ProgressMeter.java

/*******************************************************************************
 * Copyright 2013
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package de.tudarmstadt.ukp.csniper.webapp.evaluation;

import static java.lang.Math.round;

public class ProgressMeter
{
	private final long _start;
	private long _preLast;
	private long _last;
	private long _count;
	private final long _limit;

	public ProgressMeter(final long limit)
	{
		_start = System.currentTimeMillis();
		_last = System.currentTimeMillis();
		_preLast = System.currentTimeMillis();
		_count = 0;
		_limit = limit;
	}

	public void next()
	{
		_count++;
		_preLast = _last;
		_last = System.currentTimeMillis();
	}

	public long getCount()
	{
		return _count;
	}
	public void setDone(final long count)
	{
		_count = count;
		_preLast = _last;
		_last = System.currentTimeMillis();
	}

	public void setLeft(final long count)
	{
		_count = _limit - count;
		_preLast = _last;
		_last = System.currentTimeMillis();
	}

	@Override
	public String toString()
	{
		final StringBuilder sb = new StringBuilder();
		sb.append(_count);
		sb.append(" of ");
		sb.append(_limit);
		if (_count > 0 && _limit > 0) {
			final int perc = 100 - (int) (((_limit - _count) * 100) / _limit);
			sb.append(" (");
			sb.append(perc);
			sb.append("%  ETA ");
			final double timeSoFar = (_last - _start);
			final long estTotal = round((timeSoFar / _count) * _limit);
			final long timeLeft = round(estTotal - timeSoFar);
			sb.append(milliToStringShort(timeLeft));
			sb.append("  RUN ");
			sb.append(milliToStringShort(_last - _start));
			sb.append("  AVG ");
			sb.append(round(timeSoFar / _count));
			sb.append("  LAST ");
			sb.append(_last - _preLast);
			sb.append(")");
		}
		return sb.toString();
	}

	public static String milliToStringShort(final long milli)
	{
		final long fracs = milli % 1000;
		final long seconds = milli / 1000;
		final long minutes = seconds / 60;
		final long hours = minutes / 60;
		return String.format("%02d:%02d:%02d.%-3d", hours, (minutes % 60), (seconds % 60), fracs);
	}
}