IDLおよびPOAを使用したHello World

1 Hello IDLインタフェース

// hello.idl
module helloWorld
{
    interface Hello
    {
    |   string sayHello();
    };
};

idl2java -poa -compile -ds gensrc -d ../../lib hello.idl

Hello               // Java interface corresponding to IDL interface
HelloOperations     // methods on the Java interface
HelloHelper         // helper methods for narrow, read, write
HelloHolder         // holder for out and inout parameters
HelloPOA            // inheritance based POA Skeleton
HelloPOATie         // delegation based POA Skeleton
_HelloStub          // Stub

package poaHello;
                                                                           
public class HelloImpl extends helloWorld.HelloPOA
{
    public String sayHello()
    {
    |   return "Hello World!\n";
    }
}

4 Hello Worldサーバ

package helloWorld;
                                                                           
import util.Util;
import org.omg.CORBA.ORB;
                                                                           
public class helloClient
{
    public static void main(String[] args)
    {
    |   try {
    |   |                                                                  
    |   |   // create the jBroker ORB
    |   |   ORB orb = ORB.init(args, null);
    |   |                                                                  
    |   |   // read the stringified object reference
    |   |   String helloIOR = Util.readIOR("ior");
    |   |                                                                  
    |   |   // narrow the stringified object
    |   |   Hello hello = HelloHelper.narrow(orb.string_to_object(helloIOR));
    |   |                                                                  
    |   |   // invoke method on the object
    |   |   System.out.println(hello.sayHello());
    |   |                                                                  
    |   } catch (Exception ex) {
    |   |   ex.printStackTrace();
    |   }
    }
}

6.1 Helloの実装

HelloImpl2のサンプルからのhelloWorldを引き続き使用できます。

package helloWorld;
                                                                           
public class HelloImpl2 implements HelloOperations
{
    public String sayHello()
    {
    |   return "Hello World!\n";
    }
}

6.2 Hello Worldサーバ

ここでは、サーバントの作成手順が前とは異なります。TIEオブジェクトは実際にHelloPOAを拡張します。

package poaHello;
                                                                           
import util.Util;
import org.omg.CORBA.ORB;
                                                                           
import org.omg.PortableServer.POA;
import org.omg.PortableServer.Servant;
                                                                           
import helloWorld.HelloImpl2;
import helloWorld.HelloPOATie;
                                                                           
public class helloServer2
{
    public static void main(String[] args)
    {
    |   try {
    |   |                                                                  
    |   |   // create the jBroker ORB
    |   |   ORB orb = ORB.init(args, null);
    |   |                                                                  
    |   |   // create a servant
    |   |   Servant hello = new HelloPOATie(new HelloImpl2());
    |   |                                                                  
    |   |   // get the root POA
    |   |   POA rootPOA = (POA) orb.resolve_initial_references("RootPOA");
    |   |                                                                  
    |   |   // create a stringified object reference
    |   |   String helloIOR = orb.object_to_string(
    |   |       rootPOA.servant_to_reference(hello));
    |   |                                                                  
    |   |   // write the stringified object reference
    |   |   Util.writeIOR(helloIOR, "ior", true);
    |   |                                                                  
    |   |   // activate the Root POA
    |   |   rootPOA.the_POAManager().activate();
    |   |                                                                  
    |   |   // wait for invocations
    |   |   System.out.println("waiting for invocations ...");
    |   |   orb.run();
    |   |                                                                  
    |   } catch (Exception ex) {
    |   |   ex.printStackTrace();
    |   }
    }
}