histogram.cpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25#include "precompiled.hpp"
26#include "oops/oop.inline.hpp"
27#include "utilities/histogram.hpp"
28
29#ifdef ASSERT
30
31////////////////// HistogramElement ////////////////////////
32
33HistogramElement::HistogramElement() {
34  _count = 0;
35}
36
37int HistogramElement::count() {
38  return _count;
39}
40
41const char* HistogramElement::name() {
42  return _name;
43}
44
45void HistogramElement::increment_count() {
46  // We can't use the accessor :-(.
47  Atomic::inc(&_count);
48}
49
50int HistogramElement::compare(HistogramElement* e1,HistogramElement* e2) {
51  if(e1->count() > e2->count()) {
52    return -1;
53  } else if(e1->count() < e2->count()) {
54    return 1;
55  }
56  return 0;
57}
58
59void HistogramElement::print_on(outputStream* st) const {
60  st->print("%10d   ",((HistogramElement*)this)->count());
61  st->print_cr("%s",((HistogramElement*)this)->name());
62}
63
64////////////////// Histogram ////////////////////////
65
66int Histogram::sort_helper(HistogramElement** e1, HistogramElement** e2) {
67  return (*e1)->compare(*e1,*e2);
68}
69
70Histogram::Histogram(const char* title,int estimatedCount) {
71  _title = title;
72  _elements = new (ResourceObj::C_HEAP) GrowableArray<HistogramElement*>(estimatedCount,true);
73}
74
75void Histogram::add_element(HistogramElement* element) {
76  // Note, we need to add locking !
77  elements()->append(element);
78}
79
80void Histogram::print_header(outputStream* st) {
81  st->print_cr("%s",title());
82  st->print_cr("--------------------------------------------------");
83}
84
85void Histogram::print_elements(outputStream* st) {
86  elements()->sort(Histogram::sort_helper);
87  jint total = 0;
88  for(int i=0; i < elements()->length(); i++) {
89    elements()->at(i)->print();
90    total += elements()->at(i)->count();
91  }
92  st->print("%10d   ", total);
93  st->print_cr("Total");
94}
95
96void Histogram::print_on(outputStream* st) const {
97  ((Histogram*)this)->print_header(st);
98  ((Histogram*)this)->print_elements(st);
99}
100
101#endif
102