MemoryUsage.java

/* -*- tab-width: 4 -*-
 *
 * Electric(tm) VLSI Design System
 *
 * File: MemoryUsage.java
 *
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 *
 * Electric(tm) is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Electric(tm) 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Electric(tm); see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, Mass 02111-1307, USA.
 */
package com.sun.electric.util.memory;

public class MemoryUsage {
    
    private static MemoryUsage instance = new MemoryUsage();
    
    private MemoryUsage() {
        
    }
    
    public static MemoryUsage getInstance() {
        return instance;
    }
    
    public long getHeapSize() {
        return Runtime.getRuntime().totalMemory();
    }
    
    public long getFreeSpace() {
        return getHeapSize() - Runtime.getRuntime().freeMemory();
    }
    
    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        
        builder.append(Memory.formatMemorySize(getFreeSpace()));
        builder.append("/");
        builder.append(Memory.formatMemorySize(getHeapSize()));
        
        return builder.toString();
    }

}