/*

 * $Id$

 *

 * Copyright (C) 2003-2009 JNode.org

 *

 * This library 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 library 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 library; If not, write to the Free Software Foundation, Inc., 

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

package org.jnode.vm.memmgr;

import java.io.IOException;

import org.jnode.vm.VmSystemObject;

/**

 * Heap statistical data collection.

 *

 * @author Martin Husted Hartvig (hagar@jnode.org)

 */

public abstract class HeapStatistics extends VmSystemObject {

    /**

     * Sets the minimum number of instances a class must have before

     * it is listed in toString.

     *

     * @param count

     */

    public abstract void setMinimumInstanceCount(int count);

    /**

     * Sets the minimum bytes of occupied memory by all instances of a class

     * before it is listed in toString.

     *

     * @param bytes

     */

    public abstract void setMinimumTotalSize(long bytes);

    /**

     * Write the statistical data to an {@link Appendable}.

     * 

     * @param a

     * @throws IOException 

     */

    public abstract void writeTo(Appendable a) throws IOException;

}