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, 33 * of random integers. We need to transform that array into a smaller array 34 * containing only prime numbers. The new array has to be sorted. 35 * 36 * <p> 37 * While tackling this problem, we would like to measure the 38 * time spent in each subtask. 39 * 40 * <p> 41 * A typical output for this demo would be: 42 <pre> 43 + Profiler [DEMO] 44 |-- elapsed time [RANDOM] 0.089 seconds. 45 |---+ Profiler [SORT_AND_PRUNE] 46 |-- elapsed time [SORT] 0.221 seconds. 47 |-- elapsed time [PRUNE_COMPOSITES] 11.567 seconds. 48 |-- Subtotal [SORT_AND_PRUNE] 11.788 seconds. 49 |-- elapsed time [SORT_AND_PRUNE] 11.788 seconds. 50 |-- Total [DEMO] 11.877 seconds. 51 </pre> 52 * 53 * @author Ceki Gulcu 54 */ 55 public class NestedProfilerDemo { 56 main(String[] args)57 public static void main(String[] args) { 58 // create a profiler called "DEMO" 59 Profiler profiler = new Profiler("DEMO"); 60 61 // register this profiler in the thread context's profiler registry 62 ProfilerRegistry profilerRegistry = ProfilerRegistry.getThreadContextInstance(); 63 profiler.registerWith(profilerRegistry); 64 65 // start a stopwatch called "RANDOM" 66 profiler.start("RANDOM"); 67 RandomIntegerArrayGenerator riaGenerator = new RandomIntegerArrayGenerator(); 68 int n = 10 * 1000; 69 int[] randomArray = riaGenerator.generate(n); 70 71 // create and start a nested profiler called "SORT_AND_PRUNE" 72 // By virtue of its parent-child relationship with the "DEMO" 73 // profiler, and the previous registration of the parent profiler, 74 // this nested profiler will be automatically registered 75 // with the thread context's profiler registry 76 profiler.startNested(SortAndPruneComposites.NESTED_PROFILER_NAME); 77 78 SortAndPruneComposites pruner = new SortAndPruneComposites(randomArray); 79 pruner.sortAndPruneComposites(); 80 81 // stop and print the "DEMO" printer 82 profiler.stop().print(); 83 } 84 } 85