jodd.datetime.JStopWatch Maven / Gradle / Ivy
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.datetime;
import java.util.List;
import java.util.ArrayList;
/**
* Nice thread-aware stopwatch that supports time spans, cumulative times and laps.
* Useful for all kind of profiling, time measurements etc.
*/
public class JStopWatch {
/**
* Optional stopwatch name.
*/
protected String name;
/**
* Last start time.
*/
protected long startTime;
/**
* Last stop time.
*/
protected long stopTime;
/**
* Last elapsed time.
*/
protected long spanTime;
/**
* Cumulative elapsed time.
*/
protected long totalTime;
/**
* Running flag.
*/
protected boolean running;
// ---------------------------------------------------------------- ctors
/**
* Starts the stopwatch.
*/
public JStopWatch() {
this("#jStopWatch");
}
/**
* Starts the named stopwatch.
*/
public JStopWatch(String name) {
this.name = name;
start();
}
/**
* Returns stopwatch name.
*/
public String getName() {
return name;
}
/**
* Returns true if stopwatch is running.
*/
public boolean isRunning() {
return running;
}
// ---------------------------------------------------------------- basic
/**
* Starts the stopwatch. {@link #stop()} must be called prior to restart.
* Returns starting time in milliseconds.
*/
public long start() {
if (!running) {
startTime = System.currentTimeMillis();
running = true;
}
return startTime;
}
/**
* Restarts the stopwatch.
*/
public long restart() {
startTime = System.currentTimeMillis();
running = true;
return startTime;
}
/**
* Stops the stopwatch if running. Returns span time.
* If laps are used, marks the last lap.
*/
public long stop() {
if (running) {
stopTime = System.currentTimeMillis();
if (laps != null) {
lap(stopTime);
}
spanTime = stopTime - startTime;
totalTime += stopTime - startTime;
running = false;
}
return spanTime;
}
/**
* Returns total elapsed time from the {@link #start()} in ms.
*/
public long elapsed() {
return System.currentTimeMillis() - startTime;
}
/**
* Stops the stopwatch and returns total cumulative time in ms.
*/
public long total() {
stop();
return totalTime;
}
/**
* Stops the stopwatch and returns total time span for last
* start-stop sequence.
*/
public long span() {
stop();
return spanTime;
}
// ---------------------------------------------------------------- laps
/**
* List of all laps. Contains long arrays in following format:
*
* - lap time - current lap time,
* - lap span time - elapsed time from start,
* - lap millis - lap milliseconds.
*
*/
protected List laps;
/**
* Marks a lap and returns its length. May be called only while stop watch is running.
*/
public long lap() {
return lap(System.currentTimeMillis());
}
protected long lap(long lap) {
if (!running) {
return 0;
}
long lapSpanTime = lap - startTime;
long lapTime;
if (laps == null) {
lapTime = lapSpanTime;
laps = new ArrayList<>();
} else {
long[] previous = laps.get(laps.size() - 1);
lapTime = lap - previous[2];
}
laps.add(new long[] {lapTime, lapSpanTime, lap});
return lapTime;
}
/**
* Returns the total number of laps up to this moment.
*/
public int totalLaps() {
if (laps == null) {
return 0;
}
return laps.size();
}
/**
* Returns lap times for 1-based lap index.
* Returns null if laps are not used or if index is invalid.
*/
public long[] getLapTimes(int index) {
if (laps == null) {
return null;
}
if ((index <= 0) || (index > laps.size())) {
return null;
}
return laps.get(index - 1);
}
// ---------------------------------------------------------------- output
/**
* Returns total elapsed time as formatted string from the last start.
*/
@Override
public String toString() {
long elapsed = elapsed();
StringBuilder sb = new StringBuilder();
sb.append("JStopWatch ").append(name).append(running ? " is running." : "").append('\n');
if (running) {
sb.append("elapsed: ").append(formatTimeSpan(elapsed));
} else {
if (spanTime != totalTime) {
sb.append("span: ").append(formatTimeSpan(spanTime)).append('\n');
}
sb.append("\ntotal: ").append(formatTimeSpan(totalTime));
}
if (laps != null) {
if (!laps.isEmpty()) {
sb.append('\n');
sb.append("\n\t\t\tlap\t\telapsed\n");
}
for (int i = 0; i < laps.size(); i++) {
long[] longs = laps.get(i);
sb.append(" lap #").append(i + 1).append(':').append('\t');
sb.append(formatTimeSpan(longs[0])).append('\t');
sb.append(formatTimeSpan(longs[1])).append('\n');
}
}
return sb.toString();
}
/**
* Formats time spans.
*/
public static String formatTimeSpan(long millis) {
long seconds = 0;
long minutes = 0;
long hours = 0;
if (millis > 1000) {
seconds = millis / 1000;
millis %= 1000;
}
if (seconds > 60) {
minutes = seconds / 60;
seconds %= 60;
}
if (minutes > 60) {
hours = minutes / 60;
minutes %= 60;
}
StringBuilder result = new StringBuilder(20);
boolean out = false;
if (hours > 0) {
result.append(hours).append(':');
out = true;
}
if (out || (minutes > 0)) {
if (minutes < 10) {
result.append('0');
}
result.append(minutes).append(':');
}
if (seconds < 10) {
result.append('0');
}
result.append(seconds).append('.');
if (millis < 10) {
result.append('0');
}
if (millis < 100) {
result.append('0');
}
result.append(millis);
return result.toString();
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy