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CORBA AND SOAP

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  1. CORBA AND SOAP Unmesh Kulkarni i2 Group Ashish V. Tendulkar Directory Database integration group (www.eusersolutions.com) Persistent Systems Pvt. Ltd. Pune (www.pspl.co.in)

  2. OUTLINE • Introduction to middleware • CORBA Concepts • Problem Domain • SOAP • Synergies • Conclusion

  3. What is Middleware? • Glue for Components • Sits Between OS and Applications • Distributed Object Services • CORBA, COM, DCE, Java/RMI … • XML?

  4. CORBA - Objectives • OS Independence • Language Independence • Remote Methods • Static/Dynamic Invocations • Distributed Services

  5. Interoperability Standardization of – • Binary Formats : in-memory • API’s : Programming Support • IDL, Type Libraries, File Formats • Data Representation – CDR/NDR • Transfer Protocol

  6. The PRO’s : IDL Stub-skeleton generators Services API’s CDR IIOP And The CON’s Complexity Vendor dependency Costly - large volumes Behavior marshalling Internet / Firewalls COM-CORBA Inter-operability CORBA provides..

  7. The problem.. Proxy Server Server Client App. Application Server Firewall

  8. Implications • Industry not shifted completely to either one • Vendor specific • Lack of interoperability • Require high-tech runtime environment

  9. Why XML? • Simple text markup language • Platform, language and vendor agnostic • Easily extensible • Capable of solving interoperability problem

  10. Why HTTP? • Ubiquitous • Supported by every web browser and server • Effective technology for transferring text, graphics and other information

  11. XML + HTTP = SOAP • HTTP is used for transport • XML as encoding scheme • Endpoint HTTP based URL for the target • Object mapping: implementation specific

  12. SOAP call anatomy

  13. HTTP Headers SOAP method name SOAP Envelope SOAP Header SOAP Body SOAP Component Object Endpoint ID Method/Interface ID Extension Headers Parameter Data Call element

  14. Uses of SOAP • SOAP greatly simplifies data exchange in B2B application over extranet • Enables web site to integrate services from other sites • Remote scripting more prevalent with SOAP • Non-browser client could seamlessly access a service across web

  15. Example Message POST /string_server/Object17 HTTP/1.1 Host: 209.110.197.2 Content-Type: text/xml Content-Length: 152 SOAPMethodName: urn:strings-com:IString#reverse <Envelope> <Body> <m:reverse xmlns:m='urn:strings-com:IString'> <theString>Hello, World</theString> </m:reverse> </Body> </Envelope>

  16. Example Response 200 OK Content-Type: text/xml Content-Length: 162 <Envelope> <Body> <m:reverseResponse xmlns:m='urn:strings- com:IString'> <result>dlroW ,olleH</result> </m:reverseResponse> </Body> </Envelope>

  17. IOR : Object Reference Interface Name /Method Name Method Invocation with Parameters POST/ObjectURI HTTP/1.1 SOAP:MethodName SOAP:Envelope SOAP:Header SOAP:Body SOAP:CallElement CORBA vs SOAP

  18. Advantages • Simplest Data Representation • Hardware/Language Neutral • No Vendor Dependencies • Simple and Human-readable • Typing Flexibility • Firewall Issues

  19. Then Why Not XML? • Distribution Support • Resource location, control and management • Services – Transactions, Events, Security etc. • Error Handling • Non-text data • Quality of Service – Reliability • Efficiency (Redundancy Elimination)

  20. XML With CORBA • XML – Structure • CORBA – Infrastructure • XMI – Metadata Interchange • XML Interfaces – Components accepting/emitting XML documents

  21. XML With CORBA…. Examples : • XMI – Exchange of UML models between Design tools and repositories • Persistent storage of components in IDE’s: • JavaBean Persistence • Resilience to versioning of libraries/VM’s • Defaults/Redundancy elimination

  22. Synergy

  23. Conclusion • SOAP is platform independent, language neutral protocol • SOAP does not replace COM and CORBA • SOAP works in place of DCOM and IIOP • SOAP does not pose huge security risks • Supports interoperation between different vendor specific implementations

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