/*
 * TestMemory.java
 *
 * Created on 30 November 2001, 14:03
 * Last updated on 09 November 2007
 *
 * Copyright (C) 2007 Andy Turner, University of Leeds, UK.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */

package uk.ac.leeds.ccg.andyt.tests.java;

/**
 * @author  Andy Turner
 * @author  Paul Townend
 * @version 0.2
 */
public class TestMemory {
    
    private Runtime _Runtime;
    
    private long maxMemory;
    private long allocatedMemory;
    private long freeMemory;
    
    public TestMemory(){
        _Runtime = java.lang.Runtime.getRuntime();
    }
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        TestMemory _TestMemory = new TestMemory();
        _TestMemory.run();
    }
    
    public void run() {
        
        //printMemoryInformation();
        System.gc();
        System.out.println("Garbage Collect");
        //printMemoryInformation();
        
        // Set some longs for storing amount of available memory
        //int _int0 = 7734751; //Max for Netbeans normal runs;
        int _int0 = 7734670; //Max for Netbeans debug runs;
        int _int1 = 0;
        double[] _doubleArray;
        int[] _intArray;
        byte[] _byteArray;
        
        int _intZero = 0;
        //long _long0 = 10240L;
        //long _long1 = 0L;
        
        try {
            do {
                System.gc();
                _doubleArray = new double[_int0];
                _int0 += 1;
            } while ( true );
        } catch ( OutOfMemoryError _OutOfMemoryError ) {
            System.gc();
            System.out.println("_int0 " + _int0 );
            _int0 -= 1;
            _doubleArray = new double[_int0];
            System.gc();
            printMemoryInformation();
            try {
                System.out.println("What is left?"); // Obviously enough to print this!
                _int0 = 1048572; //Max for Netbeans normal runs;
                do {
                    System.gc();
                    _intArray = new int[ _int0 ];
                    for ( _int1 = _intZero; _int1 < _int0; _int1 ++ ) {
                        _intArray[ _int1 ] = _int1;
                    }
                    System.gc();
                    //System.out.println( _int0 );
                    //printMemoryInformation();
                    _int0 ++;
                } while ( true );
            } catch ( OutOfMemoryError _OutOfMemoryError2 ) {
                System.gc();
                _int0 --;
                System.out.println("_int0 " + _int0 );
                _intArray = new int[ _int0 ];
                for ( _int1 = _intZero; _int1 < _int0; _int1 ++ ) {
                    _intArray[ _int1 ] = _int1;
                }
                System.gc();
                printMemoryInformation();
                try {
                    System.out.println("What is left?"); // Obviously enough to print this!
                    System.gc();
                    _int0 = 458739;
                    System.gc();
                    do {
                        System.gc();
                        _byteArray = new byte[ _int0 ];
                        for ( _int1 = _intZero; _int1 < _int0; _int1 ++ ) {
                            _byteArray[ _int1 ] = Byte.MAX_VALUE;
                        }
                        System.gc();
                        //System.out.println( _int0 );
                        //printMemoryInformation();
                        _int0 ++;
                    } while ( true );
                } catch ( OutOfMemoryError _OutOfMemoryError3 ) {
                    System.gc();
                    _int0 --;
                    System.out.println("_int0 " + _int0 );
                    _byteArray = new byte[ _int0 ];
                    for ( _int1 = _intZero; _int1 < _int0; _int1 ++ ) {
                        _byteArray[ _int1 ] = Byte.MAX_VALUE;
                    }
                    System.gc();
                    //printMemoryInformation(); // Not enough memory to print this!
                    try {
                        System.gc();
                        printMemoryInformation2(); // Not enough memory to print this!
                    } catch ( OutOfMemoryError _OutOfMemoryError4 ) {
                        try {
                            // More memory can be allocated here
                            int _int3 = 0; // Despite not seeming to have any memory accroding to _Runtime, we can allocate this.
                            System.out.println( _int3 );
                            System.out.println( "Finish 0" );
                        } catch ( OutOfMemoryError _OutOfMemoryError5 ) {
                            System.out.println( "Finish 1" );
                        }
                    }
                }
            }
        }
    }
    
    
    /**
     * @Return The TotalFreeMemory available as calculated from _Runtime.
     */
    protected long getTotalFreeMemory() {
        long result;
        maxMemory = _Runtime.maxMemory();
        allocatedMemory = _Runtime.totalMemory();
        freeMemory = _Runtime.freeMemory();
        result = ( freeMemory + ( maxMemory - allocatedMemory ) ) / 1024;
        return result;
    }
    
    /**
     * Prints out Memory Information.
     */
    protected void printMemoryInformation() {
        maxMemory = _Runtime.maxMemory();
        allocatedMemory = _Runtime.totalMemory();
        freeMemory = _Runtime.freeMemory();
        System.out.println("free memory: " + freeMemory / 1024);
        System.out.println("allocated memory: " + allocatedMemory / 1024);
        System.out.println("max memory: " + maxMemory / 1024);
        System.out.println("total free memory: " + (freeMemory + (maxMemory - allocatedMemory)) / 1024);
    }
    
    /**
     * Prints out Memory Information.
     */
    protected void printMemoryInformation2() {
        maxMemory = _Runtime.maxMemory();
        allocatedMemory = _Runtime.totalMemory();
        freeMemory = _Runtime.freeMemory();
        System.out.println(freeMemory);
        System.out.println(allocatedMemory);
        System.out.println(maxMemory);
        System.out.println(freeMemory + (maxMemory - allocatedMemory));
    }
    
    
}