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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  }