corba.doc

Create CORBA based server-client application (for windows)



Software Requirements:

1. Java Development Kit (JDK) 8 or later
2. Eclipse or NetBeans IDE (optional)
3. JacORB or TAO CORBA implementation

Step 1: Install JacORB or TAO CORBA implementation

Download and install JacORB or TAO CORBA implementation:

- JacORB: http://www.jacorb.org/
- TAO: https://www.cs.wustl.edu/~schmidt/TAO.html

Step 2: Create the IDL file

Create a file called Hello.idl with the following content:


idl
module HelloApp
{
  interface Hello
  {
    string sayHello();
  };
};


Step 3: Compile the IDL file

Use the idlj compiler to generate the stubs and skeletons:


bash
idlj -fclient -fserver Hello.idl


Step 4: Implement the server

Create a file called HelloImpl.java with the following content:


import HelloApp.*;
import org.omg.CORBA.*;

public class HelloImpl extends HelloPOA
{
  public String sayHello()
  {
    return "Hello, world!";
  }
}


Step 5: Create the server

Create a file called HelloServer.java with the following content:


import HelloApp.*;
import org.omg.CORBA.*;

public class HelloServer
{
  public static void main(String[] args)
  {
    try
    {
      ORB orb = ORB.init(args, null);
      HelloImpl helloImpl = new HelloImpl();
      orb.connect(helloImpl);
      String[] args2 = new String[] {"-ORBInitialPort", "1050"};
      NamingContextExt namingContext = NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));
      namingContext.bind("Hello", helloImpl._this());
      System.out.println("Hello server ready...");
      orb.run();
    }
    catch (Exception e)
    {
      System.out.println("Error: " + e.getMessage());
    }
  }
}


Step 6: Implement the client

Create a file called HelloClient.java with the following content:


import HelloApp.*;
import org.omg.CORBA.*;

public class HelloClient
{
  public static void main(String[] args)
  {
    try
    {
      ORB orb = ORB.init(args, null);
      String[] args2 = new String[] {"-ORBInitialPort", "1050"};
      NamingContextExt namingContext = NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));
      Hello hello = HelloHelper.narrow(namingContext.resolve_str("Hello"));
      System.out.println(hello.sayHello());
    }
    catch (Exception e)
    {
      System.out.println("Error: " + e.getMessage());
    }
  }
}


Step 7: Compile and run the application

Compile the server and client files:

bash
javac *.java


Run the server:


bash
java HelloServer -ORBInitialPort 1050


Run the client: