001    /*
002     * Copyright © 2008, 2009 Pedro Agulló Soliveres.
003     * 
004     * This file is part of DirectJNgine.
005     *
006     * DirectJNgine is free software: you can redistribute it and/or modify
007     * it under the terms of the GNU General Public License as published by
008     * the Free Software Foundation, either version 3 of the License.
009     *
010     * DirectJNgine is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013     * GNU General Public License for more details.
014     *
015     * You should have received a copy of the GNU General Public License
016     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
017     * 
018     * This software uses the ExtJs library (http://extjs.com), which is 
019     * distributed under the GPL v3 license (see http://extjs.com/license).
020     */
021    
022    package com.softwarementors.extjs.djn;
023    
024    import java.text.DecimalFormat;
025    
026    import org.apache.log4j.Logger;
027    
028    public class Timer {
029      private static final Logger logger = Logger.getLogger( Timer.class );
030      private static final DecimalFormat numberFormatter = new DecimalFormat("#.##");
031    
032      private boolean running;  
033      private long startNanos;
034      private long elapsedNanoseconds;
035      
036      public Timer() {
037        restart();
038      }
039      
040      public void restart() {
041        this.running = true;
042        this.elapsedNanoseconds = 0;
043        this.startNanos = System.nanoTime() ; 
044      }
045      
046      public void stop() {
047        assert isRunning();
048        
049        this.running = false;
050        this.elapsedNanoseconds = System.nanoTime() - this.startNanos;
051      }
052      
053      public boolean isRunning() {
054        return this.running;
055      }
056      
057      public long getElapsedMicroseconds() {
058        assert !isRunning();
059        
060        long result = this.elapsedNanoseconds / 1000;
061        return result;
062      }
063      
064      public long getElapsedMilliseconds() {
065        assert !isRunning();
066    
067        return getElapsedMicroseconds() / 1000;
068      }
069      
070      public void logDebugTimeInMilliseconds( String message ) {
071        assert !StringUtils.isEmpty(message);
072        assert !isRunning();
073      
074        if( logger.isDebugEnabled() ) {
075          logger.debug( message + ": " + numberFormatter.format(getElapsedMicroseconds() / 1000.0)+ " ms." );
076        }
077      }
078    }