A class for timing things.
/* Copyright (C) 2003 Univ. of Massachusetts Amherst, Computer Science Dept.
This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
http://www.cs.umass.edu/~mccallum/mallet
This software is provided under the terms of the Common Public License,
version 1.0, as published by http://www.opensource.org. For further
information, see the file `LICENSE' included with this distribution. */
//package cc.mallet.util;
/**
* A class for timing things.
* Originally inspired by the Timing class in the Stanford NLP cade,
* but completely rewritten.
* <p/>
* Created: Dec 30, 2004
*
* @author <A HREF="mailto:casutton@cs.umass.edu>casutton@cs.umass.edu</A>
* @version $Id: Timing.java,v 1.1 2007/10/22 21:37:40 mccallum Exp $
*/
public class Timing {
private long objCreationTime;
private long startTime;
public Timing ()
{
startTime = System.currentTimeMillis ();
objCreationTime = startTime;
}
/**
* Print to System.out how much time has passed, resetting this Timing's start time to
* the current time. Time is measured from the most recent
* <code>tick</code> call, or when this object was created.
*
* @param msg Prefix of string printed with time
* @return Number of elapsed milliseconds from tick (or start)
*/
public long tick (String msg)
{
long elapsed = report (msg);
startTime = System.currentTimeMillis ();
return elapsed;
}
/**
* Returns how much time as passed since Object creation, or the most recent call to tick().
* @return Number of elapsed milliseconds
*/
public long elapsedTime ()
{
return System.currentTimeMillis () - startTime;
}
/**
* Returns the number of milliseconds since this object was created.
* Ignores previous calls to <tt>tick</tt>, unlike
* <tt>elapsedTime</tt> and <tt>tick</tt>.
*/
public long totalElapsedTime ()
{
return System.currentTimeMillis () - objCreationTime;
}
/** Like tick(), but doesn't reset the counter. */
public long report (String msg)
{
long currentTime = System.currentTimeMillis ();
long elapsed = currentTime - startTime;
System.out.println (msg + " time (ms) = " + (elapsed));
return elapsed;
}
}
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