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XML A Middleware Mechanism?. Contents Middleware - CORBA Interoperabilty Requirements What Does Middleware Provide? XML for Component Integration Advantages and Disadvantages Synergies. What is Middleware?. Glue for Components Sits Between OS and Applications

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Xml a middleware mechanism
XML A Middleware Mechanism?

Contents

  • Middleware - CORBA

  • Interoperabilty Requirements

  • What Does Middleware Provide?

  • XML for Component Integration

  • Advantages and Disadvantages

  • Synergies


What is middleware
What is Middleware?

  • Glue for Components

  • Sits Between OS and Applications

  • Distributed Object Services

  • CORBA, COM, DCE, Java/RMI …

  • XML?


Corba objectives
CORBA - Objectives

  • OS Independence

  • Language Independence

  • Remote Methods

  • Static/Dynamic Invocations

  • Distributed Services


Interoperability requirements
Interoperability Requirements

Standardization of –

  • Binary Formats : in-memory

  • API’s : Programming Support

  • IDL, Type Libraries, File Formats

  • Data Representation – CDR/NDR

  • Transfer Protocol


What does corba provide

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?


How can xml do it
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!


Advantages
Advantages

  • Simplest Data Representation

  • Hardware/Language/Vendor Neutral

  • Simple and Human-readable

  • Typing Flexibility

  • Firewall Issues


Advantages1
Advantages….

  • Extensible

    • Domain Standards

    • Namespaces

    • Gateways

    • XML Transforms

      Services will be available…


Then why not xml
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


Xml with corba
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.


Conclusion
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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