinationhttp://en.wikipedia.org/wiki/Orchestration_(computers)http://en.wikipedia.org/wiki/Composite_applicationshttp://en.wikipedia.org/wiki/Portalshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Service_component_architecturehttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=2http://en.wikipedia.org/wiki/Organization_for_the_Advancement_of_Structured_Information_Standardshttp://en.wikipedia.org/wiki/Organization_for_the_Advancement_of_Structured_Information_Standardshttp://en.wikipedia.org/wiki/OASIS_(organization)http://en.wikipedia.org/wiki/The_Open_Grouphttp://en.wikipedia.org/w/index.php?title=Open_Group_SOA_Definition&action=edithttp://en.wikipedia.org/wiki/Service-oriented_architecture#_note-2http://en.wikipedia.org/wiki/OASIS_SOA_Reference_Modelhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_note-3http://www.xml.com/pub/a/ws/2003/09/30/soa.htmlhttp://www.javaworld.com/javaworld/jw-06-2005/jw-0613-soa.htmlhttp://isp.webopedia.com/TERM/S/Service_Oriented_Architecture.htmlhttp://www.techweb.com/encyclopedia/defineterm.jhtml?term=soahttp://www.omg.org/http://soa.omg.org/http://searchwebservices.techtarget.com/gDefinition/0,294236,sid26_gci929153,00.htmlhttp://searchwebservices.techtarget.com/originalContent/0,289142,sid26_gci1017004,00.html


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Though many definitions of SOA limit themselves to technology or just web services,

this is predominantly pushed by technology vendors; in 2003 they talked just of web

services, while in 2006 the talk is of events and process engines. [citation needed]

[edit] Why SOA?

The main drivers for SOA adoption are that it links computational resources and

promotes their reuse. Enterprise architectsbelieve that SOA can help businesses respond

more quickly and cost-effectively to changing market conditions[5] . This style of

architecture promotes reuse at the macro(service) level rather than micro(objects) level.

It can also simplify interconnection to - and usage of - existing IT (legacy) assets.

SOA Practitioners Guide: Why Services-Oriented Architecture? provides a high-level

summary on SOA.

In some respects, SOA can be considered an architectural evolution rather than a

revolution and captures many of the best practices of previous software architectures. Incommunications systems, for example, there has been little development of solutions thatuse truly static bindings to talk to other equipment in the network. By formally embracing

a SOA approach, such systems are better positioned to stress the importance of well-

defined, highly inter-operable interfaces.[citation needed]

Some have questioned whether SOA is just a revival of modular programming (1970s),event-oriented design (1980s) or interface/component-based design (1990s)[citation needed].

SOA promotes the goal of separating users (consumers) from the service

implementations. Services can therefore be run on various distributed platforms and be

accessed across networks. This can also maximize reuse of services[citation needed].

[edit] SOA principles

The following guiding principles define the ground rules for development, maintenance,

and usage of the SOA[6]

Reuse, granularity, modularity, composability, componentization, andinteroperability

Compliance to standards (both common and industry-specific)

Services identification and categorization, provisioning and delivery, and

monitoring and tracking

The following specific architectural principles for design and service definition focus

on specific themes that influence the intrinsic behaviour of a system and the style of its

design:

Service Encapsulation
http://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=3http://en.wikipedia.org/wiki/Enterprise_architecthttp://en.wikipedia.org/wiki/Enterprise_architecthttp://en.wikipedia.org/wiki/Service-oriented_architecture#_note-4http://www.soablueprint.com/whitepapers/SOAPGPart1.pdfhttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=4http://en.wikipedia.org/wiki/Service-oriented_architecture#_note-5http://en.wikipedia.org/wiki/Granularityhttp://en.wikipedia.org/wiki/Modularity_(programming)http://en.wikipedia.org/wiki/Interoperabilityhttp://en.wikipedia.org/wiki/Encapsulationhttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=3http://en.wikipedia.org/wiki/Enterprise_architecthttp://en.wikipedia.org/wiki/Service-oriented_architecture#_note-4http://www.soablueprint.com/whitepapers/SOAPGPart1.pdfhttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=4http://en.wikipedia.org/wiki/Service-oriented_architecture#_note-5http://en.wikipedia.org/wiki/Granularityhttp://en.wikipedia.org/wiki/Modularity_(programming)http://en.wikipedia.org/wiki/Interoperabilityhttp://en.wikipedia.org/wiki/Encapsulation


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Service Loose coupling- Services maintain a relationship that minimizes

dependencies and only requires that they maintain an awareness of each other

Service contract - Services adhere to a communications agreement, as definedcollectively by one or more service description documents

Service abstraction - Beyond what is described in the service contract, services

hide logic from the outside world Service reusability - Logic is divided into services with the intention of

promoting reuse

Service composability - Collections of services can be coordinated andassembled to form composite services

Service autonomy Services have control over the logic they encapsulate

Service optimization All else equal, high-quality services are generally

considered preferable to low-quality ones Service discoverability Services are designed to be outwardly descriptive so

that they can be found and assessed via available discovery mechanisms[7]

In addition, the following factors should also be taken into account when defining a SOAimplementation:

SOA Reference ArchitectureSOA Practitioners Guide Part 2: SOA Reference

Architecture covers the SOA Reference Architecture, which provides a worked

design of an enterprise-wide SOA implementation with detailed architecturediagrams, component descriptions, detailed requirements, design patterns,

opinions about standards, patterns on regulation compliance, standards templates

etc.

