Client.java :  » Database-DBMS » myoodb-2.2.1 » org » myoodb » transactions » Java Open Source

///////////////////////////////////////////////////////////////////////////////
//
//   Copyright (C) 2003-@year@ by Thomas M. Hazel, MyOODB (www.myoodb.org)
//
//                          All Rights Reserved
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License and GNU Library
//   General Public License as published by the Free Software Foundation;
//   either version 2, or (at your option) any later version.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//   GNU General Public License and GNU Library General Public License
//   for more details.
//
//   You should have received a copy of the GNU General Public License
//   and GNU Library General Public License along with this program; if
//   not, write to the Free Software Foundation, 675 Mass Ave, Cambridge,
//   MA 02139, USA.
//
///////////////////////////////////////////////////////////////////////////////
package org.myoodb.transactions;

import org.myoodb.objects.*;

public class Client
{
    public static int PORT = 54321;
    public static String USERNAME = "admin";
    public static String PASSWORD = "admin";

    public static String NEIGHBORHOOD[][] =
    {
        {"John", "Smith"},  // john (a.k.a dad)
        {"Mary", "Smith"},  // mary (a.k.a mom)
        {"Mark", "Johson"}, // john's neighbor
        {"Barb", "Johson"}, // john's neighbor
        {"Jack", "Smith"},  // john's son 
        {"Kate", "Smith"},  // john's daughter
        {"Jean", "Smith"},  // john's mother
    };

    public static void main(String args[]) throws Exception
    {
        org.myoodb.MyOodbDatabase db = org.myoodb.MyOodbDatabase.open("tcp://localhost:" + PORT, USERNAME, PASSWORD);

        // XXX: roots cannot be created within a transactions
        Family family = (Family) db.getRoot("Family");
        if (family == null)
        {
            System.out.println("Create The Smith Family");

            family = (Family) db.createRoot("Family", "org.myoodb.objects.FamilyDbImpl");
            //family = (Family) db.createRoot("Family", FamilyDbImpl.class);

            family.setName("Smith");
        }
        else
        {
            System.out.println("The Smith Family already created");
        }

        for (int i = 0; i < NEIGHBORHOOD.length; i++)
        {
            org.myoodb.MyOodbTransaction tx = db.createTransaction();
            tx.begin(); /* tx-1 */

            Person person = (Person) db.createObject("org.myoodb.objects.PersonDbImpl");
            //Person person = (Person) db.createObject(PersonDbImpl.class);

            person.setName(NEIGHBORHOOD[i][0]);

            System.out.println("  Checking if Person " + person + " is part of the Smith Family");

            System.out.println("  Is Person locked: " + person.isLocked());

            if (NEIGHBORHOOD[i][1].equals("Smith") == false)
            {
                System.out.println("    Person " + person + " is not part of the Smith Family");

                tx.rollback(); /* tx-1 */ // make this person disappear!

                continue;
            }

            tx.begin(); /* tx-2 */ // show how to nest

            family.add(person);

            if (family.size() > 4)
            {
                System.out.println("    The Smith Family has reached their Maximum size: " + person);

                tx.rollback(); /* tx-2 */ // undo member add

                tx.rollback(); /* tx-1 */ // make this person disappear!

                continue;
            }

            tx.commit(); /* tx-2 */

            tx.commit(); /* tx-1 */

            System.out.println("  Person " + person + " is now offically part of the Smith Family");
        }
    }
}