hellobean.java

《精通RMI：Java与EJB企业级应用开发》书籍的源代码. 本书是讲述RMI技术的经典著作

/*
 * Copyright 1999 by dreamBean Software,
 * All rights reserved.
 */
package masteringrmi.helloejb.ejb;

import javax.ejb.CreateException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
 *   This is a remote object that implements the remote interface.
 *   This is the Jini service we want to provide
 *
 *   @see masteringrmi.helloejb.interfaces.HelloWorld
 *   @author Rickard 謆erg ([e-mail])
 *   @version 1.0
 */
public class HelloBean
   implements SessionBean
{
   // Attributes implementation -------------------------------------
   String myName;
   
   // HelloWorld implementation -------------------------------------
   /**
    *   Create a greeting.
    *
    * @param   name  a name
    * @return     a name a greeting including the name and the nr of invocations
    */
   public String helloWorld(String name)
   {
      return "Hello "+name+"! My name is "+myName;
   }
   
   // SessionBean implementation ------------------------------------
   public void ejbCreate()
      throws CreateException
   {
      try
      {
         // Retrieve our name from the environment settings
         myName = (String)new InitialContext().lookup("java:comp/env/myName");
      } catch (NamingException e)
      {
         throw new CreateException("Could not get name for component");
      }
   }
   
   public void setSessionContext(SessionContext ctx) 
   {
      // Don't need the context so we don't store it
   }
   
   public void ejbActivate() 
   {
      // Only applies to stateful sessions
   }
   
   public void ejbPassivate() 
   {
      // Only applies to stateful sessions
   }
   
   public void ejbRemove() 
   {
      // Nothing to do here in our case
   }
}