CORBACommon Object Request Broker Architecture

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CORBA-Common Object Request Broker Architecture

• PRESENTED BY
• MEENU SUNDARAM
• August 9th 2002

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1. Motivation2. Introduction to
CORBA.3.Purpose of CORBA in V-LAB.4.CORBA and
its Competitors.5.Future Work.
CORBA Common Object Request Broker Architecture
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Motivation

• Simplifies Application Networking
• Provides foundation for high level distribution
  Object Collaboration
• Benefits for distributed objects similar to OO
  languages for non distributed programming.
• Platform Independent.

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Introduction to CORBA

• Vendor-Independent Architecture and
  Infrastructure that computer applications work
  over the network.
• Example Shopping Cart in E-Commerce
• Shopping cart has many object instances,each
  assigned to a new customer.
• Define OMG IDL Interface ( part of the contract
  that the server object offers to the clients).
• Any client that wants to invoke an operation on
  the object must use this IDL interface
• Specify the operation it wants to perform, and
  to marshal the arguments that it sends.
• Unmarshal the arguments at the server end. 

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Introduction to CORBA

• - Clients use the object references to direct
  their invocations, identifying to the ORB the
  exact instance they want to invoke

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Introduction to CORBA

• Interoperability of one ORB with the other.

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Purpose of CORBA in V-LAB

• CORBA solves the problem of how to use the
  network to connect different portions of a
  simulation together.

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CORBA and its Competitors

• Sockets vs. CORBA
• -Sockets do not offer reliable communication
• -No Parameter marshalling
• - No Interface Descriptions
• DCOM(Distributed Common Object Model) vs. CORBA
• -DCOM does not support all Java platforms,
  only supports Java VM for Windows 95 and Windows
  NT.
• RMI(Remote Method Invocation) vs. CORBA
• - RMI is very attractive and has all the
  features programmers need .
• - Only drawback being that it is Java based,
  and is not galactic as CORBA.

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CORBA and its Competitors

• Servlets vs. CORBA
• - Does not provide marshaling and
  unmarshaling of parameters
• - Does not support typed interfaces.
• CGI (Common Gateway Interface) vs. CORBA
• - Clumsy
• - Stateless
• - Extremely Slow

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Future Work

• Integrate CORBA into DEVS.
• Work on the DEVS-CORBA sample software.