4 Using Oracle WebLogic Tuxedo Connector for RMI/IIOP and CORBA Interoperability

Example 4-1 Example Service Application

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public String Toupper(String toConvert)
throws RemoteException
{
     log("toupper called, converting " + toConvert);

     try {
        // Initialize the ORB.
        String args[] = null;
         Properties Prop;
        Prop = new Properties();
        Prop.put("org.omg.CORBA.ORBClass",
                "weblogic.wtc.corba.ORB");

        ORB orb = (ORB) new InitialContext().lookup("java:comp/ORB");

        // Get the simple factory.
        org.omg.CORBA.Object simple_fact_oref =
        orb.string_to_object("corbaname:tgiop:simpapp#simple_factory");

        //Narrow the simple factory.
        SimpleFactory simple_factory_ref =
        SimpleFactoryHelper.narrow(simple_fact_oref);

        // Find the simple object.
        Simple simple = simple_factory_ref.find_simple();

        // Convert the string to upper case.
        org.omg.CORBA.StringHolder buf = 
          new org.omg.CORBA.StringHolder(toConvert);
        simple.to_upper(buf);
        return buf.value;
     }
     catch (Exception e) {
        throw new RemoteException("Can't call TUXEDO CORBA server: " +e);
     }
}
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Example 4-2 Example FactoryFinder Code

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public ConverterResult convert (String changeCase, String mixed) 
throws ProcessingErrorException
{
     String result;
     try {
     // Initialize the ORB.
     String args[] = null;
     Properties Prop;
     Prop = new Properties();
     Prop.put("org.omg.CORBA.ORBClass","weblogic.wtc.corba.ORB");
     ORB orb = (ORB)new InitialContext().lookup("java:comp/ORB");

     org.omg.CORBA.Object fact_finder_oref =
         orb.string_to_object("corbaloc:tgiop:simpapp/FactoryFinder");

     // Narrow the factory finder.
     FactoryFinder fact_finder_ref =
        FactoryFinderHelper.narrow(fact_finder_oref);

     // find_one_factory_by_id
     org.omg.CORBA.Object simple_fact_oref =
        fact_finder_ref.find_one_factory_by_id(FactoryFinderHelper.id());

     // Narrow the simple factory.
     SimpleFactory simple_factory_ref =
        SimpleFactoryHelper.narrow(simple_fact_oref);

     // Find the simple object.
     Simple simple = simple_factory_ref.find_simple();

     if (changeCase.equals("UPPER")) {
     // Invoke the to_upper opeation on M3 Simple object
     org.omg.CORBA.StringHolder buf = 
        new org.omg.CORBA.StringHolder(mixed);
     simple.to_upper(buf);
     result = buf.value;
     }
     else
     {
     result = simple.to_lower(mixed);
     }

     }
     catch (org.omg.CORBA.SystemException e) {e.printStackTrace();

     throw new ProcessingErrorException("Converter error: Corba system exception: " + e);
     }
     catch (Exception e) {
     e.printStackTrace();
     throw new ProcessingErrorException("Converter error: " + e);
     }
return new ConverterResult(result);
}
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Example 4-4 Example ejb-jar.xml File Passing a FederationURL to an EJB

<?xml version="1.0"?>

<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 
1.1//EN' 'http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd'>

<ejb-jar>
     <small-icon>images/green-cube.gif</small-icon>
     <enterprise-beans>
     <session>
          <small-icon>images/orange-cube.gif</small-icon>
          <ejb-name>IIOPStatelessSession</ejb-name>
          <home>examples.iiop.ejb.stateless.TraderHome</home>
          <remote>examples.iiop.ejb.stateless.Trader</remote>
          <ejb-class>examples.iiop.ejb.stateless.TraderBean</ejb-class>
          <session-type>Stateless</session-type>
          <transaction-type>Container</transaction-type>
          <env-entry>
               <env-entry-name>foreignOrb</env-entry-name>
               <env-entry-type>java.lang.String </env-entry-type>
               <env-entry-value>corbaloc:tgiop:simpapp</env-entry-value>
          </env-entry>
          <env-entry>
               <env-entry-name>WEBL</env-entry-name>
               <env-entry-type>java.lang.Double </env-entry-type>
               <env-entry-value>10.0</env-entry-value>
          </env-entry>
          <env-entry>
               <env-entry-name>INTL</env-entry-name>
               <env-entry-type>java.lang.Double </env-entry-type>
               <env-entry-value>15.0</env-entry-value>
          </env-entry>
          <env-entry>
               <env-entry-name>tradeLimit</env-entry-name>
               <env-entry-type>java.lang.Integer </env-entry-type>
               <env-entry-value>500</env-entry-value>
          </env-entry>
     </session>
     </enterprise-beans>
     <assembly-descriptor>
          <container-transaction>
               <method>
                    <ejb-name>IIOPStatelessSession</ejb-name>
                    <method-intf>Remote</method-intf>
                    <method-name>*</method-name>
               </method>
          <trans-attribute>NotSupported</trans-attribute>
          </container-transaction>
     </assembly-descriptor>
</ejb-jar>

To pass the FederationURL to the EJB at run-time, add an env-entry for the EJB in the ejb-jar.xml file for your application. You must assign the following env-entry sub-elements:

Example 4-5 Example TraderBean.java Code to get InitialContext

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public void createRemote() throws CreateException {
     log("createRemote() called");

     try {
          InitialContext ic = new InitialContext();

     // Lookup a EJB-like CORBA server in a remote CORBA domain
          Hashtable env = new Hashtable();
          env.put(Context.PROVIDER_URL, (String)
             ic.lookup("java:/comp/env/foreignOrb")
             + "/NameService");

          InitialContext cos = new InitialContext(env);
          TraderHome thome =
             (TraderHome)PortableRemoteObject.narrow(
             cos.lookup("TraderHome_iiop"),TraderHome.class);
             remoteTrader = thome.create();
}
     catch (NamingException ne) {
     throw new CreateException("Failed to find value "+ne);
}
     catch (RemoteException re) {
     throw new CreateException("Error creating remote ejb "+re);
}
}
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Use the following steps to use FederationURL to obtain an InitialContext for a remote Oracle Tuxedo CORBA object: