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1 /*
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2 * Copyright 1998-2000 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // This class provides a framework for collecting various statistics.
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26 // The current implementation is oriented towards counting invocations
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27 // of various types, but that can be easily changed.
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28 //
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29 // To use it, you need to declare a Histogram*, and a subtype of
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30 // HistogramElement:
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31 //
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32 // HistogramElement* MyHistogram;
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33 //
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34 // class MyHistogramElement : public HistogramElement {
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35 // public:
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36 // MyHistogramElement(char* name);
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37 // };
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38 //
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39 // MyHistogramElement::MyHistogramElement(char* elementName) {
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40 // _name = elementName;
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41 //
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42 // if(MyHistogram == NULL)
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43 // MyHistogram = new Histogram("My Call Counts",100);
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44 //
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45 // MyHistogram->add_element(this);
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46 // }
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47 //
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48 // #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count()
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49 //
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50 // This gives you a simple way to count invocations of specfic functions:
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51 //
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52 // void a_function_that_is_being_counted() {
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53 // MyCountWrapper("FunctionName");
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54 // ...
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55 // }
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56 //
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57 // To print the results, invoke print() on your Histogram*.
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58
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59 #ifdef ASSERT
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60
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61 class HistogramElement : public CHeapObj {
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62 protected:
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63 jint _count;
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64 const char* _name;
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65
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66 public:
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67 HistogramElement();
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68 virtual int count();
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69 virtual const char* name();
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70 virtual void increment_count();
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71 void print_on(outputStream* st) const;
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72 virtual int compare(HistogramElement* e1,HistogramElement* e2);
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73 };
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74
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75 class Histogram : public CHeapObj {
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76 protected:
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77 GrowableArray<HistogramElement*>* _elements;
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78 GrowableArray<HistogramElement*>* elements() { return _elements; }
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79 const char* _title;
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80 const char* title() { return _title; }
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81 static int sort_helper(HistogramElement** e1,HistogramElement** e2);
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82 virtual void print_header(outputStream* st);
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83 virtual void print_elements(outputStream* st);
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84
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85 public:
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86 Histogram(const char* title,int estimatedSize);
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87 virtual void add_element(HistogramElement* element);
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88 void print_on(outputStream* st) const;
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89 };
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90
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91 #endif
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