Collaborative Point of View Document Centric SOA Jeremy Deane, Technical Architect, [email protected], October 2007TABLE OF CONTENTS LIST OF FIGURES
Remote Procedure Call vs. Document-Literal
Collaborative Point of View 1. Document Centric SOA Figure 1 Remote Procedure Call vs. Document-Literal 1.1 Background HTTP Request or Response HTTP Request or Response HTTP HEADERS HTTP HEADERS
an approach for building softwareservices, regardless of location orownership, that map directly to
HTTP Body HTTP Body SOAP Envelope SOAP Envelope SOAP HEADERS SOAP HEADERS SOAP Body SOAP Body
ever-changing business requirements. RPC Parameters XML Document
For instance, a new service can becomposed of existing services,creating a new business process, orcan simply delegate to anotherservice, extending a business process. SOAP- RPC SOAP- XML
implemented services based onSimple Object Access Protocol(SOAP) and remote procedure calls
1.2 Exchanging Business Documents Collaborative Point of View Figure 2 Document Centric Services <<artifact>> <<artifact>> Linux Server <<document>> <<execution environment>> Municipal Web Application Client Laptop Linux Server Registration Recycling Bill <<execution environment>> <<execution environment>> Municipal Web Application Registration Web Service XML Web Service From Data Registration Registration Recycling Registration Registration Unix Server Recycling <<execution environment>> Waste Mgmt. Application <<document>> Management <<artifact>> <<artifact>> <<artifact>> Web Service 1.3 Service Implementation Options
resource, identified by a unique ID.
registering to vote is an activity whilesubmitting a voter registrationdocument is updating a resource. 2Representational State Transfer (REST) originated from Roy Thomas Fielding's PhD DissertationCollaborative Point of View Figure 3 SOAP vs. REST
The most common resourcerepresentation format is an XML
HTTP Request or Response HTTP Request or Response
document, optionally defined by anXSD. A resource representation often
HTTP HEADERS HTTP HEADERS
contains not just data but links toother resources as well. The resource
HTTP Body HTTP Body SOAP Envelope SOAP HEADERS XML Document SOAP Body XML Document
each service request results in anupdated application state, a specificresource’s state only changes in thecase of a PUT, POST or DELETE.
The Request and Response messagesimplement a standard format that
SOAP- XML REST - XML
includes a header and a body. Sincethe RESTful services are stateless, thesecurity information must be passedin each request. To secure a request,
services is to use a RESTful approach. 1.4 RESTful Document Centric Services
Resource Indicator (URI), over HTTP3.
steps, toolkits and execution engines. 3A RESTful service can also be invoked asynchronously using the Request-Reply Integration PatternCollaborative Point of View Figure 4 RESTFul Document Centric Service <<document>> Linux Server <<execution environment>> <<execution environment>> Web Server HTTP GET Request HTTP Response: 200 (OK) <<document>> 1.5 Service Provisioning
regardless of transport is addressing. Collaborative Point of View Figure 5 NetKernel Enterprise Service Bus Unix Server <<document>> <<execution environment>> Linux Server Demilitarized Application Server HTTP GET Request <<execution environment>> Apache Web Server Application HTTP Response: 200 (OK) Security Filtering <<document>> Route and Transform Document Linux Server <<execution environment>> NetKernel <<document>> <<document>>
sends the file onto the Oracledatabase using FTP.
Linux Server Linux Server 1.6 Service Governance <<execution environment>> <<execution environment>> Oracle Database PeopleSoft Benefits
provides an accountability framework. Warehouse Application
Service accountability is requiredsince a service may span lines ofbusiness or several organizations. Governance ensures that services arenot overused, or worse misused, byenforcing policies and maintaining
4Actional SOA Management Product SuiteCollaborative Point of View Figure 6 Actional Business Process Visibility 1.7 Summary
A Document Centric SOA consists ofreusable services exchanging businessdocuments. Using schemas to definethe contents of the documentscreates an enterprise domain modelindependent of a platform orapplication. An enterprise domainmodel provides an organization witharchitectural agility since integratedsystems do not rely on each other’smessage structure or data types. Thusthe replacement of a system ofrecord, such as legacy application,may require an update to the ESB butwill have little or no impact on theconsuming applications.
Using a RESTful approach toimplement document-centric serviceslowers the initial cost of entry andincreases the time to market. REST ispreferred over SOAP because REST isbased on the stable principles of theweb rather than a set of everchanging vendor-driven specifications. Collaborative Point of View 2. References Service Oriented Architecture • OASIS SOA Reference Architecture http://www.oasisopen.org/committees/download.php/19679/soa-rm-cs.pdf
• Service-Oriented Architecture: Concepts, Technology, and Design by Thomas Erl
http://www.soabooks.com/chapters2.asphttp://1060.org/upload/IntroductionToResourceOrientedComputing-1.pdf
• Understanding Enterprise Service Bus Part I-III by Rick Robinson
http://www-128.ibm.com/developerworks/webservices/library/ws-esbscen/
• Understanding SOA Governance by Lori MacVittie
http://www.networkcomputing.com/showArticle.jhtml?articleID=191203018&queryText=centrasiteWeb Services • W3C Web Services Architecture
• Web Services: Concepts, Architectures and Applications by Alonso, Casati, Kuno & Machiraju
http://www.inf.ethz.ch/personal/alonso/WebServicesBook
• Web Services Interoperability Organization
• Resource-oriented vs. activity-oriented Web services by James Snell
http://www-128.ibm.com/developerworks/xml/library/ws-restvsoap/
• RESTful Web Services by Leonard Richardson, Sam Ruby
http://www.oreilly.com/catalog/9780596529260/Extensible Markup Language (XML) • Extensible Markup Language (XML)
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Viagra mag zich nog steeds in een ongekende populariteit verheugen. Zowel de legale verkoop als de illegale verkoop via het Internet lopen als een trein en het is dan ook geen wonder dat het gilde der kruidenkwaks alle moeite doet om zijn positie op de 'potentiemarkt' te versterken en als dat niet lukt, in ieder geval te consolideren. Om dat doel te bereiken worden geen middelen geschuwd. dagb
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