Life cycle managementSOA Practitioners Guide Part 3: Introduction to ServicesLifecycleintroduces the Services Lifecycle and provides a detailed process for

services management though the service lifecycle, from inception through toretirement or repurposing of the services. It also contains an appendix thatincludes organization and governance best practices, templates, comments on key

SOA standards, and recommended links for more information.

Efficient use of system resources

Service maturity and performance

EAI Enterprise Application Integration

[edit] Service-oriented design and development

This section does not cite any references or sources.Please help improve this section by adding citations to reliable sources. (help,get involved!)Unverifiablematerial may be challenged and removed.

This article has been tagged since June 2006.

The modelling and design methodology for SOA applications has become known by theterms service-oriented analysis and designandSOAD[8]. SOAD is a design methodology

for developing highly-agile systems in a consumer/producer model that abstracts
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implementation from process, such that a service-provider can be modified or changed

without affecting the consumer.

[edit] Service contract

A service contract needs to have the following components:

Header

o Name - Name of the service. Should indicate in general terms what it

does, but not be the only definition

o Version - The version of this service contract

o Owner - The person/team in charge of the service

o RACI

Responsible - The role the person/team is responsible for thedeliverables of this contract/service. All versions of the contract

Accountable - Ultimate Decision Maker in terms of this

contract/service Consulted - Who must be consulted before action is taken on this

contract/service. This is 2-way communication. These people have

an impact on the decision and/or the execution of that decision.

Informed - Who must be informed that a decision or action is beingtaken. This is a 1-way communication. These people are impacted

by the decision or execution of that decision, but have no control

over the action.o Type - This is the type of the service to help distinguish the layer in which

it resides. Different implementations will have different service types.

Examples of service types include:

Presentation Process

Business

Data Integration

Functional

o Functional Requirement (From Requirements Document) - Indicates the

functionality in specific bulleted items what exactly this service

accomplishes. The language should be such that it allows test cases to

prove the functionality is accomplished.o Service Operations - Methods, actions etc. Must be defined in terms of

what part of the Functionality it provides.o Invocation - Indicates the invocation means of the service. This includes

the URL, interface, etc. There may be multiple Invocation paths for the

same service. We may have the same functionality for an internal and

external clients each with a different invocation means and interface.Examples:

SOAP

REST
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Events Triggers

Non-Functional

o Security Constraints - Defines who can execute this service in terms of

roles or individual partners, etc. and which invocation mechanism they can

invoke.

o

Quality of Service - Determines the allowable failure rateo Transactional - Is this capable of acting as part of a larger transaction and

if so, how do we control that?

o Service Level Agreement - Determines the amount of latency the service

is allowed to have to perform its actions

o Semantics - Dictates or defines the meaning of terms used in the

description and interfaces of the serviceo Process - Describes the process, if any, of the contracted service

[edit] SOA and web service protocols

This section does not cite any references or sources.Please help improve this section by adding citations to reliable sources. (help,get involved!)

Unverifiablematerial may be challenged and removed.


SOA may be built on Web servicesstandards (e.g., using SOAP) that have gained broadindustry acceptance. These standards (also referred to asweb service specifications) also

provide greater interoperability and some protection from lock-in to proprietary vendor

software. One can, however, implement SOA using any service-based technology, suchas Jini.

Service-oriented architecture is often defined as services exposed using the Web Services

Protocol Stack[citation needed ] . The base level of web services standards relevant to SOA

includes the following:

XML - a markup language for describing data in message payloads in a documentformat

HTTP (orHTTPS) - request/response protocol between clients and servers used to

transfer or convey information

SOAP - a protocol for exchanging XML-based messages over a computer

network, normally using HTTP

XACML - a markup language for expressing access control rules and policies. Web Services Description Language (WSDL) - XML-based service description

that describes the public interface, protocol bindings and message formats

required to interact with a web service

Universal Description, Discovery, and Integration (UDDI) - An XML-basedregistry to publish service descriptions (WSDL) and allow their discovery
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Note, however, that a system does not necessarily need to use any or all of these

standards to be "service-oriented." For example, some service oriented systems have been

implemented using Corba, Jini and REST.

[edit] SOA, Web 2.0, and mashups

Web 2.0 refers to a "second generation" of web sites, primarily distinguished by the

ability of visitors to contribute information for collaboration and sharing. Web 2.0

applications use Web services and may includeAjax, Flash, Silverlight orJavaFXuserinterfaces, Web syndication,blogs, and wikis. While there are no set standards for Web

2.0, it is characterised by building on the existing web server architecture and using

services. Web 2.0 can therefore be regarded as displaying some SOA characteristics[9].

Mashups are also regarded by some as Web 2.0 applications. The term "enterprisemashup" has been coined to describe Web applications that combine content from more

than one source into an integrated experience, which share many of the characteristics of

service-oriented business applications (SOBAs), which are applications composed ofservices in a declarative manner. There is ongoing debate about "the collision of Web 2.0,

mashups, and SOA", with some stating that Web 2.0 applications are a realisation of

SOA composite and business applications. [10]

[edit] SOA 2.0 or Advanced SOA

Amid much negative reaction, Oracleis taking up SOA 2.0 as "the next-generation

version of SOA" combining service-oriented architecture and Event Driven Architecture,

and categorizing the first iteration of SOA as client-server driven[11] . Even though Oracle

indicates that Gartneris coining a new term, Gartner analysts indicate that they call thisadvanced SOA and it is 'whimsically' referred to as SOA 2.0.[12]Most of the pure-play

middleware vendors (e.g., webMethods and TIBCO) have had SOA 2.0 attributes foryears. SOA 2.0 can therefore be regarded as "more marketing noise than anything else"[13]

and product evangelism rather than a new "way of doing things".

