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      1 /**
      2  * Copyright (c) 2004-2011 QOS.ch
      3  * All rights reserved.
      4  *
      5  * Permission is hereby granted, free  of charge, to any person obtaining
      6  * a  copy  of this  software  and  associated  documentation files  (the
      7  * "Software"), to  deal in  the Software without  restriction, including
      8  * without limitation  the rights to  use, copy, modify,  merge, publish,
      9  * distribute,  sublicense, and/or sell  copies of  the Software,  and to
     10  * permit persons to whom the Software  is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The  above  copyright  notice  and  this permission  notice  shall  be
     14  * included in all copies or substantial portions of the Software.
     15  *
     16  * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
     17  * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
     18  * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
     19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21  * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
     22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  */
     25 package org.slf4j.profiler;
     26 
     27 /**
     28  *
     29  * This demo illustrates usage of SLF4J profilers.
     30  *
     31  * <p>
     32  * We have been given the task of generating a large number, say N, of random
     33  * integers. We need to transform that array into a smaller array containing
     34  * only prime numbers. The new array has to be sorted.
     35  *
     36  * <p>
     37  * While tackling this problem, we would like to measure the time spent in each
     38  * subtask.
     39  *
     40  * <p>
     41  * A typical output for this demo would be:
     42  *
     43  * <pre>
     44    + Profiler [BASIC]
     45    |-- elapsed time                      [A]   213.186 milliseconds.
     46    |-- elapsed time                      [B]  2499.107 milliseconds.
     47    |-- elapsed time                  [OTHER]  3300.752 milliseconds.
     48    |-- Total                         [BASIC]  6014.161 milliseconds.
     49   </pre>
     50  *
     51  * @author Ceki Gulcu
     52  */
     53 public class BasicProfilerDemo {
     54 
     55     public static void main(String[] args) {
     56         // create a profiler called "BASIC"
     57         Profiler profiler = new Profiler("BASIC");
     58         profiler.start("A");
     59         doA();
     60 
     61         profiler.start("B");
     62         doB();
     63 
     64         profiler.start("OTHER");
     65         doOther();
     66         profiler.stop().print();
     67     }
     68 
     69     static private void doA() {
     70         delay(200);
     71     }
     72 
     73     static private void doB() {
     74         delay(2500);
     75     }
     76 
     77     static private void doOther() {
     78         delay(3300);
     79     }
     80 
     81     static private void delay(int millis) {
     82         try {
     83             Thread.sleep(millis);
     84         } catch (InterruptedException e) {
     85         }
     86     }
     87 }
     88