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 }