However, other industry commentators have criticized attaching a version number to anapplication architecture design approach, while others have stated that the "next

generation" should apply to the evolution of SOA techniques from IT optimization to

business development[14].

[edit] What are the challenges faced in SOA adoption?


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One obvious and common challenge faced is managing servicesmetadata[citation needed ].

SOA-based environments can include many services which exchange messages to

perform tasks. Depending on the design, a single application may generate millions ofmessages. Managing and providing information on how services interact is a complicated

task.

Another challenge is providing appropriate levels of security. Security model built into

an application may no longer be appropriate when the capabilities of the application areexposed as services that can be used by other applications. That is, application-managed

security is not the right model for securing services. A number of new technologies and

standards are emerging to provide more appropriate models for security in SOA. SeeSOA Security entry for more info.

As SOA and theWS-* specificationsare constantly being expanded, updated and refined,

there is a shortage of skilled people to work on SOA based systems, including the

integration of services and construction of services infrastructure.

Interoperability is another important aspect in the SOA implementations. The WS-I

organization has developed Basic Profile (BP) and Basic Security Profile (BSP) to

enforce compatibility. Testing tools have been designed by WS-I to help assess whether

web services are conformant with WS-I profile guidelines. Additionally, another Charterhas been established to work on the Reliable Secure Profile.

There is significant vendor hype concerning SOA that can create expectations that may

not be fulfilled. Product stacks are still evolving as early adopters test the development

and runtime products with real world problems. SOA does not guarantee reduced ITcosts, improved systems agility or faster time to market. Successful SOA

implementations may realise some or all of these benefits depending on the quality andrelevance of the system architecture and design[15] . See also:WS-MetadataExchangeOWL-S Abrobit Roy

[edit] Criticisms of SOA

Some criticisms of SOA are based on the assumption that SOA is just another term for

Web Services. For example, some critics claim SOA results in the addition of XMLlayers introducing XML parsing and composition. In the absence of native or binary

forms ofRemote Procedure Call (RPC) applications could run slower and require more

processing power, increasing costs. Most implementations do incur these overheads, but

SOA can be implemented using technologies (for example, Java Business Integration(JBI)) which do not depend on remote procedure calls or translation through XML.

However, there are emerging and open-source XML parsing technolgies, such asVTD-

XML, and various XML-compatible binary formats (http://vtd-

xml.sf.net/persistence.html) that promise to significantly improve the SOA performance.

Stateful services require both the consumer and the provider to share the same consumer-

specific context, which is either included in or referenced by messages exchanged
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between the provider and the consumer. The drawback of this constraint is that it could

reduce the overall scalability of the service provider because it might need to remember

the shared context for each consumer. It also increases the coupling between a serviceprovider and a consumer and makes switching service providers more difficult.

Another concern is that WS-* standards and products are still evolving (e.g.,transaction, security), and SOA can thus introduce new risks unless properly managed

and estimated with additional budget and contingency for additional Proof of Conceptwork.

An informal survey by Network Computing placed SOA as the most despised buzzword

(November 2006).

Some critics feel SOA is merely an obvious evolution of currently well-deployedarchitectures (open interfaces, etc).

A SOA being an architecture is the first stage of representing the system components thatinterconnect for the benefit of the business. At this level a SOA is just an evolution of an

existing architecture and business functions. SOAs are normally associated withinterconnecting back end transactional systems that are accessed via web services.

The real issue with any IT "architecture" is how one defines the information management

model and operations around it that deal with information privacy, reflect the business's

products and services, enable services to be delivered to the customers, allow for selfcare, preferences and entitlements and at the same time embrace identity management

and agility. On this last point, system modification (agility) is a critical issue which is

normally omitted from IT system design. Many systems, including SOAs, hard code the

operations, goods and services of the organisation thus restricting their online service andbusiness agility in the global market place.

Adopting SOAs is therefore just the first (diagrammatic) step in defining a real business

system. The next step in the design process is the definition of a Service DeliveryPlatform (SDP) and its implementation. It is in the SDP design phase where one defines

the business information models, identity management, products, content, devices, and

the end user service characteristics, as well as how agile the system is so that it can dealwith the evolution of the business and its customers.

[edit] SOA and Business Architecture

One area where SOA has been gaining ground is in its power as a mechanism for

defining business services and operating models and thus provide a structure for IT todeliver against the actual business requirements and adapt in a similar way to the

business. The purpose of using SOA as a business mapping tool is to ensure that the

services created properly represent the business view and are not just what technologiststhink the business services should be. At the heart of SOA planning is the process of

defining architectures for the use of information in support of the business, and the plan
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for implementing those architectures (Enterprise Architecture Planning by Steven

Spewak and Steven Hill). Enterprise Business Architecture should always represent the

highest and most dominant architecture. Every service should be created with the intentto bring value to the business in some way and must be traceable back to the business

architecture.

