source: trunk/src/org/expeditee/stats/AgentStats.java@ 1442

/**
 *    AgentStats.java
 *    Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
 *
 *    This program 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.
 *
 *    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.expeditee.stats;

import java.util.Date;

public class AgentStats {

        private static int _ItemsExecuted = 0;

        private static int _FramesExecuted = 0;

        private static String SECONDS = "sec";

        private static Date _StartTime = new Date();

        private static String getTimeElapsedString() {
                return "Time: " + getSecondsElapsed() + SECONDS;
        }

        public static long getMilliSecondsElapsed() {
                return new Date().getTime() - _StartTime.getTime();
        }

        public static String getStats() {
                StringBuffer stats = new StringBuffer();
                stats.append("Run ").append(getTimeElapsedString()).append(
                                ", Processed ");
                appendStat(stats, "frames", _FramesExecuted, ", ");
                appendStat(stats, "items", _ItemsExecuted, "");
                return stats.toString();
        }

        private static double getSecondsElapsed() {
                return (new Date().getTime() - _StartTime.getTime()) / 1000.0;
        }

        /**
         * Appends a single stats to a string buffer containing a collection of
         * stats.
         * 
         * @param stats
         *            The string buffer to append the stat onto
         * @param name
         *            The name of the stat
         * @param value
         *            The new value for the stat
         */
        private static void appendStat(StringBuffer stats, String name, int value,
                        String separator) {
                // prevent divide by zero errors
                if (value < 0)
                        value = 0;

                int perSec = (int) (value / Math.max(0.001, getSecondsElapsed()));

                stats.append(value).append(" ").append(name).append(" @ ").append(
                                perSec).append("/" + SECONDS);
                stats.append(separator);
        }

        public static void reset() {
                _StartTime = new Date();
                _FramesExecuted = 0;
                _ItemsExecuted = 0;
        }

        /**
         * Called signal that a frame has been accessed.
         * 
         */
        public static void FrameExecuted() {
                _FramesExecuted++;
        }

        public static void ItemExecuted() {
                _ItemsExecuted++;
        }
}