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/*
* Copyright (c) 2001-2004 Ant-Contrib project. All rights reserved.
*
* 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 net.sf.antcontrib.perf;
/**
* A stopwatch, useful for 'quick and dirty' performance testing. Typical usage:
* <pre>
* StopWatch sw = new StopWatch(); // automatically starts
* // do something here...
* sw.stop();
* System.out.println(sw.toString()); // print the total
* sw.start(); // restart the stopwatch
* // do some more things...
* sw.stop();
* System.out.println(sw.format(sw.elapsed()); // print the time since the last start
* System.out.println(sw.toString()); // print the cumulative total
* </pre>
* <p>Developed for use with Antelope, migrated to ant-contrib Oct 2003.
*
* @author Dale Anson
* @version $Revision: 1.4 $
*/
public class StopWatch {
/** an identifying name for this stopwatch */
private String name = "";
/** storage for start time */
private long startTime = 0;
/** storage for stop time */
private long stopTime = 0;
/** cumulative elapsed time */
private long totalTime = 0;
/** is the stopwatch running? */
private boolean running = false;
/**
* Starts the stopwatch.
*/
public StopWatch() {
this( "" );
}
/**
* Starts the stopwatch.
* @param name an identifying name for this StopWatch
*/
public StopWatch( String name ) {
this.name = name;
start();
}
/**
* Starts/restarts the stopwatch. <code>stop</code> must be called prior
* to restart.
*
* @return the start time, the long returned System.currentTimeMillis().
*/
public long start() {
if ( !running )
startTime = System.currentTimeMillis();
running = true;
return startTime;
}
/**
* Stops the stopwatch.
*
* @return the stop time, the long returned System.currentTimeMillis().
*/
public long stop() {
stopTime = System.currentTimeMillis();
if ( running ) {
totalTime += stopTime - startTime;
}
startTime = stopTime;
running = false;
return stopTime;
}
/**
* Total cumulative elapsed time.
*
* @return the total time
*/
public long total() {
stop();
long rtn = totalTime;
totalTime = 0;
return rtn;
}
/**
* Elapsed time, difference between the last start time and now.
*
* @return the elapsed time
*/
public long elapsed() {
return System.currentTimeMillis() - startTime;
}
/**
* @return the name of this StopWatch
*/
public String getName() {
return name;
}
/**
* Formats the given time into decimal seconds.
* @return the time formatted as mm:ss.ddd
*/
public String format( long ms ) {
String total = String.valueOf( ms );
String frontpad = "000";
int pad_length = 3 - total.length();
if ( pad_length >= 0 )
total = "0." + frontpad.substring( 0, pad_length ) + total;
else {
String dec = total.substring( total.length() - 3 );
total = "";
int min = 0, sec = 0;
min = ( int ) ( ms / 60000 );
sec = min > 0 ? ( int ) ( ( ms - ( min * 60000 ) ) / 1000 ) : ( int ) ( ms / 1000 );
if ( min > 0 ) {
total = String.valueOf( min ) + ":" + ( sec < 10 ? "0" : "" ) + String.valueOf( sec ) + "." + dec;
}
else {
total = String.valueOf( sec ) + "." + dec;
}
}
return total + " sec";
}
/**
* Returns the total elapsed time of the stopwatch formatted in decimal seconds.
* @return [name: mm:ss.ddd]
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append( "[" );
if ( name != null )
sb.append( name ).append( ": " );
sb.append( format( totalTime ) );
sb.append( "]" );
return sb.toString();
}
public static void main ( String[] args ) {
StopWatch sw = new StopWatch( "test" );
// test the formatter
System.out.println( sw.format( 1 ) );
System.out.println( sw.format( 10 ) );
System.out.println( sw.format( 100 ) );
System.out.println( sw.format( 1000 ) );
System.out.println( sw.format( 100000 ) );
System.out.println( sw.format( 1000000 ) );
// test the stopwatch
try {
System.out.println( "StopWatch: " + sw.getName() );
Thread.currentThread().sleep( 2000 );
sw.stop();
System.out.println( sw.toString() );
sw.start();
Thread.currentThread().sleep( 2000 );
sw.stop();
System.out.println( "elapsed: " + sw.format( sw.elapsed() ) );
System.out.println( "total: " + sw.format( sw.total() ) );
}
catch ( Exception e ) {
e.printStackTrace();
}
}
}
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