Within this area, SOMA (Service-Oriented Modelling and Architecture) was announced

by IBM as the first SOA-related methodology in 2004. Since then, efforts have beenmade to move towards greater standardization and the involvement of business

objectives, particularly within the OASIS standards group and specifically theSOA

Adoption Blueprints group. All of these approaches take a fundamentally structuredapproach to SOA, focusing on the Services and Architecture elements and leaving

implementation to the more technically focused standards.

[edit] SOA and network management architecture

The principles of SOA are currently being applied to the field ofnetwork management.Examples of Service-Oriented network management architectures are TS 188 001NGN

Management OSS Architecture from ETSI, and the recently published M.3060Principlesfor the Management Of Next Generation Networks recommendation from the ITU-TSOA.

Tools for managing SOA infrastructure include:

Symantec APM

HyPerformix IPS Performance Optimizer

HP Management Software / Mercury SOA Manager IBM Tivoli Framework Tidal Software Intersperse

[edit] Jargon



SOA is an architectural style rather than a product. Several vendors offer products which

can form the basis of, or enable, SOA--particularly Enterprise Service Bus(ESB)

products. ESBs provide infrastructure that can be purchased, implemented and leveragedfor SOA-based systems[citation needed]. SOA relies heavily on metadata design and

management. Metadata design and management products are also critical to

implementing SOA architectures. See the list of SOA related products for an overviewand ideas.
http://en.wikipedia.org/wiki/SOMA_(Service-Oriented_Modelling_and_Architecture)http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/OASIS_(organization)http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-blueprintshttp://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-blueprintshttp://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-blueprintshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=13http://en.wikipedia.org/wiki/Network_managementhttp://en.wikipedia.org/wiki/ETSIhttp://en.wikipedia.org/wiki/ITU-Thttp://en.wikipedia.org/w/index.php?title=Symantec_APM&action=edithttp://en.wikipedia.org/wiki/HyPerformixhttp://en.wikipedia.org/w/index.php?title=HP_Management_Software_/_Mercury_SOA_Manager&action=edithttp://en.wikipedia.org/wiki/IBM_Tivoli_Frameworkhttp://en.wikipedia.org/w/index.php?title=Tidal_Software_Intersperse&action=edithttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=14http://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edithttp://en.wikipedia.org/wiki/Wikipedia:Reliable_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Reliable_sourceshttp://en.wikipedia.org/wiki/Help:Contentshttp://en.wikipedia.org/wiki/Help:Contentshttp://en.wikipedia.org/wiki/Wikipedia:WikiProject_Fact_and_Reference_Checkhttp://en.wikipedia.org/wiki/Wikipedia:WikiProject_Fact_and_Reference_Checkhttp://en.wikipedia.org/wiki/Wikipedia:WikiProject_Fact_and_Reference_Checkhttp://en.wikipedia.org/wiki/Wikipedia:Verificationhttp://en.wikipedia.org/wiki/Wikipedia:Verificationhttp://en.wikipedia.org/wiki/Wikipedia:BOLD%2C_revert%2C_discuss_cyclehttp://en.wikipedia.org/wiki/Wikipedia:BOLD%2C_revert%2C_discuss_cyclehttp://en.wikipedia.org/wiki/Enterprise_Service_Bushttp://en.wikipedia.org/wiki/Enterprise_Service_Bushttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/List_of_SOA_related_productshttp://en.wikipedia.org/wiki/Image:Information.svghttp://en.wikipedia.org/wiki/SOMA_(Service-Oriented_Modelling_and_Architecture)http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/OASIS_(organization)http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-blueprintshttp://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-blueprintshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=13http://en.wikipedia.org/wiki/Network_managementhttp://en.wikipedia.org/wiki/ETSIhttp://en.wikipedia.org/wiki/ITU-Thttp://en.wikipedia.org/w/index.php?title=Symantec_APM&action=edithttp://en.wikipedia.org/wiki/HyPerformixhttp://en.wikipedia.org/w/index.php?title=HP_Management_Software_/_Mercury_SOA_Manager&action=edithttp://en.wikipedia.org/wiki/IBM_Tivoli_Frameworkhttp://en.wikipedia.org/w/index.php?title=Tidal_Software_Intersperse&action=edithttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=14http://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edithttp://en.wikipedia.org/wiki/Wikipedia:Reliable_sourceshttp://en.wikipedia.org/wiki/Help:Contentshttp://en.wikipedia.org/wiki/Wikipedia:WikiProject_Fact_and_Reference_Checkhttp://en.wikipedia.org/wiki/Wikipedia:Verificationhttp://en.wikipedia.org/wiki/Wikipedia:BOLD%2C_revert%2C_discuss_cyclehttp://en.wikipedia.org/wiki/Enterprise_Service_Bushttp://en.wikipedia.org/wiki/Wikipedia:Citing_sourceshttp://en.wikipedia.org/wiki/List_of_SOA_related_products


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[edit] Literature

[edit] Books, non-technical

Allen, Paul (2006). Service Orientation, winning strategies and best practices.

Cambridge, UK: Cambridge University Press. ISBN 0521843367. Bloomberg, Jason; Ronald Schmelzer (2006). Service Orient or Be Doomed! How

Service Orientation Will Change Your Business. Hoboken, New Yersey: WILEY.ISBN 0-13-187002-5.

[edit] Books, technical

Barry, Douglas K. (2003). Web Services and Service-Oriented Architectures: The

Savvy Manager's Guide. San Francisco: Morgan Kaufmann Publishers. ISBN 1-

55860-906-7.

