package ca.pfv.spmf.tools;
/*
* Copyright (c) 2008-2012 Philippe Fournier-Viger
*
* This file is part of the SPMF DATA MINING SOFTWARE
* (http://www.philippe-fournier-viger.com/spmf).
*
* SPMF 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.
*
* SPMF 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 SPMF. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* This class is used to record the maximum memory usaged of an algorithm during
* a given execution.
* It is implemented by using the "singleton" design pattern.
*
*/
public class MemoryLogger {
// the only instance of this class (this is the "singleton" design pattern)
private static MemoryLogger instance = new MemoryLogger();
// variable to store the maximum memory usage
private double maxMemory = 0;
/**
* Method to obtain the only instance of this class
* @return instance of MemoryLogger
*/
public static MemoryLogger getInstance(){
return instance;
}
/**
* To get the maximum amount of memory used until now
* @return a double value indicating memory as megabytes
*/
public double getMaxMemory() {
return maxMemory;
}
/**
* Reset the maximum amount of memory recorded.
*/
public void reset(){
maxMemory = 0;
}
/**
* Check the current memory usage and record it if it is higher
* than the amount of memory previously recorded.
*/
public void checkMemory() {
double currentMemory = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())
/ 1024d / 1024d;
if (currentMemory > maxMemory) {
maxMemory = currentMemory;
}
}
}