blob: 32484c079dfaeefd6ecab859af43742685156046 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef STORAGE_LEVELDB_UTIL_HISTOGRAM_H_
#define STORAGE_LEVELDB_UTIL_HISTOGRAM_H_
#include <string>
namespace leveldb {
class Histogram {
public:
Histogram() { }
~Histogram() { }
void Clear();
void Add(double value);
void Merge(const Histogram& other);
std::string ToString() const;
private:
double min_;
double max_;
double num_;
double sum_;
double sum_squares_;
enum { kNumBuckets = 154 };
static const double kBucketLimit[kNumBuckets];
double buckets_[kNumBuckets];
double Median() const;
double Percentile(double p) const;
double Average() const;
double StandardDeviation() const;
};
}
#endif // STORAGE_LEVELDB_UTIL_HISTOGRAM_H_
|