Bieberstein, Norbert; Sanjay Bose, Marc Fiammante, Keith Jones, Rawn Shah(2006). Service-Oriented Architecture Compass - Business Value, Planning and

Enterprise Roadmap. Upper Saddle River: Pearson. ISBN 0-13-187002-5.

Erl, Thomas (2005). Service-Oriented Architecture: Concepts, Technology, and

Design. Upper Saddle River: Prentice Hall PTR. ISBN 0-13-185858-0. Erl, Thomas (2004). Service-Oriented Architecture: A Field Guide to Integrating

XML and Web Services. Upper Saddle River: Prentice Hall PTR. ISBN 0-13-

142898-5.

Hurwitz, Judith; Robin Bloor, Carol Baroudi, Marcia Kaufman (2006). Service

Oriented Architecture for Dummies. Hoboken: Wiley.ISBN 0-470-05435-2.

Krafzig, Dirk; Karl Banke, Dirk Slama (2004).Enterprise SOA Service Oriented

Architecture Best Practices. Upper Saddle River: Prentice Hall PTR.ISBN 0-13-

146575-9.

Linthicum, David (2003).Next Generation Application Integration: From Simple

Information to Web Services. New York: Addison-Wesley Professional.ISBN978-0201844566.

Marks, Eric; Mark Werrell (2003).Executives Guide to Web Services. Hoboken:

John Wiley & Sons. ISBN 978-0471768944.

Marks, Eric; Michael Bell (2006). -Service Oriented Architecture: A Planning

and Implementation Guide for Business and Technology. Hoboken: John Wiley &

Sons.ISBN 978-0471768944.

Newcomer, Eric; Lomow, Greg (2005). Understanding SOA with Web Services.

Addison Wesley. ISBN 0-321-18086-0.

Pulier, Eric; Hugh Taylor (2005). Understanding Enterprise SOA. Greenwich:

Manning Publications. ISBN 1-932394-59-1.

[edit] Articles/Papers, non-technical

Coenen, Alcedo (2006). SOA agility in practice(PDF). Via Nova Architectura.

Jones, Steve (2005). Toward an acceptable definition of service(PDF). IEEESoftware.
http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=15http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=16http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=16http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=16http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0521843367http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131870025http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=17http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=17http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=17http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=1558609067http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=1558609067http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131870025http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131858580http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131428985http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131428985http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0470054352http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0470054352http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131465759http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131465759http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131465759http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780201844566http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780201844566http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780201844566http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780471768944http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780471768944http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780471768944http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0321180860http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=1932394591http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=18http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=18http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=18http://85.92.145.253/~vianova/files/SOA_20agility_20in_20practice_1.pdfhttp://85.92.145.253/~vianova/files/SOA_20agility_20in_20practice_1.pdfhttp://doi.ieeecomputersociety.org/10.1109/MS.2005.80http://doi.ieeecomputersociety.org/10.1109/MS.2005.80http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=15http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=16http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0521843367http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131870025http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=17http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=1558609067http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=1558609067http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131870025http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131858580http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131428985http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131428985http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0470054352http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131465759http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0131465759http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780201844566http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780201844566http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780471768944http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=9780471768944http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=0321180860http://en.wikipedia.org/w/index.php?title=Special:Booksources&isbn=1932394591http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=18http://85.92.145.253/~vianova/files/SOA_20agility_20in_20practice_1.pdfhttp://doi.ieeecomputersociety.org/10.1109/MS.2005.80


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[edit] Articles/Papers, technical

Mittal, Kunal (2006). Requirements process for SOA projects, Part 1 of 3:Capturing requirements for an SOA application - Initial requirements to build out

your SOA (HTML). IBM Developerworks.

Shan, Tony; Hua, Winnie (2006). A Service-Oriented Solution Framework for

Internet Banking (PDF). International Journal of Web Services Research, Vol. 3,Issue 1, pp 29-48.

Shan, Tony; Hua, Winnie (2006). Solution Architecture for N-Tier Applications

(PDF). In Proc. of the 3rd IEEE International Conference on Services Computing(SCC 2006), pp. 349-356.

Wada, Hiroshi; Suzuki, Junichi (2006). A Model-Driven Development

Framework for Non-Functional Aspects in Service Oriented Grids(PDF). In Proc.of 2nd IEEE International Conference on Autonomic and Autonomous Systems

(ICAS 2006).

Wada, Hiroshi; Suzuki, Junichi (2006). A Service-Oriented Design Framework

for Secure Network Applications (PDF). In Proc. of the 30th IEEE International

Conference on Computer Software and Applications Conference (COMPSAC2006).

Wada, Hiroshi; Suzuki, Junichi (2006). Modeling Non-Functional Aspects inService Oriented Architecture (PDF). In Proc. of the 2006 IEEE International

Conference on Service Computing.

Bieber, Guy (2000). Programming Service Oriented Programming (HTML).Motorola.

[edit] Standards

SOA Reference Model Technical Committee, OASIS (2006). A Reference Model

for Service Oriented Architecture. (PDF). OASIS.

[edit] References

1. ^ An alternative view, particularly after initial deployments, is that SOAs

properly ought not dictate physical implementation, so the formal definitionshould not include "network." High performance SOAs may not be viable

deployed to distributed nodes on a network, and separate nodes for every (or

most) services could be prohibitively expensive.

