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/** |
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$Id$ |
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Copyright (C) 2007 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.timer; |
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/** |
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A simple timer for measuring code performance. You can register |
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one or more timers when constructing an object of this class. Typically, |
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there should be one timer for each part of the code (method call) that |
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you want to measure. |
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Use {@link #start(int)}, {@link #stop(int)} and {@link #stopStart(int, int)} |
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to start and stop the timers in your code. Example: |
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<pre class="code"> |
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PerformanceTimer timer = |
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new PerformanceTimer("method1()", "method2()"); |
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timer.start(0); |
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method1(); |
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timer.stopStart(0, 1); |
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method2(); |
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timer.stop(1); |
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System.out.println(timer.toString()); |
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</pre> |
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This classes use {@link System#nanoTime()} to get the time. All times |
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are returned as nano-second differences between the start and stop time |
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of the timer. Starting and stopping a timer multiple times adds more |
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time to the timer. Use {@link #reset(int)} to zero a timer. |
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@author nicklas |
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@version 2.4 |
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@base.modified $Date$ |
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*/ |
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public class PerformanceTimer |
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{ |
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|
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private final String[] names; |
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private final long[] timers; |
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private final boolean[] isRunning; |
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/** |
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Create a new timer object for measuring one or more times. |
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|
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@param names The name of the timers |
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*/ |
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public PerformanceTimer(String... names) |
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{ |
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this.names = names; |
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this.timers = new long[names.length]; |
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this.isRunning = new boolean[names.length]; |
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} |
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|
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/** |
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Start the timer with the given index. This method does nothing |
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if the timer is already running. |
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|
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@param index The index of the timer |
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*/ |
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public void start(int index) |
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{ |
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if (isRunning[index]) return; |
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timers[index] -= System.nanoTime(); |
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isRunning[index] = true; |
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} |
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|
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/** |
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Stop a running timer. This method does nothing if the timer |
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isn't running. |
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|
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@param index The index of the timer |
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@return The current time |
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*/ |
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public long stop(int index) |
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{ |
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if (isRunning[index]) timers[index] += System.nanoTime(); |
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isRunning[index] = false; |
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return timers[index]; |
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} |
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|
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/** |
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Start one timer and stop another. |
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@param stopIndex The timer to stop |
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@param startIndex The timer to start |
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@return The current time of the stopped timer |
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*/ |
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public long stopStart(int stopIndex, int startIndex) |
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{ |
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start(startIndex); |
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return stop(stopIndex); |
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} |
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|
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/** |
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Stop all running timers |
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*/ |
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public void stopAll() |
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{ |
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for (int i = 0; i < timers.length; ++i) |
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{ |
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stop(i); |
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} |
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} |
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|
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/** |
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Check if a timer is running or not. |
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@param index The index of the timer |
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@return TRUE if the timer is running, FALSE if it has stopped |
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*/ |
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public boolean isRunning(int index) |
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{ |
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return isRunning[index]; |
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} |
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|
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/** |
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Get the current time of a timer. |
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@param index The index of the timer |
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@return The current time of the timer |
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*/ |
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public long getTime(int index) |
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{ |
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return timers[index] + (isRunning[index] ? System.nanoTime() : 0); |
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} |
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|
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/** |
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Reset a timer. |
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@param index The timer to reset |
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*/ |
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public void reset(int index) |
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{ |
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timers[index] = isRunning[index] ? -System.nanoTime(): 0; |
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} |
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|
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/** |
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Reset all timers. |
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*/ |
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public void resetAll() |
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{ |
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for (int i = 0; i < timers.length; ++i) |
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{ |
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reset(i); |
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} |
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} |
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|
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/** |
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Print out time information about each timer. The times |
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are rounded to millisecond values. |
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*/ |
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@Override |
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public String toString() |
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{ |
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StringBuilder sb = new StringBuilder(); |
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for (int i = 0; i < timers.length; ++i) |
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{ |
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sb.append(names[i]).append("\t").append(getTime(i) / 1000000).append(" ms"); |
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if (isRunning[i]) |
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{ |
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sb.append(" (running)"); |
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} |
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sb.append("\n"); |
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} |
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return sb.toString(); |
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} |
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|
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} |