/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005-2008, Red Hat Middleware LLC, and individual contributors
 * 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.messaging.tests.unit.core.paging.impl;

import java.nio.ByteBuffer;

import org.jboss.messaging.core.paging.PageTransactionInfo;
import org.jboss.messaging.core.paging.impl.PageTransactionInfoImpl;
import org.jboss.messaging.core.remoting.impl.ByteBufferWrapper;
import org.jboss.messaging.core.remoting.spi.MessagingBuffer;
import org.jboss.messaging.tests.util.RandomUtil;
import org.jboss.messaging.tests.util.UnitTestCase;

/**
 * 
 * @author <a href="mailto:clebert.suconic@jboss.com">Clebert Suconic</a>
 *
 */
public class PageTransactionImplTest extends UnitTestCase
{

   // Constants -----------------------------------------------------

   // Attributes ----------------------------------------------------

   // Static --------------------------------------------------------

   // Constructors --------------------------------------------------

   // Public --------------------------------------------------------

   public void testAddAndRemoveMessages()
   {
      long id1 = RandomUtil.randomLong();
      long id2 = RandomUtil.randomLong();
      PageTransactionInfo trans = new PageTransactionInfoImpl(id2);

      trans.setRecordID(id1);

      // anything between 2 and 100
      int nr1 = RandomUtil.randomPositiveInt() % 98 + 2;

      for (int i = 0; i < nr1; i++)
      {
         trans.increment();
      }

      assertEquals(nr1, trans.getNumberOfMessages());

      ByteBuffer buffer = ByteBuffer.allocate(trans.getEncodeSize());
      MessagingBuffer wrapper = new ByteBufferWrapper(buffer);

      trans.encode(wrapper);
      wrapper.rewind();

      PageTransactionInfo trans2 = new PageTransactionInfoImpl(id1);
      trans2.decode(wrapper);

      assertEquals(id2, trans2.getTransactionID());

      assertEquals(nr1, trans2.getNumberOfMessages());

      for (int i = 0; i < nr1; i++)
      {
         trans.decrement();
      }

      assertEquals(0, trans.getNumberOfMessages());

      try
      {
         trans.decrement();
         fail("Exception expected!");
      }
      catch (Throwable ignored)
      {
      }

   }

   // Package protected ---------------------------------------------

   // Protected -----------------------------------------------------

   // Private -------------------------------------------------------

   // Inner classes -------------------------------------------------

}