2. ^ Channabasavaiah, Holley and Tuggle, Migrating to a service-orientedarchitecture,IBMDeveloperWorks, 16 Dec 2003

3. ^ http://opengroup.org/projects/soa/doc.tpl?gdid=106324. ^ SOA Reference Model definition5. ^ Christopher Koch A New Blueprint For The Enterprise, CIO Magazine, Mar 1

2005

6. ^ Yvonne BalzerImprove your SOA project plans,IBM, 16 July 20047. ^ Thomas Erl Serviceorientation.org - About the Principles, 2005-2006

8. ^ Zimmermann, Krogdahl and Gee, Elements of Service-Oriented Analysis and

Design,IBMDeveloperWorks, 02 Jun 2004
http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=19http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=19http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=19http://www-128.ibm.com/developerworks/architecture/library/ar-soareq/http://www-128.ibm.com/developerworks/architecture/library/ar-soareq/http://www-128.ibm.com/developerworks/architecture/library/ar-soareq/http://www.idea-group.com/articles/details.asp?id=5523http://www.idea-group.com/articles/details.asp?id=5523http://doi.ieeecomputersociety.org/10.1109/SCC.2006.99http://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://www.posa3.org/workshops/AdHocNetworking/presentations/GuyBieberSlides.ppt#604,1,Service-Orientedhttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=20http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=20http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=20http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=21http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-0http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-1http://www-128.ibm.com/developerworks/library/ws-migratesoa/http://www-128.ibm.com/developerworks/library/ws-migratesoa/http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-2http://opengroup.org/projects/soa/doc.tpl?gdid=10632http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-3http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-4http://www.cio.com/archive/030105/blueprint.htmlhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-5http://www-128.ibm.com/developerworks/webservices/library/ws-improvesoa/http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-6http://www.serviceorientation.org/p0.asphttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-7http://www.ibm.com/developerworks/library/ws-soad1/http://www.ibm.com/developerworks/library/ws-soad1/http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=19http://www-128.ibm.com/developerworks/architecture/library/ar-soareq/http://www-128.ibm.com/developerworks/architecture/library/ar-soareq/http://www-128.ibm.com/developerworks/architecture/library/ar-soareq/http://www.idea-group.com/articles/details.asp?id=5523http://www.idea-group.com/articles/details.asp?id=5523http://doi.ieeecomputersociety.org/10.1109/SCC.2006.99http://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://dssg.cs.umb.edu/projects/soa.htmlhttp://www.posa3.org/workshops/AdHocNetworking/presentations/GuyBieberSlides.ppt#604,1,Service-Orientedhttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=20http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=21http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-0http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-1http://www-128.ibm.com/developerworks/library/ws-migratesoa/http://www-128.ibm.com/developerworks/library/ws-migratesoa/http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-2http://opengroup.org/projects/soa/doc.tpl?gdid=10632http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-3http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-4http://www.cio.com/archive/030105/blueprint.htmlhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-5http://www-128.ibm.com/developerworks/webservices/library/ws-improvesoa/http://en.wikipedia.org/wiki/IBMhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-6http://www.serviceorientation.org/p0.asphttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-7http://www.ibm.com/developerworks/library/ws-soad1/http://www.ibm.com/developerworks/library/ws-soad1/http://en.wikipedia.org/wiki/IBM


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9. ^ Dion Hinchcliffe Is Web 2.0 The Global SOA?, SOA Web Services Journal, 28

October 2005

10. ^ Jason Bloomberg Mashups and SOBAs: Which is the Tail and Which is theDog?,Zapthink

11. ^ Paul Krill Make way for SOA 2.0,InfoWorld, May 17, 2006

12. ^ Yefim Natis & Roy Schulte Advanced SOA for Advanced Enterprise Projects,Gartner, July 13, 2006

13. ^ Sandra Rogers Patience GrasshopperIts a Learning Process,Business TrendsQuarterly, Q4, 2006

14. ^ Joe McKendrickAnti-SOA 2.0 petition nears 400,ZDNet.com, June 29, 2006

15. ^ Is There Real Business Value Behind the Hype of SOA?, Computerworld, June

19, 2006

[edit] See also

Big ball of mud anti-pattern

Business-driven development Comparison of business integration software

Enterprise application integration Enterprise Messaging System

Enterprise Integration Patterns

Enterprise service bus

Java Business Integration

Microsoft Connected Services Framework

Representational State Transfer

Semantic service oriented architecture

Service component architecture

Service-oriented analysis and design Search oriented architecture complementary pattern Service-Oriented Architecture Implementation Framework

Service Oriented Infrastructure

SOA Governance

[edit] External links

BPM & SOA Journal

OASIS: Reference Model for Service Oriented Architecture

SOA RQ The "Internet of Services": The Global SOA

SOA Practitioners' Guide

SOA Implementation Using Offshore partner

What is a SOA service?

