CORBA

1
CORBA Common Object Request Broker Architecture
2
The CORBA Group

• Technique Hui Chen, Devanand Jamisetti, Kang
  Sun, Zhijun Lu
• Methodology Derrel Blain, A. Chiluka
• CMMI Senhua Yu, Keshav

3
The Technique
4
Topic I Technical Overview

• Why CORBA
• The Problem
• The Solution (What is CORBA)
• The Architecture Overview
• The Methodology Overview

5
Topic II The Components

• OMG IDL
• ORB, Client Side
• ORB, Server Side
• ORB, Object Implementation Side
• CORBA Interoperability

6
Topic III Language Mappings

• Language Mappings, Part 1 C
• Language Mappings, Part 2 Java

7
Topic IV An example
8
Simplest Example for CORBA

• CORBA group
• Presented by Kang Sun

9
Programming in CORBA with ORBacus

• A simple Hello world!
• Hello.idl
• interface Hello
• void hello()
• IDL Compiler generates
• Hello.h (is used to create client side code)
• Hello.cpp
• Hello_skel.h(is used to create server side
  code)
• Hello_skel.cpp

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Implementing the Server (1)

• Hello_impl.h
• include ltHello_skel.hgt
• class Hello_impl public Hello_skel
• public virtual void hello()

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Implementing the Server (2)

• Hello_impl.cpp
• include ltOB/CORBA.hgt
• include ltHello_impl.hgt
• Void Hello_implhello()
• cout ltlt Hello World! ltlt endl

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Implementing the Server (3)

• Server.cpp (server main program)
• int main(int argc, char argv, char)
• CORBA_ORB_var orb CORBA_ORB_init(argc, argv)
• CORBA_BOA_var boa orb -gt BOA_init(argc, argv)
• Hello_var p new Hello_impl
• CORBA_String_var s orb -gt object_to_string(p)
• const char refFile "Hello.ref"
• ofstream out(refFile)
• out ltlt s ltlt endl
• out.close()
• boa -gt impl_is_ready(CORBA_ImplementationDef_nil
  ())

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Implementing the Client (1)

• Client.cpp
• int main()
• CORBA_ORB_var orb CORBA_ORB_init(argc, argv)
• const char refFile Hello.ref
• ifstream in
• in.open(refFile)
• char s1000
• in gtgt s
• CORBA_Object_var obj orb -gt string_to_object(s)
  
• Hello_var hello Hello_narrow(obj)

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Implementing the Client (2)

• cout ltlt Enter h for hello or x for exit\n
• char c
• do
• cout ltlt gt
• cin gtgt c
• if(c h)
• hello -gt hello()
• while(c ! x)

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References

• ORBacus http//industry.java.sun.com/solutions/pr
  oducts/by_product/0,2348,all-6993-99,00.html
• http//www.mt.luth.se/division/dmk/education/corba
  2/slides/lecture_5.pdf
• http//www.cs.wustl.edu/schmidt/PDF/corba4.pdf
• http//www.omg.org