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 Lesser General Public License as published by
008     * the Free Software Foundation, either version 3 of the License.
009     *
010     * Commercial use is permitted to the extent that the code/component(s)
011     * do NOT become part of another Open Source or Commercially developed
012     * licensed development library or toolkit without explicit permission.
013     *
014     * DirectJNgine is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU Lesser General Public License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public License
020     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
021     * 
022     * This software uses the ExtJs library (http://extjs.com), which is 
023     * distributed under the GPL v3 license (see http://extjs.com/license).
024     */
025    
026    package com.softwarementors.extjs.djn;
027    
028    import java.text.DecimalFormat;
029    
030    import org.apache.log4j.Logger;
031    
032    import edu.umd.cs.findbugs.annotations.NonNull;
033    
034    public class Timer {
035      @NonNull public static final Logger logger = Logger.getLogger( Timer.class );
036      @NonNull private static final DecimalFormat numberFormatter = new DecimalFormat("#.##");
037    
038      private boolean running;  
039      private long startNanos;
040      private long elapsedNanoseconds;
041      
042      public Timer() {
043        restart();
044      }
045      
046      public void restart() {
047        this.running = true;
048        this.elapsedNanoseconds = 0;
049        this.startNanos = System.nanoTime() ; 
050      }
051      
052      public void stop() {
053        // assert isRunning();
054        
055        this.running = false;
056        this.elapsedNanoseconds = System.nanoTime() - this.startNanos;
057      }
058      
059      public boolean isRunning() {
060        return this.running;
061      }
062      
063      public long getElapsedMicroseconds() {
064        assert !isRunning();
065        
066        long result = this.elapsedNanoseconds / 1000;
067        return result;
068      }
069      
070      public long getElapsedMilliseconds() {
071        assert !isRunning();
072    
073        return getElapsedMicroseconds() / 1000;
074      }
075      
076      public void logDebugTimeInMilliseconds( String message ) {
077        assert !StringUtils.isEmpty(message);
078        assert !isRunning();
079      
080        if( logger.isDebugEnabled() ) {
081          logger.debug( message + ": " + numberFormatter.format(getElapsedMicroseconds() / 1000.0)+ " ms." );
082        }
083      }
084    }