Web Services: UDDI

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Web Services UDDI
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What is UDDI?

• UDDI The Universal Description, Discovery,
  and Integration
• A central element of the group of standards that
  comprise the Web services stack

A platform-independent, XML-based registry for
businesses worldwide to list themselves on the
Internet
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UDDI Basics

• UDDI is a specification for creating a registry
  service that catalogs organizations and their Web
  services
• An implementation of the UDDI specification is
  called a UDDI registry
• UDDI enables a business to
• Describe its business and its services
• Discover other businesses that offer desired
  services
• Integrate with these other businesses

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UDDI Registry

• A UDDI registry is a database that supports a set
  of standard data structures defined by the UDDI
  specification
• Most UDDI products run on a relational DBMS
• Can be implemented using other technologies,
  including LDAP servers and XML databases
• UDDI products are offered by a number of vendors,
  including IBM, Microsoft, Sun, Oracle, Fujitsu,
  Systinet

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Registry Data

• A UDDI business registration consists of three
  components
• White Pages address, contact, and known
  identifiers
• Yellow Pages industrial categorizations based
  on standard taxonomies
• Green Pages technical information about
  services exposed by the business

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Brief History

• Originally developed by Microsoft, IBM, and Ariba
  in 2000
• Later UDDI.org was formed, 12 other companies
  invited to participate
• At first attention was focused on the "UDDI
  Business Registry - a public implementation of
  the UDDI standard
• Now supported by OASIS

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Versions

• UDDI 1.0 (2000)
• Foundation for registry of Internet based
  business services
• UDDI 2.0 (2001)
• Align specification with emerging Web services
  standards and provide flexible service taxonomy
• UDDI 3.0 (2004)
• Support secure interaction of private and public
  implementations as major element of
  service-oriented infrastructure

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Private and Public Registries

• Anyone can set up a UDDI registry for private use
  within an organization or market place
• In addition, there was a massive public UDDI
  registry called the UDDI Business Registry, which
  was run jointly by IBM, Microsoft, NTT, and SAP
• Companies announced they were closing their
  public UDDI nodes in January 2006
• However, companies continue to support private
  registries in their products

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The Self-Organizing Myth

• At first, the concept of self-organizing systems
  was high on the list of motivations for creating
  the registry standard
• Idea - applications look up Web services and
  integrate with them automatically, without any
  human intervention
• Sounded pretty good, but in reality doesn't work!
• The high level of artificial intelligence is
  required to make the heuristic decisions

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Key Functional Concepts

• UDDI describes a registry of Web services and
  programmatic interfaces for publishing,
  retrieving, and managing information about
  services
• Describes about 30 different SOAP operations that
  allow to add, update, delete, and find
  information contained in a UDDI registry
• UDDI itself is of set a Web services!

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The UDDI Data Model

• The core information model used by a UDDI
  registry is defined in several XML schemas
• XML was chosen because
• it offers a platform-neutral view of data
• allows hierarchical relationships to be described
  in a natural way
• XSD was chosen because of its
• support for rich data types
• ability to easily describe and validate
  information based on models represented in schemas

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Data Model Types

• 1. businessEntity
• Business or organization that provides the Web
  service
• 2. businessService
• Web service or some other electronic service
• 3. BindingTemplate
• Technical details to invoke Web services
• 4. tModel
• Technical fingerprints used to access service
  specifications

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Data Model Types (cont.)