UML Profile and Feature Model: Modeling Non-Functional Aspects in Service

Oriented Architecture

What Is SOA? - An Introduction to Service-Oriented Computing
http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-8http://web2.wsj2.com/is_web_20_the_global_soa.htmhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-9http://www.zapthink.com/report.html?id=ZAPFLASH-2006320http://www.zapthink.com/report.html?id=ZAPFLASH-2006320http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-10http://www.infoworld.com/article/06/05/17/78420_HNsoa20_1.htmlhttp://www.infoworld.com/article/06/05/17/78420_HNsoa20_1.htmlhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-11http://www.gartner.com/DisplayDocument?ref=g_search&id=493863http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-12http://btquarterly.com/?mc=patience-grasshopper&page=soa-viewresearchhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-13http://blogs.zdnet.com/service-oriented/?p=652http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-14http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9001155&source=NLT_ROI&nlid=44http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=22http://en.wikipedia.org/wiki/Big_ball_of_mudhttp://en.wikipedia.org/wiki/Anti-patternhttp://en.wikipedia.org/wiki/Business-driven_developmenthttp://en.wikipedia.org/wiki/Comparison_of_business_integration_softwarehttp://en.wikipedia.org/wiki/Enterprise_application_integrationhttp://en.wikipedia.org/wiki/Enterprise_Messaging_Systemhttp://en.wikipedia.org/wiki/Enterprise_Integration_Patternshttp://en.wikipedia.org/wiki/Enterprise_service_bushttp://en.wikipedia.org/wiki/Java_Business_Integrationhttp://en.wikipedia.org/wiki/Microsoft_Connected_Services_Frameworkhttp://en.wikipedia.org/wiki/Representational_State_Transferhttp://en.wikipedia.org/wiki/Semantic_service_oriented_architecturehttp://en.wikipedia.org/wiki/Service_component_architecturehttp://en.wikipedia.org/wiki/Service-oriented_analysis_and_designhttp://en.wikipedia.org/wiki/Search_oriented_architecturehttp://en.wikipedia.org/wiki/Service-oriented_architecture_implementation_frameworkhttp://en.wikipedia.org/wiki/Service_Oriented_Infrastructurehttp://en.wikipedia.org/wiki/SOA_Governancehttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=23http://www.bpmspot.com/http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://www.sun.com/products/soa/soa_methodology.pdfhttp://www.alexandria.unisg.ch/Publications/37270http://dev2dev.bea.com/pub/a/2006/09/soa-practitioners-guide.htmlhttp://www.thbs.com/pdfs/case_study_offshore_onshore.pdfhttp://www.digerateur.com/articles/whatIsAService.jsphttp://dssg.cs.umb.edu/projects/soahttp://dssg.cs.umb.edu/projects/soahttp://www.whatissoa.com/http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-8http://web2.wsj2.com/is_web_20_the_global_soa.htmhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-9http://www.zapthink.com/report.html?id=ZAPFLASH-2006320http://www.zapthink.com/report.html?id=ZAPFLASH-2006320http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-10http://www.infoworld.com/article/06/05/17/78420_HNsoa20_1.htmlhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-11http://www.gartner.com/DisplayDocument?ref=g_search&id=493863http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-12http://btquarterly.com/?mc=patience-grasshopper&page=soa-viewresearchhttp://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-13http://blogs.zdnet.com/service-oriented/?p=652http://en.wikipedia.org/wiki/Service-oriented_architecture#_ref-14http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9001155&source=NLT_ROI&nlid=44http://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=22http://en.wikipedia.org/wiki/Big_ball_of_mudhttp://en.wikipedia.org/wiki/Anti-patternhttp://en.wikipedia.org/wiki/Business-driven_developmenthttp://en.wikipedia.org/wiki/Comparison_of_business_integration_softwarehttp://en.wikipedia.org/wiki/Enterprise_application_integrationhttp://en.wikipedia.org/wiki/Enterprise_Messaging_Systemhttp://en.wikipedia.org/wiki/Enterprise_Integration_Patternshttp://en.wikipedia.org/wiki/Enterprise_service_bushttp://en.wikipedia.org/wiki/Java_Business_Integrationhttp://en.wikipedia.org/wiki/Microsoft_Connected_Services_Frameworkhttp://en.wikipedia.org/wiki/Representational_State_Transferhttp://en.wikipedia.org/wiki/Semantic_service_oriented_architecturehttp://en.wikipedia.org/wiki/Service_component_architecturehttp://en.wikipedia.org/wiki/Service-oriented_analysis_and_designhttp://en.wikipedia.org/wiki/Search_oriented_architecturehttp://en.wikipedia.org/wiki/Service-oriented_architecture_implementation_frameworkhttp://en.wikipedia.org/wiki/Service_Oriented_Infrastructurehttp://en.wikipedia.org/wiki/SOA_Governancehttp://en.wikipedia.org/w/index.php?title=Service-oriented_architecture&action=edit&section=23http://www.bpmspot.com/http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=soa-rmhttp://www.sun.com/products/soa/soa_methodology.pdfhttp://www.alexandria.unisg.ch/Publications/37270http://dev2dev.bea.com/pub/a/2006/09/soa-practitioners-guide.htmlhttp://www.thbs.com/pdfs/case_study_offshore_onshore.pdfhttp://www.digerateur.com/articles/whatIsAService.jsphttp://dssg.cs.umb.edu/projects/soahttp://dssg.cs.umb.edu/projects/soahttp://www.whatissoa.com/


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With permission from Prentice Hall, I was able to publish some of the books

introductory content on a modest network of Web sites (in exchange for posting book

cover images on Web page footers). The primary reason these sites exist is to provideconvenient on-line reference content for readers of the book series. It also helps us avoid

publishing redundant content in the books, so that each title remains focused on its

specialized subject matter.

