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comparison src/share/vm/utilities/histogram.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1998-2000 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // This class provides a framework for collecting various statistics.
26 // The current implementation is oriented towards counting invocations
27 // of various types, but that can be easily changed.
28 //
29 // To use it, you need to declare a Histogram*, and a subtype of
30 // HistogramElement:
31 //
32 // HistogramElement* MyHistogram;
33 //
34 // class MyHistogramElement : public HistogramElement {
35 // public:
36 // MyHistogramElement(char* name);
37 // };
38 //
39 // MyHistogramElement::MyHistogramElement(char* elementName) {
40 // _name = elementName;
41 //
42 // if(MyHistogram == NULL)
43 // MyHistogram = new Histogram("My Call Counts",100);
44 //
45 // MyHistogram->add_element(this);
46 // }
47 //
48 // #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count()
49 //
50 // This gives you a simple way to count invocations of specfic functions:
51 //
52 // void a_function_that_is_being_counted() {
53 // MyCountWrapper("FunctionName");
54 // ...
55 // }
56 //
57 // To print the results, invoke print() on your Histogram*.
58
59 #ifdef ASSERT
60
61 class HistogramElement : public CHeapObj {
62 protected:
63 jint _count;
64 const char* _name;
65
66 public:
67 HistogramElement();
68 virtual int count();
69 virtual const char* name();
70 virtual void increment_count();
71 void print_on(outputStream* st) const;
72 virtual int compare(HistogramElement* e1,HistogramElement* e2);
73 };
74
75 class Histogram : public CHeapObj {
76 protected:
77 GrowableArray<HistogramElement*>* _elements;
78 GrowableArray<HistogramElement*>* elements() { return _elements; }
79 const char* _title;
80 const char* title() { return _title; }
81 static int sort_helper(HistogramElement** e1,HistogramElement** e2);
82 virtual void print_header(outputStream* st);
83 virtual void print_elements(outputStream* st);
84
85 public:
86 Histogram(const char* title,int estimatedSize);
87 virtual void add_element(HistogramElement* element);
88 void print_on(outputStream* st) const;
89 };
90
91 #endif