TypicalExampleUnitTest.java

/*
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 * Copyright 2006, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.stm;

import org.jboss.stm.annotations.NotState;
import org.jboss.stm.annotations.Optimistic;
import org.jboss.stm.annotations.ReadLock;
import org.jboss.stm.annotations.Transactional;
import org.jboss.stm.annotations.WriteLock;

import com.arjuna.ats.arjuna.AtomicAction;

import junit.framework.TestCase;

/**
 * @author Mark Little
 */

public class TypicalExampleUnitTest extends TestCase
{   
    @Transactional
    public interface Sample
    {
       public void increment ();
       public void decrement ();
       
       public int value ();
    }

    public class MyExample implements Sample
    {
        public MyExample ()
        {
            this(0);
        }
        
        public MyExample (int init)
        {
            _isState = init;
        }
        
        @ReadLock
        public int value ()
        {
            checkTransaction();
            
            return _isState;
        }

        @WriteLock
        public void increment ()
        {
            checkTransaction();
            
            _isState++;
        }

        @WriteLock
        public void decrement ()
        {
            checkTransaction();
            
            _isState--;
        }

        private void checkTransaction ()
        {
            if (AtomicAction.Current() != null)
                _numberOfTransactions++;
        }
        
        private int _isState;
        
        @NotState
        public int _numberOfTransactions;
    }

    public void test ()
    {
        MyExample ex = new MyExample(10);
        Container<Sample> theContainer = new Container<Sample>();
        Sample obj1 = theContainer.create(ex);
        Sample obj2 = theContainer.clone(new MyExample(), obj1);
        
        assertTrue(obj2 != null);
        
        AtomicAction act = new AtomicAction();
        
        act.begin();
        
        obj1.increment();
        
        act.commit();
        
        act = new AtomicAction();
        
        act.begin();
        
        assertEquals(obj2.value(), 11);
        
        act.commit();
        
        act = new AtomicAction();
        
        act.begin();
        
        for (int i = 0; i < 1000; i++)
        {
            obj1.increment();
        }
        
        act.abort();
        
        assertEquals(ex._numberOfTransactions, 1002);
    }
}