WhatIsSOA.com essentially acts as the starting point for these sites by establishing some

fundamental terminology and providing specific coverage of the strategic goals andbenefits that collectively represent the modern-day vision of SOA and service-oriented

computing. The last set of pages provide further supplementary content that addresses

implementation technologies, processes, and other deliverables that are common in realworld SOA projects.

Although this site positions SOA within the service-oriented computing platform, it onlyhints at what it means for solution logic to be considered "service-oriented." That

particular topic deserves a study of its own, which is why I published

www.SOAPrinciples.com, a separate Web site dedicated to an exploration of service-orientation.

Note that this site and SOAPrinciples.com are further supplemented with two additionalsites: www.SOAMethodology.com provides a generic set of processes for service

delivery, analysis, and design, and www.SOAGlossary.comis a master glossary

established in support of the series books. If youd like to be notified of changes to thesesites and other events related to this book series and the associated SOA Magazine, send

a blank e-mail to: [email protected]

Services (Part I)

Services (Part II)

The Service-Orientation

Design Paradigm

Origins and Iluencesof Service-Orientation

(Part I)Origins and Influencesof Service-Orientation

(Part II)

Service-Orientation

Design Principles

Standardized Service

The key to getting the most out of SOA lies within the

knowledge of how to create "truly" service-oriented solutionlogic. That knowledge has been documented as part of the

service-orientation design paradigm. As with object-orientation,

service-orientation represents a distinct approach to designing

solution logic in support of a very specific set of goals.

by

Thomas Erl

This site introduces the design principles that comprise the service-orientation

design paradigm and further explores various aspects and effects of applyingservice-orientation in the real world. Becoming proficient with the conceptsand principles of service-orientation equips you with an understanding of what

is and is not considered "service-oriented" within the world of solution design.

This understanding leads to a clear comprehension of how to shape solutionlogic specifically in support of thestrategic goals and benefits associated with

SOA and service-oriented computing.

Furthermore, this comprehension provides you with a great deal of clarity
http://www.soaprinciples.com/http://www.soamethodology.com/http://www.soaglossary.com/http://www.soaglossary.com/http://www.soamag.com/http://www.soamag.com/http://www.soaprinciples.com/p1.asphttp://www.soaprinciples.com/p2.asphttp://www.soaprinciples.com/p3.asphttp://www.soaprinciples.com/p3.asphttp://www.soaprinciples.com/p3.asphttp://www.soaprinciples.com/p4.asphttp://www.soaprinciples.com/p4.asphttp://www.soaprinciples.com/p4.asphttp://www.soaprinciples.com/p5.asphttp://www.soaprinciples.com/p5.asphttp://www.soaprinciples.com/p5.asphttp://www.soaprinciples.com/p6.asphttp://www.thomaserl.com/http://www.thomaserl.com/http://www.whatissoa.com/p16.asphttp://www.whatissoa.com/p16.asphttp://www.thomaserl.com/http://www.soaprinciples.com/default.asphttp://www.soaprinciples.com/http://www.soamethodology.com/http://www.soaglossary.com/http://www.soamag.com/http://www.soaprinciples.com/p1.asphttp://www.soaprinciples.com/p2.asphttp://www.soaprinciples.com/p3.asphttp://www.soaprinciples.com/p3.asphttp://www.soaprinciples.com/p3.asphttp://www.soaprinciples.com/p4.asphttp://www.soaprinciples.com/p4.asphttp://www.soaprinciples.com/p4.asphttp://www.soaprinciples.com/p5.asphttp://www.soaprinciples.com/p5.asphttp://www.soaprinciples.com/p5.asphttp://www.soaprinciples.com/p6.asphttp://www.thomaserl.com/http://www.thomaserl.com/http://www.whatissoa.com/p16.asp


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Contracts

Service Loose

CouplingService Abstraction

Service Reusability

Service AutonomyService StatelessnessService

Discoverability

Service ComposabilityService-Orientation

and Interoperability

Effects of Service-

Orientation on the

Enterprise

Service-Orientationand the Concept of

"Application"

Service-Orientationand the Concept of

"Integration"

The Service

Composition

Service-Orientation

in the Real World

Life BeforeService-Orientation

(Part I)Life Before

Service-Orientation

(Part II)

The Need forService-Orientation

(Part I)

The Need forService-Orientation

(Part II)Challenges Introducedby Service-Orientation

(Part I)

Challenges Introduced

by Service-Orientation(Part II)

Additional

when surveying the current SOA marketplace. It allows you to see past the

(sometimes questionable) "SOA" branding used to market products and

professional services, and enables you to assess which of the availabletechnologies, features, and resources are truly compatible with your business

requirements and with how you plan to position SOA and build service-

oriented solutions within your organization.The criteria for this type of assessment no longer is whether something claimsto provide SOA support, but whether its actual features will help you realize

the desired level of service-orientation within your solution designs. With such

a clear perspective, you may discover that some of the most suitable productsand technologies for building service-oriented solutions may not be branded

with "SOA" at all.

The content on this site originated from an introductory chapter I wrote for mythird SOA book for thePrentice Hall Service-Oriented Computing Series from

Thomas Erl. This book, entitled SOA: Principles of Service Design, essentially

provides an in-depth exploration of the service-orientation design paradigm,

and has a separate chapter dedicated to each of its eight design principles. Thepurpose of this site is to supply introductory content about service-orientation

for on-line reference purposes for readers of this book series. Publishin

impact of soa on it industry

Documents