Service Data Objects: Difference between revisions

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{{Short description|Java library}}{{distinguish|text=the [[CANopen]] protocol of the [[CANopen#Service_Data_Object_(SDO)_protocol|same name]]}}

'''Service Data Objects''' is a technology that allows heterogenous data to be accessed in a uniform way. The SDO specification was originally developed in 2004 as a joint collaboration between [[BEA]] and [[IBM]] and approved by the Java Community Process. Version 2.0 of the specification was introduced in November 2005 as key part of the Service Component Architecture.

'''Service Data Objects''' is a technology that allows heterogenous[[heterogeneous]] data to be accessed in a uniform way. The SDO specification was originally developed in 2004 as a joint collaboration between [[Oracle Corporation|Oracle]] ([[BEA Systems|BEA]]) and [[IBM]] and approved by the [[Java Community Process]] in [http://www.jcp.org/en/jsr/detail?id=235 JSR 235]. Version 2.0 of the specification was introduced in November 2005 as a key part of the [[Service component architecture | Service Component Architecture]].

The specification is now being developed by:

* [[BEA]]

* [[IBM]]

* [[Rogue Wave (company)]]

* [[Oracle Corporation|Oracle]]

* [[SAP]]

* [[Siebel]]

* [[Sybase]]

* [[XCalia]]

* [[Software AG]]

* [[Sun Microsystems]]

==Relation to other technologies==

Originally, the technology was known as '''Web Data Objects''', or WDO, and was shipped in [[IBM WebSphere Application Server]] 5.1 and [[IBM WebSphere Studio Application Developer]] 5.1.2.<ref>{{Cite web |title=Introduction to Service Data Objects |website=[[IBM]] |url=http://www.ibm.com/developerworks/java/library/j-sdo/ |url-status=dead |archive-url=https://web.archive.org/web/20210306022253/http://www.ibm.com/developerworks/java/library/j-sdo/ |archive-date=6 March 2021}}</ref> Other similar technologies are [[Java Data Objects|JDO]], [[Eclipse Modeling Framework|EMF]], [[JAXB]] and [[ADO.NET]].

==Design==

Service Data Objects denote the use of [[language-independent specification|language-agnostic]] data structures that facilitate communication between structural tiers and various service-providing entities. They require the use of a [[tree structure]] with a [[root node]] and provide traversal mechanisms (breadth/depth-first) that allow client programs to navigate the elements. Objects can be static (fixed number of fields) or dynamic with a map-like structure allowing for unlimited fields. The specification defines [[meta-data]] for all fields and each object graph can also be provided with change summaries that can allow receiving programs to act more efficiently on them.

==Developers==

The specification is now being developed by [[IBM]], [[Rogue Wave (company)|Rogue Wave]], [[Oracle Corporation|Oracle]], [[SAP AG|SAP]], [[Siebel]], [[Sybase]], [[Xcalia]], [[Software AG]] within the [[OASIS (organization)|OASIS]] Member Section Open CSA<ref>[http://www.oasis-opencsa.org/ Activities and announcements | OASIS Open CSA<!-- Bot generated title -->]</ref> since April 2007. Collaborative work and materials remain on the collaboration platform of Open SOA,<ref>[http://www.osoa.org Home – Open SOA Collaboration<!-- Bot generated title -->]</ref> an informal group of actors of the industry.

==Implementations==

The following SDO products are available:

* Rogue Wave Software (HydraSDO)

* CodeFutures[[Rogue Wave Software]] (FireStorm/SDO)HydraSDO

* Xcalia Software (XICfor Java and .Net)

* [[Oracle Corporation|Oracle]] (Data Service Integrator) <ref>[http://www.oracle.com/technetwork/middleware/data-service-integrator/overview/index.html | Oracle Data Service Integrator]</ref>

* BEA (ADSP)

* IBM (Virtual XML Garden)

* IBM ([[WebSphere Process Server]])

There are open source implementations of SDO from:

* The Eclipse Persistence Services Project ([[EclipseLink]])

* The [http://incubator.apache.org/tuscany/ Apache Tuscany] project for Java and C++

* The [http://pecl.php.net/sdo/[Apache SDOTuscany]] project for PHP]Java projectand C++

* The fcl-sdo library included with [[FreePascal]]

==References==

{{reflist}}

* [http://www.ibm.com/developerworks/library/specification/ws-sdo/ SDO Specifications]

* [http://www.ibm.com/developerworks/java/library/j-sdo/ IBM Introduction to Service Data Objects]

==External links==

* [http://www.codefutures.com/service-data-object/ CodeFutures Introduction to Service Data Objects]

Specification versions and history can be found on

* [http://www.zend.com/pecl/tutorials/sdo.php Introducing Service Data Objects for PHP]

* Latest materials at [http://www.oasis-opencsa.org/sdo OASIS Open CSA]

{{Compu-network-stub}}

* [http://www.ibmosoa.comorg/developerworksdisplay/javaMain/library/j-sdo/ IBM Introduction toService+Data+Objects+Home Service Data Objects]

* [http://www.osoa.org/display/Main/Service+Data+Objects+Specifications SDO Specifications at OpenSOA]

* [https://web.archive.org/web/20090205171448/http://devzone.zend.com/article/1085-Introducing-Service-Data-Objects-for-PHP Introducing Service Data Objects for PHP]

* [http://www.ibm.com/developerworks/web/library/specification/ws-sdosoa-scasdo/index.html Using PHP's SDO Specificationsand SCA extensions]

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