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 }