• 5. publisherAssertion
• Show relationship between business Entities

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UDDI Programming API

• UDDI accessing operations use SOAP messages

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UDDI Programming API

• UDDI's standard Web services are divided into two
  WSDL/SOAP-based APIs
• The Inquiry API
• The Publishing API
• All UDDI Inquiry and Publishing operations use
  Document/Literal SOAP messages and all of them
  are Request/Response

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Inquiry API

• Find things
• find_business
• find_service
• find_binding
• find_tModel
• Get details about things
• get_businessDetail
• get_serviceDetail
• get_bindingDetail
• get_tModelDetail

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Publishing API

• Save things
• save_business
• save_service
• save_binding
• save_tModel
• Delete things
• delete_business
• delete_service
• delete_binding
• delete_tModel

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Example Searching

• To search for a company, say Microsoft, we would
  create a query within a SOAP envelope
• ltfind_business generic"1.0" xmlns"urnuddi-orga
  pi"gt    ltnamegtMicrosoftlt/namegt
• lt/find_businessgt

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Example Response (1-3)

• ltbusinessList generic"1.0"
• operator"Microsoft Corporation"
• truncated"false"
• xmlns"urnuddi-orgapi"gt
• ltbusinessInfosgt
• ltbusinessInfo
• businessKey"0076B468-EB27-42E5-AC09-9955CF
  F462A3"gt
• ltnamegtMicrosoft Corporationlt/namegt
• ltdescription xmllang"en"gt
• Empowering people through great software
  -
• any time, any place and on any device is
  Microsoft's
• vision. As the worldwide leader in
  software for personal
• and business computing, we strive to
  produce innovative
• products and services that meet our
  customer's
• lt/descriptiongt

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Example Response (2-3)

• ltserviceInfosgt
• ltserviceInfo
• businessKey"0076B468-EB27-42E5-AC09-995
  5CFF462A3"
• serviceKey"1FFE1F71-2AF3-45FB-B788-09AF
  7FF151A4"gt
• ltnamegtWeb services for smart
  searchinglt/namegt
• lt/serviceInfogt
• ltserviceInfo
• businessKey"0076B468-EB27-42E5-AC09-995
  5CFF462A3"
• serviceKey"8BF2F51F-8ED4-43FE-B665-38D8
  205D1333"gt
• ltnamegtElectronic Business Integration
  Serviceslt/namegt
• lt/serviceInfogt
• ltserviceInfo
• businessKey"0076B468-EB27-42E5-AC09-995
  5CFF462A3"
• serviceKey"611C5867-384E-4FFD-B49C-28F9
  3A7B4F9B"gt
• ltnamegtVolume Licensing Select Programlt/namegt
  
• lt/serviceInfogt

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Example Response (3-3)

• ltserviceInfo
• businessKey"0076B468-EB27-42E5-AC09-995
  5CFF462A3"
• serviceKey"A8E4999A-21A3-47FA-802E-EE50
  A88B266F"gt
• ltnamegtUDDI Web Siteslt/namegt
• lt/serviceInfogt
• lt/serviceInfosgt
• lt/businessInfogt
• lt/businessInfosgt
• lt/businessListgt

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Java API for XML Registries

• JAXR provides a uniform and standard Java API for
  accessing various kinds of XML registries
• Gives developers the
• ability to write
• registry client
• programs that are
• portable across
• various target
• registries

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UDDI4j

• UDDI4J is a Java class library that provides an
  API to interact with a UDDI registry
• Project is licensed under the IBM Public License.
• Project is hosted by SourceForge.net
  http//sourceforge.net/projects/uddi4j/

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UDDI Server Implementations

• There are various UDDI servers
• Apache jUDDI Open-Source UDDI Server
• Oracle Service Registry
• Microsoft Enterprise UDDI Services Part of
  Windows Server 2003
• BEA Aqualogic Service Registry
• Systinet Registry

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References

• Introduction to UDDI Important Features and
  Functional Concepts
• http//www.oasis-open.org/committees/download.php
  /9861/UDDI20Technical20White20Paper20(Final).p
  df
• Universal Description, Discovery and Integration
  (UDDI) project
• http//www.uddi.org/
• Java Specification Request (JSR) 93 JAXR 1.0
• http//jcp.org/jsr/detail/093.jsp
• Microsoft UBR Shutdown FAQ
• http//uddi.microsoft.com/about/FAQshutdown.htm