greeterbean.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by ozone-db.org.
//
// Copyright (C) 1997-@year@ by Per Nyfelt. All rights reserved.
//
// $Id: GreeterBean.java,v 1.2 2003/11/29 16:19:28 per_nyfelt Exp $
package ejb;

import java.rmi.RemoteException;
import java.util.List;
import javax.ejb.*;
import javax.naming.InitialContext;

import db.FortuneGenerator;
import db.FortuneGeneratorImpl;
import org.ozoneDB.OzoneInterface;

/**
 *
 * <br> Date: Sep 7, 2002
 * @author Per Nyfelt
 */
public class GreeterBean implements SessionBean {

    private SessionContext ctx;
    private OzoneInterface db;
    private FortuneGenerator fortuneGenerator;

    public void ejbCreate() {
        try {
            db = (OzoneInterface) new InitialContext().lookup(OzoneInterface.class.getName());
            fortuneGenerator = (FortuneGenerator) db.objectForName(FortuneGenerator.class.getName());
            if (fortuneGenerator == null) {
                System.out.println("[GreeterBean] Storing new FortuneGenerator object");
                fortuneGenerator = FortuneGeneratorImpl.create(db);
            } else {
                System.out.println("[GreeterBean] Found existing FortuneGenerator object");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void ejbActivate() throws EJBException, RemoteException {
        try {
            System.out.println("[GreeterBean] connecting to ozone...");
            db = (OzoneInterface) new InitialContext().lookup(OzoneInterface.class.getName());
            System.out.println("[GreeterBean] Connected!");
            db.reloadClasses();
            System.out.println("[GreeterBean] Classes reloaded");
        } catch (Exception e) {
            throw new RemoteException(e.toString());
        }
    }

    public void ejbPassivate() throws EJBException, RemoteException {
        db = null;
    }

    public void ejbRemove() throws EJBException, RemoteException {
    }

    public void setSessionContext(SessionContext context) throws EJBException, RemoteException {
        ctx = context;
    }

    public String getGreeting() {
        System.out.println("[GreeterBean] getting greeting");
        String result = fortuneGenerator.getFortune();
        System.out.println("[GreeterBean] returning " + result);
        return result;
    }

    public void removeAllGreetings() {
        System.out.println("[GreeterBean] removing all greetings");
        fortuneGenerator.removeFortunes();
    }

    public void addGreeting(String greeting) {
        System.out.println("[GreeterBean] adding greeting " + greeting);
        fortuneGenerator.addFortune(greeting);
    }

    public List getAllGreetings() {
        System.out.println("[GreeterBean] list all greetings");
        return fortuneGenerator.getAllFortunes();
    }
}