Re: Passing an interface to a bean ?????

[Luis F. Canals]

Hello, Henry:
        I've done this simple Stateful Session Bean and I have no problem. Please,
read it and say me the differences between your solution and mine (I'm using
WebLogic 5.1):

/*-------------------------------------------------------------------
 * Home interface
 */
import javax.ejb.*;
import java.rmi.RemoteException;

public interface StatefulHome extends EJBHome {
    public Stateful create() throws RemoteException, CreateException;
}

/*-------------------------------------------------------------------
 * Remote interface
 */
import javax.ejb.*;
import java.rmi.RemoteException;
import javax.naming.*;

public interface Stateful extends EJBObject {
        public void setToken(String name, MyToken t) throws RemoteException;
        public MyToken getToken()  throws RemoteException;
}

/*-----------------------------------------------------------------
 * Bean
 */
import javax.ejb.*;
import java.util.*;

public class StatefulBean implements SessionBean {
        public String name;
        public String value;

        public void ejbCreate() {}
        public void ejbPostCreate() {}
        public void ejbActivate() {}
        public void ejbPassivate() {}
        public void ejbStore() {}
        public void ejbLoad() {}
        public void ejbRemove() {}
        public void setSessionContext(SessionContext ctx) {}

        public void setToken(String name, MyToken t) {
                this.name = name;
                this.value = t.getValue(name);
        }

        public MyToken getToken() {
                MyToken ut = new UnToken();
                ut.setValue(name,value);
                return ut;
        }
}

/*--------------------------------------------------------
 * Token class
 */
import java.util.Vector;

public class UnToken implements MyToken {
        protected Vector names = new Vector();
        protected Vector values = new Vector();

        public String getValue(String name) {
                String ret = (String) values.elementAt(names.indexOf(name));
                return ret;
        }

        public void setValue(String name, String value) {
                if(names.contains(name)) {
                        return;         // Can't change (it's only a test)
                } else {
                        names.addElement(name);
                        values.addElement(value);
                }
        }
}

/*----------------------------------------------------------------
 * MyToken interface
 */
import java.io.Serializable;

public interface MyToken extends Serializable {
  public String getValue(String name);
  public void setValue(String name, String value);
}

/*----------------------------------------------------------------
 * Client
 */
import javax.ejb.*;
import javax.rmi.*;
import javax.naming.*;
import java.rmi.RemoteException;
import java.util.*;

public class Client {
  public static void main(String args[]) {
    try {
        Properties p = new Properties();

p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory
");
        p.put(Context.PROVIDER_URL,"t3://localhost:7001");
        Context ctx = new InitialContext(p);

        Object ref = ctx.lookup("StatefulBean");
        StatefulHome bean_home = (StatefulHome)
PortableRemoteObject.narrow(ref,StatefulHome.class);
        Stateful     bean      = bean_home.create();

        // Put a token inside the bean
        MyToken mt = new UnToken();
        mt.setValue("Name","Value");
        bean.setToken("Name", mt);

        // Get the token of the bean
        MyToken mt2 = bean.getToken();
        System.out.println("Name="+mt2.getValue("Name"));
    } catch(Exception e) {
        System.out.println("Il y a un petit problem...");
        System.out.println(e.toString());
    }
  }
}


Regards.


Luis F. Canals Samaniego
CEDETEL
Parque Tecnol�gico de Boecillo
Edificio Centro, Parcela 109
E-47151 Boecillo (Valladolid)
SPAIN

Tfno: +34 983 54 65 02
Fax:  +34 983 54 66 96


-----Mensaje original-----
De: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]En nombre de Henry Voyer (hotmail)
Enviado el: lunes 10 de julio de 2000 16:17
Para: [EMAIL PROTECTED]
Asunto: Passing an interface to a bean ?????


> Hi everyone.
>
> for modularity, i need to pass a token interface to a method of a session
bean.
>
> as an example i have
>
> public interface aToken implements Serializable
> {
>  public String getValue(String name);
>  public void setValue(String name, String value);
> }
>
> i implemented my session bean to receive this interface and use the
methods.
>
> i use a class implements aToken to send messages to my session bean
> this class use a Vector to store and retrieve values.
>
> but i always have java.lang.null exception.
>
> Is it ok to pass an interface or i have to use a class and extends it to
pass my objects??
>
> Thanks a lot
> merci beaucoup
> henry
>

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