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Understanding Middleware: XML and CORBA for Component Integration

This document explores the concept of middleware, focusing on the integration capabilities provided by XML and CORBA. It discusses interoperability requirements, the benefits and drawbacks of middleware solutions, and the synergies between them. Key aspects covered include the architecture's role as a glue for components, various distributed object services, and how XML enhances integration through standardized tags and flexible data representation. In conclusion, we compare XML and CORBA to guide choices for complex enterprise applications versus lightweight integrations.

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Understanding Middleware: XML and CORBA for Component Integration

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  1. XML A Middleware Mechanism? Contents • Middleware - CORBA • Interoperabilty Requirements • What Does Middleware Provide? • XML for Component Integration • Advantages and Disadvantages • Synergies

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

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

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

  5. The PRO’s : IDL Stub-skeleton generators Services API’s CDR IIOP And The CON’s Complex Versioning Costly for large volumes Behavior mashalling What Does CORBA Provide?

  6. How can XML do it? • Standardized Tags for Request/Response • Parsers and DTD’s • HTTP / SMTP • E.g. XML-RPC, SOAP • A Geek’s Pleasure!

  7. Advantages • Simplest Data Representation • Hardware/Language/Vendor Neutral • Simple and Human-readable • Typing Flexibility • Firewall Issues

  8. Advantages…. • Extensible • Domain Standards • Namespaces • Gateways • XML Transforms Services will be available…

  9. 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

  10. XML With CORBA • XML – Structure • CORBA – Infrastructure • XML – Metadata Interchange • XML Interfaces – Components accepting/emitting XML documents • E.g. Exchange of UML Models Between Design Tools.

  11. Conclusion • XML : • Structured Documents • On-the-fly Documents • Light-weight Applications • Stateless Transactions • Archiving • CORBA : better suited for complex enterprise applications.

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