Build CORBA Applications with C++, MICO and Win32

Luiz Carlos d´Oleronlcadb@cin.ufpe.br

http://www.cin.ufpe.br/~if677

Acknowlegdes

Mayank Mishra, Master in Computer Science, Sun MicroSystems

Nelson Souto Rosa, Doctor in Computer Science, Cin/UFPe

Break Point

This is a attachment to the regular course. In this material, only practical issues can be

found. Please, read the references of CORBA and Distributed Systems in discipline home page !

Pre-requisits

Before you continue, be sure that you have at least:

Low level C/C++ domain Familiar with Middlewares, CORBA and Distributed

Systems concepts Solid knowledges in Object Oriented Paradgma Familiar with Windows and Microsoft Visual Studio 2003

platform*

* so little work is sufficient to migrate to others platforms

What´s MICO

MICO is CORBA! Micro CORBA A Implementation of CORBA specification subset With him you can write CORBA applications in C+

+ or Java Visit http://www.mico.org

Install MICO on Windows

Download MICO source from mico.org

Unzip it

Read README-WIN32 to compile the source

Edit the environment variables to add win32-bin directory to PATH variable

You can download a compiled distribution of MICO to Win32 in http://www.cin.ufpe.br/~if677/monitoria/corba

Configure Visual Studio ProjectConfigure Visual Studio Project

1) File ->New->Project…

2) Expand “Visual C++ Projects”

3) Select Win32 Folder

4) Select Win32 Console Project

5) Enter a Name to Project

6) Click OK

Configure Visual Studio ProjectConfigure Visual Studio Project

7) Click in “Application Settings”

8) Be sure that the “Console application” is selected

9) Mark the “Empty project” checkbox

10) Click in Finish to create the project

Configure Visual Studio ProjectConfigure Visual Studio Project

Was create a simple Empty project

11) Go to Project Menu12) Select the “Properties” Item

Where are the C/C++ Option? :OFor Respond:

13) Click in Cancel Button

Configure Visual Studio ProjectConfigure Visual Studio Project

14) Add a new file from source15) Select C++ File

16) Choose a name to a file, like “server.cpp”17) Click in “Open”:D

Configure Visual Studio ProjectConfigure Visual Studio Project

Well, the file server.cpp was created. Now,

18) Click in Project Menu

19) Select PropertiesTharamm! The C/C++ folder is enable!

20) Expand him

21)

In “Additional include Directories”

enter the complete path from the Include folder of MICO distro.

Configure Visual Studio ProjectConfigure Visual Studio Project

22) Expand linker

23) In “ Additonal Library Directories, enter the complete path of the lib folder over win32-bin directory of MICO

24) Select Input

25) Enter the mico2312.lib and micocoss2312.lib references.

26) Click OK

Finish the Visual Studio Project Configuration for MICO Applications

Create and Compile the IDL FileCreate and Compile the IDL File

interface Account{

void deposit(in long amount);void withdraw(in long amount);long balance();

};

account.idl

1) Create the account.idl text file in project folder

2) Open the cmd (start->run enter ‘cmd’)

3) Go to project folder

4) Enter “idl account.idl”

The idl.exe from MICO will compile the account.idl and generate two files:

• account.h

• account.cc

Add this files to project

Additional TasksAdditional Tasks

Hei, in account.cc file, change the include <account.h> to “account.h”

Do you remember the server.cpp file? Open and enter the includes:

#include <iostream>#include <fstream>#include "account.h"

Coding the serverCoding the server

Create Account_impl class, that will execute the business logic

Coding the serverCoding the server

Don’t forget the witdraw and balance methods

Coding the serverCoding the server

Coding the serverCoding the server

Excecute the serverExcecute the server

Observe the account.ior file generated in project folder.

account.ior

The ior file have data that represents the remote object location

In each execution, a new account.ior file is created, and replace the prior

Clients that use the server will need read the account.ior file to locate the remote object

Create the Client1. The client is another process that use CORBA to communicate

with the server

2. Thus, we need create another project to coding the client (in new instance of MS Visual Studio)

3. Create the AccountClient project, and configure it with the instructions few slides ago. Instead of server.cpp, generate the client.cpp file

4. Copy from the server project to the client project the three files: account.cc, account.h and account.ior

5. Add to project only the account.cc and account.h

Create the ClientCreate the Client

Create the ClientCreate the Client

Execute the clientExecute the client

Client´s execution with the server response. If you have communication matters, try copy any time the account.ior file from server project to client project. Note that the client can execute serious times with the same server process

The bootstrapping problem

How client obtains the first server´s reference? To solve this problem, server´s information go to

client outside the CORBA Framework There are some approachs:

File-Based Bootstrapping (used in our example) Naming Service

Naming Service

Naming Service is crucial in distributed applications

Examples: java RMI Registry and DNS The Corba Naming Service maps names to

Remote Objects Client yet knew where is the Naming Service Naming Server resolve names in references

Naming Service Refactored Example - server

In server.cpp file, edit only the header declarations, plus the <coss/CosNaming.h> include, and the main method

Naming Service Refactored Example - server

Naming Service Refactored Example - server

Naming Service Refactored Example - client

Naming Service Refactored Example - client

Starting Naming Service1. Open the command prompty

2. Navigate to the server project directory

3. Enter

nsd -ORBIIOPAddr inet:localhost:9001

That start Naming Service on port 9001

Execute the server and the client

1) The server startup

2) The client execution

3) The server execution

Issues

Be sure that you understand:

How the server and the client acquire the Naming Service reference

How server use the Naming Service to bind the Account reference to a name

How client acquire the Account remote reference How client use the methods from the Account Remote reference

References

Distributed Systems Architecture – Arno Puder at al C++ Programming with CORBA - Andreas Vogel at al Advanced CORBA® Programming with C++ - Michi

Henning at al MICO-mail list www.mico.org

Luiz Carlos d´Oleron Graduate in Computer Science, CIn/UFPE

http://www.cin.ufpe.br

Monitor Infra-Estrutura de Software http://www.cin.ufpe.br/~if677